Advanced Materials Research Vols. 295-297

Abstract: This study is an attempt to codeposit N and Cr into the surface of austenitic stainless steels by pack cementation process to simultaneously increase their surface hardness and corrosion resistance. The pack powders were prepared using Cr₂N powder as a source of both N and Cr, NH₄Cl as activator and Al₂O₃ as inert filler. Specimens of the AISI204 austenitic stainless steel were treated in the 2 wt% NH₄Cl activated 15Cr₂N-85Al₂O₃ (wt%) pack at 1100 °C for different times. It was demonstrated that a top Cr₂N layer with a Cr enriched zone underneath can be formed on the steel surface via the vapour phase generated in the activated powder pack. The effect of adding Cr powder into the pack powders on the surface layer formation and on the hardness profile at the cross-section of the specimen surface was also investigated. Hardness values of more than 1800 HV were obtained at the outermost surface of the treated specimen.

Abstract: Bio-engineering equipment are including biological reactor, the product of biological reactions and purification of material handling equipment and auxiliary systems equipment. Ventilation and mechanical agitation fermenter is a bioreactor that is widely used in plant biotechnology, according to incomplete statistics, it accounts for 70% -80% of the total fermenters, and shows the advantages of high production and high economic efficiency. the key to improve the existing equipment management system is to strengthen equipment management system, office automation and information technology capabilities, particularly in the management of large fermentation tanks, should take advantage of new technologies, new methods and new approach to management. In this paper, there are introducing seven aspect contents, and the purpose is to strengthen management of ventilation and mechanical agitation fermenter.

Abstract: PI control is also an old and classic method which is effective and mostly used in linear systems. In this paper, two assumptions are proposed to simplify the design of overload control system of supersonic missiles. No aero-coefficient is necessary to be known because of the adopting of PI control method.

Abstract: Real-time calculation of dynamics model is one of the key technologies in the driving simulator. A multi-body dynamics model of tracked vehicle was developed using the Vortex software. The sinusoid superposition method was exploited to extend the 2-D road surface spectrum and to establish the 3-D road roughness elevation data in accord with the state standard. Then the elevation data were imported into Multigen Creator to construct the 3-D virtual road. Including the vehicle model, the virtual reality system was created. In the simulation of riding comfort, the responses of the vehicle were obtained when the vehicle traversed under road excitation of D grade with constant speed. The result shows that the system offers good immersion and real-time performance. It is feasible to be applied to the tracked vehicle driving simulator.

Abstract: In driving simulator, the driver manipulating the steering wheel can not only be feeling authentic as the real vehicle but also get additional information of the vehicle state and road conditions. For this purpose, a steeling wheel system was detailed designed. A bicycle model was used to analyze the dynamic behaviour of a simplified four-wheel vehicle model and applied to compute the reaction torque. After modeling the steering column and the feedback motor, the state equation of the steering wheel was deduced. The control without PID, with ordinary PID and RBF network PID were adopted to control the feedback motor to generate desired torque. Simulation in matlab/simulink shows that the steering wheel has good performance and the RBF network PID controller has better performance and can satisfy the requirement of the reaction torque. This study will be a guide research for future driving simulator.

Abstract: Comparing with traditional adaptive methods, a very simple PI sliding mode controller is designed for uncertain nonlinear missile systems with the help of two main assumptions which are also testified to be reasonable.The construction of PI control for sliding surface is novel and effective. Also, the proof of PI type control law is unique in this paper.

Abstract: Taking potential debris flow in Huyu Valley as research object, the investigation of geological condition in Huyu Valley and different accompanied geological processes has been investigated such as complex topography, natural weathering and source of loose debris produced by the accumulation of human engineering activities, the role of uneven rainfall. With the analysis of potential debris flow characteristics of the Huyu Valley comprehensively, the results showes that the potential debris flow of the Huyu Valley already has satisfied conditions.

Abstract: The buildings are constructed on the slope side, to avoid digging massively fill geotechnical Engineering, according to the slope potential's change, the pile foundation makes not the contour form generally, when the subsoil water level rises or the reservoir stores, partial pile bottom is often under the water level,which causes the ground the supporting capacity and the rigidity to change.Adds it when the structural design “the pile- earth-superstructure” will be separated from the consideration frequently, even if considering it together frequently also often neglects the influence of the water level change on the overall construction.As the accident which according to this design's construction structure the dehiscence or the entire construction collapse sometimes occur. In order to avoid this kind of accident's occurrence, we must make it clear that the influence of the water level change on the structure supporting capacity. Based on this, this article takes some storehouse ashore 8 portal frame construction's pile foundation as an example, through finite element software establish “pile-earth-superstructure” three-dimensional moldel, the model analyzes the pile, the earth and the superstructure internal force and displacement's change under the water level change. The analysis result indicated that the water level change causes the structure the internal force and the distortion increases,particularly the pile foundation exists changes the region highly the superstructure.When construction structural design should be considered fully the influence of the groundwater level change on the superstructure,thus makes the structural design be safer reasonably

Abstract: In this paper, TRIZ and knowledge management, the two instruments solving innovation problems of different thinking modes are combined for the first time to construct Customer Knowledge Management platform. This platform has powerful functions, high efficiency, short response time, good expandability and so on, while its performances will be improved with its application time increasing. The platform can keep on being used with the advent of new assistant innovation instrument and its ability to solve problems can be ameliorated. The key to use this platform is the selection of initial knowledge management system.

Abstract: Electrochemical discharge machining (ECDM), based on electrochemical machining (ECM) and electrodischarge machining (EDM), is an unconventional micro-machining technology. In this paper, with the use of water, the process of micro hole on ANSI 304 stainless steel machined by micro-ECDM with high speed rotating cathode is studied. The effects of machining conditions such as the cathode rotating speed and cathode diameter on the surface quality and accuracy of the shape are investigated. The results indicate that a relatively higher electrode rotating speed can improve the machining accuracy of the micro-holes and reduce the electrodes wear.