Search results

Filters

  • Journals
  • Authors
  • Keywords
  • Date
  • Type

Search results

Number of results: 13
items per page: 25 50 75
Sort by:
Download PDF Download RIS Download Bibtex

Abstract

The on-going economic transformation of the Moscow market towards the provision of services and trade requires the revitalisation of many districts. The case study — the Dominion Tower building — shows that solutions in the field of architecture and urban planning of buildings whose construction can be categorised as local architectural intervention into existing urban structure may be decisive in the success of an undertaking aimed at activating urban tissue within the interference area.
Go to article

Authors and Affiliations

Wojciech Duliński
1

  1. Cracow University of Technology, Faculty of Architecture, Institute of Architectural Design
Download PDF Download RIS Download Bibtex

Abstract

Water resources are the main component of natural systems affected by climate change in the Middle East. Due to a lack of water, steam power plants that use wet cooling towers have inevitably reduced their output power. This article investigates the replacement of wet cooling towers in Isfahan Thermal Power Plant (ITPP) with Heller natural dry draft cooling towers. The thermodynamic cycle of ITPP is simulated and the effect of condenser temperature on efficiency and output power of ITPP is evaluated. For various reasons, the possibility of installing the Heller tower without increasing in condenser temperature and without changing the existing components of the power plant was rejected. The results show an increase in the condenser temperature by removing the last row blades of the low-pressure turbine. However, by replacing the cooling tower without removing the blades of the last row of the turbine, the output power and efficiency of the power plant have decreased about 12.4 MW and 1.68 percent, respectively.
Go to article

Bibliography

[1] B. Dziegielewski and D. Baumann. Tapping alternatives: The benefits of managing urban water demands. Environment: Science and Policy for Sustainable Development, 34(9):6–41, 2010. doi: 10.1080/00139157.1992.9930929.
[2] D. Marmer. Water conservation equals energy conservation. Energy Engineering, 115(5):48–63, 2018. doi: 10.1080/01998595.2018.12027708.
[3] J.M. Burns, D.C. Burns, and J.S. Burns. Retrofitting cooling towers: estimates required to achieve the next level of CWA 316(b) compliance. In Proceedings of the ASME Power Conference, pages 25–33, 2004. doi: 10.1115/POWER2004-52051.
[4] A. Loew, P. Jaramillo, and H. Zhai. Marginal costs of water savings from cooling system retrofits: a case study for Texas power plants. Environmental Research Letters, 11(10):104004, 2016. doi: 10.1088/1748-9326/11/10/104004.
[5] A.E. Conradie and D.G. Kröger. Performance evaluation of dry-cooling systems for power plant applications. Applied Thermal Engineering, 16(3):219–232, 1996. doi: 10.1016/1359-4311(95)00068-2.
[6] A.E. Conradie, J.D. Buys, and D.G. Kröger. Performance optimization of dry-cooling systems for power plants through SQP methods. Applied Thermal Engineering, 18(1-2):25–45, 1998. doi: 10.1016/S1359-4311(97)00020-3.
[7] J.D. Buys and D.G. Kröger. Dimensioning heat exchangers for existing dry cooling towers. Energy Conversion and Management, 29(1):63–71, 1989. doi: 10.1016/0196-8904(89)90014-9.
[8] Z. Zou, Z. Guan, H. Gurgenci, and Y. Lu. Solar enhanced natural draft dry cooling tower for geothermal power applications. Solar Energy, 86(9):2686–2694, 2012. doi: 10.1016/j.solener.2012.06.003.
[9] S. Bagheri and M. Nikkhoo. Investigation of the optimum location for adding two extra Heller-type cooling towers in Shazand power plant. Proceedings of the 17th IAHR International Conference on Cooling Tower and Heat, pages. 74–83, Australia, 2015.
[10] W. Peng and O.K. Sadaghiani. Presentation of an integrated cooling system for enhancement of cooling capability in Heller cooling tower with thermodynamic analyses and optimization. International Journal of Refrigeration, 131:786–802, 2021. doi: 10.1016/j.ijrefrig.2021.07.016.
[11] M.A. Ardekani, F. Farhani, and M. Mazidi. Effects of cross wind conditions on efficiency of Heller dry cooling tower. Experimental Heat Transfer, 28(4):344–353, 2015. doi: 10.1080/08916152.2014.883449.
[12] A. Jahangiri, A. Borzooee, and E. Armoudli. Thermal performance improvement of the three aligned natural draft dry cooling towers by wind breaking walls and flue gas injection under different crosswind conditions. International Journal of Thermal Sciences, 137:288–298, 2019. doi: 10.1016/j.ijthermalsci.2018.11.028.
[13] A.R. Seifi, O.A. Akbari, A.A. Alrashed, F. Afshari, G.A.S. Shabani, R. Seifi, M. Goodarzi, and F. Pourfattah. Effects of external wind breakers of Heller dry cooling system in power plants. Applied Thermal Engineering, 129: 1124–1134, 2018. doi: 10.1016/j.applthermaleng.2017.10.118.
[14] R.A. Kheneslu, A. Jahangiri, and M. Ameri. Interaction effects of natural draft dry cooling tower (NDDCT) performance and 4E (energy, exergy, economic and environmental) analysis of steam power plant under different climatic conditions. Sustainable Energy Technologies and Assessments, 37:100599, 2020. doi: 10.1016/j.seta.2019.100599.
[15] A. Jahangiri and F. Rahmani. Power production limitations due to the environmental effects on the thermal effectiveness of NDDCT in an operating powerplant. Applied Thermal Engineering, 141:444–455, 2018. doi: 10.1016/j.applthermaleng.2018.05.108.
[16] A.D. Samani. Combined cycle power plant with indirect dry cooling tower forecasting using artificial neural network. Decision Science Letters, 7:131–142, 2018. doi: 10.5267/j.dsl.2017.6.004.
[17] T.L. Bergman, F.P. Incropera, D.P. DeWitt, and A.S. Lavine. Fundamentals of Heat and Mass Transfer. John Wiley & Sons, 2011.
[18] Archive of Isfahan Mohammad Montazeri Power Station. Isfahan, Iran, 1984.
[19] H. Ahmadikia and G. Iravani. Numerical and analytical study of natural dry cooling tower in a steam power plant. Journal of Advanced Materials in Engineering (Esteghlal), 26(1):183–195, 2007. (in Persian).
[20] H.G. Zavaragh, M.A. Ceviz, and M.T.S. Tabar. Analysis of windbreaker combinations on steam power plant natural draft dry cooling towers. Applied Thermal Engineering, 99:550–559, 2016. doi: 10.1016/j.applthermaleng.2016.01.103.
[21] K.F. Reinschmidt and R. Narayanan. The optimum shape of cooling towers. Computers & Structures, 5(5-6):321–325, 1975. doi: 10.1016/0045-7949(75)90039-5.
[22] Isfahan Thermal Power Plant documents, No. C.583 and C.749, Islam Abad Power Plant, Isfahan, Iran, 1988.
[23] I.H. Shames. Mechanics of Fluids. 4th ed. McGraw-Hill, New York, 2003.
[24] C.R.F. Azevedo and A. Sinátora. Erosion-fatigue of steam turbine blades. Engineering Failure Analysis, 16(2):2290–2303, 2009. doi: 10.1016/j.engfailanal.2009.03.007.
[25] H. Kim. Crack evaluation of the fourth stage blade in a low-pressure steam turbine. Engineering Failure Analysis, 18(3):907–913, 2011. doi: 10.1016/j.engfailanal.2010.11.004.
[26] L.K. Bhagi, P. Gupta, and V. Rastogi. Fractographic investigations of the failure of L-1 pressure steam turbine blade. Case Studies in Engineering Failure Analysis, 1(2):72–78, 2013. doi: 10.1016/j.csefa.2013.04.007.
Go to article

