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Traditional simulation methods are unable to meet the requirements of lunar takeoff simulations, such as high force output precision, low cost, and repeated use. Considering that cable-driven parallel mechanisms have the advantages of high payload to weight ratio, potentially large workspace, and high-speed motion, these mechanisms have the potential to be used for lunar takeoff simulations. Thus,...
To improve the 3D measurement accuracy of portable visual metrology using generic digital SLRs, deficiencies related to the traditional self-calibration model are analyzed, and a novel calibration method of generic digital SLRs is proposed. The collinear equations are established using the orientation angles of the targets, which are determined using a non-parameterized calibration platform. After...
Cubic prisms are commonly used to present pose and position of instruments in aerospace fields. Theodolites are used to get horizontal and vertical angles of cubic prisms by collimating. To improve the efficiency of collimating, an automatic collimation method for autocollimator was proposed based on a vision guidance system. A camera was used to get pose parameters of the aimed cubic prism according...
Linear motor has good performance and be able to realize high precision positioning. But, due to no transmission, damping ratio of the linear motor is too small. Then, the vibration cannot be well damped. To suppress linear motor vibration, a new control structure based on traditional cascaded PID control strategy is proposed in this paper. A new control loop is added to connect outer-loop with inner-loop...
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