Fan Kai Kong

Study on Laser Cladding Coatings of Ni-Based Alloy/TiC/Nickel-Coated Graphite on Steel Substrate

In order to improve the antiwear and antifriction performances of tribological metal surfaces for the extreme conditions, the composite coating has been fabricated on metal surfaces by the technology of laser cladding. In the experiment, Ni-based alloy, TiC and Nickel-coated graphite are used as the main ingredients of composite. The cross-sectional macrographs, microstructure, compositions, microhardness, tribological properties and the forming mechanism of the coating was tested and analyzed. Results show that laser cladding Ni60A/TiC/Nickel-coated graphite composite can obtain excellent coating with fully compact and uniform microstructure, and good interface with the substrate. The microhardness of the clad coating is over HV1000, which is five times higher than that of the steel substrate. The friction coefficient is reduced to about 0.4-0.5 in comparison with that of the steel substrate (about 0.7-0.8). At the same time, the wear resistance of the clad coating is also improved greatly.

The Evaluating Method for Module Partition Schemes of Complex Product Systems

Module partition of Complex product system (CoPS) usually produces a number of schemes, and how to choose the best one amongst the themes is very important. In this research, according to the features of CoPS, the multi-level evaluation indexes are built based on the DFX (design for X) method, which can evaluate the scheme comprehensively. The weight of indexes are obtained with the method of analytical network process. Then, the multi-level grey fuzzy comprehensive evaluation method is proposed to make the well-chosen decision based on the DFX multi-objective evaluation model. The evaluation method are illustrated using the partition schemes of the experiment platform of a bevel gearbox.

An Approach for Module Partition of Product

. Modular design technology is one of the ways to realize the product variety. It has been widely used in increasing fields. Module partition which has been the hot spot in and around the world is the key part of modular technology. In this paper, the combination of system clustering and the fuzzy ISODATA algorithm is used to achieve the rough-to-fine division according to the principles of module partition. Finally, the automobile security system has been taken as a case to justify the validity of the method and the result of the division accorded with the function of it.

Design Optimization of Hub for 3-Bladed Horizontal Axis Tidal Turbine

In this paper, Wind turbines knowledge, which is already matured enough, is effectively used for design of horizontal axis tidal turbine (HATT) hub. Design optimization keeping in view the shape and strength for minimum weight was done using ANSYS software. Maximum stress concentration areas are found to be the blade roots and edges of shaft connection. A novel approach is used to optimize the fillet radii along with overall thickness.

Structural Analysis of Horizontal Tidal Current Turbine Main Shaft

The structure design of the horizontal axis’ tidal current turbine whose power is 100 kW is presented in this paper. The stress condition of the tidal turbine’s main shaft was analyzed, and the analysis model of the shaft was established. Applying the engineering calculation and the finite element method respectively, the strength and stiffness of the main shaft was analyzed and checked. Under the two conditions when the main shaft rotated under rated power and rotated at low speed, the fatigue life of the main shaft was analyzed and calculated. The result shows that the main shaft can meet the requirement of the design. The analysis method is a more precise method for the research of the tidal current turbine’s shaft parts. The project has project has practical significance in engineering application in the future.

Kinematic Modeling of the Variable Vector Propeller in Type of Disk Connecting-Rods

Variable vector propeller has characteristics of small compact structure and lightweight, and the thrust in any direction can be generated due to the cyclical change of blade pitch angle. The structure of a propeller is a complex spatial mechanism, so its kinematic analysis is the basis of controlling the propeller, the dynamics research, the structural parameters design and checking of the propeller. The propeller considering the mechanism of disk connecting rod variable pitch as the basic design is researched in this study. The mechanism analysis was carried out by means of the mechanism theory, the spatial kinematic modeling for bodies was completed, the motion relationship was derived and the related kinematic equations were obtained.

The Design and Optimization of the Diversion-Type Tidal Current Turbine

For the actual low velocity flow ocean condition of tidal station, in order to obtain the clean and sustainable energy more efficiently, a diversion-type tidal current turbine, which can poly water flow under low velocity condition and achieve the function of adaptive convection, was designed. This research created the 3D model of the turbine structure, and conducted mechanical analysis of the structure with finite element analysis software ANSYS to check the reliability of the structure. Finally, the frame of the turbine had been optimized to obtain the optimal size of allowable stress.

Analysis of Static Load Sharing in Star Gearing

In order to analyze the sharing mechanism of marine high-speed star gearing system, a static mechanical model is presented in the paper, in which manufacturing errors, assembly errors, bearing errors and tooth thickness error are all considered. In consideration of equivalent mesh error and static balance of floating components, the load sharing coefficient of the system in different kinds of errors was obtained. And the sensitivities of the load sharing coefficient on different types of errors are analyzed. The result shows that the effects of the eccentric error of sun and tooth thickness error of star gear upon load sharing coefficient are larger than those of the other errors. The influences on load sharing coefficient of each error have cumulative effects. The research has provided a useful reference for improving the load sharing capability of marine star gearing system.

Kinematics Simulation of the Disc-Rod Blade Variable Vector Propeller

With the structure more compact and more lightweight, the variable vector propeller can produce propulsive force from all directions, which has important application value as a special purpose to meet underwater propulsion device. As the structure is complex in common and also with some special requirements in design and manufacture, the disc-rod blade adjustment mechanism is a concept meets the requirements. Taking the disc-rod blade adjustment mechanism as the basic design scheme, its structural analysis and basic kinematic analysis were carried out, and then the kinematics simulation was conducted on ADAMS platform. The simulation analysis results can provide necessary support for the control of the follow-up propeller devices.

Optimal Design of Gear Transmission System of Increasing Speed for Half-Direct-Drive Tidal Current Energy Station

The half-direct-drive transmission is conducted for the transmission system of tidal current power stations using a small speed-up ratio of planetary gearbox between turbine and generator. A design model is developed for the optimization of the planetary gear transmission system. And a mixed genetic algorithm is applied on the basis of fundamentals of genetic algorithm to carry out the optimization. From the example calculation, a better design scheme is obtained by the optimization.