Authors and Affiliations

Mohamad Hasan Malekmohamadi
1 2
Hossein Ahmadikia
1
ORCID: ORCID
Siavash Golmohamadi
2
Hamed Khodadadi
3

  1. University of Isfahan, Isfahan, Iran
  2. Isfahan Thermal Power Plant, Isfahan, Iran
  3. Department of Electrical Engineering, Khomeinishahr Branch, Islamic Azad University, Isfahan, Iran
Download PDF Download RIS Download Bibtex

Abstract

Optimization plays an important role in scientific and engineering research. This paper presents the effects of using the catenoidal shape to design the structure of a chimney cooling tower. The paper compares some geometrical variations of the catenoid with the reference existing hyperboloidal structure. It also compares internal forces, deformation and stability of the catenoidal structure. The comparison shows some predominance of the catenoid over the popular hyperboloid structure of the shell. The paper attempts to find an optimal shape of the cooling tower in order to reduce the amount of material and labor. The paper utilizes engineering tools and the designing process for chimney cooling towers.
Go to article

Authors and Affiliations

Maciej Wiśniowski
1
ORCID: ORCID
Robert Walentyński
1
ORCID: ORCID
Dawid Cornik
1
ORCID: ORCID

  1. Faculty of Civil Engineering, Department of Mechanics and Bridges, ul. Akademicka 5, 44-100 Gliwice, Poland
Download PDF Download RIS Download Bibtex

Abstract

The octagonal tower of the ruined castle Ojców (southern Poland) is considered one of the most impressive foundations of king Kasimir III the Great (†1370). The purpose of this paper is to discuss the results of archaeological dig carried out in 2016 and to combine it with written evidence to form the basis for the reconstruction of its long-gone past. The tower is an octagon in plan, has 11.55 m in diameter and has walls that are ca. 2.7-2.8 m thick. On the inside it is round, 6.2 m in diameter. It was built of carefully processed hewn limestone set in lime mortar and what is important to note, it is the only known castle tower realisation of king Kasimir which was built on such blocks. On the other hand, the raw material used for building the tower has close affinities with church foundations of the king (e.g. in the collegiate church in Wiślica).

