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State-of-the-art rotordynamic analyses of pumps

Frédéric Gaulard Joachim Schmied Andreas Fuchs
Bulletin of the Polish Academy of Sciences Technical Sciences | 2021 | 69 | 6 | e139316 | DOI: 10.24425/bpasts.2021.139316
Keywords rotordynamics lateral analysis pumps fluid-film bearings pump seals nonlinear analysis
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Abstract

State-of-the-art analyses for the rotordynamic assessment of pumps and specific requirements for the simulation tools are described. Examples are a horizontal multistage pump with two fluid film bearings in atmospheric pressure, a horizontal submerged multistage pump with many bearings, and a submerged vertical single-stage pump with water-lubricated bearings. The rotor of the horizontal pump on two bearings is statically overdetermined by the seals and the static bearing forces depend on the deflection in the seals and the bearings. The nonlinear force-displacement relation in the bearings is considered in this paper. The stability of pumps is assessed by Campbell diagrams considering linear seal and bearing properties. Cylindrical bearings can have a destabilizing effect in the case of low loads as in the examples of the submerged pumps. For the pump with many bearings, the influence of the bearing ambient pressure and the bearing specific load on the stability is analyzed. For the vertical pump, the limit cycle, i.e. the vibration level of stabilization, is determined with a nonlinear analysis. All examples have a practical background from engineering work, although they do not exactly correspond to real cases. Analyses were performed with the rotordynamic software MADYN 2000.
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Bibliography

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Authors and Affiliations

Frédéric Gaulard
1
Joachim Schmied
1
Andreas Fuchs
1
  1. Delta JS AG, Technoparkstrasse 1, 8005 Zürich, Switzerland

Numerical benchmarks for topology optimization of structures with stress constraints

Grzegorz Fiuk Mirosław W. Mrzygłód
Bulletin of the Polish Academy of Sciences Technical Sciences | 2021 | 69 | 6 | e139317 | DOI: 10.24425/bpasts.2021.139317
Keywords topology benchmarks stress constraints topology optimization additive manufacturing
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Abstract

Modern industry requires an increasing level of efficiency in a lightweight design. To achieve these objectives, easy-to-apply numerical tests can help in finding the best method of topological optimization for practical industrial applications. In this paper, several numerical benchmarks are proposed. The numerical benchmarks facilitate qualitative comparison with analytical examples and quantitative comparison with the presented numerical solutions. Moreover, an example of a comparison of two optimization algorithms was performed. That was a commonly used SIMP algorithm and a new version of the CCSA hybrid algorithm of topology optimization. The numerical benchmarks were done for stress constraints and a few material models used in additive manufacturing.
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Bibliography

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Authors and Affiliations

Grzegorz Fiuk
1
ORCID: ORCID
Mirosław W. Mrzygłód
1
ORCID: ORCID
  1. Opole University of Technology, Faculty of Mechanical Engineering, ul. Mikołajczyka 5, 45-271 Opole, Poland

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