High-precision dynamic pressure measurement method and system with long-term stability

A dynamic pressure measurement and stability technology, which is applied to the simultaneous measurement of multiple hydraulic valves, measurement devices, and fluid pressure measurement. It can solve the problems of small measurement range and achieve long-term stability, high precision, and low cost.

Inactive Publication Date: 2021-03-16
CHENGDU KAITIAN ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0030] This small-range differential pressure sensor adopts the principle of heat flow penetration, has low pressure difference, low drift, high precision performance, excellent long-term stability, but the measurement range is small

Method used

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  • High-precision dynamic pressure measurement method and system with long-term stability
  • High-precision dynamic pressure measurement method and system with long-term stability
  • High-precision dynamic pressure measurement method and system with long-term stability

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0099] A high-precision dynamic pressure measurement method with long-term stability, such as figure 1 As shown, it includes a large-range differential pressure sensor and a small-range differential pressure sensor, and the precision and long-term stability of the small-range differential pressure sensor are high; the range of the large-range differential pressure sensor covers the dynamic pressure measurement range.

[0100] When Qc1 is close to 0Pa, calculate the zero position deviation b of the measured dynamic pressure Qc2 of the large-range differential pressure sensor:

[0101] b=Qc1-Qc2

[0102] When Qc1 is close to the range end value of the small-range differential pressure sensor, calculate the error correction slope k of dynamic pressure Qc2:

[0103]

[0104] When the dynamic pressure Qc is within the measuring range of the small-range differential pressure sensor, the measured dynamic pressure Qc1 of the small-range differential pressure sensor is the real dy...

Embodiment 2

[0109] This embodiment is optimized on the basis of Embodiment 1. When |Qc1|≤495Pa, then Qc=Qc1; when |Qc1|>495Pa, Qc=k×Qc2+b. like figure 2 As shown, the dynamic pressures Qc1 and Qc2 are collected by the small-range differential pressure sensor and the large-range differential pressure sensor respectively. When |Qc1|≤495Pa, Qc1 is used as the real dynamic pressure, and Qc=Qc1; The real dynamic pressure has Qc=k×Qc2+b.

[0110] Further, when |Qc1|≤5Pa, calculate the zero position deviation b of the measured dynamic pressure Qc2 of the large-range differential pressure sensor.

[0111] The invention adopts the differential pressure sensor without time drift to realize the real-time automatic correction of the differential pressure sensor with time drift. The correction is realized automatically without manual intervention and regular maintenance of the atmospheric data measuring device, which greatly improves the equipment. maintainability.

[0112] Other parts of this emb...

Embodiment 3

[0114] A high-precision dynamic pressure measurement system with long-term stability, such as figure 1 As shown, it includes a small-range differential pressure sensor, a large-range differential pressure sensor and an acquisition and correction module arranged in series on the total pressure pipeline, and a static pressure pipeline is arranged between the small-range differential pressure sensor and the large-range differential pressure sensor , the small-range differential pressure sensor and the large-range differential pressure sensor are connected to the acquisition and correction module respectively; the precision and long-term stability of the small-range differential pressure sensor are relatively high; the range of the large-range differential pressure sensor covers dynamic pressure measurement scope.

[0115] The present invention is based on the performance indicators and long-term stability characteristics of various differential pressure sensors, and is obtained ...

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Abstract

The invention discloses a high-precision dynamic pressure measurement method and system with long-term stability. The system comprises a wide-range differential pressure sensor and a small-range differential pressure sensor. The range of the wide-range differential pressure sensor covers the dynamic pressure measurement range. When Qc1 is close to 0Pa, the zero deviation b of the measurement dynamic pressure Qc2 of the wide-range differential pressure sensor is calculated; when Qc1 is close to the range end value of the small-range differential pressure sensor, the error correction slope k ofthe dynamic pressure Qc2 is calculated; when the dynamic pressure Qc is within the measurement range of the small-range differential pressure sensor, the measurement dynamic pressure Qc1 of the small-range differential pressure sensor is the real dynamic pressure, namely Qc = Qc1; otherwise, the real dynamic pressure is obtained by correcting the dynamic pressure Qc2. Measurement configurations ofthe small-range differential pressure sensor and the wide-range differential pressure sensor are constructed, and through cooperative work of the small-range differential pressure sensor and the wide-range differential pressure sensor, measurement precision and long-term stability within the dynamic pressure full-pressure range are achieved.

Description

technical field [0001] The invention belongs to the technical field of atmospheric data measurement, and in particular relates to a long-term stable high-precision dynamic pressure measurement method and system. Background technique [0002] The air data system uses the principle of measuring air pressure to measure the altitude, speed and other parameters of aircraft, helicopters, missiles and other aircraft in real time. The air data system is the key safety equipment of the aircraft and belongs to the aircraft avionics system. The control system, integrated fire control system, and aircraft engine control system provide important navigation and flight control parameters, and are indispensable and important systems that affect aircraft flight safety and realize autonomous navigation. [0003] The air data system realizes the calculation of atmospheric parameters such as air pressure altitude, indicated airspeed, Mach number, true air speed, and ascending and descending spe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L15/00
CPCG01L15/00
Inventor 杨德祥粟强何恩祥
Owner CHENGDU KAITIAN ELECTRONICS
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