Noteworthy, the fieldwork of 2016 provided rich assemblage of architectural details, including stylistically homogenous window or portal framings with characteristic pear-shaped mouldings and hollow-chamferred profiles, which likely relate to the earliest stages of the castle, perhaps already to the realisation of king Kasimir. There is a high degree of confidence that these elements were originally placed in the tower, and, if so, they determined rich and representative design of the whole structure.

According to the author of the paper, there are strong indications that the impressive octagonal tower which is distinguished among the other contemporary defensive realisations by its building material, size and, possibly, a decor, was built as a commemorative realisation, given to honour the memory of the father of king Kasimir – Władysław the Elbow-high, who according to the local tradition, early in the 14th c. found a refuge in a cave located nearby (note the castle’s name: Oczecz − further Ojców − in Polish means Father).

Last but not least, the archaeological dig brought to light the remains of an undefined building from the late 15th-mid 16th c. west from the tower, the remains of post-medieval (17th c.?) wall adjacent to the tower from the north, and some important stratigraphic observations, which allow to state that the octagonal structure witnessed some extensive restoration work in the second half of the 15th c.

Go to article

Authors and Affiliations

Michał Wojenka
Download PDF Download RIS Download Bibtex

Abstract

The overall acoustic echo of a submarine is greatly dependent on the conning tower. For enhancing the acoustic stealth performance of a submarine, it is necessary to research an innovative design scheme of the conning tower to reduce its target strength (TS). The aim of this work is to reduce the TS of a conning tower by varying its geometry and streamlining. The accuracy in modelling the acoustic scattering of a conning tower using the Kirchhoff approximation (KA) was validated, compared with finite element analysis (FEA). Several angular conning tower geometries were designed to analyze the effect of streamlining and the number of lateral facets on TS using the KA method. In consideration of the actual situation, the acoustic effect of backing medium was analyzed by compared water-filled elastic hulls with rigid hulls. From the observed TS calculation results, it is shown that the non-streamlined four lateral-facet conning tower geometries are optimal for acoustic stealth performance during the range of incidence angles from −10X to 10X, whereas the streamlined versions have better performance at incidence angles beyond this range. Furthermore, elastic hulls and rigid hulls provide similar spatial distribution regularities in monostatic configuration with the rigidity affecting the magnitude of the TS.
Go to article

Authors and Affiliations

Lin-Jiang Han
1
Hao Song
2
Chang-Xiong Chen
1
Xi-Rui Peng
3
Zi-Long Peng
1

  1. Jiangsu University of Science and Technology, Zhenjiang 212100, China
  2. Systems Engineering Research Institute, Beijing 100036, China
  3. China Ship Development and Design Center, Wuhan 430064, China
Download PDF Download RIS Download Bibtex

Abstract

The tower at Lublin Castle, known as the donjon, is the only monument of Romanesque art on the eastern side of the Vistula River. The cylindrical, brick building is part of the Lublin Castle complex. During contemporary restoration work, the 13th-century walls were uncovered, making it possible to retrieve the original materials. The article presents the mineralogical, chemical and granulometric characteristics. The analytical methodology included: qualitative mineralogical analysis of the whole sample by X-ray diffraction (XRD); morphological studies with elemental evaluation and microanalysis of the binder by scanning electron microscopy and energy-dispersive X-ray spectroscopy (SEM-EDS). Residue determination of hydrochloric acid-insoluble parts and their granulometric analysis were performed. This methodology enabled to determine the composition of the mortars. It was found that the tested mortars have a similar mineralogical structure, but slightly differ in the proportion of individual components, primarily aggregate fractions. The samples consist mainly of quartz, calcite, and silicates. Moreover, the lime binder of the mortars was shown to be microcrystalline in nature. The aggregate used in historical mortars predominantly consisted of quartz sand and minerals of the feldspar and silicate group. The condition of the mortars requires conservation interventions. The performed characterization of the historic mortars was important for designing compatible restoration mortars.
Go to article

Authors and Affiliations

Beata Klimek
1
ORCID: ORCID

  1. Lublin University of Technology, Faculty of Civil Engineering and Architecture, Department of Conservation and Built Heritage, Nadbystrzycka St. 40, 20-618 Lublin, Poland
Download PDF Download RIS Download Bibtex

