Characterization and simulation of a sequence of impulsive loads
Abstract
A special class of dynamic loads is that of a sequence of impulsive loads. The testing of a structure's capability to withstand this kind of load is performed by simulating an impulsive load sequence on a shaker. Commercial vibration control systems do not enable this kind of simulation. The paper presents the results of an investigation into two methods that enable the simulation of these loads on a shaker. After the presentation of some characteristics of the impulsive load sequence, the method of mixed discrete and continuous spectra is presented. An example of the method's implementation, that shows how these characteristics are duplicated follows. Next the method of 'phase controlled PSD (power spectral density)' is presented including control of the features of the sequence by using the PSD frequency range and the width of the controlled phase spectrum range. An example of implementation of the method follows.
- Publication:
-
Israel Society of Aeronautics and Astronautics, 34th Israel Annual Conference on Aerospace Sciences
- Pub Date:
- February 1994
- Bibcode:
- 1994isaa.conf...79S
- Keywords:
-
- Dynamic Loads;
- Harmonic Control;
- Impulses;
- Power Spectra;
- Random Loads;
- Transient Loads;
- Vibration Simulators;
- Algorithms;
- Shakers;
- Shock Resistance;
- Vibrational Stress;
- Structural Mechanics