Manifold structure shows important effects on the velocity distribution among parallel microchannels. The bifurcation structure was adopted as the manifolds of microchannel array in a plane and a specific case was illustrated to estimate the effects of structural parameters on the velocity distribution using numerical simulation. Simulation result indicated that the velocity distribution appeared to be double W-shape, and somewhat symmetrical. In addition, the velocity values in each W-shape distribution also appeared symmetrical. It also indicated that two bifurcation channels from the same low-level bifurcation channel had different velocity values due to different singular losses. Larger microchannel length, smaller microchannel width or depth, larger RW or RL, suitable RZ were favor in obtaining relatively uniform velocity distribution among microchannels.
Excellent maintainability is extremely important not only supplementing reliability necessarily but reducing product life cycle cost and enhancing its quality greatly. Industrial experiences have shown that wear and friction related failures of tribological components, are one of the main reasons for maintenance. However, most of the research works evaluated tribo-maintainability at maintenance stages. This paper analyzed the tribo-maintainability related design factors from systematic perspective and concluded a more complete set of six factors. A fuzzy set based approach is then developed to quantitatively evaluate design for its tribo-maintainability. A case study with a common assembly of a gear reducer has demonstrated the effectiveness of the prototype developed.
In this paper, a novel solution combing heuristic constraints with physical-based method for virtual interaction is proposed. With which, a grasping simulation is divided into three stages including pregrasping, preliminary grasping and stable grasping and the two techniques have been used in different phases. A dexterous virtual hand, consisting of geometric model, kinematics model, collision model and contact force model, is also constructed to be used in this solution. By analyzing the physical structures and perceptual characteristics of human finger, a haptic rendering algorithm is presented to obtain natural and stable virtual interaction.
Educational robot is a platform of new educational technology. Student could study new knowledge in execution, and discover new things in exploration. It can enhance the ability of analyzing and solving problems. Orchestic robotic vehicle is designed to give the arrangement and innovation in educational robot platform. With the sensor, dance movements of each vehicle can run according to the route and coordinated motion. There is a major hardware platform which is Arduino, with ATmega328 chip of AVR microcontroller. A QTI line sensor and SHARP-GP2D12 infrared distance sensor are used in the design. Xbee wireless communication module is based on ZigBee technology which is low power network protocol of EEE802.15.4 standard. By researching and comparing several methods of control, this paper analyzes characteristics of them and the advantage and potential of development of synthetic control are testified. Choreography and coordinated control is realized for the dancing wheeled mobile robot scheme.
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