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Extended Abstract A wheel dynamometer is used to measure dynamic load that is transmitted from the road surface to vehicles while driving. In this paper, a six-component (three forces and three moments) wheel dynamometer utilizing shear deformation was designed and evaluated. The cross type structure having four or six radial bars was used as a basic sensing structure of the wheel dynamometer. The body of the dynamometer consists of a rigid central hub, a rigid outer annular ring and the radial bars extending between the hub and the ring. Although most of sensors are mounted conventionally to provide an output signal indicative of bending strains in the sensing bar, other forms of sensors such as those that provide an indication of shear strains was used in this paper for obtaining more stable signal against inevitable location error at bonding strain gauges. One aspect of the load transducer includes a structure of placing flexural members which are compliant for displacement of each corresponding radial bars. The flexural members on the end of sensing bars in the annular ring serve to produce sufficient shear strain of the sensing bars which lie at 90 degrees, but they can provide non-uniform distributions of shear strain. Since there is a possibility that such a non-uniform strain distribution can cause mutual coupling errors between the forces or moments, deformation analysis is needed thereof. Finite element analysis was performed to design the shape including flexural members and determine the size of sensing parts, and to predict output signals. In order to obtain adequate output signal and minimize coupling errors, the locations of strain gauges and their connection were determined so that Wheatstone bridge circuits with four or eight strain gauges would be balanced. Through the design modifications of the various shapes of flexural members, the coupling effect was minimized. The maximum capacity of the six-component wheel dynamometer designed in this paper is 25 kN in each force Fx, Fy, 20 kN

Design and Deformation Analysis of Six-component Wheel Dynamometer