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Chassis Design of a Mobile Robot for Reducing Weight by Excluding Suspension Elements

Okada T., Mimura N., Shimizu T.

Journal of Automation Mobile Robotics and Intelligent Systems

2015

Vol. 9, No. 2

42--51

This paper proposes the design concept that prevents its total weight from increasing. The object of the methodology is to modify a conventional robot chassis for structural simplicity by composing the chassis from an elastic material so that it can reduce vibration and shock to the body. This idea makes it unnecessary to attach additional elements, such as suspension units; in addition, it means that it is possible to easily deform the chassis by forming long holes, and to decrease the total weight of the robot, even when the chassis is thick enough for functionality. It contributes to preventing the weight of the power source from increasing. Structural models for analyzing flexure of the chassis using the finite element method (FEM) are pursued. Also, dynamic behaviors of the chassis are clarified based on the modal analysis. The minor difference in error between the experimental and analytical data verifies that the models are useful in a practical application.

Development of a Stabilized Wideband Pendulum-Type Gravity Direction Sensor Utilizing Electromagnetic Clutch and Brake for Anti-Swing

Okada T., Tsuchida A., Mukaiyachi T., Shimizu T.

Journal of Automation Mobile Robotics and Intelligent Systems

2008

Vol. 2, No. 4

45-51

This paper proposes the usefulness of combining an electromagnetic clutch and brake with a pendulum for antiswing for developing a stabilized wideband pendulum-type gravity direction sensor. The pendulum-type sensor is high in response to direction change but liable to swing even when the change stops, in general. Therefore, anti-swing control without degrading sensitivity of direction measurement is important. Continuous damping of the pendulum motion causes an error in a stationary condition unless the pendulum is free from damping repetitively in an appropriate term. To develop a quick response direction sensor without error, we use a magnetic device. Based on motion analysis of a double pendulum, we simulate behaviours of the pendulum-type sensor by actuating the magnetic device by using different signals in form, frequency and magnitude. Also, we fabricate a motion simulator having two rotation joints to evaluate the anti-swing effect of the magnetic device. In the experiment we demonstrate that the device is beneficial for suppressing pendulum vibration over a wideband for measuring resultant direction of the acceleration compound with motion and gravity on such a platform moving randomly. Also, we show that a triangular signal is better than a sinusoidal signal for making the settling time short; however difference is within a narrow margin.