This paper reports on the analytical and experimental clarification of the possibility of measuring angular accelerations about two axes independently by the use of the Dynamically Tuned Dry Gyro (TDG) with the improved Rebalance Control Circuit (RCC).
First, direct and cross transfer functions relating outputs to inputs of the TDG were derived, taking into consideration the improvement of the RCC. It is then shown that the TDG functions efficiently as a sensor which is able to measure not only angular velocities but also angular accelerations about two axes simultaneously. Next, the hardware of each element of the RCC, which is necessary for the measurement of two-axis angular accelerations, was designed and manufactured, based on the parameters and figures of the TDG used in this study, and each manufactured parameter was adjusted properly. Third, electrical inputs were applied to the TDG, and the direct and cross transfer functions were measured experimentally. It was evident that the experimental results of direct transfer function which prescribes the performance of angular accelerations' measurement agree with the analytical solutions and are not influenced by the manufacturing accuracy of the RCC, but gain characteristics of cross transfer function, which correspond to the degree of measuring error of the angular accelerations, are significantly influenced by the manufacturing accuracy. Finally, it is concluded that measurement of two-axis angular accelerations is realizable through the use of the TDG and the RCC as mentioned in this paper, though there are many items which need further improvement in design and manufacture.