Sensor Placement in a Hydraulic Drive System

Hydraulic drive systems consist of hydraulic and mechanical components, whose dynamic behavior is coupled by fluid-structure interaction. The validation of hydraulic drive models relies on an appropriate placement of pressure and vibration sensors. Based on a vibroacoustical approximation of the model, this question can be treated by potential and kinetic energy related modal assurance criteria (POTMAC and KINMAC). In this paper, the KINMAC criterion is applied for the sensor placement problem in a hydraulic drive system. The system consists of a valve block, a pipeline with fluid-structure interaction, a double-acting cylinder, and a mass attached to the piston. Modal analysis of a distributed parameter model is carried out for theoretical assessment of the sensor placement along the pipeline. The resulting mode shapes are used to calculate the auto-KINMAC matrix, which is expected to be diagonal. The same type of assessment is made with mode shapes from a modal test. Under the lim...