Abstract

This paper analyzes the effect of additional masses for lattice structures on the nature of changes in the natural frequencies of the structure. An attempt to mathematically describe this nature and the scale of the effect with a known thickness of the icing layer was also made. The discussion concerns a structure with a sacred purpose – the Gate of the Third Millennium, located in the Lednickie Fields, in the Kiszkowo Municipality, Gniezno Poviat. The icing of structural bars (frost, rime) is treated as a source of additional masses, although the origin of non-structural mass is of secondary importance for the analysis in question. The analysis was carried out by Finite Element Method (FEM) modeling of the structure, assuming a single-parameter variation of its mass (that is, the additional mass of all elements of the test object varies proportionally to a single parameter, which is the outer surface of the element on which the ice layer is deposited). By solving the vibration eigenproblem for successive models, representing different intensities of icing of the object, the values of successive frequencies and descriptions of the corresponding eigenmodes were determined. The results obtained allow us to formulate a postulate that the possibility of a change in the mass of the analyzed object resulting from icing or other causes should be taken into account in strength analyses, wherein the dynamic properties of the structure play an important role, such as in assessing the susceptibility of the structure to dynamic loads.
Go to article

Authors and Affiliations

Wiesław Kowalski
1
ORCID: ORCID
Mateusz Richter
1
ORCID: ORCID
Katarzyna Tokarczyk
1
ORCID: ORCID

  1. University of Agriculture in Krakow, Department of Rural Building, Al. Mickiewicza 24/28, 59-130 Krakow, Poland
Download PDF Download RIS Download Bibtex

Abstract

In 2019, a 15th-century print entitled The Tower of Wisdom kept by the Kórnik Library in Poland was subjected to scientific examination. The main purpose of the examination of the hand-coloured image was the identification of the technique of the application of the text and the illustrations. The conducted examination proved a thesis that it is an example of xylographic print. Moreover, the elemental composition of the paint layer was analysed, revealing no colours which were not used in the period of the object’s origin.
Go to article

Authors and Affiliations

Tomasz Kozielec
1
ORCID: ORCID
Mirosław Wachowiak
2

  1. Wydział Sztuk Pięknych UMK
  2. Zakład Konserwacji i Restauracji Sztuki Nowoczesnej UMK
Download PDF Download RIS Download Bibtex

Abstract

Lightning is one of the causes of transmission disorders and natural phenomena that cannot be avoided. The South Sulawesi region is located close to the equator and has a high lightning density. This condition results in lightning susceptibility of disturbances to electrical system lines, especially in high-voltage airlines and substations. An Adaptive Neuro-Fuzzy Inference System (ANFIS) will show the Root Mean Square Error (RMSE) based on the membership function type. This journal is to predict the value of the transmission tower lightning density using the ANFIS method. The value of the lightning strike density index can later be determined based on ANFIS predictions. Analysis of the value calculation system of structural lightning strikes in the South Sulawesi region of the Sungguminasa-Tallasa route can be categorized as three characteristics lightning density (Nd). The calculation system results for the value of structural lightning struck in the South Sulawesi region and validated between manual calculations and ANFIS with an average percentage of 0.0554%.
Go to article

