scholarly journals Whole Body Vibration Exposure during Rotary Soil Tillage Operation:

2018 ◽  
Vol 15 (4) ◽  
pp. 5927-5940 ◽  
Author(s):  
Amandeep Singh ◽  
Naser Nawayseh ◽  
Lakhwinder Pal Singh ◽  
Sarbjit Singh ◽  
Harwinder Singh
Keyword(s):  
Average Velocity ◽  
Soil Tillage ◽  
Whole Body ◽  
Average Error ◽  
Vibration Exposure ◽  
Desirability Approach ◽  
Tillage Operation ◽  
Actual Field ◽  
Iso 2631 ◽  
Fft Analysis

The present investigation attempted to study the overall daily vibration exposure A(8) in actual field rotary tillage operation at various ride conditions (i.e. average velocity, draft and average soil tillage depth). Three different levels of each ride condition were chosen to formulate an organised design of experiments by using Taguchi’s approach. The concurrent root mean square (RMS) acceleration values were measured at the tractor platform, seat pan and seat backrest along the three translation axes to determine the A(8). Signal-to-noise ratios (SNRs) were computed and analysed concerning the conducted experiments. Further, the dominant frequencies at each set of experiment were determined by fast fourier transform (FFT) analysis. A linear regression model was developed to predict the output response and further, the ride conditions were optimised by using desirability approach. The overall daily vibration exposure was found between fairly uncomfortable to uncomfortable category (i.e. 0.64 and 0.84 m/s2) as per ISO 2631-1 (1997). Moreover, the exposure levels are beyond the exposure action limit recommended by Directive2002/44/EU. The average velocity and draft effects on the A(8) response were found significant (p≤0.05) with a contribution of 78.38% and 18.54%, respectively. The FFT analysis depicted a range of dominant peaks in the frequency range of 0.8 to 3.7 Hz. However, the exact frequency of the peaks was found to depend on the experimental condition. The prediction model indicates a good correlation between predicted and actual experimental response with an average error of 1.02%. Desirability and Taguchi’s approaches gave identical optimised ride conditions (i.e. 0.6 m/s, 6 kN, and 0.14 m) with the aim of reducing the A(8) value.

Whole-body vibration exposure experienced by motorcycle riders – An evaluation according to ISO 2631-1 and ISO 2631-5 standards

2009 ◽  
Vol 39 (5) ◽  
pp. 708-718 ◽  
Author(s):  
Hsieh-Ching Chen ◽  
Wei-Chyuan Chen ◽  
Yung-Ping Liu ◽  
Chih-Yong Chen ◽  
Yi-Tsong Pan
Keyword(s):  
Whole Body Vibration ◽  
Whole Body ◽  
Vibration Exposure ◽  
Body Vibration ◽  
Iso 2631

Some important oversights in the assessment of whole-body vibration exposure based on ISO-2631-1

2012 ◽  
Vol 43 (1) ◽  
pp. 268-269 ◽  
Author(s):  
Ren G. Dong ◽  
Daniel E. Welcome ◽  
Thomas W. McDowell
Keyword(s):  
Whole Body Vibration ◽  
Whole Body ◽  
Vibration Exposure ◽  
Body Vibration ◽  
Iso 2631

scholarly journals WHOLE BODY AND HAND-ARM VIBRATIONS ON OFF-ROAD VEHICLE USED IN ACADEMICALS COMPETITIONS

2017 ◽  
Vol 24 (5) ◽  
pp. 375-382
Author(s):  
Fábio Celso Oliveira ◽  
Geice Paula Villibor ◽  
Joseph Kalil Khoury Junior ◽  
Éder Harisson Ferreira Lima
Keyword(s):  
Whole Body Vibration ◽  
Whole Body ◽  
Vibration Exposure ◽  
Military Operations ◽  
Road Vehicles ◽  
Body Vibration ◽  
Acceleration Level ◽  
Vertical Accelerations ◽  
Warning Limits ◽  
Iso 2631

