Comparison type calibration method for dynamic measurement system

A calibration method and dynamic measurement technology, applied in the field of data correction, which can solve the problems of inconsistent speed sources, inability to measure values, transmission and traceability, etc.

Inactive Publication Date: 2012-07-25
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The calibration of the electronic radar speed measurement system can use the standard speed measurement area interception device (light curtain target) or a higher-precision electronic radar speed measurement system, but no matter how the existing calibration method is adopted, the sp

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  • Comparison type calibration method for dynamic measurement system
  • Comparison type calibration method for dynamic measurement system
  • Comparison type calibration method for dynamic measurement system

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0040] Example 1.1

[0041] combine figure 1 , this example corrects the data of the comparison calibration of the dynamic pressure measurement system based on the drop weight, and the specific implementation steps are as follows:

[0042] 1) as figure 1 As shown in the figure, the drop-weight hydraulic dynamic marking device consists of a piston, a precision piston cylinder, a relief valve, an oil cylinder body, etc. Four standard sensors (I, II, III, IV) and two sensors to be marked are installed around the precision piston cylinder. (X, Y). The free-falling weight converts the gravitational potential energy into kinetic energy, and then collides with the precision piston at the top of the oil cylinder. The liquid in the oil cylinder is compressed by the piston to generate pressure in the oil cylinder, thereby converting the kinetic energy of the weight into the elasticity of the hydraulic oil volume deformation. potential energy. When the kinetic energy is fully convert...

Example Embodiment

[0051] Example 1.2

[0052] The data of the comparison calibration of the dynamic pressure measurement system based on the drop weight is corrected. The experimental device is still the drop weight hydraulic dynamic standard device. Two standard sensors and a compared sensor Z are installed around the precision piston cylinder. According to the above experiment The experimental data and processing results are shown in Tables 4 and 5.

[0053] Table 4 Dynamic calibration test data

[0054]

[0055]

[0056] Table 5 Evaluation of pressure data measurement results

[0057]

[0058]According to the calculation of 4 data, there is an obvious deviation between the pressure sources monitored by the standard sensor for many times during the calibration, and the maximum deviation is 0.005, indicating that the pressure source is unstable during the actual calibration, so the uncertainty caused by the repeated measurement cannot be carried out. Evaluation, after the correction...

Example Embodiment

[0060] Example 2.1

[0061] The 4 pairs of standard speed measurement area interception devices (referred to as standard light curtain targets) and a school electronic radar dynamic speed measurement system device are in accordance with the figure 2 Symmetrical arrangement as shown, it is assumed that the distance between the two targets of the intercepting device I is L1, the distance between the two targets of the intercepting device II is L2, the distance between the two targets of the intercepting device III is L3, and the distance between the two targets of the intercepting device IV is L4 , the electronic radar speed measurement system device to be schooled is placed in the intercepting device, the distance between the car and the first target is Lq, according to the principle of average speed measurement, the measured value of the moving speed of the car measured by each intercepting device is v i : Among them, l1=50m, l2=65m, l3=75m, l4=85m, Lq=100m. The test site us...

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Abstract

The invention discloses a comparison type calibration method for a dynamic measurement system, wherein a standard transducer and a calibrated transducer are used for comparison and calibration testing, the standard transducer and the calibrated transducer are arranged together, so as to measure a same physical quantity simultaneously, and then the uncertainty caused by the repeatability of the dynamic measurement system is assessed by a statistical analysis method. The scheme of the invention is widely used, is easy to operate and can ensure the uniformity of calibration test dynamic sources at different times.

Description

technical field [0001] The invention belongs to the field of dynamic measurement and calibration, in particular to a data correction method for keeping a standard dynamic source stable during comparative calibration of a dynamic measurement system. Background technique [0002] Before the dynamic test, the dynamic test system generally requires dynamic calibration, but due to the lack of a stable standard dynamic source, the standard value is inconsistent every time the calibration is performed, and the uncertainty caused by the repeatability cannot be eliminated by repeated measurement with equal precision. degree is assessed. [0003] For example, the pressure of the piston cylinder must be measured in the development, finalization, production, and inspection of various piston-type mechanical devices. At present, the pressure measurement system based on piezoelectric sensors is generally used to measure the pressure of the piston cylinder. In order to accurately measure t...

Claims

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Application Information

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IPC IPC(8): G01D18/00
Inventor 狄长安孔德仁闵想孟祥明王芳贾云飞商飞
Owner NANJING UNIV OF SCI & TECH
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