THE ALLOWABLE LIMIT OF VIBRATION

Abstract

The main interest in the vibration study is concentrated upon the definition of the allowable limit for worker's health supervision. This study deals with the relation between vibration sensitivity and velocity, acceleration and jerk, and also with a scale of sensitivity of vibration. This will contribute to clarify the allowable limit. Although the relations between vibration sensitivity and velocity, acceleration and jerk are related closely in a specified frequency range, there is lack of uniformity in the results obtained by different researchers in this problem. For the advancement of the study, it is desirable to set up an international unit for the estimation of the intensity or magnitude of vibration. To develop and utilize more widely the unit "trem" is promising also for the synthetic estimation of vibtation and noise in the future study. It is also desired to prepare a vibration meter which corresponds to human sensitivity for vibration. Many studies on the allowable limit for the whole body's vibration have been reported, but their values are remarkably different by the reasons of the different experimental conditions or different subjects to be applied. In the present study the allowable limit of vibration is presented with mean and standard deviation accrding to the date of Janeway, Goldman, Helberg, WADC, RAF, VDI and Volkov (U.S.S.R.). (The date also includes the results of Reiher, Meister, Jacklin and Liddell.) The limit curve is 0.060±0.030 G under the condition of 6 c/s as shouwn in Fig.7. Accoding to respective cases, man can abopt the upper or limit of this curve. In addition, the data of Ziegenruecker, Magid, Coermann, Mandel, and Lowry have been examined and represented with mean and standard deviation as the hazardous limit.