Abstract: According to the particularity of balanced rocker wheeled chassis, a four wheel independent steering system was designed. The chassis of the two degree of freedom model was established, the proportional feedback control of yawing angular velocity and front wheel Angle-yawing angular velocity was simulated, the chassis steering performance under the two classic control methods was analyzed, then the dynamics of mechanical model was established in ADAMS software, the steering performance under different speed was simulated. At last, compared with two simulation results, it was proved that the steering system has good handling stability.
Abstract: As a significant control component of vehicles, automatic transmissions should have failure protection function. The failure protection function partly is determined by the hydraulic control system. However traditional design could not cover all of failures, and there is no general design method. A design method is proposed for designing the shift control oil circuit of the hydraulic control system with the failure protection function. . The design method is applied to optimize the hydraulic control system of a six-speed automatic transmission. The function of the optimized hydraulic control system is confirmed by the dynamic simulation. The results show that the design method can simplify the hydraulic control system without losing any original functions. The proposed design method is proved to be suitable for all kinds of hydraulic control systems of automatic transmissions.
Abstract: Many types of CNC lathes fault generally can be divided into five categories: CNC device fault; servo system fault; tool holder system fault; spindle system fault and other parts fault. Common fault as long as the correct analysis and judgment is not difficult to troubleshoot.
Abstract: According to the kinematics equation of the test tilter for the optical landing aid system, the velocity Jacobi matrix of the tilter is established. The determinant and the condition number of Jacobi matrix based on the numeric analysis in the preset workspace, as the evaluating indicator of the singularity and the dexterity. Simulation result indicates that there is no singularity in the tilter workspace because the determinant of the matrix is not equal to zero, and the tilter has higher rotary dexterity due to the smaller condition number of the rotational velocity Jacobi matrix. At the same time, the tilter has isotropy and the best dexterity in the vertical motion direction due to the condition number of the linear velocity Jacobi matrix is equal to 1.
Abstract: A multi-faceted introduction on current state and development trends of tumbler screening technology was proposed, which included that the origin and development of the tumbler screening machines, a comparison between tumbler screening machines and rotary vibration screens, the structure design and analysis, especially the screen mesh cleaning technology and specific machine applications. The status and development trends of tumbler screening machines in China and abroad especially in German were analyzed. The developing direction of future tumbler screening machines and the situation of Chinese businesses producing tumbler screening machines development were introduced.
Abstract: Expertise or certain performance metrics information was often separately considered to model the Aircraft baseline scenario preferential problem in a traditional way, with one-sidedness and subjective. This paper focus on baseline scenario preferential problem in aircraft conceptual design, proposed a hybrid fuzzy decision merit model with synthesizing the description and numerical fuzzy indicators and using interval theory to model the fuzziness of each attribute. Proposed the preference information method based on multi-level expertise interval scale to model description fuzzy indicators and grey incidence analysis to model numerical fuzzy indicators, induced objective information entropy to increase the discrimination degree among group information, and then established a hybrid fuzzy interval multi-attribute decision model based on expertise, grey scale and objective information entropy, by constructing the Lagrangian function to solve each attribute weights. Applied it to the aircraft baseline scenario preferred example, to verify its feasibility and effectiveness.
Abstract: exploiting marine energy is an important measure to promote "marine economy" development and maintain national security, and based on which, designed and introduced a new horizontal axis turbine marine energy generation system which mainly included energy capturing system, energy transfer system, security service system and remote monitoring system. It proved the feasibility and the high efficiency of the system from the tank experiment, which provides a reliable design idea and reference for the similar engineering project.
Abstract: Analysis has been made on the adaptive optimization design of machining center tool changing manipulator by the application of the quantitative analysis tools. Thus adaptive comprehensive evaluation index is proposed and the adaptive comprehensive evaluation model of product is established. On the basis of primary evaluation on various indicators such as Product function adaptability with methods of Multilevel Fuzzy Integrative Evaluation, then, the secondary comprehensive evaluation will be continued and comprehensive adaptability evaluation level of FV-1100A machining center tool changing manipulator will be gained, thus providing guides and evidence for further improvement of product design. Through presenting adaptive measuring values of all proposals in schematic design phase and the quantitate evaluation on the complexity of modifying the design.
Abstract: To study the fatigue damage of a cutter used for cutting cashew nut, the integrated
simulation platform is established with Hypermesh, LS-Dyna, LS-PrePost, and nCode GlyphWorks.
The simulation model is established by Hypermesh. LS-Dyna is used to calculate the k file.
LS-PrePost is used as the post-processing software. The rain-flow counting, load superposition and
extrapolation are executed using Rainflow module in nCode GlyphWorks. The analysis of the
fatigue damage of the cutter is executed using Stress Life module in nCode GlyphWorks. The
equivalent stress time history of different elements in the upper and lower cutters, rain-flow
counting histogram after load spectrum superposition, rain-flow counting histograms after load
spectrum extrapolation, and damage histogram of the cutter are obtained. The results show that the
cutter has excellent mechanical properties, and the minimum fatigue life of the cutter is about 495
days, which is a conservative solution.