Random Vibration Analysis of the XM2l Decontaminant Pumper Module of the Modular Decontamination System.
Final rept. Jan-Jun 97
EDGEWOOD RESEARCH DEVELOPMENT AND ENGINEERING CENTER ABERDEEN PROVING GROUNDMD
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The XM21 Decontaminant Pumper module of the Modular Decontamination System was analyzed using finite element analysis techniques to show why the first design iteration passed transportation vibration testing, the current design iteration did not, and whether the proposed changes to the system will pass. The baseplate in the current design developed a fatigue crack at a weld when vibration tested. The failure was caused by the switching of position between the pump and the alternator. This was the only change between the two systems. The results of the analyses show that switching the pump from the right side to the left side causes a 28 increase in the stress level of the weld that failed from 9,758 to 12,495 psi. A modification to the pumpalternator support bracket was proposed as a solution to the failure, and this design was also analyzed. The proposed design analysis results showed that the weld stress levels were improved to be 22 lower than the first design and 39 lower than the current design. The stress in the weld that failed was reduced to 6,834 psi. The proposed design change will eliminate the failure experienced in the current design.
- Chemical, Biological and Radiological Warfare