Multi-Degree-of-Freedom Active Seat Suspension for Ultra-Compact Mobility

(Analytical Consideration on Control of Two-Degree-of-Freedom Vibration Using Linear Actuators)

Abstract

　In recent years, demand for ultra-compact mobility has increased due to environmental issues and an aging society. Because of their light weight and compact size for one or two passengers, vibrations from the road surface are easily transmitted to these vehicles, resulting in a deterioration of riding comfort. It is also known that the vibration input from the road surface occurs in various directions, such as vertical and pitch, and that the ride quality perceived by the occupants differs depending on the direction of the vibration. In this report, an active seat suspension system that controls multi-directional vibration by installing an actuator under the seat of a vehicle is proposed. A control method to design the vibration frequency characteristics in the vertical and pitch directions separately is also discussed.