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In this paper, a scheme of obtaining the maximum theoretical overall efficiency is explored by optimizing the helix pitch profile of a TWT based on the collectability of spent beam. The detailed design of a Ku-band helix TWT is described according to three optimization goals (theoretical overall efficiency, theoretical collector efficiency and electronic efficiency). The simulation results indicate...
An approach using a physical-sensor difference and virtual-sensor difference based algorithm to visually and quantitatively confirm 3D lower limb posture was proposed. Three accelerometers attached on the hip, thigh and shank and two MAG3s (inertial sensor module) fixed on the thigh and shank were used to measure the accelerations and magnetic field data for the calculation of flexion/extension (FE)...
The problem of three-axis stabilization of a low earth orbiting drag-free satellite is addressed using model predictive control technics. This paper considers extending the current literature within this area through a suitable handling of exogenous disturbance model for the standard predictive controller. For low earth orbiting satellites the disturbances due to external environment are mainly from...
An approach using virtual-sensor difference and physical-sensor difference based algorithm to visually confirm lower limb posture was proposed and a wearable sensor system was developed. To explicate the lower limb posture, flexion/extension (FE) and abduction/adduction (AA) hip joint angles and FE knee joint angles were estimated for orientations of the lower limb segments, and the knee and ankle...
A new method for analyzing human segment three-dimensional orientation is presented. A wearable sensor system based on triaxial accelerometers alone was developed, and later was tested on a thigh to calculate the pitch and yaw angles of the thigh with the accelerations captured by the system. Wearing the developed system, eight volunteer subjects walked in the work space of a high-accuracy camera...
An original approach for ambulatory measurement and analysis of lower limb 3D gait posture was presented, and a wearable sensor system was developed according to the approach. To explicate the lower limb posture, thigh orientation angles were calculated based on a virtual sensor at the hip joint and double analog inertial sensors (MAG3) on the thigh; Knee joint angle in sagittal plane was calculated...
This paper presents a novel approach only based on triaxial accelerometers for three-dimensional (3D) orientation of lower limb segment during real-time motion. With two coaxially placed triaxial accelerometers, the actual resultant acceleration signals containing the acceleration of gravity and lineal movement along each axis were obtained. The angle displacements for orientation of each segment...
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