野球ボール型加速度センサの出力シミュレーションによる飛翔時の加速度の検証

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  • Verification of acceleration in flight of baseball-type accelerometer using its output simulation.

説明

<p>We formulate the acceleration at any point in a rigid body in translational and rotational motion in order to analyze the sensor output of a baseball-type accelerometer which consists of one sensor for low acceleration and three for high acceleration. On the basis of this formulation, we develop a simulator for the sensor outputs, and in particular this simulator includes the effect of temporal change in the angular speed and the axis of rotation. Comparison of simulated outputs with sensor outputs measured in flight experiments shows that the axis of rotation is moving slowly during its flight. Also, in order to estimate the aerodynamic force on the ball-type sensor, the translational acceleration along flight trajectory is investigated numerically by integrating the motion equations of the ball-type sensor. In the parameter study with the drag and lift coefficients, it is found that the amplitude and phase in the sensor outputs are affected in according to the aerodynamic coefficients. Furthermore, we attempt to estimate the aerodynamic forces acting on the ball-type accelerometer with the translational acceleration components of the sensor output. Then, it is shown that the components of the forces in the inertia coordinate system are obtained from the outputs of the low acceleration sensor.</p>

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