Journal of Northeastern University Natural Science ›› 2018, Vol. 39 ›› Issue (1): 108-112.DOI: 10.12068/j.issn.1005-3026.2018.01.022

• Mechanical Engineering • Previous Articles     Next Articles

Vibration Characteristics for the Rocker Arm of Shearer with Gear Meshing Excitation

ZHANG Rui1, ZHANG Yi-min2, ZHU Li-sha1, ZHAO Chun-yu1   

  1. 1.School of Mechanical Engineering & Automation, Northeastern University, Shenyang 110819, China; 2.Shenyang University of Chemical Technology, Shenyang 110142, China.
  • Received:2016-07-19 Revised:2016-07-19 Online:2018-01-15 Published:2018-01-31
  • Contact: ZHANG Yi-min
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Abstract: Experimental research was carried out to study the meshing frequency coupling laws of gear system and vibration characteristics of the rocker arm shell under the gear meshing excitation. According to the gear parameters, the meshing frequency of the system was calculated and the harmonic frequency components were obtained. Based on the finite element model and experimental modal analysis, the inherent characteristics of the rocker arm shell was obtained. Through the rocker arm dynamic characteristics experiment, the vibration accelerations were obtained. Time domain and frequency domain analysis were carried out to get the transmission system frequency coupling rules. Results show that the impact of starting is about 2 times of that of heavy load. The vibration peak occurs on the planetary transmission in steady operation. The main vibration modes of rocker arm are the third and the fifth stages. The joint of planetary and idler has the strongest coupling frequency and the main form of coupling is the combination of characteristic frequencies. Frequency coupling is one of the main reasons that lead to resonance of rocker arm.

Key words: rocker arm of shearer, experimental modal analysis, vibration characteristics experiment, frequency coupling, internal excitation

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