Electromagnetic Hopkinson torsion bar test device

Abstract

The utility model discloses an electromagnetic Hopkinson torsion bar test device which comprises a power loading system, the power loading system comprises a plurality of motors and capacitors correspondingly connected with the motors through wires, and the capacitors are used for supplying power to the motors; the time sequence controller is used for controlling the capacitors to be started in sequence in a delayed manner; the Hopkinson torsion bar device is fixedly connected with one end of the motor, a plurality of capacitors are used for driving the electromagnetic induction motor to operate in a delayed mode to enable the motor to rotate in sequence, the effect of waveform superposition is achieved, and meanwhile signal strength can be improved by coherence superposition of a plurality of identical signal waves.

Description

Technical Field

[0001] The utility model relates to the technical field of experimental technology for dynamic mechanical properties of materials, and particularly relates to an electromagnetic Hopkinson torsion bar test device. Background Art

[0002] With the development of technology, the Hopkinson torsion bar technology at home and abroad has been continuously improving. Most of the improvements to the Hopkinson torsion bar technology focus on the loading method and fixture. The rise time and strain rate range obtained by different design methods are also different. The rise time of the explosion loading method is 5 - 10 μs, which is an ideal rise time, but it also has obvious disadvantages. Explosives are flammable and explosive items, which are relatively dangerous during storage and use, and the torsional wave is difficult to control. When a hydraulic system is used as the loading device, a large torsional force can be obtained. However, a large hydraulic supply system needs to be provided. The hydraulic system has a slow response, is difficult to accurately control, occupies a large space, has a high cost, and is difficult to maintain. Nie and Clause designed a direct impact loading method, which improved the controllability of the torsional wave and saved experimental time. However, this loading method will inevitably generate bending waves. The larger the required torsional wave, the greater the interference of the bending wave. Therefore, the difficulty of eliminating the bending wave is greater, it is difficult to ensure pure shear of the specimen, and at the same time, the bending wave will seriously interfere with the recording of the waveform, resulting in signal analysis errors. So, with the improvement of technicians, electromagnetic force loading is adopted, and by controlling the transient discharge of a large-capacity capacitor, the ultra-high-speed DC motor forcibly installed on the strengthened part of the torsion bar can be rotated instantaneously.

[0003] However, the waveform signal intensity obtained by the above single electromagnetic induction motor powered by a single capacitor is weak.

[0004] For the above reasons, it is necessary to improve the existing technology. Content of the Utility Model

[0005] I. Technical Problems to be Solved

[0006] Aiming at the above-mentioned defects existing in the prior art, the utility model particularly provides an electromagnetic Hopkinson torsion bar test device to solve the problems raised in the above background art.

[0007] II. Technical Solution

[0008] To solve the above technical problems, the utility model provides an electromagnetic Hopkinson torsion bar test device, including a dynamic loading system. The dynamic loading system includes a plurality of motors and capacitors correspondingly connected to the motors through wires. The capacitors are used to supply power to the motors;

[0009] A timing controller, which is used to control the capacitors to start sequentially with a time delay;

[0010] Hopkinson torsion bar device, and the Hopkinson torsion bar device is fixedly connected to one end of the motor.

[0011] In the above technical solution, the motor is an electromagnetic induction motor.

[0012] In the above technical solution, the capacitor is an IGBT absorption capacitor.

[0013] In the above technical solution, four motors are axially arranged, and the number of capacitors is the same as that of the motors and they are arranged in sequence from left to right.

[0014] III. Beneficial effects

[0015] Compared with the prior art, the present utility model has the following beneficial effects: the present utility model uses multiple capacitors to drive the electromagnetic induction motor to run with a time delay to make the motor rotate sequentially, achieving the effect of waveform superposition. At the same time, the coherent superposition of multiple identical signal waves can increase the signal intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural schematic diagram of the present utility model.

[0017] In the figure: 1 is a dynamic loading system, 2 is a Hopkinson torsion bar device, 10 is a motor, 11 is a capacitor, and 100 is a motor. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The following will further describe in detail the specific embodiments of the present utility model in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present utility model, but cannot be used to limit the scope of the present utility model.

[0019] Please refer to Figure 1 , the present utility model provides an electromagnetic Hopkinson torsion bar test device, including a dynamic loading system 1. The dynamic loading system 1 includes a plurality of motors 10 and capacitors 11 correspondingly connected to the motors 10 through wires 100. The capacitors 11 are used to supply power to the motors 10;

[0020] A timing controller, which is used to control the capacitors 11 to start sequentially with a time delay;

[0021] A Hopkinson torsion bar device 2, and the Hopkinson torsion bar device 2 is fixedly connected to one end of the motor 10.

[0022] In the above structure, the staff activates the timing controller to delay the control of the capacitor-powered motor, so that after the first motor is powered by the first capacitor and starts, the second motor is powered by the second capacitor and starts after a delay of 10-20 μs. The following motors follow the above sequence to start, achieving the effect of sequential impulse rotation, resulting in the waveform superposition of the signal wave. At the same time, when the signal waves generated by the same type of capacitor and motor are the same, the waveform coherent superposition plays a role in strengthening the signal.

[0023] Specifically, the motor 10 is an electromagnetic induction motor. Using an electromagnetic induction motor has the characteristics of high efficiency. At the same time, the electromagnetic induction motor has a simple structure, high reliability itself, and is not prone to failures.

[0024] Specifically, the capacitor 11 is an IGBT absorption capacitor. Using an IGBT absorption capacitor can withstand high pulse electricity, has self-healing properties, and a small ESR, etc.

[0025] Specifically, four motors 10 are axially arranged. The number of the capacitors 11 is the same as that of the motors 10 and they are arranged in sequence from left to right. The sequential arrangement of the capacitors and motors can increase the aesthetic appearance and make the visual effect not obtrusive. At the same time, the sequential arrangement of the motors can ensure the position correspondence between the motors, preventing the situation where the Hopkinson torsion bar device cannot be installed and used due to misalignment.

[0026] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. An electromagnetic Hopkinson torsion bar test device, characterized in that: include: A power loading system (1), the power loading system (1) comprising a plurality of motors (10) and capacitors (11) connected to the motors (10) via wires (100), the capacitors (11) being used to supply power to the motors (10); A timing controller, the timing controller is used to control the capacitors (11) to start up in sequence with a delayed start; and a Hopkinson torsion bar device (2), the Hopkinson torsion bar device (2) is fixedly connected to one end of the motor (10).

2. An electromagnetic Hopkinson torsion bar test device as claimed in claim 1, characterized in that: The motor (10) is an electromagnetic induction motor.

3. The electromagnetic Hopkinson torsion bar test device according to claim 1, characterized in that: The capacitor (11) is an IGBT absorption capacitor.

4. The electromagnetic Hopkinson torsion bar test device according to claim 1, characterized in that: The motor (10) is provided with four capacitors (11) in the axial direction, and the number of the capacitors (11) is consistent with the number of the motor (10) and they are arranged and distributed in sequence from left to right.

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