Bibliography

[1] Utomo B.T., Nappu M.B., Said S.M., Arief A., The Placement of the Transmission Lightning Arrester (TLA) at 150 kV Network using Fuzzy Logic, in 2018 10th International Conference on Information Technology and Electrical Engineering (ICITEE), pp. 347–352 (2018).
[2] Rawi I.M., Kadir M.Z.A.A., Azis N., Lightning study and experience on the first 500kV transmission line arrester in Malaysia, in 2014 International Conference on Lightning Protection (ICLP), pp. 1106–1109 (2014), DOI: 10.1109/ICLP.2014.6973289.
[3] Gassing, Analisis Sistem Proteksi Petir (Lighting Performance) Pada Sutt 150 kV Sistem Sulawesi Selatan, vol. 6, pp. 978–979 (2012).
[4] Apriyadi M., Manjang S., Nappu M.B., Tegangan Impuls Dan Arus Transien Jaringan Transmisi 150 kV Sinjai-Bone Akibat Sambaran Petir Menggunakan ATPDraw, Jurnal Sains dan Teknologi, vol. 3, no. 2, pp. 156–164 (2014).
[5] Lembang N., Manjang S., Kitta I., Efek Penurunan Tahanan Pembumian Tower 150 kV terhadap Sistem Penyaluran Petir, J. Penelit. Enj., vol. 21, no. 2, pp. 7–15 (2017).
[6] Islam M.Z., Rashed M.R., Yusuf M.S.U., ATP-EMTP modeling and performance test of different type lightning arrester on 132kv overhead transmission tower, in 2017 3rd International Conference on Electrical Information and Communication Technology (EICT), pp. 1–6 (2017).
[7] Houari K., Hartani T., Remini B., Lefkir A., Abda L., Heddam S., A hybrid model for modelling the salinity of the Tafna River in Algeria, J. Water L. Dev., vol. 40, no. 1, pp. 127–135 (2019).
[8] Gubán M., Kása R., Takács D., Avornicului M., Trends of using artificial intelligence in measuring innovation potential, Manag. Prod. Eng. Rev., vol. 10 (2019).
[9] Jang J.S.R., MATLAB: Fuzzy logic toolbox user’s guide: Version 1 (1997).
[10] Said S.M., Latief S., Determination Of Sensorless Input Parameters Of Solar Panel With Adaptive Neuro-Fuzzy Inference System (Anfis) Methods, Indonesia (2018).
[11] Marsudi D., Operasi Sistem Tenaga Listrik (2006).
[12] Ishii M. et al., Multistory transmission tower model for lightning surge analysis, IEEE Trans. Power Deliv., vol. 6, no. 3, pp. 1327–1335 (1991).
[13] Ito T., Ueda T., Watanabe H., Funabashi T., Ametani A., Lightning flashovers on 77-kV systems: observed voltage bias effects and analysis, IEEE Trans. Power Deliv., vol. 18, no. 2, pp. 545–550 (2003).
[14] Correia M.T., Festas J., Milheiras H., FelizardoN., Fernadez M., Sousa J., Methodologies for evaluating the lightning performance of transmission lines, ICOLIM (1998).
[15] Oktaviani W.A., Hati I.P., Efektifitas Perlindungan Kawat Tanah Jaringan SUTM 20 kV Gardu Induk Boom Baru Palembang, PROtek J. Ilm. Tek. Elektro, vol. 6, no. 2, pp. 90–95 (2019).
[16] Nugroho A., Syakur A., Penentuan Lokasi Pemasangan Lightning Masts Pada Menara Transmisi Untuk Mengurangi Kegagalan Perlindungan Akibat Sambaran Petir, Transmisi, vol. 7, no. 1, pp. 31–36 (2005).
[17] Simon R., Geetha A., Comparison on the performance of Induction motor control using fuzzy and ANFIS controllers, in 2013 IEEE International Conference ON Emerging Trends in Computing, Communication and Nanotechnology (ICECCN), pp. 491–495 (2013).
[18] Lincy L.M., Senthil K.R., Comparison Analysis of Fuzzy Logic and ANFIS Controller for Mitigation of Harmonics, Proc. 4th Int. Conf. Electr. Energy Syst. ICEES 2018, pp. 578–583 (2018).
[19] Rahman M.M.A., Rahim A., Performance evaluation of ANN and ANFIS based wind speed sensorless MPPT controller, in 2016 5th International Conference on Informatics, Electronics and Vision (ICIEV), pp. 542–546 (2016).
[20] Ali M., Nurohmah H., Raikhani A., Sopian H., Sutantra N., Combined ANFIS method with FA, PSO, and ICA as Steering Control Optimization on Electric Car, in 2018 Electrical Power, Electronics, Communications, Controls and Informatics Seminar (EECCIS), pp. 299–304 (2018).
[21] Aniserowicz K., Analytical calculations of surges caused by direct lightning strike to underground intrusion detection system, Bull. Polish Acad. Sci. Tech. Sci., vol. 67, no. 2 (2019).
Go to article

Authors and Affiliations

Sri Mawar Said
1
Muhammad Bachtiar Nappu
1
Andarini Asri
2
Bayu Tri Utomo
1

  1. Hasanuddin University, Indonesia
  2. Ujung Pandang State Polytechnic, Indonesia
Download PDF Download RIS Download Bibtex

Abstract

The paper presents a method of determining the efficiency of the slewing drive system applied in tower cranes. An algorithm for the proper selection of a permanent magnet synchronous motor (PMSM) for crane applications is presented. In the first stage of our research the proper PMSM was proposed on the basis of the simulation calculation. Next, the PM motor was examined on a special test bench. The experimental setup allows determining major electrical and mechanical parameters of the motor drive system. The applied slewing system consists of: an inverter, gear, cable drum and a permanent magnet motor. The performance and efficiency of the system were experimentally determined. Selected results of the experimental measurement are presented and discussed.
Go to article

