A Cross-correlation Velocimetry Method Adapting to Object's Motion Characteristics

A technology of motion characteristics and motion characteristics, applied in the direction of using a device for measuring the time required to move a certain distance, can solve the problems of not being able to obtain measurement results, affecting the calculation rate, and not being able to intercept downstream disturbance signals, so as to improve computing speed, Precise speed of moving objects, reducing the effect of computation

Active Publication Date: 2019-10-01
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

When the measured speed changes greatly, the ideal downstream disturbance signal cannot be intercepted, which will affect the calculation rate and even fail to obtain correct measurement results.

Method used

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  • A Cross-correlation Velocimetry Method Adapting to Object's Motion Characteristics
  • A Cross-correlation Velocimetry Method Adapting to Object's Motion Characteristics
  • A Cross-correlation Velocimetry Method Adapting to Object's Motion Characteristics

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Embodiment Construction

[0037] The invention provides a cross-correlation velocity measurement method adapting to the motion characteristics of objects. Below in conjunction with accompanying drawing and example the present invention is described as follows:

[0038] 1. The distance between the two sensors arranged in front and behind the moving direction of the measured object is 0.2m. According to experience, the speed range of the measured object is within v 2=6.8m / s to v 1 =7.2m / s, determine that the initial transit time range is between 27.8ms and 29.4ms; wherein, the two front and rear sensors are sensors of a type related to measuring the characteristics of the measured object; for example, this embodiment is a speed sensor or a time sensor;

[0039] 2. The signal is acquired with two sensors at a sampling rate of 50 kHz.

[0040] 3. If figure 1 as shown, figure 1 is the sampled front and rear side sensor signals. According to the lower limit of the initial measured speed of 6.8m / s and t...

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Abstract

The invention discloses a cross-correlation speed measurement method adapting to object motion characteristics, belonging to the technical field of speed measurement. The method comprises the steps of respectively installing a sensor in the front and back of the motion direction of a measured object, determining a transit time range according to the speed range of the measured object, intercepting a signal sequence having the time length equal to that of signals of the front sensor for the sensor signals acquired by the back sensor from the beginning corresponding to the speed upper limit, and performing sparsification if the measurement precision requirement is low; then, normalizing the signals, intercepting the signal sequence, performing zero mean normalization, and introducing the signal sequence into the numerator of a cross-correlation function to obtain displacement corresponding to the peak; and finally, selecting a plurality of adjacent displacements for cross-correlation operation ahead and behind the displacement, obtaining a local curve of the cross-correlation function by using interpolating spline operation, and obtaining a transit time and a cross-correlation speed.

Description

technical field [0001] The invention belongs to the technical field of speed measurement. In particular, it relates to a cross-correlation velocity measurement method adapted to the motion characteristics of objects. Background technique [0002] With the advent of the industry 4.0 era, accurate real-time measurement of the moving speed of various moving objects in the industrial process has important practical significance for precise control and adjustment of production process parameters. [0003] The traditional cross-correlation algorithm has been widely used to measure the velocity of fluids and flat objects in the industry. It obtains the transit time by calculating the peak value of the cross-correlation function of the output signals of the two sensors arranged before and after the moving direction of the measured object. Then use the distance between the two sensors to get the movement speed. However, the accuracy and speed of the algorithm need to be optimized. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01P3/80
Inventor 钱相臣吴诗彤闫勇
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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