Applied Mechanics and Materials Vols. 55-57

Abstract: BIT is a new technology about the system test, fault diagnosing and separating. It is more important in the design for the reliability and main tainability of system. The key technique, such as the fault tree and equation, the test location, the test signal picking and generating, the fault distinguish rule, the design of preventing error alarm and BIT software. The result showed that the key technology is useful, and the reliability, maintainability and ability of management to fault can be increased by means of BIT. The debugging of system becomes convenient. The method can be used in the system of intelligent-in-strument and industrial control computer.

Abstract: This paper provides one kind of knowledge construction to let the engineers and technicians apply the knowledge to the product’s simulation optimization function, the ability of establishing the design criterion and the technical standard, and the convenient knowledge reuse tool to manage the knowledge effectively. In this paper the knowledge expression, the knowledge tool as well as the inference engine of the knowledge library is packed as the knowledge management module which is called for the design simulation optimization system of the outside products. The application frame of the knowledge module takes the knowledge management as a center, and form finally the knowledge management engine embedded in the design simulation system based on the unified multi-disciplinary modeling. Therefore, the knowledge management module is divided into the knowledge modeling, the knowledge expression, the knowledge reasoning, and the knowledge management. Aiming at the deep custom-made degree of the multi-functional hydraulic lift machinery, the complex restraint and coupling relations between the components and parts, the non-unified model descriptions between the multi-disciplines, and the difficult management of massive isomerous data, the basic frame of the multi-disciplinary configuration optimization design for the ETO product of the hydraulic lift machinery is proposed in the paper.

Abstract: The ETO product’s modularity manufacture needs the ETO product’s modular design as a foundation. By fully distinguishing and exploiting the geometry similarity, the structure similarity, the function similarity and the process similarity of the multi-ETO products, using the methods of standardization, modularization and serialization, the ETO products as well as the corresponding manufacture systems are modularized. In view of various standard components and parts produced by the modular design and manufacture, the products needed for the customers are directly assembled using a set of the advanced operation flow suitable for the modular assembly, and selecting the appropriate standard parts. Thus the production cost, the assembly cost as well as the inventory cost and so on are reduced. The modular manufacture is using the modular technology in the manufacture process to form the overall integrated production and assembly system of the components, and to recompose the manufacture process promptly according to the specific production. This paper proposed the optimization method of production organization, established the CAPP system’s architecture based on the modularity technique supporting the ETO product and developed the cooperative CAPP platform of the multi-functional hydraulic lift machinery.

Abstract: An auto-adaptive scheme of embedding watermark based on wavelet transformation domain is proposed in this paper. Firstly, the scheme applies wavelet transform to the original image, confirms the ideal embedded location in low-frequency coefficient of wavelet transformation domain by using FCM algorithm integrating with the apperceive characteristics of human visual system and related local characteristics of image. According to quantization rule of wavelet coefficient proposed in this paper, the information of scrambled watermarking is adaptively embedded in corresponding position. The method of finding the embedded location in the process of watermark extracting is same as the method of embedding watermark. Secondly, extract the information of embedded watermark according to the rule of coefficient quantization. Finally, after the process of anti-scrambling and enhancing dimension, the embedded watermark image is obtained. Experimental results show that the proposed scheme has performance of good invisibility and robustness.

Abstract: Trajectory-tracking problem of wheeled mobile robots is investigated. Adaptive control scheme utilized has only one control signal. The control input gives out the velocity increments which will be utilized to adjust the pose of WMR so as to track the desired trajectories. The controller adopted is simple to realize and easy to tune the parameters, which is benefit to real applications. Numerical simulation results show that the control scheme is valid.

Abstract: The fiber point diffraction technology is applied in interferometer to measure optical surface with high precision. The wavefront diffracted from the single mode fiber with microns core diameter can be considered as ideal spherical wave and used as the referenced wave in interferometry. To estimate the quality of diffracted wavefront, the theoretical model of optical point diffraction is introduced at first. Based on the model, the influence of fiber core diameter, deformation and end-face shape on wavefront error is studied with numerical analysis. The analysis result shows that the single mode fiber used in experiment is available for instrument design and its influence over systematic error should be negligible within certain numerical aperture. Then a point diffraction interferometer with a single fiber is designed. Compared with the double fiber system, it has merit of noise immunity, high fringe contrast and high performance. Finally, the fiber point diffraction interferometer system is put up to measure spherical surface in experiment. The interference fringes are collected and analyzed with five-step shifting, least squares unwrapping and Zernike fitting method. The results show that the interferometer with optical fiber has achieved a worthy measurement precision and has great development potential.

Abstract: This paper presents a scheme for blockboard nondestructive detection. X-ray nondestructive testing system has been used to obtain blockboard x-ray images. In order to recognize defects of blockboard effectively through x-ray images, an image processing method based on wavelet transform and gray-scale mathematical morphology is proposed. Firstly, image noises are reduced by wavelet soft threshold de-noising, and then a new modified mathematical morphology edge detection operator is used to detect edges of the de-noised image. The experiment results show that the method performs well in noise-suppression and edge detection. The proposed nondestructive testing method of blockboard is practical and easy to implement.

Abstract: PCNN model has the characteristic of similar group neurons releasing pulse synchronously, which is suitable for image segmentation that performs logarithmic transformation on luminance component of color image in order to accord with human visual characteristics. During the segmentation process of R, G, B three components of color images, choosing neuron key parameters by genetic algorithm, controlling iteration by skewness indicators, achieving edge detection of split graphs from R, G, B three components in the model of Unit-Linking PCNN, and getting final results by the strategy of weighted combination. Simulation results show that the approach can embody more contour details of images, and is more self-adaptive.

Abstract: What the group control of the elevator traffic system deal with is a complex, random, multi-objective, nonlinear, uncertain decision-making problem. Good effect of controlling elevators can’t be achieved with traditional control methods. Elevator group control system based on fuzzy single chip computer is introduced in this paper. Fuzzy inference can be carried out based on control rules that are programmed based experts’ experience. Then elevators are allocated in the light of inference result in order to achieve ideal control effect.

Abstract: A new-style slick pole self-lock up-down setting is designed to realize large size up-down of crossbeam, its principle is that crossbeam’s “limitless” pass is realized by alternate motion of an overtop elastic cannula and a ringent elastic cannula connected with poles. FEM is used to calculate proper interference value to guarantee that elastic cover can move freely when it is pressed and it can be locked when it isn’t pressed. A new-style slick pole self-lock up-down setting’s design is based on it. Simulation analysis and practical application shows that this method is feasible.