Bibliography

[1] Gansen A.U., Chokkalingam L.N., Self-start synchronous reluctance motor new rotor designs and its performance characteristic, International Transaction on Electrical Energy Systems, vol. 29, no. 11, pp. 1–22 (2019).
[2] Resa J., Cortes D., Marquez-Rubio J.F., Navarro D., Reduction of induction motor energy consumption via variable velocity and flux references, Electronics, vol. 8, no. 740, pp. 1–14 (2019).
[3] Belmans R., Bisschots F., Trimmer R., Practical design considerations for braking problems in overhead crane drives, Annual Meetings of IEEE Industry Applications Society – IAS, vol. 1, pp. 473–479 (1993).
[4] Baranski M., FE analysis of coupled electromagnetic-thermal phenomena in the squirrel cage motor working at hight ambient temperature, COMPEL, vol. 38, no. 4, pp. 1120–1132 (2019).
[5] Kometani H., Sakabe S., Nakanishi K., 3-D electro-magnetic analyses of a cage induction motor with rotor skew, IEEE Transactions on Energy Conversion, vol. 11, no. 2, pp. 331–337 (1996).
[6] Torrent M., Perat J.I., Jimenez J.A., Permanent magnet synchronous motor with different rotor structures for traction motor in high speed trains, Energies, vol. 11, no. 1549, pp. 1–17 (2018).
[7] Knypinski Ł., Nowak L., Demenko A., Optimization of the synchronous motor with hybrid permanent magnet excitation system, COMPEL, 2015, vol. 34, no. 2, pp. 448–455 (2015).
[8] Zawilak T., Influence of rotor’s cage resistance on demagnetization process in the line start permanent magnet synchronous motor, Archives of Electrical Engineering, vol. 69, no. 2, pp. 249–258 (2020).
[9] Knypinski Ł., Pawełoszek K., Le Manech Y., Optimization of low-power line-start PM motor using gray wolf metaheuristic algorithm, Energies, vol. 13, no. 5, pp. 1–11 (2020).
[10] Dorell D.G., Popescu M., Evans L., Staton D.A., Knight A.M., Comparison of the permanent magnet drive motor with a cage induction motor design for a hybrid electric vehicle, Proceedings of International Power Electronics Conference – ICCE ASIA, pp. 1–6 (2010), DOI: 10.1109/IPEC.2010.5543566.
[11] Baranski M., Szel˛agW., Łyskawinski W., An analysis of a start-up process in LSPMSMs with aluminum and copper rotor bars considering the coupling of electromagnetic and thermal phenomena, Archives of Electrical Engineering, vol. 68, no. 4, pp. 933–946 (2019).
[12] Slusarek B., Kapelski D., Antal L., Zalas P., Gwozdziewicz M., Synchronous motor with hybrid permanent magnets on the rotor, Sensors, vol. 14, pp. 12425–12436 (2014).
[13] Jedryczka C., Szel˛ag W., Piech J., Multiphase permanent magnet synchronous motors with fractional slot windings, COMPEL, vol. 35, no. 6, pp. 1937–1948 (2016).
[14] Wardach M., Pałka R., Paplicki P., Bronisławski M., Novel hybrid excited machine with flux barriers in rotor structure, COMPEL, vol. 37, no. 4, pp. 1489–1499 (2018).
[15] Młynarek P., Łukaniszyn M., Jagiełła M., Kowol M., Modelling of heat transfer in low-power IPM synchronous motors, IET Science, Measurement and Technology, vol. 12, no. 8, pp. 1066–1073 (2018).
[16] Rebelo J.M., Silvestre M.A.R., Development of a coreless permanent magnet synchronous motor for a battery electric shell eco marathon prototype vehicle, Open Engineering, vol. 8, no. 1, pp. 382–390 (2018).
[17] Knypinski Ł., Krupinski J., The energy conversion efficiency in the trolley travelling drive system in tower cranes, Proceedings of 15-th Selected Issue of Electrical Engineering and Electronics – WZEE, pp. 1–4 (2020), DOI: 10.1109/WZEE48932.2019.8979940.
[18] Egrov A., Kozlow K., Belogusev V., Method for evaluation of the chain derive efficiency, Journal of Applied Engineering Science, vol. 341, pp. 277–282 (2015).
[19] Janaszek M., The analysis of the influence unequal parameters of motors on the work of multimotors traction drive, Journal of the Electrical Engineering Institute (in Polish), vol. 286, pp. 1–26 (2015).
[20] Dambrauskas K., Vanagas J., Zimnickas T., Kalvaitisand A., Ažubalis K., A method for efficiency determination of permanent magnet synchronous motor, Energies, vol. 13, no. 1004, pp. 1–15 (2020).
[21] Knypinski Ł., Krupinski J., Application of the permanent magnet synchronous motors for tower cranes, Przegląd Elektrotechniczny, vol. 96, no. 1, pp. 27–30 (2020), DOI: 10.15199/48.2020.01.07.
[22] Geng S., Zhang Y., Qiu H., Yang R., Yi R., Influence of harmonic voltage coupling on torque ripple of permanent magnet synchronous motor, Archives of Electrical Engineering, vol. 68, no. 2, pp. 399–410 (2019).
[23] Dong S., Zhang Q., Ma H., Wang R., Design for the interior permanent magnet synchronous motor drive system based on the Z-source inverter, Energies, vol. 12, no. 3350, pp. 1–14 (2019).
[24] Chen Z., Zhang H., Tu W., Luo G., Manoharan D., Kennel R., Sensorless control for permanent magnet synchronous motor in rail transient applications using segmented synchronous modulation, IEEE Access, vol. 7, pp. 76669–7667 (2019).
[25] Putz Ł., Bednarek K., Kasprzyk L., Analysis of higher harmonics generated by LED lamps, Przegląd Elektrotechniczny, vol. 96, no. 4, pp. 90–93 (2020).
[26] https://www.krupinskicranes.com, accessed July 2020.
Go to article

