Applied Mechanics and Materials Vols. 701-702

Abstract: In this paper, we present a fault diagnosis method for nitrogen furnace. According to the analysis of the typical faults of the nitrogen furnace, we use the sensor of programmable logic controller to obtain its circuit parameters, send them to industrial control computer, and diagnose the faults using the configuration software. Experiments demonstrate that our method can collect, display, storage, and diagnose the fault information in a real time, which confirm its potential applications in the nitrogen-chemical industry.

Abstract: The uneven friction of brake disk leads to the brake failure, which frequently results in serious traffic accidents. Based on the excellent wear-resisting properties of locust’s non-smooth surface structure, bionic brake disc with special surface micro-structure was designed. Utilizing ANSYS Workbench, the braking time and the stress distribution of both the bionic model and the smooth model during the whole process of brake under different initial velocity were analyzed. Compared to the smooth model, results showed that the braking time and contact stress decrease in a certain extent, indicating brake disc with special surface micro-structure exhibits relatively excellent braking performance and wear resistance. The results provided theories for exploring an optimization the method used to design brake discs with excellent braking performance and wear resistance.

Abstract: This paper expounds the concept and application of tubing flushing, and compares different methods of new tubing cleaning for the equipment and process technology, such as the electromagnetic induction heating oil pipe cleaning, far infrared preheating washing, high-pressure water jet flushing and high efficient heating oil pipe scouring, so the theoretical result can provide guidance for the work.

Abstract: According to the three-wheeled high clearance sprayer on the current market, the traditional empirical design method can hardly be used for effective stress distribution calculation and structural optimization, so it leads to the unreasonable structural design. Based on the overall structure of the sprayer design, a new-type high clearance sprayer designed, It is mainly composed of the engine-powered diaphragm pump power transmission parts, the power steering of scalable universal joint, the rear wheel steering mechanism and other components. Meanwhile, the finite element analysis and structural optimization on the sprayer frame have been finished. Therefore, the results showed that the frame realized the lightweight on the premise of the demand of performance and stiffness, each mechanism’s matching performance of sprayer meets the design requirements, and this approach provides a beneficial investigation into the future sprayer design.

Abstract: This paper presents a new design scheme about the bearing transmission components based on compliant parallel spring mechanism, which is applied to small and medium scale impulse plate flowmeters. The detection components can be effectively carried with a more accurate trace of displacement in the horizontal direction. The mechanism design has advantages of no relative motion and friction between the structure components, and is well adapted over the traditional bearing components, based on the principle of compliant parallel spring mechanism. Thus, the measure precision of impulse plate flowmeter and working reliability are effectively improved. Firstly, the characteristics of displacement, strength and natural frequency are analyzed theoretically, and then the simulation of static strength, modal and fatigue are performed by the CAE software. The rationality and feasibility of this design scheme are further verified by the simulation results, which has certain guiding significance for the design of the actual product.

Abstract: Thin wall parts are used more and more extensively in industrial production, analyze the influence of precision machining of thin-walled parts not higher factor, through the example of how to improve the machining precision of thin-wall parts, and gives the specific measures to solve practical problems.

Abstract: Ultra-precision machining and large-size equipments are the most primary development trend of current machine tool and hydrostatic products are key technologies of ultra-precision machining equipments. However, these equipments mostly process miniature components, thus the adopted tools are relatively small and the spindles are mainly built-in types of HSK32-HSK25 with over 30,000r. Some processing equipments are even equipped with hydrostatic or gas-static spindles. The study extends the axial oil chamber to radial ones to expand the action area of axial oil pressure and form a closed oil seal edge by combining the radial clearance. Consequently, the axial bearing stiffness can be enhanced to enlarge the application scope of hydrostatic spindle. The design mode can enhance axial stiffness of spindle modules or strengthen the stiffness of hydrostatic spindle in a ball screw.

Abstract: Swivel spindle head is a key component used in five-axis machine tool of high performance and is of great importance in application and design. Nowadays, more and more components are manufactured by high performance multi-axis CNC machine tools, such as components of spaceflight, renewable energy and automobile, etc. Therefore, high performance machine tools of multiple axes are more and more urgently demanded, while Swivel spindle head is one of the most important components for a multi-axis machine tool. Hence, Swivel spindle head is one of the key to developers multi-axis machine tool . The study explores the highly responsive direct-driving motor able to drive the spindle head to rotate with multi-driving rotary technology. The dual-driving motor rotates via multi-driving units, generates torsion that magnifies and eliminates its clearance, and then drives the spindle head to rotate. Results of the test show that the completed machine tool can meet the standards of dual axis rotary head with high preformation in, no matter, speed, distance, positional accuracy, repeated accuracy or maximum torque, etc.

Abstract: The stress-strain relationship of EPS board was analyzed. Theoretical analysis and numerical simulation (FE ABAQUS) were conducted to investigate the load reduction mechanism using EPS and soil arch effect of high fill culvert based on the constitutive relation of EPS board. The results show that the numerical analysis results are consistent with the theory analysis. It shows that the soil arch forms over the culvert top and partial weight of the soil column exactly over the culvert has been transferred to the outer soil column via the soil arch during the yield stage of EPS board, which produce large deformation. Furthermore, the numerical simulation by using particle flow discrete element software (PFC^2D) was conducted to investigate the soil arch effect over the culvert top. The research reveals that the EPS board is at elastic state and the soil arch effect on culvert top is not obvious at low fill. With the increasing of the fill over the culvert, the EPS board becomes into the yield state, the soil arch effect over the culvert increases and the earth pressure on culvert reduces gradually.

Abstract: Recently, we proposed an innovative switch architecture called Contention-Tolerant Crossbar (CTC) switch. It is able to tolerate conflicts in switch fabric. The schedulers of CTC are distributed in inputs and operate independently and in parallel, which releases the central controller and cooperative arbiters, and largely reduces the hardware complexity. In this paper, we discuss a general model by discussing a CTC structure with X inputs and Y outputs called (X, Y)-CTC Structure. And a queueing network model is developed for analyzing the throughput of this general structure. Since it has the main characteristics of CTC, it can be seen as the basis of modularity study of Contention-Tolerant Switches.