In this paper, the effects of uncertain factors in the thermistor pasting technology are researched using parameter sensitivity analysis method. The relevance between thickness of electrical insulating tape, contact interface area, thermal contact conductance and thermal time constant is analyzed, and sensitivity classification of uncertain factors is done by the absolute/relative variation of thermal time constant. Research shows that 1) thickness of electrical insulating tape dPI and thermal contact conductance ht are the insensitive parameters about thermal time constant in the surface pasting technology, relative sensitivity indexes are 0.169[s0.5/μm0.5] and 0.292[m·s0.5·K0.5/W0.5] respectively; 2) contact interface area At is the sensitive parameter about thermal time constant in the surface pasting technology, absolute variation and relative sensitivity index is 124.6s and 3.530[s0.5/mm] separately; 3) in addition to the high-precision calibration, filtering the sensitive-bead size and contact interface area strictly are also critical for improving the real-time measurement accuracy and temperature-changing response speed of thermistors.
In this paper, the three-dimensional calculation model of 1/72 LSII submarine is established by finite volume method, and combining frame motion, user-defined function and polynomial profile, the simulation of propeller rotation and temperature-density stratified seawater are realized. Based on this model, the effects of diving depth, sailing speed and wake velocity on cold-thermal wake characteristics are analyzed. The conclusions are as follows. 1) Considering the temperature-density stratified seawater is a sufficient and necessary condition for simulating the cold-thermal wake characteristics of submarine. 2) Submarine perturbs the low-temperature seawater to form the cold wake, then the cold wake and the thermal wake are superimposed to form the cold-thermal wake characteristics in downstream sea-surface. 3) Cold wake characteristics of upstream sea-surface are related to the diving depth directly, but aren’t related to the sailing speed and wake velocity. The contents above could provide reference for the high-precision simulation of submarine’s cold-thermal wake characteristics.
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