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Multichannel narrowband control algorithm for mechanical active vibration isolation

A technology of active vibration isolation and control algorithm, applied in the general control system, adaptive control, control/regulation system, etc., can solve the problems of extracting time-domain line spectrum, not involved, etc.

Active Publication Date: 2015-09-02
NAVAL UNIV OF ENG PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the time-domain controller of this patent does not involve how to extract the time-domain line spectrum from the time-domain reference signal and error signal, and does not involve the robustness of frequency fluctuation conditions

Method used

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  • Multichannel narrowband control algorithm for mechanical active vibration isolation
  • Multichannel narrowband control algorithm for mechanical active vibration isolation
  • Multichannel narrowband control algorithm for mechanical active vibration isolation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0136] A marine 200kW diesel generator set active and passive hybrid vibration isolation device is used as the implementation environment. Such as Figure 4 As shown, the acceleration sensor is installed on the foot of the upper machine, that is, 1 in the figure is used as a reference sensor; 6 acceleration sensors (1#~6# measuring points) are installed near the 6 hybrid vibration isolators on the base as error sensors, of which 2#, 4# and 6# measuring points are 5-1, 5-2 and 5-3, while 1#, 3# and 5# measuring points are installed on the other side of the unit symmetrical to 2#, 4# and 6# measuring points. The unit 2 weighs about 3.6 tons; it is supported by six magnetic levitation actuators-airbag active and passive hybrid vibration isolators 3 . When the unit is running, broadband and multiple line spectrum vibrations are excited, which is the primary vibration source; the magnetic levitation actuator 4 installed in the airbag vibration isolator is used as the secondary vib...

Embodiment 2

[0151] use Figure 4 The exciter 6 is used as the primary vibration source, and the voltage of the exciter is used as the reference signal, and the rest of the settings are the same as those in Embodiment 1.

[0152] The vibrator outputs 120Hz, 180Hz, 195Hz vibration.

[0153] The algorithm of the present invention was run, and the narrowband FxLMS algorithm was also run to compare the convergence speed.

[0154] Figure 8a , b, c provide the algorithm of the present invention, the convergence step size μ 1 The FxLMS algorithm, the convergence step size μ 2 = 1.5μ 1 Comparison of the error power convergence curves of the FxLMS algorithm controlling 120Hz, 180Hz, and 195Hz vibrations. It can be seen that the FxLMS algorithm (μ 1 ) convergence speed is much slower than the algorithm of the present invention, if the convergence step size is increased to μ 2 , then the FxLMS algorithm diverges rapidly in the initial stage. However, the algorithm of the present invention, u...

Embodiment 3

[0156] use Figure 4 The exciter 6 is used as the primary vibration source, and the voltage of the exciter is used as the reference signal, and the rest of the settings are the same as those in Embodiment 1.

[0157] The vibrator output sweeps the vibration from 107.5Hz to 112.5Hz, and the vibration whose frequency changes abruptly from 112.5Hz to 107.5Hz.

[0158] Run the algorithm of the present invention, apply / do not apply the phase difference compensator in the algorithm of the present invention, and compare the algorithm of the present invention with / without the phase difference compensator under the condition that the exciter outputs a sweep frequency signal from 107.5Hz to 112.5Hz and a frequency mutation active control effect. Such as Figure 9a , shown in b.

[0159] Figure 9a The sweeping speeds in b and b are 0.1Hz / s and 0.4Hz / s respectively, and each error power peak in the figure corresponds to a sudden change in frequency. From Figure 9a It can be seen t...

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Abstract

The invention relates to a multichannel narrowband control algorithm for mechanical active vibration isolation. A vibration sensor picks, close to a vibration source, reference signals, narrowband band pass filters of all frequency ranges that are divided in advance extract time domain line spectrum reference signals, a multichannel second-order filter operation is utilized to obtain reference signals that are filtered by secondary channel inverse models and that are used for self-adoptive control, and the convergence speed which is faster than the speed obtained by an FxLMS algorithm can be obtained while the stability is ensured. A phase difference compensator which only contains second-order parameters and enables on-line self-adaptive adjustment of the parameters to realized along with frequency fluctuations is in series connection behind the narrowband band pass filters, so no phase difference exists between the extracted line spectrum reference signals and the original reference signals prior to extraction. In this way, the optimal solution fluctuation of a controller caused by line spectrum frequency fluctuations is inhibited, and the robustness of the control algorithm for frequency fluctuations is improved. Through the multichannel narrowband control algorithm, the convergence speed is fast, the great frequency fluctuation robustness is exhibited, and control effects are great in mechanical vibration amplitude and frequency fluctuation conditions.

Description

technical field [0001] The invention relates to a multi-channel narrow-band control algorithm for mechanical active vibration isolation. Background technique [0002] Mechanical vibration contains rich and prominent line spectrum components. These line spectrum energy is concentrated and the amplitude is much higher than the surrounding frequency broadband noise, and the amplitude and frequency of each line spectrum will fluctuate with the mechanical operating conditions. [0003] The line spectrum of ship machinery has an important influence on ship radiated noise. Active vibration isolation technology of mechanical equipment has been paid more and more attention as an effective means of suppressing line spectrum. In order to achieve better line spectrum control effect, the active control algorithm of mechanical active vibration isolation needs to break through the following difficulties: (1) There are multiple Line spectrum vibration needs to be controlled, and the tradit...

Claims

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Application Information

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IPC IPC(8): G05B13/04
Inventor 何琳李彦帅长庚吕志强
Owner NAVAL UNIV OF ENG PLA
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