Noise and Vibration Risk Assessment for the Operators of Crawler Loaders

During work, earth-moving machines generate significant levels of noise and vibration that can be harmful for the operators; therefore the analysis of the noise and vibration conditions at the driving position is of great importance for the risk assessment. Compact loaders have become a pressing challenge as they are extremely hazardous referring to noise and vibration emissions, especially in their crawler version where further relevant noise and vibration are generated by the hard contact between track belt and ground. This paper reports the results of investigations carried out on three crawler compact loaders in different operating conditions. The main purpose was to investigate the noise and vibration values transmitted to the operators in some working conditions and use these data to obtain reliable estimates of the exposure to noise, to whole-body and to hand-arm transmitted vibrations, as well as to evaluate the related risk levels. Vibration signals transmitted to the operator were acquired on the seat and the machine control lever in accordance with the procedures specified in ISO 2631-1 and ISO 5349-1. At the same time, noise signals were acquired at the operator’s ear following the procedure reported in ISO 11201. Vibration signals were also acquired on the cabin floor with the main purpose to evaluate the effectiveness of the machine seats in reducing the vibration transmission. Finally, the noise and vibration exposure risks were evaluated on the basis of the health and safety requirements established in 2003/10/EC and 2002/44/EC Directives.

[1]  T. Nilsson,et al.  International consensus criteria for diagnosing and staging hand–arm vibration syndrome , 2018, International Archives of Occupational and Environmental Health.

[2]  A. Dudarewicz,et al.  Noise induced hearing loss: research in Central, Eastern and South-Eastern Europe and Newly Independent States. , 2013, Noise and Health.

[3]  William J. Pielemeier,et al.  The use of seat effective amplitude transmissibility (SEAT) values to predict dynamic seat comfort , 2003 .

[4]  S. Harsha,et al.  Effects of posture and vibration magnitude on seat to head transmissibility during exposure to fore-and-aft vibration , 2018 .

[5]  Angela Calvo,et al.  Whole-body vibration: Measurement of horizontal and vertical transmissibility of an agricultural tractor seat , 2017 .

[6]  Michael J. Griffin.  Evaluation of Vibration with Respect to Human Response , 1986 .

[7]  Setsuo Maeda,et al.  Subjective ratings of whole-body vibration for single- and multi-axis motion. , 2011, The Journal of the Acoustical Society of America.

[8]  Massimo Bovenzi,et al.  An Updated Review of Epidemiologic Studies on the Relationship Between Exposure to Whole-Body Vibration and Low Back Pain , 1998 .

[9]  C L Zimmermann,et al.  Effects of vibration frequency and postural changes on human responses to seated whole-body vibration exposure , 1997, International archives of occupational and environmental health.

[10]  David J. Edwards,et al.  Variation between manufacturers’ declared vibration emission values and those measured under simulated workplace conditions for a range of hand-held power tools typically found in the construction industry , 2008 .

[11]  Jørgen Skotte,et al.  Stress reactions to cognitively demanding tasks and open-plan office noise , 2009, International archives of occupational and environmental health.

[12]  K. Torén,et al.  Longitudinal study of occupational noise exposure and joint effects with job strain and risk for coronary heart disease and stroke in Swedish men , 2018, BMJ Open.

[13]  Chi-Ting Horng,et al.  Effects of Horizontal Acceleration on Human Visual Acuity and Stereopsis , 2015, International journal of environmental research and public health.

[14]  Thomas M. Cook,et al.  WORK-RELATED MUSCULOSKELETAL SYMPTOMS AND INJURIES AMONG OPERATING ENGINEERS : A REVIEW AND GUIDELINES FOR IMPROVEMENT , 1997 .

[15]  Pedro Arezes,et al.  The influence of operator driving characteristics in whole-body vibration exposure from electrical fork-lift trucks , 2009 .

[16]  Gregory Neely,et al.  Stress, subjective experience and cognitive performance during exposure to noise and vibration , 2007 .

[17]  E. Shoja,et al.  The effect of whole body vibration (WBV) on discomfort, heart rate and reaction time in men 20 to 30 years , 2018 .

[18]  M J Griffin,et al.  Effects of fore-and-aft, lateral and vertical whole-body vibration on a head-positioning task. , 1997, Aviation, space, and environmental medicine.

[19]  Yu Zheng,et al.  Health impacts of construction noise on workers: A quantitative assessment model based on exposure measurement , 2016 .

[20]  A. Suter.  Development of Standards and Regulations for Occupational Noise , 2008 .

[21]  M Martínez-Aires,et al.  Analysis of whole-body vibrations transmitted by earth moving machinery , 2017 .

[22]  M. Bovenzi,et al.  An updated review of epidemiologic studies on the relationship between exposure to whole-body vibration and low back pain (1986–1997) , 1999, International archives of occupational and environmental health.

[23]  Eiichi Yasuda,et al.  Ride Comfort Evaluation of Horizontal Vibration in Tractor-Trailer Considering Human Body Motion of Driver , 2013 .

[24]  Warwick Williams,et al.  The epidemiology of noise exposure in the Australian workforce. , 2013, Noise & health.

[25]  A P Vanerkar,et al.  Whole body vibration exposure in heavy earth moving machinery operators of metalliferrous mines , 2008, Environmental monitoring and assessment.

[26]  M Bovenzi,et al.  A prospective cohort study of exposure-response relationship for vibration-induced white finger , 2009, Occupational and Environmental Medicine.

[27]  Neil J Mansfield,et al.  Earth moving machine whole-body vibration and the contribution of Sub-1Hz components to ISO 2631-1 metrics. , 2009, Industrial health.

[28]  Francesca Pedrielli,et al.  Tri-axial evaluation of the vibration transmitted to the operators of crawler compact loaders , 2018, International Journal of Industrial Ergonomics.

[29]  Yoshiyuki Matsuoka,et al.  An investigation into a synthetic vibration model for humans:: An investigation into a mechanical vibration human model constructed according to the relations between the physical, psychological and physiological reactions of humans exposed to vibration , 2001 .