ICS 17.160                         MED 28

Reaffirmed 2019

NATIONAL FOREWORD

This Indian Standard (Part 1) which is identical with ISO 18431-1 : 2005 ‘Mechanical vibration and shock - Signal processing - Part 1: General introduction’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on the recommendation of the Mechanical Vibration and Shock Sectional Committee and approval of the Mechanical Engineering Division Council.

This part assumes that the data have been sufficiently reduced so that the effects of instrument sensitivity have been included. The data considered in this part are to be a sequence of time samples of a physical quantity, such as a component of velocity, acceleration, displacement or force. Experimental methods for obtaining these data are outside the scope of this part.

In the recent past, nearly all data analysis has been accomplished through mathematical operations on digitized data. This state of affairs has been accomplished through the widespread use of digital signal acquisition systems and computerized data-processing equipment. The analysis of data is therefore primarily a digital signal-processing task.

The analysis of experimental vibration and shock data should be through of as a part of the process of experimental mechanics that includes all steps from experimental design through data evaluation and understanding.

Under the general title ‘Mechanical vibration-and shock-signal processing’, the standard is in seven parts, other parts are following:

Part 2 Time domain windows for Fourier Transform analysis

Part 3 Bilinear methods for joint time-frequency analysis

Part 4 Shock response spectrum analysis

Part 5 Methods for time-scale analysis

The text of ISO Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:

a) Wherever the words ‘International Standard’ appear referring to this standard, they should be read as ‘Indian Standard’.

b) Comma (,) has been used as a decimal marker while in Indian Standards, the current practice is to use a point (.) as the decimal marker.