Vertical state and structurally simple modal test system

Abstract

The invention relates to the missile and launch vehicle dynamic characteristic measurement technology, and particularly relates to a vertical state and structurally simple modal test system. The system comprises a measurement device, a pulse excitation device and a temporary measurement chamber. The measurement device comprises a capacitive acceleration sensor, a sensor base and a sensor cable. The capacitive acceleration sensor is mounted on the sensor base. The sensor base is connected with the surface of a test piece. A waterproof protective film is respectively coated on the capacitive acceleration sensor and the sensor base. One end of the sensor cable is connected with capacitive acceleration sensor, and the connection part of the sensor cable and the capacitive acceleration sensor is coated by the above waterproof protective film to be sealed by a heat-shrinkable tube. The other end of the sensor cable is provided with a signal line connector and a power line connector. The signal line connector is connected with the measurement system of the temporary measurement chamber. The power line connector is connected with the power supply device of the temporary measurement chamber. The pulse excitation device is arranged along the main vibration direction of the test piece. According to the technical scheme of the invention, the system is strong in environment adaptability and can be applied to the field operation of large ambient temperature and humidity change range.

Description

technical field [0001] The invention relates to the technical field of dynamic characteristic measurement of missiles and launch vehicles, in particular to a simple modal test system for erected state structures. Background technique [0002] At present, the structural dynamic characteristic test is a routine and important link in the product development process. The general purpose of the test is to assess the dynamic characteristic parameters of the structure in the real state of the product. The frequency, mode shape and damping parameters of the product in the test state are used as a reference for the design of the ground network of the product general inspection control system; the frequency, mode shape and damping parameters of the product in the state of the launch area are used for checking the vertical load calculation, the calculation of the initial Q value of take-off, and Ground aiming design for use. [0003] With the development of domestic related test techn...

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Problems solved by technology

[0014] The technical problem to be solved by the present invention is to solve the problem that the existing measurement system installation form cannot meet the environmental adaptability requirements due to the long time span of the test state of the dynamic characteristics of the erected state structure, the test environment, high humidity, large temperature range, and complexity. question

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