Authors and Affiliations

Łukasz Knypiński
1
ORCID: ORCID
Jacek Krupiński
2

  1. Poznan University of Technology, Poland
  2. Krupinski Cranes, Poland
Download PDF Download RIS Download Bibtex

Abstract

This paper compares the measurement results of dynamic characteristics, including natural frequencies, damping ratio, and wind-induced responses of the Stuttgart TV Tower (TV Tower), obtained by Lenk in 1959 using classical instruments with those obtained by the authors a few decades later using Global Positioning System (GPS). The objective of this paper was to monitor the response of the TV Tower under wind loading, which is an important tool for the validation of its design, construction, and structural health. During the authors’ GPS measurements, weak and moderate wind speeds occurred most of the time. Only in 2007, the stronger wind observed (90 < V < 100 km/h) at the head of the TV Tower (H=157 m), which caused displacements in the decimetre range. Further measurements in 2011 were carried out, using additional GPS receivers with a higher data rate. The results achieved by the GPS prove that the cross-wind response was larger than the along-wind component for all ranges of wind speed, which occurred during the measurement periods, i.e. from 2002 to 2015. The authors of this paper extended Lenk’s results, by the static and along-wind components, confirmed the first natural frequency, and damping ratio, evaluated by the Random Decrement technique. Mounting a GPS receiver, on the steel antenna mast tip, enabled detection of the second natural frequency fs2 = 0.800 Hz, which is the frequency of the mode shape of the TV Tower steel antenna mast. Lenk did not measure this frequency.
Go to article

Authors and Affiliations

Peter Breuer
1
Tadeusz Chmielewski
2
Piotr Górski
2

  1. University of Applied Sciences, Schellingstrasse 24, 70174 Stuttgart, Germany
  2. Opole University of Technology, Faculty of Civil Engineering and Architecture, Katowicka 48, 45-061 Opole, Poland
Download PDF Download RIS Download Bibtex

Abstract

The cable force of a cable-stayed bridge plays a vital role in its internal force state. Different cable forces on both sides of the main tower make the force characteristics of the polygonal-line tower quite different from those of the straight-line tower. Therefore, the determination of the cable force of the polygonal-line tower cable-stayed bridge is a crucial aspect of any evaluation of its mechanical characteristics. A single-cable plane prestressed concrete broken-line tower cable-stayed bridge is taken as a case study to conduct a model test and theoretical cable force determination. The reasonable cable force of the bridge is determined by the minimum bending energy method combined with false load and internal force balance methods. analysis includes a comparison between cable force calculation results, model test results, and the design value of the actual bridge. The distribution law of the dead load cable force of the completed bridge is determined accordingly.
Go to article

