NVH Performance Prediction And Optimization Design Of A High Pressure Oil Pump

With the increasing requirements of modern production on machinery and equipment,and the stricter national standards for energy saving and emission reduction,the noise generated by traditional powertrains such as diesel and engine body vibration noise,automobile body and tire noise,transmission system and The noise of the refrigeration system has gradually approached the technical bottleneck after repeated optimization and improvement,and it is difficult to make a major breakthrough.Therefore,the larger companies in the world are gradually turning their attention to the vibration and noise reduction of local parts..With the improvement of the performance of high-pressure oil pumps,its vibration and noise are getting bigger and bigger.For this reason,this project aims to further reduce the vibration and noise level of construction machinery through the prediction and optimization of the NVH performance of a high-pressure oil pump,which is the design and application of high-pressure oil pumps.for reference.1.This article first summarizes the vibration and noise of high-pressure oil pumps,introduces the application of digital simulation technology in the vibration and noise reduction of high-pressure oil pumps,investigates and explains the vibration and noise reduction work based on high-pressure oil pumps at home and abroad,and combines the test standards The NVH performance index of high-pressure oil pump is proposed.2.Taking a certain high-pressure oil pump as the research object,considering the operating conditions of the high-pressure oil pump,and combining the oil pressure changes in each cavity,the structural strength and fatigue life of the high-pressure oil pump are studied and analyzed.The results show that the structural strength and fatigue life of the high-pressure oil pump are equal.Can meet work needs.3.Establish a multi-body dynamic model of the high-pressure oil pump.Considering that there is no absolute rigid body in the actual situation,perform modal analysis on the main components of the high-pressure oil pump and create a rigid-flexible coupling model based on the modal neutral file to obtain higher accuracy The prediction results of multibody dynamics analysis.On this basis,the load excitation at each key position of the highpressure oil pump is obtained,and the load-time domain curve is converted into a frequency domain curve through fast Fourier transform.4.According to the load excitation at each position obtained by the multi-body dynamics analysis,the vibration frequency response analysis of the high-pressure oil pump is carried out.Obtain the vibration acceleration of the high-pressure oil pump at the target frequency,and calculate the vibration acceleration vibration level based on the analysis results.According to the test standards,the external acoustic cavity model of the highpressure oil pump was established,and then the external acoustic cavity and the structural model of the high-pressure pump were coupled by interpolation to create an acousticstructure coupling model of the high-pressure oil pump.Based on this,the radiation noise of the high-pressure oil pump was analyzed.5.According to the radiation noise results and target requirements,three optimization schemes are proposed for adding support structure,sound insulation cover and damping material layer,and the radiation noise corresponding to the optimization scheme is analyzed,and the effect of the original scheme is compared and analyzed to verify the rationality of the optimization scheme.