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Fast and accurate gait phase detection is essential to achieve effective powered lower-limb prostheses and exoskeletons. As the versatility but also the complexity of these robotic devices increases, the research on how to make gait detection algorithms more performant and their sensing devices smaller and more wearable gains interest. A functional gait detection algorithm will improve the precision, stability, and safety of prostheses, and other rehabilitation devices. In the past years the state-of-the-art has advanced significantly in terms of sensors, signal processing, and gait detection algorithms. In this review, we investigate studies and developments in the field of gait event detection methods, more precisely applied to prosthetic devices. We compared advantages and limitations between all the proposed methods and extracted the relevant questions and recommendations about gait detection methods for future developments.
Huong Thi Thu Vu; Dianbiao Dong; Hoang-Long Cao; Tom Verstraten; Dirk Lefeber; Bram VanderBorght; Joost Geeroms. A Review of Gait Phase Detection Algorithms for Lower Limb Prostheses. Sensors 2020, 20, 3972 .
AMA StyleHuong Thi Thu Vu, Dianbiao Dong, Hoang-Long Cao, Tom Verstraten, Dirk Lefeber, Bram VanderBorght, Joost Geeroms. A Review of Gait Phase Detection Algorithms for Lower Limb Prostheses. Sensors. 2020; 20 (14):3972.
Chicago/Turabian StyleHuong Thi Thu Vu; Dianbiao Dong; Hoang-Long Cao; Tom Verstraten; Dirk Lefeber; Bram VanderBorght; Joost Geeroms. 2020. "A Review of Gait Phase Detection Algorithms for Lower Limb Prostheses." Sensors 20, no. 14: 3972.
Hydraulic accumulators are widely used in industry due to their ability to store energy and absorb fluid shock. Researchers have designed kinds of novel accumulators with better performance in these specific areas. However, the pressure in these accumulators decreases significantly when the fluid oil is continuously supplied from the accumulator to the hydraulic system. This limitation leads to a transient large pressure drop, especially in a small hydraulic system with varied working frequency. In this research, a combined piston type accumulator is proposed with a relatively steady pressure property. The gas chamber and the fluid chamber are separated by a cam mechanism. By using the nonlinear property of the cam mechanism, the nonlinear relationship between the pressure and the volume of the gas can be offset. Hence, the fluid pressure can be maintained in a relatively steady range. The defect of the traditional accumulator in the frequency varied system is analyzed in detail. Then, the structure of the new accumulator is proposed and modeled based on the traditional piston type accumulator. The mathematical equation of the cam mechanism is built under the assumption that the nitrogen gas works in an adiabatic process. A simulation system based on the Amesim platform is constructed, and mathematic equations of the system are given. Preliminary experiments are conducted to evaluate the performance of the new accumulator. The comparison results show that the adaptability of the new accumulator is obviously larger than that of the traditional accumulator in a frequency varied system.
Donglai Zhao; Wenjie Ge; Xiaojuan Mo; Bo Liu; Dianbiao Dong. Design of A New Hydraulic Accumulator for Transient Large Flow Compensation. Energies 2019, 12, 3104 .
AMA StyleDonglai Zhao, Wenjie Ge, Xiaojuan Mo, Bo Liu, Dianbiao Dong. Design of A New Hydraulic Accumulator for Transient Large Flow Compensation. Energies. 2019; 12 (16):3104.
Chicago/Turabian StyleDonglai Zhao; Wenjie Ge; Xiaojuan Mo; Bo Liu; Dianbiao Dong. 2019. "Design of A New Hydraulic Accumulator for Transient Large Flow Compensation." Energies 12, no. 16: 3104.