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Division of optical force into gradient force and scattering force is a decades long problem. The concepts of “gradient force” and “scattering force” are very commonly applied in the interpretation of optical trapping simulation and experiment, but no one has seen their true face except for a few special cases. Such a division is important because the gradient force is responsible for optical trapping,...
For satellite servicing, it is necessary to remove a patch of multi-layer insulation (MLI) that covers the access panel. We consider the case where this patch is secured by tape and desire to use ground-based teleoperation to carefully cut the tape on three sides of the patch. Communication delays of several seconds motivate the development of an online method to enable failure detection by the remote...
This paper present a new design of a Limited angle torque motor (LATM) with Dual Halbach Arrays for rotary direct drive valve (DDV), which needs high frequency response, high power to weight ratio. Reluctance model of proposed LATM is discussed. The structure parameters are optimized by particle swarm optimization (PSO) method to improve performances, especially the output torque. The optimized parameters...
The mechanism of homogeneous charge compression ignition (HCCI) combustion is introduced. Based on single zone model of HCCI combustion under early injection, coupled with fuel oxidation reaction dynamical model, the mathematics combustion model in cylinder is built and simulated, then the engine's working characteristics combusted with the biodiesel and diesel oil is compared with the original, it...
Based on the interval tunnels between Fenghuang Xincun and Sha Yuan metro stations in Guangzhou City, the construction effects of the overlapped tunnels are researched. 3D Finite Element Method is also adopted. The distribution of stratum deformation and crown raising displacement of the lower tunnel are analyzed. Axial force, moment and stress changing of the overlapped tunnels during the different...
Present a method for computing the embedded depth in rock of the laterally loaded rock-socketed piles. The method, based on the Hoek-Brown failure criterion, takes into account the mobilized lateral shear resistance along the bond of perimeter of the pile in rock. The proposed method is verified to be more reasonable by comparing its result with that of other existing methods.
A multilayer radar-absorbing structure with plasma- and radar-absorbing material (RAM) is established to investigate the stealth mechanisms of the multilayer absorber. The method of impedance transformation with multiple dielectrics is used to analyze the propagation of electromagnetic (EM) waves in the multilayer structure. The dependences of EM waves attenuation on the parameters of the plasma and...
A model of two-dimensional photonic band gap (PBG) structures resonant cavity made by GaAs pillars in air with graphite lattice is proposed. Its TE and TM mode resonant wavelength simultaneously changing with temperature and force is calculated by finite-difference time-domain (FDTD) method. The results show that the wavelength of the resonant cavity simultaneously changed with temperature and force...
The crankshaft is one of the most important components of engine, it endures complex and alternate load and it is the key point and difficulty of the engine design. Dynamic characteristics of crankshaft has been abstractly analyzed its kinematics and dynamics. A model of crank-connecting rod mechanism had been built in the software of Pro/E and ADAMS. To get the minimum force acted on mounting base,...
Energy cooperation system is a complex system, and its evolution process is accordance with the evolution law of complex system. In the paper, first we analyze the evolution process and the running mechanism of the typical international cooperation systems and got the inspiration to the energy cooperation in Northeast Asia, that is, economic benefits is the basis of cooperation; the evolution process...
Purposes: To study the adhesive and the in vitro release properties of a mixture gel film prepared with two kinds of natural polysaccharides-konjac glucomannan and xanthan gum. Methods: The optimal formula was investigated by the quadratic regression rotatable orthogonal design with adhesive force as the evaluated parameter. Its in vitro release behavior was studied by the in vitro accumulative released...
The driving capability of bladder power pump (BPP) is affected by the control and structure parameters of the electromagnetic drive of the BPP. To study the driving capability, a three-dimensional finite element model of the electromagnetic drive is built using finite element method (FEM). The driving capability is investigated by means of the model, taking into account the control and structure parameters...
In teleoperation, the most effective way to increase the working efficiency of telerobot is to provide human operator with the accurate information of load force, deformation and stiffness of the object in remote working region. This paper presents a master-slave control method of telerobot based on load impedance identifier. The identifier is used online to identify the load impedance of slave actuator...
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