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The IUP Journal of Mechanical Engineering

Biodynamic Response of Human Subjects Exposed to Whole Body Vibration in Forging

Article Details

Pub. Date	: August, 2021
Product Name	: The IUP Journal of Mechanical Engineering
Product Type	: Article
Product Code	: IJME40821
Author Name	: Kamaljeet Bhambri, Ishbir Singh, Harwinder Singh and Tejeet Singh
Availability	: YES
Subject/Domain	: Engineering
Download Format	: PDF Format
No. of Pages	: 13

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Abstract

The paper presents the details of investigation of the Whole Body Vibration (WBV) among drop forging subjects. An input parameter of 1440 rpm was considered for conducting drawing operation to record the Vibration Dose Value (VDV) along x-axis, y-axis and z-axis. The values indicate that the average value of 20.11 ± 2.13 ms-1.75 and the 8-hour equivalent vibration exposure [A(8) response] were beyond the ISO: 2631-1 (1997) recommended values. The study found that dominant frequencies for 7-12 Hz and for 8-10 Hz would cause discomfort for different parts of human body because of existing natural frequencies of human body. The results show that these dominant frequencies could cause discomfort, chest and abdomen pain and muscle disorder among subjects. It is concluded that the subjects required better environment in order to overcome WBV exposure.

Introduction

Drop forging hammers are used in manufacturing a variety of material shape and size such as aeroplane, car and truck, and can manufacture precision components of complex shaped and different thickness with good quality. The industrial workers have to work long duration during their daily work assigned task as per daily shift (8-12 hours). The Whole Body Vibration (WBV) exposure among forging workers is beyond the recommended limits of the average vibration levels measured over a standard working day of eight hours (A (8)) of ISO: 2631-1997 (0.5 m/s2). The high magnitude of vibration exposure causes Musculoskeletal Disorders (MSD) and spinal injury. The vibration exposure depends on the types of job, material of job and thickness of job. There were no setups to which exposure may reduce and amplify the vibration. Occasionally, the forging subjects were exposed to WBV above the ISO-specified standards.