Vibration and shock - Mechanical vibration - Shock and vibration sensitive electronic equipment - Methods ofmeasurement and reporting data of shock and vibration effetcs in buildings
1 This International Standard defines methods of measur-ing and reporting shock and vibration data for shock-and-vibration-sensitive electronic equipment (in the operating and non-operating modes) in buildings. The shock and vibration data obtained may then be used to establish a database.
Electronic components are not dealt with in this International Standard.
The types of shock and vibration considered are those transmit-ted from floors, tables, walls or ceilings into an equipment unit. The vibration and shock of individual mechanical or electronic parts inside the unit are not considered.
2 The database established using the methods described in this International Standard should serve as a guide for constructors, users, suppliers and manufacturers of shock-and-vibration-sensitive electronic equipment. The types of equipment envisaged include
a) commercial stationary computer systems (including the peripherals);
b) commercial stationary telecommunication equipment;
c) commercial stationary laboratory electronic instruments, such as electron microscopes, mass spectrometers, gas chromatographs, lasers, X-ray apparatus and electronic apparatus of general character.
Whenever possible it is recommended that the vibration and shock is measured with the sensitive equipment in both the operating and the non-operating mode in order to distinguish between the various possible sources. The types of shock and vibration considered herein can be generated by:
a) external sources, for example traffic or building and construction activities such as blasting, piling and vibratory compaction (sonic booms and acoustic excitations are also included);
b) equipment for indoor use, such as punch presses, forg-ing hammers, rotary equipment (air compressors, air con-ditioners, pumps, etc.) and heavy equipment transported or operated inside a building;
c) natural sources, such as earthquakes, water and wind;
d) human activities in connection with the service or operation of equipment.
The frequency range of interest is 0,1 Hz to 1 000 Hz. (The fre-quency range of interest for earthquake-induced vibrations is 0,1 Hz to 35 Hz.)
The vibration levels of interest, expressed in terms of acceleration values, are in the range from 0,01 m/s2 to 250 m/s2. The upper limit may be produced by high-frequency vibrations or shocks. Limits for low-frequency vibrations are normally expressed in terms of displacement. The durations considered for shocks are in the range 0,5 ms to 25 ms.
Blasting induces a complex vibration wave-form. The response of buildings to such a vibration is in the frequency range from about 5 Hz to 300 Hz.
The vibration levels of interest for transient vibration from blasting are given for information in annex A.