水道管励振用アクチュエータの電気機械連成モデル化と1D-CAEを用いたシミュレーション

抄録

Water pipes installed during Japan's rapid economic growth period have deteriorated, resulting in frequent ruptures and leaks. However, it is difficult to identify such before accidents, and maintenance is performed only after the fact. An author had already proposed a vibration sensing actuation device to monitor the water pipes in real time. In this paper, for quantitative evaluation of the vibration speaker used in the device, modeling of the vibration speaker and analysis using 1D-CAE were conducted. For the modeling of the vibrating loudspeaker, the frequency response function of the acceleration of the vibrating part to the input voltage was experimentally obtained. Three models were considered, and an algorithm was proposed to identify the parameters of the models. The modeling was performed based on the identification algorithm, and it was confirmed that the model ignoring the inductor in the circuit was faithfully modeled. The model analysis using 1D-CAE was performed using OpenModelica. In particular, this paper focuses on the force frequency characteristics of a vibrating loudspeaker. The analysis confirmed that the force characteristics have a gain in the low frequency range, and that the characteristics change with the presence or absence of an inductor in the high frequency range.