System and method for online measurement of vibration of solid rocket engine

Abstract

The invention discloses a system and method for online measurement of vibration of a solid rocket engine, and relates to the field of machining manufacture and optical measurement. The system performs measurement by employing a measuring module formed by a camera obscura and a blocking piece, the inner part of the camera obscura includes a light emitting diode array, a lamp box, and a linear array CCD sensor, different light-emitting brightnesses can be obtained through adjustment of the current of the light emitting diodes, the front surface of the lamp box is provided with a vertical slit, light emitted by the light emitting diode array can be changed to linearly polarized light through the vertical slit, the linear array CCD sensor is used for receiving the light emitted by the lamp box, and the goal of online measurement is finally achieved by optical signals received by the linear array CCD sensor. According to the system and method, inevitable defects of many conventional piezoelectric accelerometers are overcome, the measuring precision is radically improved, and the measuring efficiency is improved.

Description

technical field [0001] The invention relates to a solid rocket motor testing technology, in particular to a system and method for on-line measuring the vibration of a solid rocket motor, and belongs to the fields of mechanical processing and optical measurement. Background technique [0002] The system composed of the engine and the test frame will vibrate under the impact of the engine ignition and shutdown and the unstable combustion during the whole working process. When the vibration is severe, the structural strength of the engine and test equipment may decrease, cracks may occur in the propellant, and the equipment on the bomb may fail. This not only directly affects the working performance of the engine, but may even lead to the failure of the engine test and missile flight, so the vibration measurement in the engine test is very necessary. [0003] The vibration generated during the working process of the engine is basically random vibration. The amplitude and phas...

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Problems solved by technology

However, piezoelectric accelerometers also have some disadvantages. First, due to the small amount of charge generated, the generated signal is very weak and the output impedance is high, and the output DC response is poor. It is necessary to use a high input impedance circuit or a charge amplifier to overcome this problem. Defects; secondly, it is seriously disturbed by the electric field, and there is a charge accumulation effect. For continuous high-frequency shocks and charge accumulation effects, the piezoelectric accelerometer cannot respond continuously, and the output is saturated; again, due to the leakage phenomenon on the edge of the crystal, charge leakage will occur. Therefore it cannot be used for steady-state, static measurements

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