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Point frequency filtering method, device and system

A filtering device and point frequency technology, applied in impedance networks, digital technology networks, electrical components, etc., can solve problems such as difficulty in grasping the essential characteristics of objects, blindness in analysis and research processes, and increased difficulty, avoiding the Fourier transform. The effect of numerical analysis calculation

Inactive Publication Date: 2012-03-21
李军 +2
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Problems solved by technology

However, it is difficult to grasp the essential characteristics of the object through this time-domain analysis method, resulting in greater blindness in the analysis and research process
Finally, in the existing technology, the transformation of dynamic signals from the time domain to the frequency domain is mainly realized through Fourier series and Fourier transform, and the complicated calculation of Fourier transform increases the difficulty of the experiment

Method used

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  • Point frequency filtering method, device and system
  • Point frequency filtering method, device and system
  • Point frequency filtering method, device and system

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Embodiment Construction

[0030] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0031] figure 1 It is a flowchart of a point frequency filtering method of the present invention, comprising:

[0032] S101: setting preset frequency and preset bandwidth;

[0033] S102: Identify the step signal spectrum components included in the received test signal;

[0034] S103: Extract frequency signals from spectral components of the step signal under conditions of the preset number of frequencies and the preset number of bandwidths.

[0035] The step signal is one of the excitation signals often used in the field of control engineering. The various quality characteristics of the control loop can be judged through the step response, and the approximate parameter model of the object can also be identified through the step response. However, in the existin...

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Abstract

The invention discloses a point frequency filtering method, device and system. The method comprises: setting a pre-set number frequency and a pre-set number bandwidth; identifying step signal frequency spectrum components contained in an accessed test signal; and extracting frequency signals from the step signal frequency spectrum components under the condition of the pre-set number frequency and the pre-set number bandwidth. According to the invention, the step signal can be used as a data source in frequency domain analysis to separate and identify the frequency spectrum characteristic of step response data; on the premise that the bandwidth is infinitely small, a 'monochromatic' signal at a certain frequency point can be obtained; and furthermore, the frequency characteristic of a controlled target can be directly obtained by extracting and comparing frequency signals from the step excitation input and step response output signal frequency spectrum components of the controlled target, thus avoiding multifarious Fourier transform numerical analysis calculation and identifying the frequency domain characteristic of the system or the controlled target rapidly and effectively.

Description

technical field [0001] The invention relates to the technical field of industrial automatic control, in particular to a point frequency filtering method, device and system thereof. Background technique [0002] Applying excitation signal in the control loop to obtain the corresponding process response is the most widely used experimental analysis method and means in control engineering. Classical experimental methods mainly include step time domain analysis method with step signal as excitation, frequency domain analysis method with sine or cosine wave frequency signal excitation, etc. Time domain analysis is to describe the relationship of mathematical functions or physical signals to time, and frequency domain analysis is to describe the characteristics of signals in terms of frequency. For example, the change of signal strength over time belongs to the time-domain characteristic, and which single-frequency signals the signal is synthesized from belongs to the frequency-d...

Claims

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Application Information

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IPC IPC(8): H03H17/02
Inventor 李军万文军刘志刚
Owner 李军
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