A method for analyzing vibration characteristics of transmission gearboxes in coupled oscillation state

Abstract

The invention provides a drive gear box vibration characteristic analysis method under a coupled oscillation state. The method comprises the following steps of using a traditional numerical value calculation method to synthesize time-varying stiffness excitation and transfer error excitation to obtain meshing gear pair internal dynamic excitation under a preset rotating speed condition with periodical characteristics; based on a diesel engine gear system characteristic-torsional vibration of a shaft system-speed regulating system coupled oscillation model, obtaining an instantaneous rotation speed of a drive gear system driving gear, and adjusting an instantaneous meshing cycle of a meshing gear pair to obtain modified gear internal dynamic excitation; establishing a three-dimensional finite element model of a drive gear box, and comparing deviations of a modal calculation result and an experiment test result; loading the modified gear internal dynamic excitation to a position of a gear pair meshing contact line in the three-dimensional finite element model of the drive gear box, and solving the oscillation characteristic of the drive gear box. According to the drive gear box vibration characteristic analysis method under the coupled oscillation state, based on the diesel engine gear system characteristic-torsional vibration of a shaft system-speed regulating system coupled oscillation model, the result of the oscillation characteristic solution is more accurate.

Description

technical field [0001] The invention belongs to the field of vibration control engineering, and in particular relates to a method for analyzing the vibration characteristics of a transmission gearbox in a coupled oscillation state. Background technique [0002] In the research of traditional gear vibration characteristics, finite element method and numerical calculation method are often used to obtain periodic gear meshing excitation, and the vibration characteristics of gear system and gearbox are calculated accordingly. However, the meshing frequency and its multiplier response based on the periodic gear meshing excitation can better reflect the gear vibration state under normal working conditions, but it cannot reflect the actual gear vibration under the coupled oscillation fault condition. state of vibration. [0003] The research on the analysis of gear vibration characteristics based on traditional methods such as finite element method and numerical simulation method ...

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Problems solved by technology

For example, Cheng Zhixue of North China Electric Power University simulated the internal excitation of the gear, and used ADAMS to simulate the vibration characteristics of the gear train of the gearbox, and compared the vibration response with the experimental test to analyze the vibration characteristics, but only studied the vibration characteristics under normal working conditions. Vibration characteristics of gear box drive train (Cheng Zhixue. Analysis of vibration characteristics of 1.5MW wind turbine gearbox [D]. Master's degree thesis, Beijing: North China Electric Power University, 2014.); Yang Chengyun from Chongqing University gave stiffness excitation, error excitation, The numerical simulation method of meshing shock excitation systematically analyzes the vibration dynamic response of the gear system, analyzes the shock dynamic response of the gearbox, and estimates the shock resistance of the gear system, but does not consider the stiffness of the gear pair due to external speed fluctuations Influence of excitation, error excitation and meshing impact excitation (Yang Chengyun. Research on coupled vibration response and shock resistance performance of gear transmission system [D]. Doctoral dissertation, Chongqing: Chongqing University, 2006.)

[0004] Aiming at the coupling oscillation problem of reciprocating machinery, Han Xiao from Harbin Engineering University established a coupling model between the torsional vibration of the propulsion shafting and the speed control system for the diesel engine propulsion shafting and its speed control system of a special type of workboat, and successfully reversed the The coupling oscillation fault of the real ship was simulated, but the gear transmission part was not considered in the torsional vibration model of the propulsion shafting (Han Xiao. Research on the coupled oscillation of the diesel engine speed control system and the propulsion shafting torsional vibration of a 4000-ton working ship[D]. Master's degree dissertation, Heilongjiang: Harbin Engineering University, 2015.); Professor Li Wanyou from Harbin Engineering University invented a shaft compound vibration and control coupling modeling analysis system and analysis method for a diesel engine with a camshaft. The established The compound vibration elastic system model of the transmission system including the timing gear train only simplifies the timing gear train into an elastic system composed of multiple moments of inertia and elastic shaft segments, and has the characteristics of torsional, rotational and longitudinal vibration compound vibration, but It does not consider the influence of the internal dynamic characteristics of the gear mesh on the coupling model, nor does it consider the influence of the coupling model on the internal dynamic characteristics of the gear mesh and the vibration characteristics of the gear (Li Wanyou, Yu Shuwen, Guo Yibin, Chen Meilong, Rate Zhijun, Wang Donghua, Lu Xiqun, Jiang Chenxing. A modeling analysis system and analysis method for compound vibration and control coupling of a diesel engine with a camshaft [P]. Chinese patent, application publication number: CN105808847A.)

[0005] To sum up, in the traditional study of gear vibration characteristics, the gear vibration characteristics obtained by periodic gear mesh excitation simulation cannot well reflect the actual vibration characteristics in the coupled oscillation state; In the study of regulating coupled oscillation, since the interaction between the coupled oscillation characteristics and the dynamic excitation of the gear mesh is not considered, the obtained vibration response of the transmission gearbox deviates greatly from the actual vibration characteristics in the coupled oscillation state

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