Key Engineering Materials Vols. 579-580

Abstract: Aiming at solving the problem that the existing restoring strand operation mechanism cannot realize self-adaption to the variation of position and shape of transmission lines, a method for self-adaptive mechanism design is introduced and summarized to meliorate the mechanism. This method is effective and practical, which can be applied to most common mechanism design: first of all, analyze the structural features of the self-adaptive mechanism; secondly, establish a universal method to determine the structure type named as initial kinematic chain which contains information of the degree of freedom (DOF), the number of links and the kinematic relations between every two of them; finally, considering the features of the existing mechanism, apply the self-adaption design to realize the required mechanism by inverting the initial kinematic chain, and build models and simulations to prove that the improved mechanism does have the ability of self-adaption to the location and shape variation of transmission lines.

Abstract: Brake caliper unit with intricate structure is the last guarantee device for trains braking, while technology in this aspect is still backward. RE of advanced equipments is an effective and fast way to improve the existing situation. But efficiency and accuracy would be lost if the reversing program is planned in unappreciated way. In view of this, a whole RE scheme for the certain unit was presented in this paper. Multi-measurement was adopted that integration of conventional measurement and 3-D digital measurement was proposed. Based on analyses of structure and function of the crucial parts, feature decoupling was given obeying the principle of data segmentation. From which basic feature groups were extracted as bases of further measure method choosing. Functions of mechanism and demands of precise assembly were all taken into consideration to ensure the high accuracy and efficiency. With help of the optimal matching between structure feature and certain measurement, geometric information digitization was realized and the existing status of excessive point cloud data caused by single measurement was improved. As to part model reconstruction, characteristic curves were fitted in Imageware environment. Taking point clouds as reference, CAD models of parts were built in Pro/E environment. A general process of reverse engineering of complex structural components was stated.

Abstract: In order to guaranty the work stability of the move-in-mud robot and movement relationship of wriggle turning joint, to use the 3-UPS parallel mechanism as the steering joint. Make full use of the characteristics flexibility, heavy force loading and small workspace of the parallel mechanism. Supporting link of the parallel mechanism driven by hydraulic cylinders, so a completely hydraulic system is an important factor to ensure the stationary work of parallel mechanism, provide the required power to go forward and ensure the forward speed of the move-in-mud robot. Establish the virtual prototype model of mechanical-hydraulic coupling system by using of Pro/E and ADAMS/Hydraulics software, do the dynamic simulation analysis of hydraulic control system based on Hydraulics module, the simulation process can be made more visual and vivid by three-dimensional visualization. Obtain the platform speed and hydraulic cylinder pressure curve after simulation, compare simulation results with theoretical calculations, and verify that the design is reasonable. The results show that it lays the foundation for the further optimization and research of the move-in-mud robot.

Abstract: This paper studied the motor current signature analysis also called sensorless detection. It used to distinguish the feasibility of the motor drive system for rolling bearing fault diagnosis. This method used in fault diagnosis methods of wind power transmission system provides a certain amount of basic research, overcome conventional vibration monitoring high cost and installation of the inconvenience and other shortcomings. A special experiment platform was designed, comparison analyzed the typical current and vibration signal of fault bearing by using signal processing method such as Hilbert transform. A large number of experimental analysis results show that the rolling bearing fault current signal characteristics and the expected failure frequency is roughly the same and basically agrees well with the vibration test results. These prove the feasibility and accuracy of sensorless detection.

Abstract: nappropriate design of steering mechanism will reduce the life of tires, increase steering difficulty and the risk of skidding. In this paper, the simulation and optimization of the steering mechanism of a 220t mining dump truck is analyzed. Firstly the motion of the steering mechanism is analyzed with kinematics and dynamics simulation with ADAMS. Objective functions for the steering mechanism are established and optimized with MATLAB. Then the stress and strain of the tie rod is analyzed to check if it meets the requirements. Moreover, the knuckle arm is optimized based on the theory of topology optimization.

Abstract: In this paper, a knowledge innovation model of contemporary integrated manufacturing system based on knowledge innovation theory and theory of creative thinking was proposed. Based on the interaction of innovation group knowledge and individual thinking, the basic idea of the model revealed the knowledge relation and cognitive development of multidisciplinary knowledge and creative thinking within modern integrated manufacturing system and explained knowledge innovation process of integrated manufacturing system for heterogeneous integration. The simulation results proved that the interdisciplinary knowledge innovation model of contemporary integrated manufacturing system better explains the internal mechanism of multidisciplinary knowledge innovation process. The simulation results are displayed by the pictures and validated by thepractices.

Abstract: Fishes have evolved remarkable swimming abilities after years of evolution which inspire scientists and engineers to develop new underwater robots that mimic different kinds of fishes. Stingray is a unique species among median and/or paired fin (MPF) mode fishes which undulates the enlarged pectoral fins while swimming. In this paper, a biomimetic prototype design and a developed undulating fin propulsor that mimics stingrays are presented. Kinematic model of the undulating fin is built. The flexibility of the curved surface is checked by the fitting results. Detailed mechanism structure and control system design of the bionic prototype are illustrated. The simulation experiments of the propulsor were conducted on the ground and the results show that an approximated harmonic wave can be generated on each side fin. The feasibility of the motion control method is verified.

Abstract: The Direction Judgments of The bolts loosen of standard knot is important for the research of tower crane. We have established a dynamic simulation model of tower crane, and have got the corresponding relationship between top trajectory and angle of the beginning of bolts loosen. And the physical experimental model has been establish to verify the relationship.

Abstract: This paper presents a procedure and the results of structure design about a picking manipulator to be used for autonomous banana harvesting. Based on structure analysis and module partition for the picking manipulator, DriveLib model library was developed employing the virtual simulation and modeling language Modelica. A body structure model for the picking manipulator was established based on component models in DriveLib model library. Motion controls mathematic models for the picking manipulator were analyzed according to drive motor performance for the body structure, and then the partial differential equations were transformed into the ordinary differential equation easily solved by Modelica with the Laplace transform, mechanical motion simulation was realized. The validity models could provide a theoretical basis for picking banana manipulator primary design.

Abstract: Raising a pneumatic measurement method to measure the valve sleeve bores cylindricity based on error compensation. Analysis related errors of the raised measurement method, determined the maximum error, and setting up the error compensation model to the maximum error, designed the measurement system, related experiment has been conducted, which verified the correctness of the measurement method and the accuracy of the measurement system.