Papers by Author: Jin Sheng Zhang

Abstract: From the perspective of statics, the deformation of welded beam under the action of gravity and cutting force was studied in the paper. During the actual machining process, vibration of welded beam and even the machine can be caused due to the change of cutting condition and interference from the outside. To avoid the natural frequency, and prevent the occurrence of resonance phenomena, welded beam modal was further analyzed; the first six natural frequencies and mode shapes of the beam were achieved. Statics and modal analysis are the basis of lightweight design of the welded beam based on topology optimization. The topology optimization model of maximum stiffness design and eigenvalue problem structural dynamics was established. Finite element model of beam and its components was established in hypermesh, and the optimization objective function, constraint function and boundary conditions were also set. Compared with the structure before optimization, the weight of the beam was reduced 10%, the lightweight design of the welded beam was achieved and the comprehensive performance of the beam was significantly improved.

Abstract: The electric valve, cutting off or connecting pipeline of nuclear equipment, is an essential component of nuclear facilities for safe operation. The structure of self-developed enclosed nuclear electric valve is introduced in the paper firstly, and dynamics analysis of steam fluid in valve is carried out to tackle typical problems including leakage in the rapid open-close process of valve for high-temperature and high-pressure steam fluid. It can be determined that dynamic characteristic of steam fluid will directly affect force suffered by valve in the rapid open-close process, greatly influencing movement and ultimate position accuracy of valve gate.

Abstract: As diamond wire saw machining device, the vibration characteristics of beaded rope has important implications on the processing quality and the service life. Based on it, this topic used the Galerk and complex modal method to research the changes of natural frequency of lateral vibration characteristics under different parameters, and comparative analyzed the effect of two methods on the natural vibration characteristics. Firstly, through an analysis on vibration mechanics model used complex modal method, the author obtained the exact solution of natural frequencies under different parameters, after that, utilized the Galerkin method to discrete the system vibration equations for getting the first N natural vibration characteristics. According to comparative analyzed the natural vibration characteristics of two algorithms, the results showed that, using appropriate Galerkin method will obtain more accurate solutions,as well as provide theoretical support on suppressing the vibration of beaded rope.

Abstract: Based on orthogonal experiment of machining the irregular surface of Wulian red granite (G3768) with diamond profiling wheel, the relations between the fractal dimensions of cutting forces with machining parameters are studied. Cutting speed, feed speed and cutting depth are considered as the process parameters. The cutting force in machining granite operation are measured and the fractal dimension are calculated using using the algorithm of correlation dimension. From main effect plots the fractal dimensions of three directions of cutting forces are reduced with the increase of cutting speed and increased with the increase of feed speed and cutting depth. The mathematic models of fractal dimension of cutting force are developed by analysis of regression. The results of the ANOVA show that cutting speed and feed speed have remarkable influence to fractal dimension D_x, D_y and D_z.

Abstract: With the development of economical society and the stone industry, the product of granite thin slab becomes a trend, and gets the welcome of people. The grinding technology influences the quality of granite thin slab. This paper first introduced the situation of the grinding technology of granite thin slab, analyzed the mechanism of the grinding process of granite thin slab and fractured problem by observing the fractured granite thin slab. Then, based on the Hoek-Brown criterion, we researched the fracture criterion and the critical thickness of granite thin slab when grinding. Finally, we set up the fracture criterion of the granite thin slab and built the mathematical model between the thickness of the granite thin slab and grinding process parameters. According to the thickness of the granite thin slab, grinding process parameters can be formulated, in order to ensure the granite thin slab no fractured.

Abstract: In the process of cutting Countertop Board with Disc Circular Saw Blades, the intersecting that generated by them was an arc, which would improve the stress state of the blade greatly, therefore the efficiency of processing was improved significantly. However, in the process of cutting, the arc formed by them would be changing with the changing of the cutting depth. For the reason that the appropriate cutting radius of the Disk Circular Saw Blades also would be changing with the changing of the cutting depth. In this document, we can get the relationship between the appropriate cutting radius and the cutting depth, as well as the relationship between the the reasonable cutting radius and the structure and size of the Disc Circular Saw Blades through the theoretical analysis and calculations on the basis of the experiment, which could provide a reliable basis for the efficient and rational use of Disc Circular Saw Blades[1].

Abstract: The reasonable functional modules partition is crucial to technical solution of function in product innovation design. Technical evolution factors are not considered in current product module partition method. The correlation of customer demand and product function unit, function unit flow correlation and function technology correlation are synthesized for function module partition in product innovation design. Based on function base expression, function chain and function structure is established to provide basis of function correlation analysis. Function correlation matrix is established by combining the correlation matrix of customer demand and product function unit, the function unit flow correlation matrix and function technology correlation matrix. The dynamic cluster analysis of fuzzy equivalence matrix is used to form function module. The function module partitions are evaluated by polymerization degree and coupling degree. The presented dynamic module partition method has strong distinguishing ability.

Abstract: It is difficult for one enterprise to separately master all the knowledge related to its product innovation design. Aiming at this problem, open innovation is introduced to product design. Key technologies of product open innovation design based on knowledge are researched. Based on the ontology expression of internal innovation knowledge, external innovation knowledge and knowledge of innovation theory, open innovation design from function to structure is achieved by gradually indexing. Each functional structure is considered as a gene. Structure innovation design is optimized by cross evolution and variation evolution, achieving organic fusion internal and external innovative design knowledge.

Abstract: Based on orthogonal experiment design, a study on the one-fourth arc special-shaped surface of Lord Red granite was conducted, the relationship between cutting speed, feed rate and cutting depth with tool wear rate and grinding force were analyzed. The research shows that tool wear rate and grinding force are basically reduced with the increase of cutting speed and aggrandized with the increase of feed rate and cutting depth. By regression analysis the empirical formulas of grinding forces are concluded, it is the theoretical foundation for on-line monitoring grinding force to optimize the processing parameters for machining irregular surface of granite.

Abstract: The granite cutting processing using diamond circular saw blades is the most extensive application processing methods. The cutting force is measured at different cutting depth ap, sawing feed rate vf and linear velocity v when the granite is cut by diamond circular saw blade by orthogonal experimental method. And the sawing force empirical formulas relative to these three variables are educed. We can obtain the experimental results as follows. The radial force Fn is greater than the tangent force Ft when ap is smaller than the circular saw blade diameter. The corresponding Fn and Ft are all smaller as the feed rate is greater at the same circular saw blade diameter. The cutting forces increase obviously as the cutting depth increases at the same circular saw blade diameter and feed rate.