Advanced Materials Research Vol. 823

Abstract: Sprag overrunning clutch is one of key components in the drive system. Its a meaningful work to design and manufacture high performance sprag clutch to meet the practical working situation. In order to design reliable and durable clutch with good dynamic characteristics, this paper put forward a new type wedge surfaces which is a combination of involute and eccentric arc. On the basis of analysis of a clutch structure, work principles and failure modes, the sprag ,key element of the clutch, was demonstrated the feasibility of involute in the use of wedge surface design by analyzing the characteristics of involute, and the main sprag parameters were designed and analysized. The design of the new wedge surface, increasing the strut angle and effective cam rise, increased carrying capacity, reducing the contact stress, and extending service life, which laid the foundation for the sprag overrunning clutch design improvements.

Abstract: It is used by the piezoelectric ceramics sheet of positive-inverse piezoelectric effect in a set of copper alloy remanufacturing repair cantilever vibration system as the research object in the paper.A state space model have been generated on the cantilever beem mechanical structure of dynamics finite element modeling and degrees of freedom dynamic polycondensation.It is inhibited effectively when a cantilever beam subjected to external transient pulse disturbance caused by first order, two order and higher order system mode vibration,by using the linear quadratic optimal control of two state regulation for the detection of position feedback independent modal control on the basis of the state-space model. Software is used to simulate active vibration control effect.The simulation results show that the mode control inhibited have excellent effects for the repaired cantilever vibration, also analysed on the modal control parameters for the vibration suppression effect.

Abstract: Based on the characters of NC lathe and NC grinding machine, the NC grinding machine rebuilding for TG30 NC lathe is studied in this paper. According to the geometric parameters of grinding, choose appropriate TG30 NC lathe, keep the driving system of spindle and the feeding function of two axle linkage of NC lathe, increase the high speed rotating grinding head electric spindle, to realize the one-time processing of inner hole and groove fillet R grinding.

Abstract: Abstract. DSP has been one of the most fashionable embedded technology after SCM and the core engine of the digital information age. With the constantly effort and innovation of the Texas instrument(TI) ,Freescale and other companies, performance and function of DSP has been more and more stable and powerful. Digital Signal Processing (DSP) which is a rapidly developing neotype branch has provided a perfect solution for controlling all kinds of motor. The TMS320F28335 from TI has been used as the core of the control. The connecting of the system of the motor and DSP,wave mode for operating,the program for controlling are elaborated .Moreover the different between DSP and other method for control and the caution notes has been analyzed.

Abstract: During the time that a hypersonic vehicle experiences the reentry segment, the environment changes dramatically. This paper analyzes all kinds of constraint conditions of the reentry process, then designs the reentry corridor in both the D-V plane and the H-V plane, and analyzes the influence of various factors on the reentry corridor according to that. Based on the constraint conditions, the reentry segment is divided into the initial descent phase, angle of attack recovery phase, overload hold phase and angle of attack transition phase. Meanwhile the rationality of the design is verified by simulation.

Abstract: Film thickness is one of the important parameters in the plastic film production process.A dynamic film thickness control system ,gradually adjusting the opening degree of the wind ring, is utilized for real-time control film thickness, enabling the film thickness to meet the requirements.This paper proposes a dynamic film thickness control system based on automatic wind ring ,consisting of industrial control computer, capacitance detection module, wing ring device , motor drives and so on.Then it further states the method of controlling the opening degree of wind ring by a series of stepper motors. The method can make the film thickness uniformity better,combining the traditional film production line with an idea of controlling automatic wind ring .

Abstract: With the development of highway transportation, there being a rapid increasing in the number of highway bridges. On one hand, it creates a good condition for the development of our economy, on the other hand, due to the security risks often bring up a lot of tragic accidents, the issue about regular maintenance of the bridge becomes more and more important. Having taken all above mentioned into consideration, this paper designed a special vehicle named "Viaduct Maintenance Multifunction Vehicle ". The vehicle mainly adopted the plane bear and gear combination as chassis rotary mechanism; used rack and gear meshing as elevating mechanism,and realized the trusss fliping by pneumatic circuit .As well as ,this paper included SCM system and wireless remote control technology, through them multifunctional special vehicle could provide protection for workers accomplishing altitude operations in the process of the viaduct repair and maintenance. Finally,we used three-dimensional software Solidworks for motion simulation to verify its functionality.

Abstract: The panoramic vision simulation system, which is based on 3-D virtual simulation technology, as a new training mode, receives more and more attention. It is better to establish a scientific, reasonable and feasible evaluation standard and index system. According to the characteristics of 3-D virtual simulation technology and the process of loading/unloading in container yard, the process of loading/unloading in container yard is divided into three separate stages. The training and appraisal subsystem of the panoramic vision simulation system, which is different from the existing systems, is analyzed and designed. This panoramic vision simulation system, which is specially designed for crane drivers, is also introduced.

Abstract: This paper studies the synchronous control strategy which can meet certain dynamic performance and the closed loop robustness to external disturbance in servo system. This servo system has two same PMSMs which are used in a new CNC molding machine for forming grinding wheel. To achieve high-precision of the machine, we designed the hardware construction of the servo system. At the same time, this paper proposes a synchronization control scheme based on cross coupling control algorithms. The performance of the cross-coupled system is theoretically analyzed and simulated. It was proved that this synchronization control scheme has quick response, robustness and small dynamic process synchronization error, which could meet requirements of the high-precision synchronization control.

Abstract: A transmission test platform for performance analysis was designed based on 3-D modeling and simulation technology which were used to provide a theoretical comparison basis for the following experiments. Design of key part of the transmission system, such as couplings which were customized. Modeling of test platform was built to study the mechanical structure in theory. Static structure and modal analyses were carried out to evaluate the performance of planetary and worm gearing. Compare analysis results between planetary gear and worm gear reducer which include backlash and vibration phenomenon. At last, we make a conclusion that the planetary gear has less vibration and noise than the worm gear in this type of reducer in theory, and we will give some reasonable explanation.