Abstract
The exponential increase of computational power has allowed the development of numerical simulation methods. Numerical simulation is widely used in the industries at all stages of the product development process: the design support, comparison between several solutions, final validation. Virtual prototyping and optimization methods enable to meet requirements from the first physical prototype. Hydraulic power transmission, which can be considered as a mature technology providing an unrivalled specific power, is widespread for Off-Road and On-Road vehicles. Nevertheless, this kind of technology has two identified weaknesses which are energetic efficiency and noise generated during the operation. In such a context, the proposed research project focuses on the modelling, the analysis and the simulation for a component set constituting a hydraulic transmission taking into account the flow and pressure ripples. Thus, this work deals with the modelling of fluid borne noise applied to a hydrostatic transmission. From the state-of-the-art on hydroacoustic spread laws, the paper introduces an original method for the modelling of the transition from frequency to temporal domain allowing an analysis of the unsteady behaviour of hydraulic systems. Then, this method is applied to characterize the hydroacoustic behaviour of a rigid pipe using a simulation software. Finally, the used experimental means are presented, as well as a correlation between real measurement and computational analysis applied for a rigid pipe.
Highlights
Hydraulic systems are widespread for off-road and on-road vehicles due to the mature technology reputation of hydraulic transmission providing an unrivalled specific power
The maximum pressure of the hydraulic power supply is 280 bar. This pump is connected to the test rig through a long distance of hoses and rigid pipe in order to attenuate the pressure ripples generated by the pump
When the mean flow rate is adjusted, the flowmeter can be shunted by a 3-way valve in the case where it is noted an impact of this sensor on the pressure ripples in the test rig
Summary
Hydraulic systems are widespread for off-road and on-road vehicles due to the mature technology reputation of hydraulic transmission providing an unrivalled specific power. A component assembly to form a whole hydraulic system or circuit (pumps/motors, pipes, hoses, valves, actuators, etc.) may, if it is poorly designed, spread and even amplify this pressure ripples. This fluid borne noise generates vibration at the interfaces and so is the cause of a part of noise emitted by the whole hydraulic system. In order to support in a suitable design of a hydraulic system, it is necessary to provide a way to predict hydroacoustic phenomena using modelling, analysis and simulation software This involves knowing the hydroacoustic characteristics of each component integrated in the hydraulic system which can be obtained either by measurements on test rig and/or by mathematical models. The paper will end by a comparison between measurements and simulation results in order to assess the prediction of this numerical model
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