Research on a Composite Micro-hose Subjected to Harmonic Loading. Experimental Approach

The article presents an original test rig for investigating the dynamic and static properties of hydraulic hoses. A composite micro-hydraulic hose with an inner diameter of 2 mm was taken as the test object. To carry out hydrodynamic tests in a composite hydraulic micro-hose, a test rig was built. The test stand consists of a hydraulic system whose purpose is to supply the test object with working fluid, and measurement paths that allow observation of hydrodynamic phenomena occurring in the tested hose. In addition, the test stand was equipped with a working fluid temperature stabilization system. The measured values during the measurement series were: pressure at the beginning and at the end of the tested hose (AC and DC components), temperature of the fluid inside the micro-hose at the beginning and at the end, vibrations in three directions at a selected point of the micro-hose, tension force of the micro-hose (DC and AC component), reaction in the supports (DC and AC component), fluid flow rate in the micro-hose, displacement of the movable support differential with the axial deformation of the micro-hose. In the research was determined the influence of the mean pressure value on the amplitude of micro-hose vibrations. Amplitude-frequency spectra were used to analyses the results obtained.