Vibration And Noise Analysis For Oil Pump Of Vehicle Engine

It is a very important interest that the noise and vibration issue has been more relatedto by researchers and business engineering. NVH analysis is a larger field of researchdeveloping from this issue that be widely used in vehicle industry especially automotiveand aerospace. And it is greatly effecting the environmental improvement and energysavings. However, the noise increasing of the traditional powertrain are more and moreaccess the technology bottleneck and hard to breakthrough obviously, as vibration ofengine, aeroacoustic of car, noise of air-conditioning system et al. So, the well-knowninternational OEMs are focusing they attention to vibration and noise reduction on spareparts suppliers. Oil pump is the lubrication system of engine. And because of the highspeed rotation, it is not only consuming a considerable portion of the engine power but alsogenerating more severe vibration and bringing noise.The performance of various aspects for oil pump were discussed and generalevaluation methods and indexes were described based on common requires andconsiderations especially the vibration and noise in first chapter. Nonlinear contactdynamics behavior of gear transmission system has been considered in second content.And the dynamics behavior of gear transmission element was studied and analyzedcombine with typical vibration characteristics of gear transmission system.It is different from ordinary gear transmission system that the oil pump structuressuffer from both torque of engine and other load like oil pressure and shock of gear. So thisvibration that was leaded from these complexity loads is belongs with the complexityvibration behavior was named as Fluid-Structure coupled vibration(FSCV). The problemof this type should consider the Fluid-Structure coupled affect and could not solve bytraditional method. The analysis method and basic theory of FSCV has introduced in thirdcontent of this paper, and the problem of complexity vibration with multi-physics couplingwas preliminary studied and developed. Through combines with the waterfall andspectrogram of engine bench testing, the modal analysis for two different typical types oilpump products were processed in the fourth content. Then the structures were improved based on results of modal analysis and the better results than original structure have beenobtained. The results of modal analysis were contrasted with testing data and the reliabilityof simulation was verified effectively, too.After the modal analysis and structure improvement, testing experiments of vibrationand noise in oil pump was designed in fifth content, which consists of integratedperformance testing equipment for oil pump. The regular variation pattern has obtainedthrough contrast and analysis the data tension curves. In addition, the testing signals wereanalyzed and processed effectively by FFT transform format. It is significance fordetermine the NVH performance of oil pump.In order to find out the reason and principle of the abnormal sound, identification hasbeen done in the condition of idling in sixth content. By analyzing the data of theexperiment, the range of the origin can be narrow down. The oil pump of the lubricationsystem was preliminarily judged as the part of the trouble unit. Than a shock experimentwas designed of the single part. After it, the signal of the oil pumps both on the faultedengine and the faultless engine was picked up respectively. By comparative analysis anddata feature of the both signal, we predicted the reason of the problem.A new method to solve the complexity vibration response of has been introduced inseventh content. In this method, Testing and simulation have been combined with eachother and the innovation works also based on this combine relationship. After collectingthe testing data, a couple loads have been assumed, and the transfer function would besolved. Then, the loads spectrum would be solved at last and based on these loads, thevibration response also could obtained. In the eighth content, two new methods to solve theradiation noise of complexity vibration structure based on testing have been introduced.The first method named direct segmentation method, this method mainly based on modalanalysis. The operating is a very easy, has enough reliability and could be widely used inengineering. The second method is a strict theoretical basis method that base on thevibration of seventh content. It is a high accuracy method to solve the radiation noise andis a very useful and innovative method, too. This paper mainly introduces some innovationproblems and solves methods for vibration and noise as sample of oil pump, and it is highsignificance to solve the complexity vibration and noise problems.