A Fundamental Study Of Measuring An Overall Direction-of-action Using A Suspended Weight

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This paper describes a sensor for the measurement of overall direction-of-action in 3-D space. The sensor uses a spherical heavy weight suspended by springs, without lateral distortion of the springs. When a platform on which the sensor is attached accelerates by an external force, the weight moves toward the direction from which a resultant direction of motional and gravitational accelerations are obtained. Displacement of the sphere is in proportion to the magnitude of the acceleration. Four small magnets are installed on the surface of the sphere so that the displacement can be measured using Hall Effect devices. In order to evaluate total stiffness and natural frequency of the suspended weight, behavior of the weight is analyzed. Experimental results show that measurement error is within 5.8" in all directions of gravity.

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