Bibliography


[1] E. Atashpaz-Gargari, C. Lucas. „Imperialist competitive algorithm: an algorithm for optimization inspired by imperialistic competition”. [J] Proceedings of 2007 IEEE Congress on Evolutionary Computation. Singapore: IEEE, 2007: pp. 4661–4667.
[2] A. Kaveh, S. Talatahari. “Optimum design of skeletal structures using imperialist competitive algorithm”. [J] Computers and Structures, 2010, 88: pp. 1220–1229.
[3] M. M. Hassana, A. O. Nassef, E. Damatty. “Determination of optimum post-tensioning cable forces of cable-stayed bridges”. [J] Engineering Structures, 2012(1): pp. 248–259.
[4] Z. J. Chen, Y. Liu, L. F. Yang. “Optimization of Stay Cable Tension of Completed Bridge of Single-Pylon Cable-Stayed Bridge Based on Particle Swarm Optimization Algorithm”. [J] Bridge Construction, 2016 46(3): pp. 40–44.
[5] S. Q. Qin, Z Y Gao. „Developments and Prospects of Long-Span High-Speed Railway Bridge Technologies in China”. [J] Engineering, 2017, 3(6): pp. 787–794.
[6] J. L. Wang, L He. “A Prestressing Tendon Element Geoenvironmental Engineering”, 2013, 139(8): pp. 1262–1274.
[7] T. Carey, B. Mason, A. R. Barbosa, et al. “Modeling Framework for Soil-bridge System Response during Sequential Earthquake and Tsunami Loading”. [C] Tenth US National Conference on Earthquake Engineering, Anchorage [s.n.], 2014.
[8] H. Tao, X. F. Shen. “Strongly subfeasible sequential quadratic programming method of cable tension optimization for cable-stayed bridges”. [J] Chinese Journal of Theoretical and Applied Mechanics, 2006, 38(3): pp. 381–384. (in Chinese)
[9] X. H. Zhou, P. Dai, D. Jin. “Optimization analysis of cable tensions of dead load state for cable-stayed bridge with steel box girder” [J] Journal of Architecture and Civil Engineering, 2007, 24(2): pp. 19–23. (in Chinese)
[10] A. Baldomir, S. Hernandez, F. Nieto, et al. “Cable optimization of along span cable stayed bridge in La Coruña (Spain)”. [J]. Advances in Engineering Software, 2010,41: pp. 931–938.
[11] A. M. B. Martins, L. M. C. Simoes, J. H. J. O. Negrao. “Optimization of cable forces on concrete cable-stayed bridges including geometrical nonlinearities”. [J] Computers and Structures, 2015, 155: pp. 18–27.
[12] M. M. Hassan, A. A. EI Damatty, A. O. Nassef. “Database for the optimum design of semi-fan composite cable-stayed bridges based on genetic algorithms”. [J] Structure and Infrastructure Engineering, 2014, 11(8): pp. 1054–1068.
[13] X. Wu, R. C. Xiao. “Optimization of cable force for cable-stayed bridges with mixed stiffening girders based on genetic algorithm”. [J] Journal of Jiangsu University (Natural Science Edition), 2014, 35(6): 2016, 12(2): pp. 208–222.
[14] Y. C. Sung, C. Y. Wang, E. H. Teo. “Application of particle swarm optimisation to construction planning of cable-stayed bridges by the cantilever erection method”. [J] Structure and Infrastructure Engineering, 2016, 12(2): pp. 208–222.
[15] B. S. Smith. “The Single a Palne Cable-stayed Girder Bridge: a Method of Analysis Suitable for Computer Use”. [J] Civil engineering,1967,37(5): pp.183–194.
[16] Y. Xi; J. S. Kuang. “Ultimate Load Capacity of Cable-stayed Bridge”. Joural of Bridge Engineering [J]. 1999, 4(1): pp. 14–22.
[17] C. Honigmann, D. Billington. “Conceptual Design for the Sunniberg Bridge” [J] Joural of bridge enginerring, 2003, 8(3): pp. 122–130.
[18] R. Karoumi. “Some modelling aspects in the nonlinear finite element analysis of cable supported bridges”. [J] Computers& Structures, 1999, 71(4): pp. 397–412.
[19] Q. S. Chen, W. L. Huang, M G Yang, “Analysis of shear lag effect in construction stage of wide box girder extradosed cable-stayed bridge with large flanges”, Journal of Railway Science and Engineering, vol. 15, no. 12, pp. 3158–3164, 2018.
[20] X. Guo, Y. K. Wu, Y. Guo. “Time-dependent Seismic Fragility Analysis of Bridge Systems under Scour Hazard and Earthquake Loads”. [J] Engineering Structures, 2016, 121: pp. 52–60.
[21] M. M. Chuiaramonte, P. Arduino, D. E. Lehman, et al. “Seismic Analyses of Conventional and Improved Marginal Wharves”. [J] Earthquake Engineering & Structural Dynamics, 2013, 42(10): pp. 1435–1450.
[22] A. E. Haiderali, G. Madabhushi. “Evaluation of Curve Fitting Techniques in Deriving P-Y Curves for Laterally Loaded Piles”. [J] Geotechnical and Geological Engineering, 2016, 34(5): pp. 1453–1473.
[23] M. H. Faber, S. Engelund, R. Rackwitz. “Aspects of parallel wire cable reliability”. [J] Strucural Safety, 2003, 25(2): pp. 201–225.
[24] C. M. Lan, N. N. Bai, H. T. Yang, et al. “Weibull modeling of the fatigue life for steel rebar considering corrosion effects”. [J] International Journal of Fatigue, 2018, 111: pp. 134–143.
[25] C. M. Lan, Y. Xu, C. P. Liu, et al. “Fatigue life prediction for parallel-wire stay cables considering corrosion effects”. [J] International Journal of Fatigue, 2018, 114: pp. 81–91.
[26] M. Bruneau. “Evaluation of system-reliability methods for cable-stayed bridge design”. [J] Journal of Structural Engineering, 1992, 118(4): pp. 1106–1120.
[27] Y. Liu, N. W. Lu, X. F. Yin, et al. “An adaptive support vector regression method for structural system reliability assessment and its application to a cable-stayed bridge”. [J] Proceedings of the Institution of Mechanical Engineers, Part O: Journal of Risk and Reliability, 2016, 230(2): pp. 204–219.
[28] V. Lute, A. Upadhyay, K. K. Singh. “Computationally efficient analysis of cable-stayed bridge for GA-based optimization”. [J] Engineering Applications of Artificial Intelligence, 2009, 22: pp. 750–758.
Go to article

Authors and Affiliations

Yanfeng Li
1
ORCID: ORCID
Tianyu Guo
1
ORCID: ORCID
Longsheng Bao
1
ORCID: ORCID
Fuchun Wang
1

  1. School of Transportation Engineering, Shenyang Jianzhu University, Shenyang 110168, China

This page uses 'cookies'. Learn more