SPECTRAL CHARACTERISTICS OF SOME PRACTICAL VARIATIONS IN THE HALF-SINE AND SAWTOOTH PULSES

This report deals with shock analysis and design as they affect equipment. Considered in the analysis is a two part function composed of a ramp tangent to a halfsine pulse in which the rise times and decay times can be controlled independently of each other. Such a pulse is more representative of th...

Full description

Saved in:
Bibliographic Details
Main Author: Schell, Edward H
Format: Report
Language:English
Subjects:
AIRCRAFT EQUIPMENT
ENVIRONMENTAL TESTS
FAILURE(MECHANICS)
FOURIER ANALYSIS
MECHANICAL WAVES
Mechanics
SHOCK(MECHANICS)
SPECTRAL ANALYSIS(MATHEMATICS)
Theoretical Mathematics
Online Access:Request full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:This report deals with shock analysis and design as they affect equipment. Considered in the analysis is a two part function composed of a ramp tangent to a halfsine pulse in which the rise times and decay times can be controlled independently of each other. Such a pulse is more representative of the physical condition present in a partially plastic, partially elastic shock machine such as the lead pellet types. The pulse is changed by increments from an ideal terminal peak sawtooth to an ideal half-sine. Positive and negative response spectra with a range of damping from zero to critical are presented. Fourier spectra are also presented. Insofar as is known, this is the first time these test pulses have been studied in such detail. The data presented should prove quite useful for designers using several response spectrum or Fourier spectrum techniques for design problems resulting from sawtooth or half-sine shock tests. The report shows an important type of modal interaction failure which cannot be adequately excited with a symmetrical waveform even if testing is accomplished in both directions.