Applied Mechanics and Materials Vol. 302

Abstract: This paper describes a dual arm service robotfor restaurant and homeservices. As for the mechanical architecture, we designed an Omni-directional chassis with four wheel-drivensubsystems which are independently suspended so that the robot can move stably and flexibly.Two 6-DOF component-based arms are designed and attached on the robot to fetching objects. A target-guide approach is utilized for path planning to complete object fetching and reception and introducing tasks. We have accomplished the implementation of the dual arm service robot and we have host a robot show with it on the 2010 shanghai EXPO. This robot is warmly welcomed by the visitors and highly praised.

Abstract: This paper was based on the control system which consisted of the Arduino controller and extension circuit. It adopted the controlling mode of combination of the distributed controlling and centralized controlling and the multichannel joints’ parallel controlling method. The bionic snake-like robot of many joints was controlled to accomplish 3D motion.

Abstract: At present, Cartesian Coordinate Robot driving systems have several ways, such as timing-belt, screw, rack-pinion and chain. But, they are difficult to synchronously meet needs of high precision, long range and heavy load. In this paper, Trochoid Cam Gear (TCG) was used as main transmission mechanism to implement high precision and long range motion of the secondary girder of a Cartesian Coordinate Robot, and disposed reasonably the space positions of linear rails and servo motors to meet the needs of heavy load.

Abstract: In this paper, a detailed research about a high by-pass ratio turbofan engine transient performance model has been carried out, and the relevant solver equations have been deduced by employing constant mass flow (CMF) method. A high by-pass ratio turbofan engine transient model was established by means of employing the solver equations and Matlab programming language. On the basis of comparison, the calculation results of the model have quite remarkable consistency with those results calculated by GSP 11, with maximum error within 3.0%.The simulation results show that the solver equations of aero-engine deduced in this paper are of high validity and applicability.

Abstract: A multidisciplinary design optimization approach of a three stage solid propellant canister-launched launch vehicle is considered. A genetic algorithm (GA) optimization method has been used. The optimized launch vehicle (LV) is capable of delivering a microsatellite of 60 kg. to a low earth orbit (LEO) of 600 km. altitude. The LV design variables and the trajectory profile variables were optimized simultaneously, while a depleted shutdown condition was considered for every stage, avoiding the necessity of a thrust termination device, resulting in reduced gross launch mass of the LV. The results show that the proposed optimization approach was able to find the convergence of the optimal solution with highly acceptable value for conceptual design phase.

Abstract: This paper presents the three-dimensional computation design of a novel hydrocyclone using for in-situ sampling large quantities of suspended sediments. Fluid medium was simulated as the water flow through the Three Gorges Reservoir in the Yangtze River, China and particle flow described by the stochastic Lagrangian model. Both the particle tracking and flow field in the sediment sampler were analyzed to evaluate its performance efficiency. The results of three-dimension numerical modeling have shown that the newly designed sediment sampler can effectively separate micron-sized particles (63µm) from the water and realize separation efficiency of 85% or greater, which have been also proved by the laboratory simulation experiments. Furthermore, results reveal that the model is validated by the good agreement between the measured and predicted results. This paper suggested that the newly designed sediment sampler could be a desirable and low-costing alternative to a centrifuge or filtering separation system.

Abstract: The technical regulation for numerical simulation on processing technology of large forgings has entered into official supporting of National Key Special Project. This paper describes the outline of drafting the regulation. Special concerns are paid how to get a reliable numerical simulation result from material properties, nonlinear problems, convergence and verification, etc. Some main issues are pointed out and discussed.

Abstract: In the framework of the actual structure of projects and inevitably there are some uncertainties. Interval finite element method can effectively function to define the scope and provide a strict mathematical sense, the results of the calculations, and finite element method for interval data can be expressed uncertainty. In this paper, the theoretical calculation of interval finite element of a layer rigid frame structure, compared the simulation results with the combination of ANSYS modeling, Numerical analysis of examples from the results of the theoretical value and the true value of the error between the results of a very small can be proved that the interval finite element theory and method for frame structures is very applicable.

Abstract: Pulsed electromagnetic fields (PEMF) have been reported as a non-invasive way in the prevention and treatment of osteoporosis. A new PEMF generator was designed to produce more homogeneous magnetic field than normal Helmholtz coils. The intensity and distribution of magnetic field y were calculated theoretically. The results showed that magnetic field generated by improved Helmholtz coils (three identical coils) is more intensive and homogeneous than normal Helmholtz coils (two identical coils). Moreover, this apparatus might play a significant role in the study of biological effects of PEMF on osteoporosis.

Abstract: We discuss a long-distance quantum communication system based on entangled photon pairs, which apply entanglement as its fundamental resource. For distances longer than the coherence length of a counterpart noisy quantum channel, the fidelity of transmission is ordinarily so low that standard purification processes are not applicable. The quantum repeater stretches the length of the entangled photon pairs. And the high fidelity entanglement of photons between sender and receiver is obtained by entanglement purification and entanglement swapping. We compare the nested repeater with the common repeater and show that it outperforms the latter, which is built an EPR pair in less time.