Measuring system and measuring method of mass, center of mass and moment of inertia of rigid body

Abstract

The invention provides a measuring system and a measuring method of mass, center of mass and moment of inertia of a rigid body, and the measuring system comprises a measurement control and analysis unit, a six degree-of-freedom motion platform, a six-component force sensor and a mounting platform, wherein the measurement control and analysis unit is used for controlling the attitude or the motion way of the rigid body by sending a motion signal to the six degree-of-freedom motion platform, and analyzing and calculating the mass, the center of mass and the moment of inertia of the measured rigid body according to the motion signal and force and torque sent by the six-component force sensor; the six degree-of-freedom motion platform is used for carrying out motion in the corresponding attitude or the motion way according to the received motion signal; the six-component force sensor is mounted on the six degree-of-freedom motion platform and used for obtaining the force and the torque received by the measured rigid body by acquiring measurement parameters; the mounting platform is fixed on the six-component force sensor and used for mounting the measured rigid body; and the six degree-of-freedom motion platform drives the measured rigid body to carry out the motion through the six-component force sensor and the mounting platform.The measuring system and the measuring method can realize the measurement of the mass, the center of mass and the moment of inertia, and have the advantages of simple steps and small errors.

Description

technical field [0001] The invention relates to the field of measurement technology, in particular to a measurement system and method for the mass, center of mass and moment of inertia of a rigid body. Background technique [0002] When performing performance calculations and dynamics simulations on vehicles or other mechanical equipment, parameters such as mass, center of mass position, and moment of inertia are often used. These parameters are necessary and critical for vehicle performance calculations and dynamics simulations. In the actual calculation and simulation, the estimation method is mostly used, but the estimated value may be much different from the real value, which directly affects the accuracy and authenticity of the calculation results. [0003] At present, the main method for measuring the mass and the position of the center of mass is the roll weighing method. This method has certain limitations in the form of measurement, the measurement result is single,...

AI Technical Summary

Problems solved by technology

The three-line pendulum, mass period method and spring resonance method have the problem of error caused by improper selection of measurement periods: if the number of measurement periods is too small, the accidental error of the obtained period will increase; if the number of measurement periods is too large, although it can be reduced The error of timing start and stop, but due to the greater influence of air resistance, the corresponding cycle will become longer, making the error of the measured cycle larger

In addition, when measuring the three-wire pendulum, due to the neglect of the influence of translational kinetic energy, there is a large error between the measurement result and the theoretical value, and there are also disadvantages such as cumbersome steps and more time-consuming

The spectrum analysis method obtains the natural frequency of angular vibration through spectrum analysis, and finally calculates the moment of inertia based on the natural frequency. This is an indirect test method with many intermediate links. Since the natural frequency obtained according to the spectrum analysis already has certain errors, Then the accuracy of the moment of inertia calculated by the final result is poor

[0005] In short, a technical problem that needs to be urgently solved by those skilled in the art is: how to provide a measurement method to realize the measurement of rigid body mass, center of mass and moment of inertia, and overcome the defects of cumbersome steps and large errors in the prior art

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