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Effect of psychoacoustic annoyance on EEG signals of tractor drivers

Majid Lashgari Mohammad Reza Arab Mohsen Nadjafi Rafiee Mojtaba

Archives of Acoustics | 2022 | vol. 47 | No 4 | 469-477 | DOI: 10.24425/aoa.2022.142899

Keywords EEG Higuchi fractal tractor sound

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Abstract

The purpose of this study was to evaluate the psychoacoustic annoyance (PA) that the tractor drivers are exposed to, and investigate its effects on their brain signals during their work activities. To this aim, the sound of a garden tractor was recorded. Each driver’s electroencephalogram (EEG) was then recorded at five different engine speeds. The Higuchi method was used to calculate the fractal dimension of the brain signals. To evaluate the amount of acoustic annoyance that the tractor drivers were exposed to, a psychoacoustic annoyance (PA) model was used. The results showed that as the engine speed increased, the values of PA increased as well. The results also indicated that an increase in the Higuchi’s fractal dimension (HFD) of alpha and beta bands was due to the increase of the engine speed. The regression results also revealed that there was a high correlation between the HFD of fast wave activities and PA, in that, the coefficients of determination were 0.92 and 0.91 for alpha and beta bands, respectively. Hence, a good correlation between the EEG signals and PA can be used to develop a mathematical model which quantifies the human brain response to the external stimuli.

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Authors and Affiliations

Majid Lashgari

Mohammad Reza Arab

Mohsen Nadjafi

Rafiee Mojtaba

Department of Biosystems Engineering, Arak University Arak, Iran
Department of Medical Engineering, Arak University of Medical Sciences Arak, Iran
Department of Electrical Engineering, Arak University of Technology Arak, Iran

Impact of tractor wheels on physical properties of different soil types and the irrigation efficiency of the furrow irrigation method

Rahim Bux Vistro Mashooque Ali Talpur Irfan Ahmed Shaikh Munir Ahmed Mangrio

Journal of Water and Land Development | 2022 | No 52 | 166-171 | DOI: 10.24425/jwld.2022.140386

Keywords furrow/ridge storage efficiency irrigation method soil physical properties tractor wheel trafficking water use efficiency

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Abstract

In furrow irrigation, the maximum lateral movement of water in ridges is more desirable than the vertical downward movement. This can be achieved by compacting the furrows. Thus, the study examines the impact on furrow soil compaction by tractor wheel trafficking during mechanical operations in the different soil types. In this experiment, the three-wheel tractor compaction includes: 1) control (no soil compaction), 2) compaction through 3-wheel tractor passes, and 3) compaction through 6-wheel passes under three different soil textural classes such as: clay loam, silty clay loam and silty loam soils. The impact of various treatments on clay loam, silty clay loam, and silty loam under 3- and 6-wheel passes showed increased bulk density (7–12%), field capacity (9–19%), ridge storage efficiency (35–38%), water use efficiency (16–20.5%) and decreased soil porosity (7–16%), infiltration (8–20%), and furrow storage efficiency (28–41%) over the control. This study shows comparable results of 6-passes with other studies in which more than 6-passes were used to compact the soil. This study suggested that farmers can maximise water use efficiency by compacting their furrows using 6-passes tractor trafficking.

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Bibliography

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Authors and Affiliations

Rahim Bux Vistro

Mashooque Ali Talpur

Irfan Ahmed Shaikh

Munir Ahmed Mangrio

Sindh Agriculture University, Faculty of Agricultural Engineering, Tandojam, Hyderabad, 70060, Sindh, Pakistan

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Effect of psychoacoustic annoyance on EEG signals of tractor drivers

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Impact of tractor wheels on physical properties of different soil types and the irrigation efficiency of the furrow irrigation method

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Bibliography

Authors and Affiliations