Key Engineering Materials Vols. 579-580

Abstract: This paper using ANSYS software such as wind turbine blades and other key components of the kinetic analysis and research, the kinetic analysis method and finite element analysis software combine to validate the experimental data is reasonable. Specific contents are: wind turbine blade dynamics analysis. The wind turbine blades as slender cantilever, so you can use the ANSYS program flexible dynamic analysis modules. The module is used to calculate the alternating loads flexible body structural response, namely due to the coupling effect of making wind turbine blades load acceleration, deformation at any time are changing. Also changes with time of the blade root of force and torque, the forces and torques of the hub provides theoretical data for further analysis. In this paper, the key components that wind turbine blades for the kinetic analysis, the relevant conclusions. Wind generator system for future scientific design, blades and other key components of the failure prediction assessment provides theoretical support. Wind turbine blades rotate in the movement through the air to promote the flow of the wind energy into mechanical energy, electrical energy eventually [. Leaves the force in the system is particularly complex, by gravity, such as the formation aerodynamic pull, bend and other effects and coupling effects [. Leaves elongate resilient structure is characterized by large-scale, flexible. During operation, the fan blade damage resonance is an important reason, it is how to use the features to reduce structural failure of the fan so that the safe operation of wind power generation is one of key technologies [. Wind force generator is one of the most complex parts blades, due to its tangential short span long, flexible, and therefore prone to vibration, wind turbine blades are a variety of mechanical vibration occurs first site. Therefore, from the wind turbine operation and design considerations for wind turbine blades for stability margin analysis and linear stability analysis are important.

Abstract: The coupler is used to connect the vehicles, and to transfer and ease longitudinal force and impact force generated by the train running or shunting operation; hence it plays a vital role on vehicle-running safety. The parts of coupler are shaped by casting forming, with some forming error. The process of unlock, full open and lock, (three postures operation) are realized through the motion collision of these components. The forming error will influence the accuracy of coupler motion. However, there is no established theory or techniques to support the research towards the reliability of the motion. By making use of RecurDyn, simulation software for the 13 type coupler, authors carried out multi-body kinematics and dynamics modeling and simulation analysis, and predicted the up-lifter rod max not extract angle when the coupler is unlock with forming error. Meanwhile, authors established a basis process which contains construction and analysis of contact impact mechanism model, simulation geometry modeling, multi-body kinematics dynamics model and simulation analysis. All the efforts lead to one conclusion: the max up-lifter rod not extract angle is 25.5°,when the coupler is unlock. The outcome provides a simulation analysis method for predicting the motion veracity of railway freight car coupler with the features of space mechanism.

Abstract: The size of pulse compression gratings (PCG) is very big in the ICF system, so we obtained a large size grating by mechanically stitching small caliber gratings. And we design the splicing mechanism to be a 5-DOF Parallel Mechanism with macro/micro dual feed drive control to meet the requirements of large travel, high precision, high stability and 5-DOF of the grating tiling. The macro-moving part is designed to be the 5PTS-1PPS parallel mechanism, using the Feed Mechanism of ballscrew with Stepper Motor Drive.The micro-moving part is designed to be 5TSP-1PPS parallel mechanism, using the feed mechanism of Flexure Hinge with Piezoelectric Ceramic Actuator. We derived control algorithm of parallel mechanism by the method of the Kinematics of parallel mechanism. We analyzed the systematic error and put forward the error correction method in order to improve the positioning accuracy. At last, we designed an optical detecting system to evaluate the feasibility of this scheme, the positioning accuracy and the Stability of parallel Splicing structure. The results showed that the mechanism performance can meet the requirements of grating tiling work.

Abstract: By means of information to improve the quality of farmers, it is not only an important part of constructing the modern agriculture, but also the basic premise and guarantee to cultivate the new occupation farmers and to construct new countryside. In this paper, we analysis the significance on agricultural information to promote the occupation farmers cultivation engineering, and we use SWOT analysis method, analysis the construction of current agricultural informations strengths, weaknesses, opportunities and threatens, putting forward the suggestion that make the agricultural information as the carrier, and develop the construction of occupation farmers, it is namely promoting agricultural information resources integrating and sharing, innovating rural grass-roots information service mode, constructing rural education information service platform which is regard knowledge push as construction of core and basing on cloud computing environment of agricultural information education system.

