Vibration system and excitation method for thermal modal test of aircraft heated structure

Abstract

The invention belongs to the technical field of thermal modal tests of aircraft, and in particular relates to a thermal modal test excitation system and a test method thereof for a heated structure of an aircraft. One end of the high-temperature-resistant vibration excitation device of the system is suspended on a load-bearing beam by a metal braided rope Above, the other end of the high-temperature-resistant vibration device is connected to the bottom side of the test piece, the top of the test piece is suspended on the load-bearing beam through the suspension device, and quartz lamp heaters are arranged on both sides of the test piece; the test is as follows: simulation Free-free boundary conditions; hang the vibration excitation device on the beam, and connect the vibration excitation device to the test piece; install a thermocouple on the force sensor, input excitation vibration in the vibrator; continuously heat the test piece, During the heating process, the vibrator performs continuous excitation to complete the thermal modal test. In the thermal modal test, the test system and its test method can continuously and stably excite the test piece with a temperature up to 1200°C for a long time, and the boundary conditions of the test piece are not limited.

Description

technical field [0001] The invention belongs to the technical field of aircraft thermal modal tests, and in particular relates to an excitation system and a test method for thermal modal tests of aircraft heated structures. Background technique [0002] With the continuous development of gliding missile technology, the Mach number of aircraft flight is getting higher and higher, and the temperature of its key structures rises greatly under the action of aerodynamic heat. In order to study the dynamic characteristics of heated structures at high temperatures, it is necessary to carry out heating The thermal modal test of the structure in a high temperature environment, and a difficult problem that needs to be solved in the thermal modal test is to excite the test piece at high temperature and measure the magnitude of the excitation force. At present, there are mainly two ways to excite vibration in the existing thermal modal test, one is to use the hammer transient excitation...

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Problems solved by technology

[0003] Aiming at the disadvantages in the prior art that the aircraft is not resistant to high temperature, cannot continuously excite vibration, and the boundary conditions of the test piece are limited, the present invention provides an aircraft heated structure thermal modal test excitation system and its test method. The vibration system and its test method overcome the difficulties that the aircraft is not resistant to high temperature, cannot be continuously excited, and the boundary conditions of the test piece are limited. vibration, and the boundary conditions of the test piece are not restricted

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