Home > Measuring-Instruments > Vibration Measurement Instruments


Topic under  Vibration Measurement Instruments
Source: www.ista.org 
File size: 42.51 KB
File type: pdf
Last download on: Sat Mar 25, 2017 02:55:53 PM
Short Desciption:
ABSTRACT How many hours of vibration testing equals how many miles (or kilometers) of transport? A simple question, but unfortunately the answer is neither simple nor straightforward. This paper examines the factors involved in attempting to construct such an equivalence, explains the methodology behind an accepted and proven approach, and discusses the issue of accelerated (time-compressed) vibration simulation in detail.

Vibration Tests There are three categories of commonly-used tests in the transport packaging field. First is the “fixed-displacement” test, also known as a repetitive shock or “bounce” test, in accordance with ASTM D999 Method A1 or A21 or similar. In this test, the specimen is placed on the table of a machine which moves with a constant one inch (25 mm) displacement, either linearly or in a circular motion. The test is usually conducted at a frequency (typically around 4.5 Hz.) where the specimen just begins to intermittently leave the table surface, as evidenced by the ability to insert a thin shim under it. Technically this is not vibration at all; the motion causes a small shock or “bounce” each time the package re-contacts the table. This test is not a simulation of actual transport – although there may be “bouncing” of packages in transport vehicles, it is not at a constant frequency and amplitude.
Bookmark or share this info on Google+ and leave comment at below :

Bookmark and Share

People who downloaded this also viewed in this sites:

Basic Vibration Isolation Theory
The object of the following is to acquaint the user with the principles and I terminology encountered in analyzing basic vibratory systems....

Torsional Vibration of Turbo-Machinery
Torsional Vibration of Turbo-Machinery By Duncan Walker * Publisher: McGraw-Hill Professional * Number Of Pages: 189 *...

Vibration isolation concerns means to bring about a reduction in a vibratory effect. A vibration isolator in its most elementary form may be...

    Leave comment :



    Related Free Files

    UFC 3-450-01 Noise and Vibration Control... - Download: 241 times
    THEORY OF VIBRATION ISOLATION... - Download: 142 times
    Vibration Isolation Terminology... - Download: 64 times
    Torsional Vibration of Turbo-Machinery ... - Download: 430 times
    Basic Vibration Isolation Theory... - Download: 109 times

    eXTReMe Tracker