Abstract: This paper analyzed the traditional product data structure and the lack in the product data link based on the drawings specified for the product data link of discrete manufacturing in the information integration applications, also made research on the main objective, the material in the product design and manufacturing management of discrete manufacturing enterprise, proposed the product data structure based on the material and manufacturing-oriented. Taking the material as the carrier of product data link, the paper completely and digitally defined the material during the engineering design and process design, which had the material relativity and fully of the manufacturing sequential relationship. So that PDM system was responsible for the providing and managing of the data structure of digital materials, and ERP system was responsible for managing the data structure and business data of the real materials, this would realize the non-gap product data link of discrete manufacturing enterprise in the information integration applications, erase the product data broken link between the PDM and ERP system.

Abstract: The quality of thread will directly affect the reliability of mechanical system, and the accuracy grade of geometric parameters is the judgment standard to thread quality. Thus, its particularly important to detect the geometric parameters of thread. Its a pretty mature and widely used method to measure thread parameters with universal tool-measuring microscope, but it has many shortcomings, such as tedious operation, low efficiency and the reading error. In view of the above shortcomings, the paper does some simple refits to the existing 19JA universal tool-measuring microscope. In order to improve reading speed and accuracy, the grating rulers are installed on the operating platform in two directions. CCD camera is used to get external thread image instead of human eyes and the eyepiece, which is a non-contact measurement method. A software that based on MFC of VC + + 6.0 is written, which can deal with the thread image and get the thread parameters. The experimental results show that the method can not only effectively improve the measurement efficiency but also guarantee the accuracy of measurement.

Abstract: Remanufacturing Cleaning is an important process during the remanufacturing engineering, which is unique and significantly different from the manufacturing process and has an important effect on ensuring the quality of remanufactured product. The cleanliness it achieved is an important quality index of remanufactured products, which directly affects the surface analysis, surface inspection, remanufacturing processing and assembly process and further affects the quality and cost of remanufactured products. First of all, this paper gives a systematic induction and summary on the cleaning techniques and methods of remanufacturing processes such as high-pressure water jet cleaning, ultrasonic cleaning and chemical cleaning. At the same time, the paper carries out a comparative analysis on merits and demerits of each cleaning technology. Secondly taking the remanufacturing cleaning of concrete pump truck for an example, this thesis emphasizes on introducing the cleaning techniques of pump truck vehicle cleaning and parts cleaning after dismantling, and then analysis the deficiencies of concrete pump truck cleaning from the perspective of resource and environment attribute. Finally, the paper gives development trend and prospect for the remanufacturing cleaning technology of concrete pump truck.

Abstract: This paper researched on the static and fatigue strength of a 220-ton mining dump truck steering knuckle by the method of reliability analysis, Monte Carlo and response surface. The geometrical model of the steering knuckle was established in CATIA and this model was imported into HyperMesh to obtain the finite element model of steering knuckle. With this finite element model the static strength of the knuckle was checked in the case of uneven road condition in ANSYS in order to acquire the stress nephogram and deformation map. Taking the random influential factors of the reliability into account, the reliability analysis file was compiled by the language of APDL. Then the static and fatigue strength analysis was executed by the method of Monte Carlo and response surface in the PDS module to obtain the statistical results of residual strength and fatigue life, the failure probability and reliability. Finally the quantitative calculation of the failure probability was achieved. In order to realize lightweight design and improve the economy, the knuckle was optimized in ensuring the premise of safety and reliability.

Abstract: The study on the fan impeller of the wind fire extinguisher, describes the type and structure of the fan impeller, and static strength and modal analysis are applied on the impeller by using the finite element method, replacing the traditional calculation method of strength and stiffness. The total deformation, stress distribution and vibration characteristics of the fan impeller are obtained by calculating, and these results of the solution provide reliable theoretical basis for the subsequent optimal design of the impeller.

Abstract: The traditional electric boiler does not possess heater resistance with high purity and its power factor is always less than one. In order to solve these problems, a novel semiconductor nanoelectric film was studied and used to the electric boiler. Through analysing the principle of existed electric boilers and the advantages of nanotechnology heating materials, a new electric boiler was designed based on nanoelectric film as the heating element. The three-dimensional modeling was finished for the mechanical structure of new nanoelectric boiler. The new nanoelectric boiler has excellent physical stability, high electric conversion efficiency, high power factor, high power density, and long life for using. It could have a very good market prospects in the near future.