Device and method for reproducing rocket sled track spectrum

Abstract

The invention discloses a reappearance device and method for rocket sled track spectrum, adopts a deep bidirectional cyclic neural network to construct a machine learning model, constructs several groups of white noise excitation signals as the output of the model, and applies the excitation signal to the bracket-rail The acceleration signal of a point on the track is collected by the system as the model input, the model is trained and the structural response-excitation model is obtained; the random irregularity of the track is simulated based on the power spectral density function, and the spatial power is transformed by the inverse discrete Fourier transform method The spectral density is converted into a time-domain signal; the expected road spectrum signal is converted into an acceleration signal and input into the learning model to obtain a predicted excitation signal, which is applied to the bracket-track system to obtain the acceleration signal of the response point and the expected waveform for comparison to realize road spectrum reproduction . The present invention can better obtain the characteristics of the structure by setting the parameters of the algorithm and the number of layers of the network structure, thereby providing an excitation application scheme with higher accuracy.

Description

technical field [0001] The invention belongs to the technical field of motion simulator control, and in particular relates to a reproducing device and method for a track spectrum of a rocket sled. Background technique [0002] The high-speed rocket sled test slide rail is a large-scale ground dynamic simulation equipment. The rocket sled test uses a rocket to propel the rocket sled installed with relevant test pieces and related accessories and test equipment to run at high speed on the slide rail. Its motion state is complex, and it is difficult to give good prediction results in theory and simulation calculations. Using the road spectrum reproduction device to carry out simulation experiments in the laboratory environment can better study the sled-rail coupling effect in the rocket sled motion. The road spectrum reproduction device includes an excitation system, a structural system and a control system. [0003] In the current literature, the road spectrum recurrence con...

AI Technical Summary

Problems solved by technology

The time-domain control method directly uses the time history signal obtained by actual measurement, and uses the controller to control the controlled system to track the expected response signal. This method has a small amount of calculation and a simple program, but it will be affected by noise and cause deviations in the model, and the control process will not be accurate. Stablize

[0004] In addition, due to skid-rail coupling, structural systems generally have nonlinear characteristics. Traditional control methods such as frequency response function or time-domain signal control methods are difficult to reproduce the desired road spectrum or waveform, which affects the experimental results.

Therefore, a new type of road spectrum reproduction device must be used, and there is no corresponding technology to achieve this purpose at present

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