Off-road vehicles, baja type, are designed for locomotion on irregular terrains with several obstacles, to pull loads with effciency, furthermore, are compact and easy to operate. Such vehicles have wide use in agriculture, construction, transportation and military operations. Baja vehicle provide to pilot an exposure to high levels of mechanical vibrations. With the present work aimed to determine the whole body vibration and hand-arm vibration in the pilot using the vehicle designed by UFVbaja team. The vibrations levels incident on the pilot was measured in three different terrain conditions and different forward speeds. It was determinate the root mean square acceleration and daily vibration exposure at the seat pad and hand-arm of pilot. For whole body vibration was obtained the daily vibration dose value. The values were confronted with standards ISO 2631-1. The acceleration level, normalized to 8 hour, exceeded the warning limits for all worked conditions. To Baja vehicle operating in plowing soil, the transverse and vertical accelerations exceeded the limit level. In general, incident acceleration levels on the pilot were considered high, which reinforces the need for seats projects of suspension, steering and seat that effectively reduce the vibration transmitted to pilot body and hand-arm system.

Influence of Speed in Whole Body Vibration Exposure in Heavy Equipment Mining Vehicles

2016 ◽  
Vol 60 (1) ◽  
pp. 919-922 ◽  
Author(s):  
Luz S. Marin ◽  
Andrés Rodriguez ◽  
Estefany Rey ◽  
Lope H. Barrero ◽  
Jack Dennerlein ◽  
...  
Keyword(s):  
Whole Body Vibration ◽  
Cross Sectional Study ◽  
Whole Body ◽  
Daily Maximum ◽  
Vibration Exposure ◽  
Cross Sectional ◽  
Body Vibration ◽  
Heavy Equipment ◽  
Vector Sum ◽  
Iso 2631

This study aimed to characterize and contrast the ISO 2631-1 daily average-continuous A(8) and cumulative-impulsive VDV(8) whole body vibration (WBV) exposures during the operation of mining heavy equipment vehicles (HEVs). In a cross-sectional study, WBV measurements were collected from six different types of HEVs. For each HEV, the daily A(8) and VDV(8) WBV exposures were determined for each axis (x, y and z) along with the vector sum (∑xyx).. The predominant axis of vibration exposure was related to and dependent on the type of HEV, which all have different average speeds. Most of the predominant axis WBV exposures were above the ISO daily vibration action limits and the vector sum-based WBV exposures were considerably higher. Our results indicated that mining HEV operators are exposed to high levels of both continuous and impulsive WBV exposures, with the impulsive WBV exposures being more restrictive with respect the HEVs daily maximum operation hours.

scholarly journals Particular aspects regarding the effects of whole body vibration exposure

2018 ◽  
Vol 148 ◽  
pp. 09005 ◽  
Author(s):  
Mihaela Picu ◽  
Laurentiu Picu
Keyword(s):  
Complex System ◽  
Human Performance ◽  
Whole Body Vibration ◽  
Whole Body ◽  
Vibration Exposure ◽  
Vibration Level ◽  
Body Vibration ◽  
Vertical Vibrations ◽  
Iso 2631 ◽  
Whole Body Vibrations

This paper analyses the influence of whole-body vibrations on human performance; for this it was investigated how a group of men (20-29 years of age) and a group of woman (21–31 years of age) answered to specific requirements after being subjected to vertical vibrations under controlled laboratory conditions for 10-25 min. The vibrations were generated by a vibrant system with known amplitudes and frequencies. Accelerations were measured with NetdB - complex system for measuring and analysing human vibration and they were found in the range 0.4 - 3.1m/s2. The subjects’ performances were determined for each vibration level using specific tests. It can be concluded that exposure to vibrations higher than those recommended by ISO 2631 significantly disrupts how subjects responded to tests requirements.

scholarly journals Evaluation and Analysis of Whole-Body Vibration Exposure during Soil Tillage Operation

Safety ◽  
2021 ◽  
Vol 7 (3) ◽  
pp. 61
Author(s):  
Amandeep Singh ◽  
Siby Samuel ◽  
Harwinder Singh ◽  
Yash Kumar ◽  
Chander Prakash
Keyword(s):  
Ride Comfort ◽  
Whole Body Vibration ◽  
Soil Tillage ◽  
Whole Body ◽  
Real Field ◽  
Vibration Exposure ◽  
Low Frequencies ◽  
Average Speed ◽  
Body Vibration ◽  
Experimental Trials

