Reproduction device for rocket sled track spectrum and method thereof

Abstract

The invention discloses a reproduction device for a rocket sled track spectrum and a method thereof. A deep bidirectional cyclic neural network is used to construct a machine learning model, a plurality of groups of white noise excitation signals are constructed as model output, the excitation signals are applied to a bracket-track system and acceleration signals of one point on the track are collected as model input, and the model is trained and a structural response-excitation model is obtained; track random irregularity simulation is carried out based on a power spectral density function, and spatial power spectral density is converted to time domain signals by inverse discrete Fourier transform; expected spectrum signals are converted to acceleration signals and are inputted to a learning model to obtain expected excitation signals, the excitation signals are applied to the bracket-track system, and response point acceleration signals are collected and compared with an expected waveform for realizing track spectrum reproduction. Through setting the parameters of the algorithm and the layer number of the network structure, features of the structure can be better acquired, and anexcitation applying scheme with high accuracy can be given.

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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