Loading apparatus capable of sequentially applying impact load and steady-state load

Abstract

The invention discloses a loading apparatus capable of sequentially applying an impact load and a steady-state load. The loading apparatus is characterized by comprising a loading piston 1, an air cylinder 2, a pneumatic valve 3, an energy storage gas tank 4 and an inflating electromagnetic valve 5; the loading piston 1 is installed in the air cylinder 2, a connection way between a loading end ofthe loading piston 1 and a loading object 6 according to test requirements; the air cylinder 2 is connected with the energy storage gas tank 4 by virtue of the pneumatic valve 3, and a flow rate and flow of the compressed gas in the energy storage gas tank 4 towards the air cylinder 2 can be controlled; and the energy storage gas tank 4 can be connected with an external gas source by virtue of theinflating electromagnetic valve, wherein the volume V2 of the energy storage gas tank 4 is greater than the effective volume V1 of the air cylinder 2. By adopting the loading apparatus capable of sequentially applying the impact load and the steady-state load, the impact with speed can be simulated. Under the working conditions, the collision impact with speed can be simulated, a given acceleration space is reserved between the piston and a tested structure, the high-pressure gas is used to push the piston to move, i.e. the collision impact with the speed can be realized.

Description

technical field [0001] The invention belongs to the field of research and development of a special test loading device, which is used for the simulation of a special load loading form, and the quasi-stable load can be applied immediately after the impact load in time sequence. Background technique [0002] For some structures or system structures that unfold under impact loads and then bear static loads to realize their functions, such as adjustable nozzles of solid rocket motors and their installation structures, etc., the load forms are as follows: figure 1 As shown, the load can be divided into transient impact process and quasi-steady-state process. The transient impact process is generally on the order of milliseconds, and the duration of the quasi-steady-state process is usually several seconds. Before the bench ignition test or flight test, it is necessary to analyze or test the bearing capacity of the structure to ensure the safety of the structure during the test. ...

AI Technical Summary

Problems solved by technology

Due to the incompressibility of the fluid, the frequency response of this type of device is generally low, usually tens of Hz. If a higher response frequency is required, the flow rate needs to be increased, which is expensive

Images