Series hydraulic cylinder with long stroke movement and short stroke high-frequency vibration

Abstract

The invention discloses a series hydraulic cylinder with long stroke movement and short stroke high-frequency vibration. The series hydraulic cylinder with long stroke movement and short stroke high-frequency vibration comprises a large hydraulic cylinder, a small hydraulic cylinder, a universal joint, a flange disc, a door truss and a cantilever truss. The large hydraulic cylinder is installed on the door truss through the universal joint. A piston rod of the large hydraulic cylinder is connected with an upper cover of the flange disc through a thread. A jacket of a cylinder body of the small hydraulic cylinder is connected with a lower cover of the flange disc. The cylinder bodies of the large and small hydraulic cylinders are vertical and arranged axially. A piston rod of the small hydraulic cylinder is connected with the end part of a small end of the cantilever truss. According to the series hydraulic cylinder with long stroke movement and short stroke high-frequency vibration provided by the invention, the piston rod of the large hydraulic cylinder travels upward to an appointed position and is locked, and the piston rod of the small hydraulic cylinder vibrates at high frequency and with small amplitude in the appointed position so that the series hydraulic cylinder can be matched in use with a longspan and large deflection truss test table to simulate dynamic deformation of wings in the process of take-off and flight of an airplane. The stroke and frequency response range of the series hydraulic cylinder with long stroke movement and short stroke high-frequency vibration are respectively dependent on the large and small hydraulic cylinders, and the series hydraulic cylinder with long stroke movement and short stroke high-frequency vibration has the advantages of simple structure, low cost, convenience in installation and maintenance, and agile combination manner.

Description

technical field [0001] The invention belongs to the field of mechanical technology, and further relates to a long-stroke movement and short-stroke high-frequency vibration serial hydraulic cylinder in the hydraulic technology field. The present invention can realize three kinds of practical functions by separately controlling the movement rules of large and small hydraulic cylinders in stages. The piston rod of the large hydraulic cylinder remains in the original position, and the piston rod of the small hydraulic cylinder vibrates at high frequency to realize the short-stroke high-frequency vibration function; the third is that when the piston rod of the large hydraulic cylinder is lifted up to a certain position, the piston rod of the small hydraulic cylinder vibrates at high frequency After realizing the large-stroke lifting movement to the designated position, a short-stroke high-frequency vibration is performed at the designated position. Its purpose is to be used in con...

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Problems solved by technology

The disadvantage of this patented technology is that, first of all, the method uses a 3-meter-long wing simulation board, which limits the length of the simulated wing and cannot simulate the wing of a large-span aircraft.

Secondly, this method uses a vibration table to drive the wing simulation board. Since the vibration table can only be excited by the foundation displacement, it can only simulate the vibration and deformation of the wing at the equilibrium position. Therefore, the vibration table cannot cause the wing simulation board to produce large deflection deformation and Simulate the dynamic deformation of the wing during take-off, and cannot effectively control the deformation of the wing simulation board

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