Experimental analysis of occupational whole-body vibration exposure of agricultural tractor with large square baler

Langer, Thomas; Ebbesen, Morten Kjeld; Kordestani, Ario

doi:10.1016/j.ergon.2015.02.009

Cited by 55 publications

(24 citation statements)

References 21 publications

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“…Recent research has questioned whether the RMS method underestimates vibration effects on human health (Zhao and Schindler, 2014). Also, vibration exposures can change dramatically over the course of time due to environmental factors, ground conditions, vehicle maintenance, and work environment changes such as relocation of pits and dump sites (Langer et al, 2015; Smets et al, 2010). Two days of vibration measurements may not be characteristic of a “typical” day and it is still possible that drivers were overexposed to vibration at some point in their career.…”

Section: Discussionmentioning

confidence: 99%

The effect of vibration exposure during haul truck operation on grip strength, touch sensation, and balance

Pollard

Porter

Mayton

et al. 2017

International Journal of Industrial Ergonomics

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Falls from mobile equipment are reported at surface mine quarry operations each year in considerable numbers. Research shows that a preponderance of falls occur while getting on/off mobile equipment. Contributing factors to the risk of falls include the usage of ladders, exiting onto a slippery surface, and foot or hand slippage. Balance issues may also contribute to fall risks for mobile equipment operators who are exposed to whole-body vibration (WBV). For this reason, the National Institute for Occupational Safety and Health, Office of Mine Safety and Health Research conducted a study at four participating mine sites with seven haul truck operators. The purpose was to ascertain whether WBV and hand-arm vibration (HAV) exposures for quarry haul truck operators were linked to short-term decreases in performance in relation to postural stability, touch sensation threshold, and grip strength that are of crucial importance when getting on/off the trucks. WBV measures of frequency-weighted RMS accelerations (wRMS) and vibration dose value (VDV), when compared to the ISO/ANSI standards, were mostly below levels identified for the Health Guidance Caution Zone (HGCZ), although there were instances where the levels were within and above the specified Exposure Action Value. Comparably, all mean HAV levels, when compared to the ISO/ANSI standards, were below the HGCZ. For the existing conditions and equipment, no significant correlation could be identified between the WBV, HAV, postural stability, touch sensation threshold, and grip strength measures taken during this study.

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Section: Discussionmentioning

confidence: 99%

The effect of vibration exposure during haul truck operation on grip strength, touch sensation, and balance

Pollard

Porter

Mayton

et al. 2017

International Journal of Industrial Ergonomics

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show abstract

“…When the crawler is walking, the working parts on the chassis execute the picking and compression of the straw. Langer et al investigated the whole-body vibration exposure of agricultural tractor with large square baler [15]. Li et al established the inertial force and rotation balance model of the baler rotary cutting feed device and derived the unbalanced excitation force caused by the unbalance of the rotary cutting feed rotor and the free vibration equation of the device [16].…”

Section: Introductionmentioning

confidence: 99%

Inertial Vibration Characteristics of Track Chassis Caused by Reciprocating Motion of Crank Slider

Tang

Liu

Zhou

et al. 2019

Shock and Vibration

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The crank slider of self-propelled baling machinery is used for straw compression on the crawler chassis structure. During the reciprocating motion of the crank slider, the inertia of the piston will cause a greater shock to baling machinery. In this paper, the inertia of the crank slider piston was analyzed on crawler chassis. The model and parameter values of the inertia force balance of the crank slider were established by the complete balance method. The test mode was used to analyze the natural mode and mode shape of the piston. The vertical vibration amplitudes of the crawler chassis beam were tested and used to reflect the specific inertial vibration characteristics of the self-propelled baling machinery caused by the reciprocating motion of the piston. The inertial vibration caused by the reciprocating motion of the crank slider was eliminated by the method of weighting the tail of the track beam. Results indicated that the self-balancing counterweight of the crank slider was 261.82 kg. The six natural modal frequencies of the piston were 4.62, 17.26, 29.82, 63.85, 83.73, and 141.58 Hz, respectively. During the reciprocating motion of the piston, the first-order frequency of the piston would be excited by feeding auger excitation frequency of 3.77 Hz and may cause resonance. And, the vertical vibrates of track beam was based on the measuring point 6 as a fulcrum. Adding a counterweight of 265 kg at the end of the track chassis would completely eliminate the self-propelled baling machinery inertial vibration caused by the reciprocating motion of the crank slider.

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“…The position of the seat and the type of backrest play an important role but other factors such as the condition of soil [16], the vehicle speed [17], the driving style, the vehicle characteristics, and operative conditions also generate relevant consequences [18]. In the use of particular vehicles like tractors, WBV is dependent upon the nature of the operation performed [19] and it is influenced by the use of four-wheel drive [20], by the eccentricity of the tire that changes the amplitude of the solicitation [21], speed conditions, and structural characteristics [22]. Similar problems were observed among bus drivers, [23] whereas the drivers of loaders and dumpers are exposed to a relevant dose of WBV because of the vibrations associated with the operations of loading and hauling [24], with the use of tires with chains and with terrain type [25].…”

Section: Introductionmentioning

confidence: 99%

Risk assessment of the whole-body vibration exposure for drivers of armored vehicles: A case study

Degan¹,

Coltrinari²,

Lippiello³

et al. 2016

Int. J. SAFE

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It is widely recognized in the field of safety at workplace that professional exposure to whole-body vibration (WBV) may generate unfavorable effects on workers' health. Among many involved categories, professional drivers are clearly one of the most exposed groups, as exposure time may last for the whole working period. This research is based on the results of measurements gathered from 14 subjects who drove vehicles for urban use. In particular, in order to highlight the effects of vehicle armoring on professional WBV dose, two sampling campaigns were carried out. In the first case, a car for standard use was used while, in the second one, another vehicle of the same model was modified with the installation of the armor-plate for ballistic protection. The assessment was carried out in accordance with ISO 2631-1(97), under the same boundary conditions, and finally the daily exposure parameter was assessed. Furthermore, to allow a comparison independent of individual factors, the exposed subjects were divided into homogeneous groups of different classes based on their body weight and height. The results obtained showed that WBV exposure is clearly connected with vehicle characteristics. In particular, the installation of bulletproof armor, contributing to a change in the car mass distribution and its total weight, determines a generalized reduction of professional dose. This reduction may be quantified in a range from 10% to 20% depending on the individual characteristics of the driver.

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Experimental analysis of occupational whole-body vibration exposure of agricultural tractor with large square baler

Cited by 55 publications

References 21 publications

The effect of vibration exposure during haul truck operation on grip strength, touch sensation, and balance

The effect of vibration exposure during haul truck operation on grip strength, touch sensation, and balance

Inertial Vibration Characteristics of Track Chassis Caused by Reciprocating Motion of Crank Slider

Risk assessment of the whole-body vibration exposure for drivers of armored vehicles: A case study

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