Calculation Method of Star-Arrow Six-DOF Interface Force Based on Strain Measurement of Star-Arrow Connecting Ring
A technology of strain measurement and calculation method, applied in the direction of measurement of force, force measurement by measuring the change of optical properties of a material when it is stressed, measurement device, etc., can solve problems such as weakening of strength and stiffness
Active Publication Date: 2016-08-17
SHANGHAI SATELLITE ENG INST
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Problems solved by technology
Although it is very direct to insert a piezoelectric force sensor between the launch vehicle and the satellite as a force measuring device, it is generally a point connection, which will change the original cylindrical continuous structure, resulting in weakening of strength and stiffness, and causing structural load-bearing. huge risk
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[0052] The present invention will be described in detail below in conjunction with specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all belong to the protection scope of the present invention.
[0053] The present invention calculates the method for the six-degree-of-freedom interface force of the star and arrow by measuring the strain of the star-and-arrow connecting ring. Multiple sets of measuring point groups are set at different positions of the star-and-arrow connecting ring, and each group consists of three (0°, 45°, 90°) Strain rosettes (or strain test optical fibers) measure the strains of the three measuring points respectively, which can be directly calculated by using the relevan...
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The invention provides a star arrow six-degree-of-freedom interface force computing method based on star arrow connecting ring strain measurement. Multiple measuring point sets are arranged at different positions of a star arrow connecting ring, in each set, three (0-degree, 45-degree and 90-degree) strain rosettes (or strain measurement optical fibers) measure the strain of three measuring points respectively, correlation formulas of mechanics of materials can be directly utilized for calculation, and the load-strain relation demarcated in a ground test in advance can also be used for predicting the actual interface load borne by the star arrow connecting ring by means of the structural linear elastic characteristic. A microprocessor accurately processes and records each calculation step and each measurement value in real time in the satellite launching period. According to the star arrow six-degree-of-freedom interface force computing method, the problem that the overall stiffness and strength are weakened due to the fact that force sensors are connected between the star arrows in series in the direct force measurement scheme is avoided, the weight of a measurement device is decreased by the adoption of strain measurement, and the effectiveness of the method is verified through simulated tests.
Description
technical field [0001] The invention relates to a method for calculating the six-degree-of-freedom interface force of a star and arrow, in particular to a method for calculating directly using relevant formulas of material mechanics, or predicting a star according to the linear elastic characteristics of the structure from the load-strain relationship calibrated in the ground test in advance. The method for the actual interface load on the connecting ring of the arrow, specifically relates to the calculation method of the six-degree-of-freedom interface force of the star and arrow based on the strain measurement of the connecting ring of the star and arrow. Background technique [0002] In order to ensure that the spacecraft and its subsystems and components can withstand the harsh dynamic environment of the launch phase and the power flight phase, sufficient dynamic environmental tests must be carried out on it. In the traditional acceleration-controlled vibration test, the...
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IPC IPC(8): G01L1/22G01L1/24
Inventor 张永涛王建炜杜冬周徐斌顾永坤
Owner SHANGHAI SATELLITE ENG INST