CAJ | 학술논문

零长弹簧作为高精度重力敏感器的核心元件，其温度场分布直接影响重力敏感器的测量精度，由于弹簧结构特殊，为了研究其传热特性，提出建立零长弹簧传热的等效模型。首先通过实验测得零长弹簧电阻温度系数，再设计实验测量零长弹簧的分段阻值变化来反求各段平均温度变化，通过最优化方法计算求解零长弹簧的温度分布曲线，结果表明，该曲线为幂函数曲线。为使零长弹簧可以用等长等直径的圆柱体来代替，利用Ansys进行仿真并建立了一个适于工程应用的导热系数随温度变化表格。仿真结果表明，该表格能够达到用圆柱体代替零长弹簧来研究其传热特性的目的，最大相对误差为2.8%。
령장탄황작위고정도중력민감기적핵심원건，기온도장분포직접영향중력민감기적측량정도，유우탄황결구특수，위료연구기전열특성，제출건립령장탄황전열적등효모형。수선통과실험측득령장탄황전조온도계수，재설계실험측량령장탄황적분단조치변화래반구각단평균온도변화，통과최우화방법계산구해령장탄황적온도분포곡선，결과표명，해곡선위멱함수곡선。위사령장탄황가이용등장등직경적원주체래대체，이용Ansys진행방진병건립료일개괄우공정응용적도열계수수온도변화표격。방진결과표명，해표격능구체도용원주체대체령장탄황래연구기전열특성적목적，최대상대오차위2.8%。
The zero-length spring is the core element of the high-precision gravimeter. The temperature distribution of the spring directly affects the measuring accuracy of gravimeters. For the sake of studying the heat transfer characteristic of the spring, an equivalent model of heat transfer of the spring was studied by considering its particular structure. The temperature coefficient of resistance was obtained by the experiment, and an experiment was designed to measure the resistance of different parts of the spring, so the average temperature change of every part was obtained. Then the curve of the temperature distribution was obtained from calculation by the means of an optimization method, and it is shown that the curve satisfies the power function. In order that the zero-length spring could be replaced by a cylinder with equal length and diameter, a simulation was made by Ansys software, and a thermal-conductivity vs. temperature table suitable for engineering application was built. The simulation results show that the cylinder can be replaced by the spring in studying its heat transfer characteristic, and the maximum relative error is 2.8%.