A Method for Determining Continuous Vibration Transfer Spectrum of Rocket Sled Test
A technology of vibration transmission and determination method, which is applied to instruments, measuring devices, and measuring ultrasonic/sonic/infrasonic waves, etc. It can solve problems such as inability to realize continuous frequency band analysis, high noise, and lack of direct acquisition methods for high-frequency vibration information.
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Embodiment 1
[0124] Taking the tested product as an example, the effectiveness of the power spectrum amplitude correction method proposed by the present invention is verified.
[0125] The setting conditions are as follows: In the rocket sled test, the sampling frequency of the sensor is 9.6kHz, and the vibration power spectrum of the tested product based on the periodic spectrum is as follows: figure 2 As shown, the initial power spectrum based on the AR model is as image 3 It can be seen that there is a slight difference in magnitude between the two. Adopt the method of the present invention, the power spectrum amplitude correction coefficient is c=0.723, after this value is substituted into the correction formula, the accurate power spectrum of the tested product based on the AR model is as follows: Figure 4 shown. Compare image 3 with Figure 4 As can be seen, Figure 4 The power spectrum curve of image 3 The power spectrum curve of the power spectrum moves down as a whole, ...
Embodiment 2
[0127] From the rocket sled test, the continuous vibration transfer spectrum between stages is calculated according to the vibration information of multiple sensors to realize the analysis of vibration transfer characteristics.
[0128] The setting conditions are as follows: In the rocket sled test, a multi-stage installation method is adopted, that is, the tested product is installed on the vibration-damping plate, and then the vibration-damping plate is installed on the sled through the vibration isolator. The sensor sampling frequency is 9.6kHz. During the process from start to stop, the heading sensor installed on the skid, the heading sensor installed on the vibration-damping plate, and the heading sensor installed on the inertial platform (the product under test) respectively collect and record the corresponding acceleration value information, and the vibration is obtained through a high-pass filter. data, and further get the power spectral density.
[0129] The vibrati...
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