Optimization Design Of Vibration And Noise Reduction For A Light Generator Set

Light power generating sets driven by internal combustion engines are widely used in various fields such as mechanical engineering.Light power generating sets can generate significant vibration and noise during operation,causing significant physiological discomfort to equipment users and nearby workers,and even causing significant safety hazards to operators.Therefore,reducing the vibration and noise of light power generating sets is extremely important.This paper summarizes the traditional vibration and noise reduction methods for generating sets and the design methods for traditional mufflers.Based on the structural requirements of light generating sets,using Workbench software,finite element modeling,vibration and noise analysis,and optimization improvements are conducted for the generator,internal combustion engine body,and muffler of light generating sets.Firstly,based on the structural dimensions of the stator and rotor of the generator,this paper conducts parametric modeling in Maxwell software,calculates various performance parameters and electromagnetic characteristics of the generator based on the finite element model,obtains the time domain and frequency domain characteristics of the main excitation radial electromagnetic force that causes electromagnetic noise through electromagnetic field analysis,adds the electromagnetic force as an excitation source to the corresponding stator teeth to obtain its vibration characteristics,and proceeds from the mechanism of electromagnetic noise generation,The magnetic steel structure of the original rotor was optimized.After optimization,the maximum vibration acceleration decreased from 2.3 m/s~2before optimization to 1.89 m/s~2,with a decrease of 17.83%.Secondly,conduct finite element modeling of the internal combustion engine body in Workbench Ansys software,perform transient dynamic calculations,modal analysis,and frequency response analysis on it,observe the vibration results of three measuring points,and based on the vibration response results,strengthen and improve the ribs at the position of the fuel tank connecting hole on the body.After simulation and verification,the vibration velocity amplitude at the 10th harmonic frequency is optimized to decrease from 0.09m/s to 0.05m/s,with a decrease of 44.4%,The vibration velocity amplitude at the 13th harmonic frequency decreased from 1.04m/s to 0.36m/s,with a decrease of 65%.Finally,this article has some innovation in the optimization of mufflers.Based on the structural morphology of mufflers,parametric modeling is conducted in Solidworks,and boundary conditions are established and meshed in Workbench software.The transfer loss and pressure loss are calculated in the acoustic module and the FLUENT module.Before establishing a response surface model for muffler size and noise reduction,parameter sensitivity analysis was conducted for each size parameter of the muffler,key dimensions were selected,and DOE design was conducted.A Kriging response surface model was established using the hypercubic Latin sampling method.Finally,NSGA-Ⅱ algorithm was used to optimize the response surface.After optimization,the noise reduction at each frequency point was increased by a minimum of 14%and a maximum of 85%.