Advanced Materials Research Vol. 764

Abstract: Throttle governing circuit system is often used in feed actuating system of machine tool to realize stepless speed regulation, which dynamic characteristics have a great effect upon the work property of machine tool. This paper discussed mathematical model of throttle governing system, dynamic characteristics analysis and improved measures, it can provide Theoretical basis for improving work property of modern machine.

Abstract: The value range of the cylinder wire front angle of cotton combing frame determines the effect of cylinder combing, with the analysis of the force of fiber in comber cylinder wire, a mechanics model is established. Combining with the test verification, we can get the calculation model of the cylinder wire front angle of cotton combing frame. The model indicated that the value range of the cylinder wire front angle of cotton combing frame is decided by the varieties of cotton fiber and parameters of combing machine process, thus this paper provides reference for the development of the cylinder wire of cotton combing frame.

Abstract: The simulation model of the DC-DC buck switching power supply was built. The chaos phenomenon of the DC-DC buck switching power supply was studied by the simulation. The simulation result showed a point was described in the chaos figure of the output voltage or current waveform of the system when the system was in a stable state. When the chaos of the system was happened for some reason, the system became unstable, cycle presented infinity and all point may not fall in the same position, at the same time also meaning the chaos phenomenon has happened, so in the figure could describe countless different point.

Abstract: This paper redevelops Rhino based on the Rhino script and extracts three kinds of bounding boxes (i.e. cuboid, cylinder and sphere) of product fission model, and calculates the optimal parameters of fission bounding boxes with the aid of the GUI interface built by MATLAB. The software of prototype reconstruction of product forms is developed by the use of VB.NET, which can reconstruct the product form prototype through the product CAD model. In the end, the system validity is tested and verified by the practical example of a chargeable electrical drill.

Abstract: This article researches and discusses the current situation of the modern forest fire helmet. It focuses on the problems and difficulties in the modern forest fire helmet design and analyses them. With the concept of user-friendly design, this article advances the user-friendly design principles in modern forest fire helmet design.

Abstract: A series of cylindrical helical torsion springs has been designed with the help of the similar design theory and method. The values of maximum torque and stiffness of the series have been figure out.