The operating performance and vibration of the motor respectively affect the power and comfort of electric vehicles. Many scholars have only conducted individual studies on the operating performance or vibration performance. In this paper, the operation performance and vibration response of 8-pole 48 slot synchronous motor are analyzed by numerical method. Firstly, the two-dimensional finite element model is established and verified. Then the operation performance and analysis are carried out. The output power is efficient but its rotational pulsation is serious, which is about 27.12%. Finally, the vibration analysis and harmonic response analysis are carried out and it is found that at 2400Hz and 4000Hz which is close to the third and fourth natural frequencies of the motor stator mode. The displacement of the tooth tip vibration is serious and the vibration cloud diagram are obtained.

In this paper, a damage detection method based on long-short term memory (LSTM) recurrent neural network is proposed. The structural damage identification is realized by directly extracting the features in the time-domain data of structural dynamic test. The LSTM network is trained and tested under different noise levels based on the acceleration data generated by the finite element model of gravity dam under different damage conditions The grind search method is used to optimize the network parameters. The results of numerical test and cantilever vibration test show that the damage detection method based on LSTM has high damage identification accuracy and anti noise ability. Compared with the traditional recurrent neural network (RNN) and gated recurrent unit (GRU) neural network, the test accuracies of LSTM on diffferent damage conditions increase and the maximum improvement is up to 16.25%.

In order to study the influence of the strength of geometric nonlinearity on the applicability of Galerkin discretization method under the background of single horizontal cable. Two kinds of different non-dimensional parameters are introduced to dimensionless the nonlinear equations of motion in the cable plane, and it was transformed into an ordinary differential equation using Galerkin method. Using the method of multiple scale to get perturbation solution, the corresponding frequency response equations are derived, and draw the amplitude-frequency response curve; Then MATLAB is used to obtain the time history curve of the system. Finally, ABAQUS software is used to carry out finite element simulation, and the results are compared with the numerical solutions of the method. While the time history curve of the system is obtained by numerical simulation, the two dimensionless methods are also compared. The results show that the Galerkin discrete method is more suitable for systems with weak geometric non-linearity. Dimensionless will lead to the increase of the nonlinear term coefficient of the system. system.The?numerical?solutions?obtained?by?the?two?dimensionless?methods?are?more?similar?with?the?increase?of?Irvine?coefficient. The research results may provide a basis for the numerical solution of nonlinear vibration of cables and contribute to the perfection of the theory.