Method to Define the Remaining Life Time of High-Pressure Hose of Forest Machines

Introduction. Definition of remaining life time of high-pressure hose, the fault of which is of sudden nature, is one of the topical technical problem, intended to improve the reliability of performance of hydraulic drive of forest machines. This problem is not solved to the full and it is required to improve the diagnostic technique of current condition of high-pressure hose. The goal of the research is to improve the efficiency of forest machines operation due to failure prediction and full employment of resources of the parts of hydraulic drive. High-pressure hoses of forest machines (Forwarder 1910F, Finnish production), exploited in summer and winter in Priluzhskiy district of the Komi Republic were chosen to be the object of the research. Results. The experimental researches to define the mode of vibration, arising when their dynamic loading, were carried out. It was demonstrated that the oscillating process coming from the resonance state of a pipeline arose under certain pressure of loading in the pipeline. In this regard, free frequency of pipeline with liquid was chosen as a testing parameter, dependence on the cycles of dynamic loading was determined, frequency function of failure distribution was found, a method to define probability of failure of the parts of hydraulic drive was offered. The method allows to determine the remaining life time of the parts of hydraulic drive. Free frequency of pipeline with liquid was taken as a testing parameter , describing technical condition of high-pressure hose . Conclusion. The formula of probability of failure of pipeline in summer and winter was derived. It was shown that loss of life of high-pressure hose at low temperatures is explained with the peculiarities of rubber properties it is made of.