Small magnitude pulse force generation device

Abstract

The invention relates to a small magnitude pulse force generation device, and belongs to the dynamic mechanics measurement technical field. The small magnitude pulse force generation device uses compression gas to push a projectile to move upward in an air cylinder and generate pulse force stimulation in impact mode, and is composed of a bottom seat, a lifting rod, a guide rod, an air cylinder piston, an impact cylinder, the projectile, an anvil body, a buffer cushion layer, a dynamic force sensor, a mass block, a limiting mechanism and a support. The small magnitude pulse force generation device can obtain the pulse force stimulation different in magnitude and different in duration time by adjusting pressure of the compression gas, an initial position of the projectile, the mass of the anvil body and the mass block, and hardness and the thickness of the buffer cushion layer located below the anvil body. The small magnitude pulse force generation device is simple in structure and low in cost. The mass block can be directly installed on the dynamic force sensor and does not need an additional mechanism, and the mass of the mass block can be minimized, and accordingly the small magnitude pulse force stimulation within a range from 1kN to 10kN can be easily achieved.

Description

technical field [0001] The invention relates to a small-scale pulse force generating device, which belongs to the technical field of dynamic mechanical measurement. Background technique [0002] The impulsive force is a kind of dynamic force action that arouses the transient pulse motion of the system due to the sharp change of the force parameter in a short time interval, and causes the system to produce obvious momentum changes. one of the manifestations. In the fields of structural loading, component testing, crash testing, material testing, biomechanics and industrial automation control and monitoring in the technology industry, the measurement of small-scale pulse force is widely used. For example: the ejection force test of the pilot parachute jumping, the foot force of the athlete running (1kN ~ 2kN), the micromechanical contact force (within 1kN), etc. In order to meet the reliability of such test experiments, improve the processing level of industrial products, an...

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Problems solved by technology

However, affected by the asynchronous release moment when the hammer body falls, and the vertical friction force between the hammer body and the guide mechanism during the falling process, the lateral movement and friction force during the impact process will greatly affect the repeatability of the excitation force value. impact, and introduce a certain amount of lateral force; at the same time, limited by the mechanical structure such as the guide mechanism, the device is generally cumbersome, the mass of the falling hammer body is large, and the pulse force value generated by the impact is also large, such as the 1MN dynamic force of the Chinese Academy of Metrology Standard device

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