Dynamic Analysis and Fault Diagnosis for Gear Transmission of a Vibration Exciter of a Mine-Used Vibrating Screen under Different Conditions

Abstract

The helical gear pair of a box-type vibration exciter of a mine-used linear vibrating screen is subjected to complex excitation and prone to broken tooth failures. At present, investigation regarding the difference and particularity between gear transmission in vibrating screens (i.e., vibration machinery) and that in rotating machinery is still a challenge, which is the key to revealing the performance and failure mechanism of gear transmission in the premise of application to vibrating screens. In order to intuitively display the peculiarity of gear transmission on the exciter, an innovative virtual prototype model of a gear pair of a vibrating screen exciter is proposed. This model considers the effects of internal and external excitation, such as the friction and lubrication of the gear, strong alternating load produced by a large eccentric block, the reciprocating motion of the screen body, the large clearance of bearing and so on, and its correctness is verified. Based on the comparison, the inducement for the high fatigue rate of exciter gears is revealed. Models of a vibrating screen’s excitation system with different degrees of broken teeth are also established, and tooth fault features are proposed for fault detection. Sensitive indicators for the degradation degree of tooth damage are put forward, and the monitoring strategy is presented that with the increase of damage degree, the waveform index and pulse index of axial vibration acceleration increase. The analysis results provide powerful support for the optimal design of the vibrating screen’s exciter gears and fault diagnosis.

Bibliometric Analysis of Engine Vibration Detection

“…In the 1970s, after the automobile nondisintegration testing technology was listed as the development and application project of the State Science and Technology Commission, the work of domestic researchers led to the development of the comprehensive testing table for automobile performance, the comprehensive engine testing instrument, and other equipment; however, the equipment in that era was not perfect and the quantity was limited. From the 1990s onwards, the relevant research includes the book "Vibration Monitoring and Fault Diagnosis of Rotating Machinery" by Zhang Zhengsong et al, which introduces the specific practice of this technology in a more comprehensive and basic way from a variety of application scenarios, and has a high academic status [8]. With the continuous development of science and technology, China's application needs in related fields have been increasing, especially in the field of military aero-engine technology and maintenance.…”

Towards Condition Monitoring: Fabrication and Finite Element Analysis of A Helical Gear Transmission Rig for Fault Simulation

“…The analysis of the dynamic characteristics is conducted subsequent to the careful consideration of both the friction and axial stiffness components. Similarly, in [15] a proposal is put forth to develop an innovative virtual prototype model of a gear pair for a vibrating screen exciter, with the aim of effectively demonstrating the unique characteristics of gear transmissions in this context. These studies demonstrate the importance of integrating vibration analysis alongside other analytical methods, such as finite element analysis, to enhance the accuracy and effectiveness of fault simulations in helical gear transmissions, among many other studies [16], [17].…”