周期的熱入力を用いた室温変動にロバストな熱変形試験方法

抄録

In the development of large precise space structures, thermal deformation tests with high measurement accuracy are required. The conventional thermal deformation test conducted in atmospheric pressure is influenced by disturbances such as the change in room temperature and the thermal deformation of the jigs fixing the test article and measurement devices. The effect of room temperature can be eliminated through vacuum tests, but they require specialized measurement devices and the test results are influenced by the thermal deformation of the jigs. The authors proposed a thermal deformation test method using periodic heating. Sine-wave heating is applied to the test article and the test results are evaluated in the frequency domain. The effect of disturbance is eliminated if it occurs at a frequency with enough difference from the applied heating. This paper validates the elimination of the effect of the change in room temperature on the thermal deformation test using periodic heating. The validation was carried out through experiments using a truss structure and numerical analysis. The experimental and numerical results showed that effect of the change in room temperature was eliminated from the thermal deformation caused by the applied heating.