数値シミュレーションによる金属製反転ばねのオフライン設計法に関する研究

抄録

As a basis for establishing an off-line design method for an inverting spring used fbr pushbutton switches in electronic devices, a functional evaluation methodology in which the standardized S/N ratio was applied to the results of a numerical simulation of the force-stroke characteristic of the inverting spring was studied. A direct product array in which 1% internal noise was added to the control factor levels of the inner orthogonal array was allocated and a functional evaluation of the force-stroke curve was carried out using the standardized S/N ratio. By proper selection of control factor levels, a combination of control factors was found that reduced variations in the force-stroke curve due to internal noise. When the mean values of the force-stroke curve obtained from the outer orthogonal array allocation were used as standard conditions, reproducibility of the gain was improved as compared with the use of the force-stroke curve of the inner orthogonal array allocation as the standard condition. The optimum condition obtained from the evaluation by the standardized S/N ratio was then taken into consideration in tuning to the actual force-stroke curve,resulting in a combination of control factor levels that nearly matched the actual force-stroke curve.