Triaxial Hopkinson rod synchronous dynamic calibrating apparatus and method of three-dimensional impact force sensor

Abstract

The invention relates to a triaxial Hopkinson rod synchronous dynamic calibrating apparatus and method of a three-dimensional impact force sensor. The triaxial Hopkinson rod synchronous dynamic calibrating apparatus and method of a three-dimensional impact force sensor are characterized in that a Y-axis transmission elastic rod and a Z-axis transmission elastic rod are respectively installed alongthe Y-axis and the Z-axis at the center of a one-dimensional split Hopkinson pressure bar system to form a true triaxial loading system. The triaxial Hopkinson rod synchronous dynamic calibrating apparatus and method of a three-dimensional impact force sensor has the advantages of generating dynamic loading in different direction at the same time, and performing triaxial calibration on the three-dimensional force sensor at the same time; avoiding the synchronism problem, of three-direction gas sources, too difficult to solve, ingeniously utilizing the transverse Poisson effect of the elasticplasmodium, performing dynamic sensitivity calibration under three-dimensional coupling of the three-dimensional force sensor; being able to perform high precision calibration on the dynamic linearityof the three-dimensional force sensor; and being able to perform single-axis or double-axis dynamic sensitivity calibration, being extensive in use, being simple in operation, being high in repeatability, and being high in accuracy and precision of measuring the dynamic linearity of an accelerometer.

Description

technical field [0001] The invention belongs to a calibration device and method for a three-dimensional impact force sensor, and relates to a three-axis Hopkinson bar synchronous dynamic calibration device and method for a three-dimensional impact force sensor, which is a true three-axis Hopkinson bar for multi-dimensional synchronous dynamic calibration of a three-dimensional impact force sensor Apparatus and methods. Background technique [0002] The three-dimensional impact force sensor can simultaneously detect the actual force of the object in the three-dimensional coordinate space. It is widely used in the fields of robot, engine, aviation and satellite testing. Its working condition must withstand the action of dynamic impact load, which affects the dynamic response rate and Sensitivity puts forward a higher application, so the multi-dimensional impact force sensor must be dynamically calibrated before use to ensure that its technical performance meets the requirement...

AI Technical Summary

Problems solved by technology

For example, the rotary table calibration devices proposed in Document 1 and Document 2 realize the dynamic calibration of the sensor in a specific frequency range, but the disadvantage is that it cannot perform three-dimensional synchronous calibration, and can only perform horizontal calibration in the X and Y directions and Z Vertical calibration in the direction, unable to decouple the three-dimensional force sensor between dimensions

At the same time, the standard force that can be generated by the rotary table calibration device is limited to 10 3 Below N, and the friction between the weight and the rotor has a great influence on the calibration accuracy

The method in reference 3, the Hopkinson rod device can generate shock pulses with different amplitude ranges, and can accurately calibrate the shock in a certain direction, but the use of a one-dimensional Hopkinson rod can only be used for dynamics in each direction of the three-dimensional impact force sensor. calibration, it is also impossible to obtain the cross dynamic sensitivity of the three-dimensional impact force sensor under the coupling effect between dimensions

2) The calibration device of the three-dimensional impact force sensor also has strong motion cross-coupling in the three axes

The decoupling device can not only transmit the standard force, but also have sufficient driving stiffness in the direction of force transmission, but also minimize its lateral limit constraints in the direction of non-force transmission, and also need to reduce the connection in the calibration device. The friction between the parts and the connected parts has high requirements on decoupling structure design, material selection and processing accuracy, and it is difficult to achieve

For example, the large-scale three-dimensional force sensor calibration loading platform disclosed in patent ZL201010103946.2 uses hydraulic cylinders to generate standard forces and can perform large-scale static calibration. The disadvantage is that it cannot solve the inter-dimensional motion coupling effect existing between hydraulic cylinders.

3) At present, the calibration methods of 3D force sensors are all focused on static calibration and dynamic calibration in a specific low frequency range, and the synchronous calibration method of dynamic sensitivity under impact load has not been reported yet.

Since the pulse width of the impact load is very short, the main difficulty is to ensure the simultaneity of the excitation signals in different dimensions, and it is necessary to design a complex multi-axis loading rod motion decoupling structure, which is currently difficult to achieve

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