The performance of vibration and noise of twin screw compressors is an important evaluation index of the product comfort.It is of great guiding significance to study the compressor exciting force characteristics for vibration and noise reduction.In this paper,a gas excitation force model and a screw-rotor contact force model of a twin screw refrigera-tion compressor are established,and the gas excitation force and the screw-rotor contact force of the compressor is calculat-ed.Then,the sample machine of the twin screw compressor is prepared and its vibration response and modals are tested re-spectively under the excitation of the two kinds of forces.A finite element model calibrated by the testing modals of the twin screw compressor is used to verify the vibration response under the gas exciting force and the screw contact force obtained from the proposed models.The results show that the frequency components of gas exciting force and screw contact force are both fundamental frequency and harmonic frequency.The gas exciting force is mainly contributed by the fundamental fre-quency of gas flow pulsation.And the screw contact force is dominant rather than the gas exciting force.The results may pro-vide a guidance for vibration control of twin screw refrigeration compressors.
关键词
振动与波/激励特性/气体激励/啮合激励/螺杆压缩机
Key words
vibration and wave/exciting characteristics/gas exciting force/contact force/screw compressor
维普
万方数据