Excitation system of thermal mode testing of aircraft heating structure and excitation method thereof

Abstract

The invention, which belongs to the field of the thermal mode testing technology of the aircraft, particularly relates to an excitation system of a thermal mode testing of an aircraft heating structure and an excitation method thereof. The system is characterized in that one end of a high temperature-resistant excitation apparatus is hung at a force bearing cross beam by a metal braiding rope; and the other end of the high temperature-resistant excitation apparatus is connected with one side of a bottom of a testing element. The top of the testing element is hung at the force bearing cross beam by a suspension apparatus; and quartz lamp heaters are arranged at the two sides of the testing element. The testing is carried out by the following steps: a free-free boundary condition is simulated; the excitation apparatus is hung at the cross beam and is connected with the testing element; a thermocouple is installed at a force sensor and excitation is inputted into the exciter; the testing element is heated continuously and the exciter carries out excitation continuously during the heating process so as to complete the thermal mode testing. According to the testing system and the testing method, long-term excitation can be carried out continuously and stably on the testing element with the temperature of 1200 DEG C in the thermal mode testing; and the boundary condition of the testing element is 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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