Search

Absrtact Aiming at the safety problem of the hydraulic keyless sleeve coupling caused by the increase of bearing power of a ship’s CPP,studied the interference installation of coupling sleeve-cone sleeve-tail shaft for transferring torque and thrust. Firstly,analyzed the composition and working principle of hydraulic non-key sleeve coupling,then studied the thick-wall cylinder theory of the coupling interference fit,according to the formula of the stress and deformation amount at a certain diameter of the thick-wall cylinder,calculated the interference amount of coupling sleeve cone surface and axial displacement of coupling sleeve when transferring 2. 8 times rated torque. Then,calculated the tangential stress and synthesized the principal stress at the mean diameter of the sleeve-in conical surface at 2. 8 times of the rated torque,checked the strength of the coupling. Then,according to the stipulation that the maximum compressive stress of the cone surface was not more than 0. 7 times the yield strength,calculated the maximum cone surface interference and the maximum hoop sleeve axial displacement. Then,studied the influence of the installation and measurement error of the coupling on the transmission capacity. Then,considered the interference loss caused by surface roughness,selected the design values of interference and axial displacement within the allowable range of the code. Finally,studied the technical of the interference fit of the coupling. The results show that the design interference value and hoop sleeve axial displacement meets the ship inspection regulation of transferring 2. 8 times rated torque,and the cone surface compressive stress does not exceed 0. 7 times yield strength of the material,which meet the application requirements,and the research results and installation technology can be used for reference by peers.

The current experience-dominated structural design process separates the structural design from CAE analysis in the development of a new wind turbine gearbox,which leads to a quite long-term development cycle and the redundancy of structural materials.Consequently,a new structural design process is presented based on topological optimization theory and combined with CAE.Through a secondary development for Hyperworks with C# and TCL / TK language,a new process automatic system characterized by lightweight structure for the structural design of wind turbine gearboxes is developed.The operability of the system is testified by the instance of designing a planet carrier.The case indicates that the process automatic system can lead designers to finish the lightweight-oriented structural design for wind turbine gearbox parts,and the pre and post processing efficiency can increase by 90% than the current process,and the development cycle of new products of wind turbine gearbox is shorten enormously.

The modularization and serialization design idea is introduced into the method to research the design method of yaw reducer of wind power transmission system,a new configuration programs- NGW compound NGWN（ Ⅰ） is proposed,serialization basic planetary gear transmission modules are formed,the parts reusability and interchangeability of yawing reducer are enhanced. According to the definition of modular design approach,the yawing reducer planetary transmission mechanism is divided into NGW type and NGWN（ Ⅰ）type two planetary modules. The tooth number optimization model is built for both modules respectively,the same type and function but different transmission ratio planetary planets modules are formed,there are 28 species NGW modules and 9 species NGWN（ Ⅰ） modules. By the definition of serialization design method,the standard series modulus are given,the gear module series are formed. Finally,the wind power yaw reducer rapid design process is established based on planetary modules. The reference to design yaw planetary reducer in wind power transmission system is provided.

When the interference fit connection structure being applied load,its contact surface can produce small relative slip amplitude.When the relative slip amplitude is in a certain range,the fretting fatigue life would be shortened.In order to evaluate the rationality of the joint of planet carrier interference fit connection structure,the condition of interference fit fretting slip is analyzed by using Workbench.Since Workbench cannot directly get the fretting slip amplitude of certain direction or loading step,therefore a method for extracting slip vector magnitude is proposed to analyze the slip amplitude of a certain direction or loading step.The results show that,in the loading stage,the fretting slip of back-end interference contact area is in critical value range,the fretting fatigue life is shorter.The analysis results provide a reference for structural design improvement.

Improving the load sharing property of multiple planets is not only one of the effective methods to improve the large megawatt wind turbine gearbox power density,but also is the key to the design of wind turbine gearbox. Taking the latest research and development of 8 megawatt wind offshore wind power gearbox as the research object,and the rigid flexible coupling dynamics model with a gearbox of new configuration and initial parameters is established by using the ADAMS. The real dynamics analysis of functional virtual prototype is carried out to research the bearing property of planet gears and pinions,and then conduct its contained load sharing design. The load sharing of each planetary wheel and pinion is analyzed by fitting data of the extracting gear meshing force simulation data,and take center external gear in ordinary gear train and the internal ring gear in the differential gear train floating as design scheme in order to improve the system load characteristics,the results show that the performance of the load sharing is effectively improved. This study laid the foundation for the detailed structure design of high power density megawatt wind power gearbox.

Machine vision is a desirable non-contact measurement method for hot forgings, as image segmentation has been a challenging issue in performance and robustness resulting from the diversity of working conditions for hot forgings. Thus, this paper proposes an efficient and robust active contour model and corresponding image segmentation approach for forging images, by which verification experiments are conducted to prove the performance of the segmentation method by measuring geometric parameters for forging parts. Specifically, three types of continuity parameters are defined based on the geometric continuity of equivalent grayscale surfaces for forging images; hence, a new image force and external energy functional are proposed to form a new active contour model, Geometric Continuity Snakes (GC Snakes), which is more percipient to the grayscale distribution characteristics of forging images to improve the convergence for active contour robustly; additionally, a generating strategy for initial control points for GC Snakes is proposed to compose an efficient and robust image segmentation approach. The experimental results show that the proposed GC Snakes has better segmentation performance compared with existing active contour models for forging images of different temperatures and sizes, which provides better performance and efficiency in geometric parameter measurement for hot forgings. The maximum positioning and dimension errors by GC Snakes are 0.5525 mm and 0.3868 mm, respectively, compared with errors of 0.7873 mm and 0.6868 mm by the Snakes model. [ABSTRACT FROM AUTHOR]