Applied Mechanics and Materials Vols. 789-790

Abstract: The kind of intelligent tracking vehicle is designed by STC89C52 as the main control chip, combined with DC motors, multiple infrared sensors, Bluetooth remote control, and other peripheral circuits. The intelligent vehicle can walk along black trajectory. Its speed can be monitored and its state of motion can be changed by remote control. The experiment shows the entire body design is sensitive, accurate control, system stability, and achieves the desired objectives.

Abstract: A linkage with seven links for the task of body guidance is proposed and evaluated. This linkage has two degrees of freedom and is consisted of a four-bar linkage, a dyad, and a floating link. The analysis reveals that at most eleven positions can be prescribed if the linkage is equipped with two actuators. The constituent four-bar linkage and the dyad can be separately synthesized by using well-developed techniques for synthesizing four-bar linkages. Each of them can satisfy five prescribed points together with four swing angles so that this seven-bar linkage can be driven by a single actuator after modification by adding gears. Problems of order defects, branch defects and ratios of link lengths are all considered to ensure the applicability of the synthesized linkages.

Abstract: The article outlines the process of developing a mathematical model of the human arm. The model arm consists of two joints connected by the rotational link. Each of them is represented as a truncated cone prism which changes its shape during motion. The shape change instant depends on the two-state coordinates being the angular displacements q1 and q2. Based on the analysis of the arm motion a mathematical model is proposed. The design process is made on the basis of switched systems theory. We present a transition from the general equation of a two-link arm’s dynamics to the state equation for stationary linear models. Based on previous step a mathematical model is presented as a switched linear system. The article also shows that the dependency of the switching rule on the two components of the state vector.

Abstract: Extraction of geometric information and reconstruction of a parametric model from the data points captured by various sensors or generated by various image preprocessing algorithms is a vital research issue for many computer vision and robotics applications. The aim is to reconstruct 3D objects, consisting of planar patches, in a scene from its point cloud captured by a sensor set. A reconstructed scene has many applications such as stereo vision, robot navigation, medical imaging, etc. Unfortunately, the captured point cloud often gets corrupted due to sensor errors/malfunctioning and preprocessing algorithms. The corrupted data pose difficulty in accurate estimation of underlying geometric model parameters. In this paper, a new algorithm has been proposed to efficiently and accurately estimate the model parameters in heavily corrupted data points. The method is based on forming clusters of estimated planes with reference to a fixed plane. Clustering is accomplished on the basis of angles and distances of estimated planes from the reference plane. The proposed method is implemented over a wide range of data points. It is a robust technique and observed to outperform the widely used RANSAC algorithm in terms of accuracy and computational efficiency.

Abstract: This paper built 3D motor model by SolidWorks, using finite element software Fluent to simulate the temperature field and fluid field of the permanent magnet motor. The cooling effect of “C” type structure with different radiating rib was analyzed in this paper. Simulation analysis of motor temperature rise was carried out under different inlet flow. It provides a reference for the further study of motor shell optimization design.

Abstract: FlexRay bus is considered as a more promising bus in the future with the performance of real-time, scalable, and fault-tolerant. In this paper we will design an electric vehicle battery management system (BMS) based on FlexRay bus, including the hardware design, the SoC estimation method, FlexRay protocol design and software development. The test bench experiment results show the system design is reasonable and feasible.Keywords- FlexRay, BMS, Li-ion battery,SoC, Design

Abstract: Swivel spindle head is a key component used in gantry type five-axis machine tool of high performance and is of great importance in its application and design. Nowadays, more and more components are manufactured by high precision CNC machine tools, such as components of spaceflight, renewable energy and automobile, etc. Therefore, high precision machine tools of multiple axes are more and more urgently demanded, while dual axis rotary head is one of the most important components for a multi-axis machine tool. Hence, it will be a key to develop dual axis spindle head that meets high precision needs. The study explores the highly responsive direct-driving motor able to drive the spindle head to rotate with multi-driving rotary technology. The dual-driving motor rotates via multi-driving units, generates torsion that magnifies and eliminates its clearance, and then drives the spindle head to rotate. Results of the test show that the completed machine tool can meet the standards of dual axis rotary head with high precision in, no matter, speed, distance, positional accuracy, repeated accuracy or maximum torque, etc.

Abstract: This paper present the ordering of an electric vehicle EV at two driving wheels postpones by DTC and FDTC. This order is based on two estimators to control flux and the couple. The principal advantages of the FDTC are the speed of the dynamic response of couple and the weak dependence with respect to the parameters of the machine, as well as the simplicity of implementation in real time. This order is well adapted for the systems of electric traction.

Abstract: Over the years, mechatronic systems have witnessed an increase in complexity. To address this issue, a model-based approach has been utilized to produce coherent system specification. In model-based engineering, a system is depicted graphically and textually at various levels of granularity and complexity. For this purpose, Systems Modeling Language (SysML) is designed to support development stages in systems, including specification, analysis, design, and validation, and to generate specifications in a single language for use by heterogeneous development teams. Nevertheless, an underlying tool is lacking that would express the totality of a system’s processes and concepts, including mechanical, electrical, and informational aspects. SysML introduces a variety of diagrams and tools that are heterogeneous in notation and terms, e.g., use cases, blocks, activities, components, parameters, sequence, and so forth. This paper proposes a diagrammatic methodology to specify a unified conceptual map for mechatronic systems that can play the role of blueprint for a whole system at different stages of development. The paper focuses on using the proposed methodology as a specification tool, offering a new model that captures the dynamic behaviors of the system. The claim is that this proposed model for specification provides a nontechnical map of the system without a multiplicity of representations as in SysML. To demonstrate the viability of the model, it is applied to a case study of an airport baggage handling system.

Abstract: The objective of this research is to examine the relation between the straightness and the cutting force ratio during the CNC turning process. The cutting force is monitored and obtained by installing the dynamometer on the turret of CNC turning machine. The relation between the cutting force ratio and the straightness is investigated under the various cutting conditions, which are the cutting speed, the feed rate, the depth of cut, the tool nose radius and the rake angle. The experimentally obtained results showed that the straightness can be improved with an increase in cutting speed, tool nose radius and rake angle. The relation between the dynamic cutting force and straightness profile can be proved by checking the frequency of the cutting force in frequency domain with the use of the Fast Fourier Transform (FFT), which is the same as the straightness profile. Hence, the cutting force ratio can be used to predict the straightness during the cutting regardless of the cutting conditions. The cutting force ratio is proposed to predict the straightness during turning process by employing the exponential function for the sake of straightness. The multiple regression analysis has been utilized to calculate the regression coefficients of the in-process prediction of straightness model by using the least square method at 95% confident level. It has been proved by the cutting tests that the in-process straightness can be predicted during the cutting within ±10% measured straightness with the high accuracy of 91.85%.