This study investigated whole-body vibration (WBV) response in real field harrowing operations at different tractor ride conditions i.e., average speed, front harrow pin angle (FHPA), and rear harrow pin distance (RHPD). Taguchi’s L27 orthogonal array was used to formulate a systematic design of experiments. WBV exposure was measured along the three translational axes to compute overall daily vibration magnitude i.e., A(8). Tractor’s seat isolation capacity was assessed in terms of Seat Effective Amplitude Transmissibility i.e., SEAT%. Raw acceleration data was analysed to obtain dominant frequencies using Fast Fourier Transform (FFT). A(8) was found to range between 0.43 to 0.87 m/s2 in the experimental trials. Seat isolation capacity was found to be poor in 89% of the experiments i.e., SEAT% > 100%. Average speed and FHPA was found to have a significant impact (p ≤ 0.05) on A(8) and SEAT%. FFT response showed a range of primary and secondary dominant peaks within a frequency range of 0.2 to 11 Hz. In conclusion, the majority of experimental trials (67%) exceeded the Directive2002/44EU recommended exposure action value (EAV) limit i.e., 0.5 m/s2. The harrowing operation was found to exhibit vibration exposure at low frequencies in the vicinity of natural frequencies of the human body and may consequently affect ride comfort.

Measures of vibration exposure for a high-speed craft crew

2011 ◽  
Vol 225 (4) ◽  
pp. 338-349 ◽  
Author(s):  
K Garme ◽  
L Burström ◽  
J Kuttenkeuler
Keyword(s):  
High Speed ◽  
Whole Body ◽  
Vibration Exposure ◽  
Short Term ◽  
Transient Vibration ◽  
Static Compression ◽  
Acceleration Signal ◽  
Exposure Data ◽  
Iso 2631

The paper compares measurement-based measures for human vibration exposure. Data were collected during sea trials on a 10 m, 50 kn coastguard craft equipped with a three-axial accelerometer at the coxswain seat and with vertically mounted gauges measuring the acceleration of the cockpit floor. The ISO 2631-1:1997 measures of vibration (namely the root-mean-square (r.m.s.) value of the whole-body vibration (determined from the frequency-weighted acceleration signal), the maximum transient vibration value (MTVV), and the vibration dose value), the ISO 2631-5:2004 measure (namely the daily equivalent static compression dose Sed), and also statistically based measures to evaluate the acceleration magnitude are compared and discussed with respect to their ability to identify the mitigating effect of the suspension seat and how the different measures rank the severity of the high-speed craft (HSC) ride. The paper concludes that the r.m.s. value and the MTVV are unsuitable for evaluation of the conditions aboard while the other investigated measures show potential in this respect. Further the approach of ISO 2631-5:2004 taking both the short-term and the long-term perspectives on the human exposure to vibration is concluded to be the most mature method well suited to evaluation of HSC conditions.

Calculating a Worker'S Health Risk for Back Disorders due to Vibration

2000 ◽  
Vol 44 (30) ◽  
pp. 5-613-5-613
Author(s):  
Judy Village ◽  
Murray Lott
Keyword(s):  
European Economic Community ◽  
Whole Body Vibration ◽  
Whole Body ◽  
Vibration Exposure ◽  
Economic Community ◽  
Disc Protrusion ◽  
Council Directive ◽  
Exposure Levels ◽  
Iso 2631 ◽  
Detailed Work

A detailed work and medical history was used to calculate whole-body vibration exposure and total vibration dose for a worker appealing a back injury claim. Comparison was made with 3 standards: ISO 2631 (versions from 1978 to 1997); European Economic Community Council Directive; and the German Federal Ministry of Labour. The worker's exposure levels exceeded all standards often by two-fold or more. Total vibration dose (9137) exceeds the suggested by a factor of 6.5-fold. It is concluded this worker's 15-year vibration exposure accelerated the onset, if not caused the L4–5 disc protrusion.

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