Volume measurement method based on sound generating principle of piston
A technology of volume measurement and piston, which is applied in the field of volume measurement based on the principle of piston sounding, can solve the problems of not having complete sealing, and achieve the effect of wide application range
Active Publication Date: 2011-06-15
希蒙电子国际有限公司
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[0003] The purpose of the present invention is to propose a volume measurement method based on the principle of piston sound that solves the problem of measuring the volume of those cavities that have irregular shapes and do not have complete sealing
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[0011] The main components of the measurement system using the technology of the present invention are as figure 1 , which includes piston sounder 1, microphone 2, displacement adjustment structure 3, precision displacement sensor 4, volume adjustment piston chamber 5, volume adjustment piston 6, pressure equalization hole 7 and other main components, as well as auxiliary structures such as structural support and data acquisition and analysis system .
[0012] Piston sounder 1 produces sound pressure by repeatedly compressing the air in the cavity according to fixed frequency sinusoidal movement of the piston. It is best to customize a large-value piston sounder, which works at a fixed frequency between (1-200) Hz, and requires good performance. repeatability. Microphone 2 measures the sound pressure in the cavity and uses a high-sensitivity piezoelectric microphone. The volume adjustment piston cavity 5 is connected with the measured volume cavity, and the displacement adju...
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The invention belongs to the experiment testing technique, and relates to a volume measurement method based on the sound generating principle of a piston. A pistonphone is excited to work by the fixed frequency of 1 to 200 Hz, and a microphone is used for measuring the sound pressure in a cavity to be measured; the pistonphone is driven by a displacement mechanism to change the volume of the cavity to be measured; a displacement sensor is used for measuring the displacement of the pistonphone to obtain the change amount of the volume, and the sound pressure of the pistonphone in the cavity to be measured is measured for the second time; the above operations are carried out twice or more to obtain the known change amount of the volume (deltaVi) sequence and the corresponding sound pressure measurement values (pi) sequence; and the deltaVi and the sequence group are processed by least squares fitting to obtain the slope (a) and the intercept (b), and the total volume of the cavity to be measured can be calculated based on the slope and the intercept. Based on the principle that the magnitude of the sound pressure generated by the pistonphone is in inverse proportion to the internal volume of the cavity, the method can calculate the volume of the cavity by intentionally changing the volume to the known values and measuring the sound pressures generated by the pistonphone corresponding to different volumes.
Description
technical field [0001] The invention belongs to the experimental testing technology, and relates to a volume measurement method based on the sounding principle of a piston. Background technique [0002] The general length method is powerless for irregular cavity volume measurement, so people have designed various indirect measurement methods suitable for irregular cavity volume measurement, such as water injection weighing method, static pressure expansion method, etc., these methods They are all based on static measurement and have very high requirements on the airtightness of the cavity. Contents of the invention [0003] The purpose of the present invention is to propose a volume measurement method based on the principle of piston sound, which solves the problem of volume measurement of cavities with irregular shapes and no complete sealing. [0004] The technical scheme of the present invention is: the piston generator is installed on the measured volume cavity, so th...
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IPC IPC(8): G01F17/00
Inventor 杨军李程罗华峰王维
Owner 希蒙电子国际有限公司