Method for testing system-level trial run operation modes and operation deformation of liquid rockets
A working mode, liquid rocket technology, applied in the field of test analysis of rocket dynamics characteristics
Active Publication Date: 2015-02-18
BEIJING INST OF STRUCTURE & ENVIRONMENT ENG +1
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[0006] The purpose of the present invention is to make up for the deficiencies in the prior art, and to provide a new liquid rocket system-level test run mode and work deformation measurement and analysis method, which overcomes the current modal test method by manually applying excitation before the test run. The deficiencies in the test; through the low-frequency vibration response during the liquid rocket system-level test run, the modal parameters and working deformation are obtained by using the working mode and working deformation analysis method
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[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0028] A liquid rocket system-level test run working mode and working deformation test method, comprising the following steps:
[0029] Step 1, determine the measuring point; analyze the structural state of the whole system of the first stage of the liquid rocket core fixed on the test bench. The storage tank 13 and the tail section 14 are composed of four parts. Therefore, two rows of measuring points are symmetrically distributed on the rocket body. Connection with the test bench, such as figure 1 As shown, they are the top measuring point 16 of the upper fuel tank, the upper measuring point 17 of the inter-tank section, the lower measuring point 18 of the inter-tank section, the bottom measuring point 19 of the lower fuel storage tank, and the connecting position measuring point 110 of the rocket body and the test vehicle; The upper measuring point...
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The invention discloses a method for testing system-level trial run operation modes and operation deformation of liquid rockets. The method includes steps of determining measuring points; mounting sensors; constructing testing systems; debugging the testing systems; measuring data in trail run procedures; analyzing results and the like. The method has the advantages that kinetic characteristics of rocket body structures of the rockets in ignition states can be truly acquired, main low-frequency vibration characteristics of rocket bodies can be obtained by the aid of the few measuring points, and the multipurpose data are acquired and can be used for analyzing the operation modes, analyzing the operation deformation, formulating mechanical environments and the like.
Description
technical field [0001] The invention belongs to the field of test and analysis of rocket dynamic characteristics, and in particular relates to a liquid rocket system-level test run mode and a work deformation test method. Background technique [0002] In the early 1960s, the Raytheon series and Hercules series liquid rockets began to have low-frequency longitudinal self-excited vibrations. This self-excited vibration phenomenon of liquid rockets called "POGO" was mainly caused by the structural dynamics of the rocket and the liquid propulsion system. caused by dynamical instabilities caused by thrust-oscillating interactions. This phenomenon can be observed in the frequency range of a few hertz to a hundred hertz, depending on the size of the liquid rocket. The POGO vibration of the rocket will lead to the failure of certain instruments and structural damage on the rocket, and even lead to the failure of the mission. During manned flight, POGO vibration may cause the astro...
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IPC IPC(8): G01M99/00
Inventor 张永杰肖健赵威韦冰峰
Owner BEIJING INST OF STRUCTURE & ENVIRONMENT ENG