Research of the influence of operating characteristics of dampers on dynamic loads of the boom system

Abstract

The most effective operating characteristic of hydraulic damper that can be used in boom system
of mobile cranes for decrease dynamic loads during lifting a load from a rigid base is determined.
Research by numerical methods with a mathematical model describing transition processes arising
in boom system of mobile crane with electric drive during load lifting were conducted. The two-mass
dynamic model for estimation of the influence of different operating characteristics on dynamic loads was
built. It is describing the resisting force changing of hydraulic damper according to the three laws: linear,
progressive and regressive. The method of finite differences for model realization was used.
Dynamic stress loading of system by method of comparative analysis of curves of efforts,
displacements and velocities of reduced mass of boom system was estimated. It during load lifting
with snatching and applying a hydraulic damper with different operating characteristics is
determined that most effective is including in power circuit a load suspension of the damper with
regressive operating characteristic.