Sinusoidal pressure generation chamber with filter characteristics

Abstract

The invention relates to a dynamic pressure calibration device, and provides a sinusoidal pressure generation chamber with filter characteristics, which comprises a sinusoidal pressure chamber body with a main-assisted structure, wherein the two sides of the sinusoidal pressure chamber body are provided with an auxiliary sinusoidal pressure chamber and a main sinusoidal pressure chamber respectively; a mechanical filter is arranged in a communicated channel between the auxiliary sinusoidal pressure chamber and the main sinusoidal pressure chamber; the top and bottom of the auxiliary sinusoidal pressure chamber are grooved to form a first sensor mounting position and a second sensor mounting position respectively; the top and bottom of the main sinusoidal pressure chamber are provided with through holes to form an air inlet and an air outlet respectively; and the main sinusoidal pressure chamber part of the sinusoidal pressure chamber body with the main-assisted structure is fixed in a middle hole reserved on the middle part of a chamber support of which the top is provided with the air inlet and the bottom is provided with two first square holes and a second square hole. The device of the invention can eliminate the influence of higher harmonics, simultaneously reduce difficulties in mechanical machining, improve the accuracy of the mechanical machining and greatly improve the degree of distortion and dynamic-static amplitude ratio of sinusoidal pressure waveforms generated by a sinusoidal pressure generator.

Description

technical field [0001] The invention relates to a dynamic pressure calibration device, in particular to a sinusoidal pressure generating cavity with filter characteristics. Background technique [0002] In the measurement and calibration of the dynamic performance of pressure sensors and pressure measurement systems, the commonly used measurement and calibration equipment is a sinusoidal dynamic pressure calibration device. The sinusoidal pressure generator is the main component of the sinusoidal dynamic pressure calibration device. The fixed-volume variable-mass sinusoidal pressure generator is the most mature and widely used one, and the sinusoidal pressure generating cavity in the sinusoidal pressure generator is the core component of the fixed-volume variable-mass sinusoidal pressure generator. Existing sinusoidal pressure generating chambers are all single-cavity structures, which have the following disadvantages: (1) The inlet and outlet rotating disks will form refle...

AI Technical Summary

Problems solved by technology

The existing sinusoidal pressure generating chambers are single-cavity structures. This structure has the following disadvantages: (1) The inlet and outlet rotating disks will form reflected pressure waves, which will cause high-order harmonic distortion in the sinusoidal pressure chamber; (2) Low frequency Exhaust too fast at high frequency, and exhaust too slowly at high frequency, causing the shape of the pressure wave in the sinusoidal pressure chamber to be deformed, distorting the pressure waveform; If the ratio is too small, the relative ratio of electrical noise is too large, which will affect the measurement and calibration accuracy

[0004] The technical indicators of the entrance-modulated fixed-volume variable-mass sinusoidal pressure generator developed by NASA in the United States are: (1) Working frequency range: 100Hz~20kHz; (2) Static working pressure: 2MPa; (3) Maximum dynamic and static amplitude ratio: 153 %; (4) The frequency of the sinusoidal pressure waveform is greater than 5kHz and the distortion is large (no specific data is given)

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