Advanced Materials Research Vols. 211-212

Abstract: To take ZLP500L type suspended platform for research object, establishes parametric finite element model with ANSYS, and analyze static performance of its structure. Define the platform section parameters as the design variables, and structure in dangerous working conditions of stress and displacement as state variables, makes optimization design of platform with first-order method, so obtain lightweight high degree of section parameters which reducing 26.16% total quality of platform. Meanwhile makes buckling analysis of optimized platform to obtain smallest the critical load coefficient is 171.56, and then verifies the platform structure stability, provides theory basis to ZLP500L type suspended platform design and alteration.

Abstract: A mechanism based on a four-linkage mechanism and a hybrid-drive six-linkage mechanism is designed to imitate the function of the basilisk lizard running on water. The kinematics analysis of the water running mechanism is carried out by using the linkage mechanism kinematics and the D-H method. Then the stability analysis of the mechanism is carried out according to the critical conditions. At last the mechanism is simulated and optimized for getting the maximum momentum in the slap phase and the maximum force in the stroke phase. And the simulation result shows that the mechanism can satisfy the requirement of biped water running.

Abstract: Both class information of face subjects and color information of face images are very important cues for recognition. In this paper, a novel class dependent color face recognition approach based on block diagonal discriminant NMF is proposed. The approach employs block diagonal matrix to encode color information of face images simultaneously. Block diagonal constraint is imposed on discriminant NMF algorithm to construct feature extraction approach, which fuses class and color information at the same time into the extracted facial features. To improve learning efficiency of the algorithm, 3D active deformable model is exploited to generate virtual face images. Experimental results on CVL and CMU PIE face databases verify the effectiveness of the proposed approach.

Abstract: Since the development almost a decade ago of the first biosensor based on surface plasmon resonance (SPR), the use of this technique has increased steadily. In this study, we theoretically investigated the sensing character of SPR sensor with reflection type metallic with Rigorous Coupled Wave Analysis (RCWA) method, and the mechanism is analyzed by the field distribution. It is found that the sensitivity of negative diffraction order, which goes higher quickly as the resonant angle increases, is much greater than that of positive diffraction order.

Abstract: In this paper, a high precision control and a state estimation methods based on the learning algorithm are proposed. By means of the feedback error-learning method, at first, the variation of physical parameter is identified. Then, online estimation can be performed comparing the learned weighting coefficients in the neural network. The proposed method is applied to a precision control system, and is verified through the experiments.

Abstract: This paper presents a new method of automatic detection and elimination of local interference methodology for five-axis complex surface machining with a flat-end milling cutter based on the technique of curvature matching and square grid points. A diameter of milling cutter was chosen by curvature matching to ensure interference-free at the point where the cutter and part contact. In odder to detect if rear interference occurs at the adjacent domain of contact point, the square grid points were employed to quickly build checking area and checking points. A technology of automatically generating square grid points and the method of detection and avoidance of local interference were also presented in this paper. Finally, the proposed methodology and algorithms were tested and verified by an example of NURBS surface.

Abstract: The paper aims to sense strains of structures in two-dimension stress states and to perform a large-region strain monitoring. Polymer-matrix Carbon Fiber Smart Stripes (CFSS) distributed in two ways are stuck on a bending plate to detect strains using the piezoresistivity of CFSS. Monotonous tests are conducted to calibrate the surface piezoresistivity of the CFSS and then cyclic tests are conducted to measure the strains of the structure using the constitutive relation of CFSS. Results show the experimental values by CFSS fairly good with those by gage factors.

Abstract: Recently guidance system is becoming more popular, as more people realize its benefits. There have been many developments on campus guidance system (CGS) in personal digital assistant (PDA) and smart phone. The building and promotion of the energy efficient location determination method is an important part of CGS. The cellular-based location determination using RSS from cellular network is more immediately, power-effective, and easy to deploy and maintain than traditional methods. In this paper, we design the CGS which provides the fingerprint position algorithm (FPA) using RSS from cellular networks and location-based service (LBS) for user reference. In experiments, we compare the estimated positioning information with the real information from global position system (GPS) receiver. The results show that the error of location estimation using FPA is about 9.92 meters. This approach is feasible to be applied to CGS.

Abstract: Shape memory alloy (SMA) is a new intelligent material and is used widely in various structures. But the constitutive model of SMA is so complex and particular that it is difficult to calculate by finite element software. In this paper, a special constitutive model of SMA is chose and the constitutive variables are discretized. Through the derivation, it is made possible that the constitutive relation of SMA is put into the UMAT (user-defined material mechanical behavior) subroutine in ABAQUS. So it is available to calculate the structure contained SMA by finite element method.

Abstract: In order to decay vibration and recycle energy, the shock absorber that is self-energizing leveling systems was researched. The co-simulation method was adopted. A mathematical model for the shock absorber was built using the software MSC.EASY5, and the establishment of this model was based on the analysis of internal configuration and characteristics of valves. Debugging simulation of this model was also conducted. Vehicle simulation model was built using MSC.ADAMS. The assembly between vehicle simulation model and the shock absorber was realized through co-simulation between ADAMS/CAR and MSC.EASY5. After the integration of the full vehicle model the road test simulation with the input of random road surface signal was conducted. The simulation results shows that self-energizing leveling systems can partly recycle this energy which can be used to adjust ride height due to load change of automobile. This shock absorber is improving the ride performance of vehicle.