Method and device for analyzing vibration modes of rail vehicles
A rail vehicle and shape analysis technology, applied in measuring devices, vibration testing, railway vehicle testing, etc., can solve the problems of insufficient frequency resolution and the inability to directly determine the vibration shape of the system frequency, so as to achieve strong engineering application value, easy implementation, Algorithm simple effect
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Embodiment 1
[0052] Purified acceleration signals reflecting various vibration forms of rail vehicles can be obtained by linear combination of the acquired acceleration signals. The following content of this embodiment describes in detail the purification methods of various vibration forms of rail vehicles. Various purification methods in this example can be used alone or in combination.
[0053] For a rigid body, there are three translations, three rotations and 6 degrees of freedom, which can be identified as stretching along the X-axis, lateral movement along the Y-axis, ups and downs along the Z-axis, rolling around the X-axis, and nodding around the Y-axis , Shake the head around the Z axis. Due to the mutual constraints between large components, rail vehicles generally cannot obtain independent lateral movement and rolling vibrations, but include five types of vibration forms: stretching, ups and downs, nodding, shaking heads, and rolling. Roll coupling gets. According to the posi...
Embodiment 2
[0084] This embodiment is an analysis of the vertical vibration characteristics of a certain high-speed detection train body, and obtains the frequency parameters of the main vibration forms of the vertical vibration of the vehicle and the phase relationship between the main vibration forms, which is the determination of the final parameters of the high-speed detection train. Provide evidence.
[0085] figure 1 It is a schematic flow chart of a method for analyzing the vibration form of a rail vehicle provided by the present invention, and is compared with the flow chart. The method comprises the steps of:
[0086] Step a: Obtain the rail vehicle acceleration response signal, the corresponding speed signal and the position information of the acceleration measuring point relative to the vehicle components.
[0087] In this embodiment, it is only necessary to analyze the vertical vibration of the high-speed vehicle body. Therefore, a vertical acceleration sensor is installed ...
Embodiment 3
[0100] The third embodiment is to analyze the lateral vibration form of the car body of a certain intercity EMU. On the basis of analyzing the shaking head and rolling vibration of the car body, the positions of the upper and lower center roll centers are further determined. The process of step a-step d in this embodiment is similar to that in embodiment two, and the sensor arrangement is as follows Figure 13 , The distance between the position of the side vertical sensor and the center line is 0.69m, and the sampling frequency is 1000Hz. This embodiment analyzes the shaking head and rolling vibration patterns.
[0101] In this embodiment, according to step c, the following results can be obtained for the combined acceleration: the car body shakes its head (see the acquisition part of the shaken head combined acceleration signal and Image 6 ), car body roll 1 (refer to the acquisition part of the roll and roll combined acceleration signal and Figure 9 ) and car body roll 2...
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