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Test equipment for a parachute tear-band to measure the cable force dynamics |
| LI Dongxing1, HOU Senhao1, SUN Haining1, LI Fan1, TANG Xiaoqiang1,2,3 |
1. Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China;
2. State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China;
3. Beijing Key Lab of Precision/Ultra-Precision Manufacturing Equipment and Control, Beijing 100084, China |
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Abstract Test equipment was developed to test the dynamic forces on the cable of a parachute tear-band for high-speed impact loads. The mechanics of the test equipment were simplified as a spring damping model with the system dynamics equations then derived based on the second Lagrange equation. The Runge-Kutta method was used to solve the equations to calculate the tension in the cable during the band tearing test. The results showed that the rope damping plays a major role in the early stage of the high-speed impact loading. The influences of the elastic modulus, damping and mass ratio of the two ends on the cable forces were then further studied. Comparison of the theoretical model with experimental data shows that the predicted cable forces are consistent with the experimental data, which verifies the model accuracy. The results of this study can guide the design of tear-band test equipment.
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| Keywords
tear-band test equipment
impact loads
cable forces
dynamic model
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Issue Date: 04 March 2023
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2023,
Vol. 63
