Advanced Materials Research Vol. 940

Abstract: Step-type heating furnace is a kind of mechanized furnace hearth furnaces, due to the corrosion of heating furnace lifting framework is serious, which needs to repair. This article uses the Pro/E to build heating furnace lifting framework model, and then it is leaded to ANSYS which can analysis the stress of framework. Firstly, the framework model that has been corroded and damaged should be analyzed for summing up the framework’s damage and dangerous points and determining the framework reparative plan. Then framework model after being repaired needs to analyze with the same load, the analytical result of which should be compared with that of original design’s framework, and reparative plan should be corrected and examined. Finally, the reasonable framework reparative plan will be determined.

Abstract: This paper analyzes the design method of multi-position progressive die which adopts the existing product length and longitudinal overlap as the step, and proposes the design method of multi-position progressive die which is targeted at feature and adopts the longitudinal length of feature that appears most frequently in the products as one step, in order to deal with all kinds of limitation and weakness of process arrangement in the complex products with medium size. It also briefly explains the controlling procedure of punch and the classification principles of feature. The proposed method shortens the total length of the die, saves the die materials, reduces the difficulty of manufacturing the die, manufacturing cost and production cycle, and improves the stability of feeding materials and manufacturing precision of the product.

Abstract: Fault diagnosis based on multi-sensor information fusion technology processes multi-source information and data of the monitoring system in various manners such as detection, parallel and related processing, estimation, comprehensive treatment and so on so as to maximize the use of system knowledge and the information provided by the available detectable quantity of the system in fault diagnosis. Compared with the single sensor, multi-sensor information fusion enjoys obvious advantages in reducing information uncertainty, improving information accuracy obtained by the system and advancing system reliability and fault tolerance capability. As the accuracy of traditional fault diagnosis method is not high, considering the characteristics of faults in the electric starting system of self-propelled gun, a method of fault diagnosis is presented here based on network information fusion technology. The diagnostic process is divided into two level diagnosis, that is subsystem and system level. System adopts BP neural network in fault mode classification, while at system level D-S evidence theory is used in the process of synthetic decision evaluation on the entire system malfunction, ensuring accurate and fast fault diagnosis, which greatly shorten the corrective maintenance time.

Abstract: To explore the performance of the flexible nodes between the precast concrete exterior wall cladding panel and the frame structure, a steel truss is used as an analogue of the frame structure to develop a test. In the test, one precast concrete exterior wall cladding panel was installed on the steel truss, and the connection nodes are designed to be able to slip vertically. Different horizontal forces were exerted on the steel truss to form certain drifts, and the deformation of panel and the slipping performance of the connection nodes were explored. It is found that precast concrete exterior wall cladding panel won’t deform under the influence of the drifts, while the connection nodes between the frame structure and the panel were found to slip. The results show that the design of slipping connection node has enough reliability.

Abstract: For the sake of obtaining the ammunition storage and transportation shelter, that had the characteristic of rational structure, high reliability and convenient take put, it was needed to design internal structure . This paper analysed the placement of pill ,cartridge case and fuze, and designed 6 schemes of internal structure design, which was regarding the ××mm howitzer projectile as the object to study, based on the technology requirement and demand of the ammunition storage and transportation shelter ,and the ammunition characteristic. By comparing and analyzing, the strength of shelter scheme 1,4 was best. The scheme 4 was better than other schemes in reliability of fixed device and convenience of taking and putting ammunition. The scheme 4 had the characteristic of rational structure, high reliability and convenient use for force. The ammunition storage and transportation shelter applied the scheme 4

Abstract: According to the stealth and conformal requirement of flying wing UAV(Unmanned Aerial Vehicle),an dorsal subsonic S-shaped inlet with long diffuser and large offset is designed. In the light of the characteristics of the inlet, new area distribution is created. In the study, the model with power system and the other model whose pipeline connected are established. The coupled numerical simulation is also carried out on the inflow/outflow integrated for flying wing UAV, and it is applied to study the longitudinal aerodynamic performance of UAV and the flow characteristics of inlet under different flight conditions. Results indicate: The longitudinal aerodynamic performance of the model with power system is close to the model with pipeline connected, but the moment characteristic of the former is better; The inlet characteristics are similar when Ma=0.5 and Ma=0.6; As the mach number increasing, the inlet performance decreases rapidly, Especially at the Ma = 0.7, there is a large low-pressure dominated region at the small angle of attack α = 2°, which leads to the total pressure recovery coefficient decreasing rapidly and the flow distortion increasing obviously.

Abstract: All spacecraft in low orbit are subject to hypervelocity impacts by meteoroids and space debris. These impacts can damage spacecraft flight-critical systems, which can in turn lead to catastrophic failure of the spacecraft. The numerical simulations of characteristics of debris cloud produced by an aluminum sphere projectile hypervelocity impact on different material bumpers at normal incidence have been carried out by using the SPH (smoothed particle hydrodynamics) technique. The effects of impact velocity, the ratio t/d of the bumper thickness to the projectile diameter and the bumper materials on the debris cloud characteristics are presented.

Abstract: Aiming at the abnormal landing of the aircraft which caused by the invalidation of the undercarriage, a safe auxiliary system for aircraft’s forced landing is proposed. Firstly, the article introduces the basic compositions and the main functions of each part in the system, and proposes the undercarriage robot based on the aircraft arresting system and also the underground rail system based on the steam-driven catapult principle is put forward. Secondly, the detail introductions on the system’s operating principles for aiding the forced landing of aircraft are given separately from starting, docking, decelerating and separation. At last, an expert control system based on knowledge base is proposed for realizing the calculation of docking position, velocity matching and the optimal decelerating scheme.

Abstract: In order to realize the rapid-flexible manufacture of metal micro-channel radiator structure,metal micro-droplet deposition manufacture was proposed and an experimental setup was developed. The principle of pneumatic droplet-on-demand generator and the process of single droplet ejected from the nozzle were analyzed. The calculation model of forming wall thickness was established. On this basis, a micro-channel radiator structure was fabricated. The above research show that the manufacturing of micro-channel structure by micro-droplet deposition is feasible. This works offer a new manufacturing method for micro-channel radiator structure.

Abstract: Thermal characters matching optimization of the remote sensor lens materials determinates the thermal adaptive faculty of the sensor, therefore become the most important influencing factor which will decide whether the sensor can work. This paper analyzed profoundly the change of the material’s thermal parameters caused by the working temperature variation, and studied the principles and application of the athermalization manners, whose advantages and disadvantages are also exposited. Formulas are listed to illustrate the principle of the athermatilization which is realized through the reasonable matching of different materials. Design example is represented, athermatilization is achieved through the reasonable matching of optical and mechanical compensation, utilizing the difference of thermal characteristics between different materials, the design and thermo-optical analysis result are also given in the paper, the advantage of the system is the stability in the wide temperature which has no use for groupware to adjust the position of detector .Key words: materials, thermal characters, remote sensor, athermatilization, optical and mechanical compensation