Research On Vibration And Noise Of Double-motor Parallel Gearb And Internal Transmission

With the development of modern science and technology and economy,society has become increasingly demanding for ship power systems.A single diesel propulsion system has been unable to meet the ship's own power requirements in many cases.The ship propulsion system in the dual-vehicle mode is One of the direct means to improve the dynamic performance of ships.As a gear box that transfers kinetic energy and the key components that connect the power equipment,when the dual-vehicle propulsion system is working,it will inevitably face more complex working conditions than the gear box of the single single diesel engine propulsion system.It is based on the complex working conditions of the gearbox of the two-vehicle parallel vehicle propulsion system.Therefore,it is of great significance to study the vibration response and noise of the gearbox and the transmission components of the two-motor vehicle parallel system.This paper takes the gearbox of the Powertrain Laboratory of Wuhan University of Technology as the research object,establishes a reasonable three-dimensional model of the gearbox and its transmission components,and studies the gear transmission characteristics and the mechanism of the gearbox vibration,and then the gear The excitation generated when the component moves is calculated,and then the response of the gearbox case after receiving this excitation is calculated through simulation,and the vibration response of the case is studied.Finally,the vibration of the box is used as the excitation source of the noise generated by the gear box.The radiation noise in the 27m~3 space near the box is simulated and the wall thickness of the box is reasonable.The noise reduction effect of the gear box is studied.The specific tasks are as follows:1)Taking the gearbox of the 2GWH100 dual-vehicle parallel system as the research object,the Pro/E parametric modeling method is used to rationalize the non-standard helical gears that cannot directly call the database model inside.2)By studying the vibration mechanism of gear working,the reasonable calculation of the error excitation and stiffness excitation of gears during operation was carried out respectively.A reasonable virtual prototype dynamics model was established using ADAMS,and the gear based on classical collision theory was used.The parameter setting method of meshing excitation shock simulation validates the correctness of the method.3)A simplified gearbox mesh model was built in Hypermesh and preprocessed.Based on the calculated excitation generated during gear operation,the response of the gearbox case to the excitation was simulated in Ansys and a modal analysis was performed on the case.4)The vibration response of the cabinet is used as the excitation source for the noise generated during the operation of the gearbox.In LMS Virtual.Lab,the radiation noise is calculated and calculated in a 27m~3 space around the gearbox,and the gearbox is operated at different frequencies.The noise intensity generated and the wall thickness is optimized to achieve noise reduction.