Applied Mechanics and Materials Vols. 278-280

Abstract: Based on the inverse problem theory of heat conduction, thermal conductivity of heat-insulation oil pipe coupling is researched in the paper. The finite volume method is extended to solve the direct problem, and the 0.618 method is used to solve the inverse problem by optimizing the objective function. The results show that by using the method, taking the outer wall’s temperature as the sample indicators, the thermal conductivity and the temperature distribution of heat-insulation oil pipe coupling and the temperature distribution of heat-insulation oil pipe can be obtained easily and accurately.

Abstract: In order to achieve the lightweight of fuel cell car, and through topology and size optimization on the current sub-frame, we have changed the original design structure under the premise of the requirements to meet the stiffness and strength in various operating conditions, which made the structure light weight and reliable. Analysis showed that the new sub-frame technology is feasible, which meet the technical and assembly requirements, and achieved the optimal goal.

Abstract: The paper was conducted to solve the low machining accuracy of eccentric parts and thin-walled parts on tomato harvester, reduce the machining steps of thin-walled parts and eccentric parts, and promote the machining accuracy and labor productivity, a special fixture was designed. High concentricity machining was applied based on adjusting the fixture, and manufacturing workpiece didn’t need to dismount, thus the concentricity and machining accuracy of manufacturing workpiece can be achieved. It’s beneficial to improve productivity and production quality.

Abstract: Through the set up of a calculation model on film cooling in the primary zone of an annular combustor, a parametrical study was made on the relationship of film cooling effectiveness and wall temperature with configuration parameters such as cooling slot height and TBC thickness. Through parametrical study, it can be seen that with all the parameters kept the same and even the resulting effectiveness of the outer liner slightly greater due to a slightly higher blow ratio, the outer liner temperatures are considerably higher than the inner liner temperatures. The calculation shows, with cooling effectiveness, there are optimum values of coolant injection angle and film cooling slot height, while there is a monotonous tendency for the relationship of cooling effectiveness with other parameters such as tapered angle on nugget lip, starting edge angle at nugget-slot exit and lip thickness .The study demonstrates that the higher the TBC thickness, the lower the highest value of base metal temperatures, but when the TBC thickens, it becomes heavier, and the possibility of TBC spallation gets greater.

Abstract: The structure and working principle of permanent magnetic brake were introduced and the main factors of influencing braking ability of the permanent magnetic brake were analyzed with theory formula. By using of software as Ansoft, an finite element simulation model for magnetic brake were built up, and compare simulate value with theoretical one express that they have better consistency. Based on the simulation model, influencing factors of the braking force about permanent magnetic brake were analyzed, and the simulate results express that the height of gap between brake and track has a great influence on the braking force, so it must pay much more attention on brake design.

Abstract: The paper deals with a mathematical model suitable for the hardware emulator of a microturbine power unit, which serves the design, optimization, and verification of control equipment. The emulator interface signals mimic the operation of a real turbine including the electrical parameters of interfaces. A system of algebraic-differential equations representing the turbine model is formulated such that it allows applying an explicit solver with a predictable amount of operations to obtain the next time step, which is important for the real-time simulation. The model includes the starter motor, generator, gearbox, and single-shaft gas microturbine. In addition to the normal operational performance the instrument allows simulating various faults.

Abstract: Through analyzing the design methods of liquid sliding bearing and the matching spindle of common roller grinding head, the design methods and ideas of liquid sliding bearing and the matching spindle of high-speed roller grinding head are put forward, and on these bases, a kind of liquid sliding bearing and the matching spindle of high-speed roller grinding head are designed. By means of finite element analysis of the bearing and the matching spindle respectively, it can be known that thermal property of the designed liquid sliding bearing can meet the working demands of high-speed roller grinding, and the designed spindle can meet the demands of strength and stiffness under the condition of high-speed grinding, thus, important reference materials for forming core technologies of high-speed roller grinding head are provided.

Abstract: Based on the virtual prototype technology, using the ADAMS vibration analysis module, the displacement response rule of the main mechanism of the cutting system excited by sinusoidal harmonic excitation is obtained. And through the analysis of the results, the fact that 20HZ, 29HZ, 120HZ and 134 HZ are the sensitive frequency of the main mechanism is found out. Using the hammer test modal analysis methods to analysis cutting system of EBZ-75 type boom-roadheader, and compared with simulation results, the sensitive vibration frequency in vertical direction of the cutting system is achieved, which provides a test reference data for the optimize design of the cutting system.

Abstract: For improving the dynamic characteristics and reliability of the face gear, the finite element of the face gear was established with NX Advanced Simulation based on the theory of vibration mechanics and finite element method. the former 12 ranks of natural frequencies and shapes were calculated by using NX. Nastran solver, The results provided a direct theoretic basis for improving the design of the face gear. And it laid a foundation of dynamic response calculation of face gear at the same time.

Abstract: A new type of electromagnetic linear actuator for vehicle active suspension was designed, with the characteristics of large stroke and force and fast response. Combined with the finite element analysis software, the finite element model of the electromagnetic actuator was built up. Based on the simulation results, a prototype of electromagnetic linear actuator with appropriate parameters was developed. And the electromagnetic force test of the actuator was done. By comparison of the finite element simulation results and the experimental data, it shows the corresponding results are consistent, indicating that the design and analysis of the electromagnetic actuator is correct.