An Innovative Two-Layer Multiple-DOF Seat Suspension for Vehicle Whole Body Vibration Control

This paper describes the design, simulation, and performance evaluation of hybrid MR damper on quarter bus semi-active seat suspension coupled with human biodynamic model. Also, the whole body vibration (WBV) exposures were evaluated based on the international standard ISO 2631 (1997), and its parameters were used to measure the level of discomfort for bus drivers. The hybrid MR damper was proposed to enhance the damping force within low current supplied and achieve a fail-soft capability in case of electrical failure. The characteristics of the proposed hybrid MR damper were compared to the conventional MR damper by considering the same size, materials, and current input. The designed damper was incorporated to seat suspension system coupled with biodynamic lumped model, and the governing equations of motion of the full model were derived. Skyhook controller was used to control the amount of current to be supplied to hybrid MR damper. The controlled semi-active hybrid MR and conventional MR seat suspension are compared to uncontrolled system for two types of road excitation. The simulated results show that the driver seat comfort was improved by the skyhook controller than the uncontrolled case. The evaluated WBV showed that the hybrid MR damper can improve the driver life from fairly uncomfortable to little discomfort.

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DeepImpact: a deep learning model for whole body vibration control using impact force monitoring

Neural Computing and Applications ◽

10.1007/s00521-020-05218-6 ◽

2020 ◽

Author(s):

Danish Ali ◽

Samuel Frimpong

Keyword(s):

Deep Learning ◽

Vibration Control ◽

Impact Force ◽

Whole Body Vibration ◽

Learning Model ◽

Whole Body ◽

Body Vibration ◽

Force Monitoring ◽

Deep Learning Model

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Comparing the Whole Body Vibration Exposures across Three Truck Seats

Proceedings of the Human Factors and Ergonomics Society Annual Meeting ◽

10.1177/1541931213601214 ◽

2016 ◽

Vol 60 (1) ◽

pp. 933-936 ◽

Cited By ~ 1

Author(s):

Fangfang Wang ◽

Hugh Davies ◽

Bronson Du ◽

Peter W. Johnson

Keyword(s):

Whole Body Vibration ◽

Truck Drivers ◽

Whole Body ◽

Body Vibration ◽

Seat Suspension ◽

Performance Differences ◽

Air Suspension ◽

Vibration Action ◽

Practical Implications

Studies have shown that there are differences in whole body vibration (WBV) exposures and WBV attenuation performance among different suppliers of air suspension truck seats. With 17 truck drivers operating semi-trucks over two common road types (the same highways and dirt roads), WBV exposures were measured and compared across three different air-suspension truck seats. Similar to a previous study, in the higher-speed, on-road highway conditions, one seat was found to have higher WBV exposures and lower WBV attenuation performance. In off-road conditions at slower speed, there were negligible differences across the three seats. These differences in seat performance have important practical implications. The higher performing seats nearly doubled the amount of time drivers could operate their trucks before reaching the ISO daily vibration action limits from 3 to 6 hours a day to 9 to 11 hours a day. Seat suspension-based design differences are thought to account for the performance differences.

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Monitoring and Evaluation of Whole-Body Vibration Exposure of Equipment Operators and Assessment of Associated Health Risk in an Indian Underground Pb-Zn Mine

Current World Environment ◽

10.12944/cwe.13.3.13 ◽

2018 ◽

Vol 13 (3) ◽

pp. 403-415

Author(s):

BIBHUTI BHUSHAN MANDAL ◽

SHIVKUMAR SHRINARAYAN PRAJAPATI ◽

SYED AFTAB HUSSAIN ◽

RAHUL ANUP MISHRA

Keyword(s):

Health Risk ◽

Whole Body Vibration ◽

Mining Industry ◽

Monitoring And Evaluation ◽

Whole Body ◽

Vibration Exposure ◽

Body Vibration ◽

Seat Suspension ◽

Low Profile ◽

Dump Trucks

Exposure to whole-body vibration (1-80 Hz) manifest in higher incidences of low back pain and other musculoskeletal disorders among the workforce in mining industry. The aim of the study was to determine the vibration intensity of twelve mining equipments which are regularly deployed in an underground mine and to evaluate the long term health risk of their operators as per ISO 2631-1:1997 guidelines. It was observed that the low profile dump trucks (LPDT) and load haul dumpers (LHD) had x axis (front-back) as dominant axis of vibration. The operators of LPDTs and LHDs had moderate health risk considering frequency weighted root mean square (r.m.s.) acceleration values of vibration (0.46 – 1.01 m/s2) and corresponding daily exposure of about 6 hours in a shift. Operators of three equipments i.e. water sprinkler, utility vehicle and backfill material carrier had high health risk with z (vertical) as dominant axis of vibration. RMS acceleration values were comparatively high (1.30- 1.96 m/s2) even though their duration of exposure was less (2.5-5.0 hours). Motor grader operator had minimal health risk from vibration exposure while rest two operators of explosive and personnel carrier had moderate health risk. Additional assessment of health risk was carried out using total vibration dose values wherever applicable. High health risks were attributed to fast and harsh driving, poor seat condition and absence of independent seat suspension. Besides technical and operational modifications, training programs should be organised to improve the awareness of this hazard among miners in India.

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