Research On Dynamic Detection Method Of Diskrotor Based On Bionics And Air Suspension Principles

Rotating machinery plays an important role in many fields,such as national defense security and national economic development,which is an important part of mechanical system.The unbalance of disc-type rotor is not only an universal problem in a kind of rotating machinery,but also one of main causes relating with the rotor system failure.Therefore,it has important theoretical significance and application value researching on dynamic balance method and technology of disk rotor.In recent years,dynamic balance technology has been greatly developed with the rapid development of electronic,computer and testing technology.The results play an important role in promoting the operation and development of rotating machinery with high speed,deep efficiency and strong reliability.Nowadays,most of researchers are dealing with the dynamic balance test,asymmetric and non-planar mode rotor balance,untested weight balance,automatic balance and so on.In order to improve the accuracy and efficiency of disc rotor balance,The dissertation analyses the disk rotor static unbalance and even unbalance.As well it combines with bionic theory and air suspension technology,a disc rotor air suspension dynamic balance test bench has been designed and developed,which verifies the feasibility of the theory.The main research works of this dissertation are as follows:Firstly,it proposes a measurement method of air suspension static balance rotor and even balance rotora in this dissertation,according to the basic analysis of development trend and existing problems of the existing disk rotor dynamic balance measurement technology.The measurement methods of the air suspension static balance rotor and the even balance rotor are delivered in order to solve the problem of low detection accuracy,which cause by the transmission of the machine itself according to the dynamic balance measurement theory and air suspension principle of the disk rotor.It considers the offset of the horizontal displacement of the suspended disk,the dynamic unbalance of the disk rotor is calculated by the means of the relationship equation between the static unbalance and the even unbalance of the disk rotor.And it studies the influence of air damping on the error of disk rotor.Furthermore,the detection error is reduced and the testing accuracy of air suspension disk rotor dynamic balance test bench is also enhanced.The proposed detection method ensures the detection accuracy,shortens the detection time and reduces the detection cost.In addition,it does not need calibration disk rotor calibration.Secondly,it put forwards microstructure of winged ear owl wing surface by the means of bionic principle and the air suspension theory combined.It reveals the influence of air flow on bionic structure by the means of simulation analysis and experimental verification.The optimal design parameters of the bionic structure are given by using genetic algorithm.Thirdly,The dissertation analyzes the influence of gas pressure fluctuation amplitude and frequency on rotor spatial attitude,as well the causes of rotor self-excited vibration are discussed.Then,the dissertation applies digital filtering and multi-frequency signal parameter identification technology to build up a disc rotor air suspension dynamic balance test bench of control and detection system.As for it,the direct digital closed-loop control of air pressure is realized.In order to solve the problem of signal denoising of sensor acquisition,the data has been preprocessed by eliminating pulse interference and secondary polishing.The 3? criterion threshold denoising method is proposed to improve the denoising effect of sensor collected signal.Furthermore,it illustrates a multi-sensor data fusion algorithm based on particle swarm optimization improved BP neural network to enhance the precision of sensor signal acquisition.The anti-interference ability and the convergence speed of the sensor when collecting signals are increased,thereby improving the accuracy of sensor data fusion.Finally,The dissertation designs the disc rotor air suspension dynamic balance test bench and study the experimental method.According to the basic principle and engineering requirements of disk rotor air suspension dynamic balance measurement,the corresponding design techniques of related principles and mechanisms are studied.It solves the technical problems such as poor gas suspension stability,large required air pressure,and inaccurate sensor acquisition signals in this dissertation.As well the measurement accuracy is improved.The dissertation designs the experimental process and experimental method,in the meanwhile,the dynamic balance detection of a disk rotor is carried out.It verifies the effectiveness of the proposed method proceeding experiments.The research of the paper provides a reference for the research of disc rotor dynamic balance measurement technology.