Energy transmission in penetration process of percussive machines

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (9) : 202-207.

Wang Xue-Qing1， Zhao Tong-Wu2

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Abstract

The energy transmission in percussive machines’ penetration process is a key problem of percussive systems. Here, for general percussive penetration systems with a single cylinder piston, the expression of energy transfer efficiency for a percussive system with a single cylinder piston was derived. Furthermore, the dual energy conversion process and residual energy in piston and tools were presented with the wave theory. Influences of system parameters on energy transmission were analyzed. The study showed that in the dual energy conversion process, the system penetration efficiency η is a product of the incident wave effective conversion efficiency and the penetration conversion efficiency; there is an optimal region for η (η>75%) when the system constant q=0 and 1<θ<2.5; the residual energy is lower when q≥0, but it increases rapidly with decrease in q when q<0; increase in the residual energy affects normal operation and fatigue life of a percussive system. Taking tests on a percussive energy transmission test system as examples, the results of calculation agree well with those of tests.

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percussive penetration / stress wave / energy transmission

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Wang Xue-Qing1， Zhao Tong-Wu2. Energy transmission in penetration process of percussive machines[J]. Journal of Vibration and Shock, 2018, 37(9): 202-207

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