Applied Mechanics and Materials Vols. 556-562

Abstract: Tapered interference fits can avoid the influence of keyways on the parts strength and transfer large torques. In this paper, a model was developed to study the influence of the taper on the interference fit between a propeller hub and a shaft. Using the classic elastic plane stress theory, the exact solutions of the radial stresses, tangential stresses and radial displacements of the propeller hub and shaft are derived. Then the calculation method of the magnitude of the tapered interference fit was presented. Finally taking a screw propeller system as an example, the above solutions were calculated by using the numerical method. The results show that the taper plays a key role in the interference fit. Improving the stress distribution of the propeller hub is an effective approach to increase the connection strength. The present analytical solutions are expected to be useful in the structure design of tapered interference fits for propeller hubs and shafts.

Abstract: With the development of the simulator and the increase of vehicle model simulation frequency, the ring tire models become the research focus. The ring model considers the physical characteristics of the tire, thus it can more accurately describe the tire force transmission. State Key Laboratory of Automotive Simulation and Control of Jilin University has developed a dynamic wheel model. This model takes the tire crown part as a rigid-ring and describes the elasticity of the tire by using six spring-dampers to connect the rigid-ring with the wheel rim. This paper focuses on the logical judgment of dynamic, static friction between tire and road. Based on the logical analysis, the tire forces at transient process are researched in order to avoid oscillation. Based on the C language to build simulation program, and embed it into complex vehicle model to simulate different conditions, the simulation results show that the vehicle can start smoothly.

Abstract: We present a bound for estimating the minimum-error probability of ambiguous discrimination between any m quantum operations. There are only Kraus-operators and a priori probabilities of the discriminated quantum operations in this bound, and which has nothing to do with the input states. To a certain extent, we generalize the bound on the minimum-error probability for ambiguous discrimination from mixed states to quantum operations.

Abstract: Taking the parallel stabilizing platform based on 6-UPS structure as the research object, we deduced the multi-rigid-body dynamics modeling process by using the Lagrange method, and finished the dynamic response analysis of the platform. Then we conducted the collaborative modeling and simulation of the coupled dynamics analysis of the platform with ProE, ANSYS and ADAMS. The results indicate the correctness of the theoretical derivation of the multi-rigid-body dynamic model and the feasibility and necessity of collaborative simulation of the coupled dynamic model, which lay a foundation for further optimization design and practical application of the parallel platform.

Abstract: As the demand of higher image quality and greater processing capabilities are growing, obtaining higher data bandwidth for on-chip processing is becoming a more and more important issue. DMA (Direct Memory Access) component, as the key element in stream processing SoC (System on Chip) [1], should be deeply researched and designed to satisfy the high data bandwidth requirement of processing units. In this paper, we introduce a scalable high-performance DMA architecture for complex SoC to satisfy rigorous high sustained bandwidth and versatile functionality requirements. Several techniques and structures are proposed in this paper. A state-in-art verification environment is built for our design to fully verify its functionality. At the end of the paper, the tape-out results are provided. The whole implementation has been silicon proven to be functional and efficient.

Abstract: In order to solve the problem of losing optimum structure in the stage of fitness evaluation, a matching outputs approach to evolutionary design of polymorphic self-checking circuits is proposed in this paper. By adding NOT gate to outputs of the candidate circuits, the fitness and the diversity of the population are increased when the matching degree of the output is lower than 1/2. The experiments of evolutionary design for 1-bit self-checking adder are conducted by combining the polymorphic gates with conventional gates. Experimental results show that the proposed method can detect all the stuck-at-faults. The generation of evolution is decreased by 28% to 32% compared with ordinary method in designing polymorphic self-checking circuits. The proposed method enjoys advantages of faster convergence and less iteration.

Abstract: In order to meet the requirements of high speed and real-time in SAR processing system, as well as breaking the bondage that traditional processing board is subject to the algorithm. This paper designs a generic mass storage real-time signal processing module with TI's latest multi-core DSP-TMS320C6678 based on OpenVPX high-speed serial bus standard. This module has standardized, modularized, reconfigurable characteristics. This paper discusses the design of this module and the implementation of typical parallel SAR imaging algorithm mapping on this module. This peocessing module has been applied in a variety of airborne SAR radar signal processing systems and fully validated its powerful processing ability and versatility.

Abstract: As a zero-emission mode of transportation, an increasing number of Electric Vehicles (EV) have come into use in our daily lives. The EV charging station is an important component of the Smart Grid which is now facing the challenges of big data. This paper presents a data compression and reconstruction method based on the technique of Principal Component Analysis (PCA). The data reconstruction error Normalized Absolute Percent Error (NAPE) is taken into consideration to balance the compression ratio and data reconstruction quality. By using the simulated data, the effectiveness of data compression and reconstruction for EV charging stations are verified.

Abstract: In this paper, we used Lab VIEW development platform, designed a virtual signal acquisition and analysis system based on the soundcard. In addition we studied the signal acquisition performance of it. This system has functions of signal acquisition, analysis, waveform display and storage. It is easy to use with good interface, and function appending is available on user requirement. It offers a kind of DAQ solution with low cost. It has broad application prospect, can be extended to the field of speech recognition, ambient noise monitoring and laboratory measurement etc.

Abstract: This paper concentrates on choosing basic materials for the polarizing beam splitter in the transmitter and receiver isolation network, and considering the influence of polarizing beam splitter’s ability parameters with different basic materials through analysis the optimizations. Based on the previous study above, we also devoted to find the most suitable basic materials, for which could improve the capacity and optimize the structure of the polarizing beam splitter.