The air conditioning compressor-piping system operates under varying load conditions for an extended period, leading to fatigue damage in the piping, which can fail the entire air conditioning system. Therefore, fatigue life analysis of the air conditioning compressor-piping system is crucial in its overall development. To more accurately estimate the fatigue life of the air conditioning compressor-piping system under varying conditions, a fatigue life prediction method is proposed. This method involves loading the identified compressor load time history into a finite element model in ANSYS, conducting time history analysis to determine the fatigue critical nodes, obtaining stress spectra and fatigue characteristic curves (S-N curves) for these critical nodes, and predicting the fatigue life using the three-parameter rainflow counting method and the Miner cumulative damage theory based on acceleration factors. Additionally, strain signals are collected in the vicinity of the critical nodes to calculate fatigue damage. Through experimentation and simulation, the analysis results reflect the fatigue life of the air conditioning compressor-piping system within a certain margin of error.
To meet the need of long distance transmission in low turbidity measurement system for low-loss, a new optical structure with wavelength 1310nm and 1550nm as the incident light is employed. In this research, experiments have been done for different optical length of the two wavelength light sources. The results show that: first, the transmitted light intensity has big difference under the circumstance of same concentration and optical length, though the loss has no remarkable difference transmitted in optical fiber between 1310nm and 1550nm. Second, the optimized optical length for better absorbance has been determined for 1310nm and 1550nm and it is irrelevant to the incident intensity. Third, the intensity of the two transmitted light decreases exponentially with the increase of optical length. For example, when the range of the optical length of 1310nm is 0.5mm-2mm, the transmitted intensity is about 60%-79% and the absorbance is 0.12-0.42. The transmitted intensity is about 5%-44%. When the range of the optical length of 1550nm is 0.5mm-2mm and the absorbance is still 0.12-0.42. Our experimental data provides the basis both for the optical length selection of these two light sources in water and the near-infrared spectral wavelength selection.
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