Modeling method for telescopic vibration characteristics of arm support of straight arm type aerial work platform

Abstract

The invention discloses a modeling method for telescopic vibration characteristics of an arm support of a straight arm type aerial work platform when the straight arm type aerial work platform does telescopic motion. According to the method, a cantilever crane is segmented according to the combination condition and the section property between cantilever sections, and the whole cantilever crane isequivalent to a multi-cantilever-section variable-length cantilever beam with the end face provided with concentrated mass and rotational inertia. A Newton's second law is adopted to establish a motion differential equation of each arm section during telescoping, according to the boundary connection, a cantilever crane boundary condition and a transfer condition between the cantilever crane sections are obtained; a boom vibration mode at a series of moments by using a modal superposition method is colved; curve fitting is carried out on the relationship between the change parameters and the arm length; an actual vibration mode is replaced by approximation, a motion differential equation of each arm section is converted into a state space equation about generalized coordinates by means ofan orthogonal relation between the vibration modes and a Galerkin truncation method, and dynamic simulation is carried out under the environment of visual simulation software to obtain dynamic response of the head of the arm support. The method can provide theoretical reference for the telescopic vibration control of the boom.

Description

technical field [0001] The invention belongs to the field of mechanical dynamics and vibration, and in particular relates to a modeling method for the stretching vibration characteristics of a boom frame of a straight-arm aerial work platform. Background technique [0002] An aerial work platform is a kind of equipment that lifts personnel and equipment to a certain height for operation. Its boom is slender, so its dynamic performance must stand the test. However, on the one hand, with the increase of the working height in engineering practice, the length of the boom of the aerial work vehicle is getting larger and larger, and the slenderness is getting stronger and stronger. On the other hand, in order to reduce the quality of the boom, the boom is designed to be lightweight It will weaken its rigidity, both of which will make its dynamic performance worse, so the protection of the safety and comfort of people on the boom must be further enhanced, and the calculation accura...

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Problems solved by technology

[0003] Aiming at the deficiencies of the prior art, the present invention provides a modeling method for the stretching and vibration characteristics of the boom of the straight-arm aerial work platform, so as to solve the problem existing in the prior art that the parameter of the outer arm section replaces the overlapping area. Calculation error problem

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