The analytical solution of a boundary-value problem of heat conduction for tribosystem, consisting of the homogeneous semi-space, sliding uniformly on a surface of the strip deposited on a semi-infinite substrate, is obtained. For materials of frictional systems: steel–aluminum–steel and steel–zirconium dioxide–steel, the evolution and distribution on depth from a surface of friction for temperatures and thermal fluxes, is studied.
"The homogeneous upper semi-space slides with velocity V(t) in the direction of y-axis on the coating surface. Then, the dimensionless governing equations and the associated boundary and initial conditions for the system can be written as  "
[Show abstract][Hide abstract] ABSTRACT: In this study, an inverse algorithm based on the conjugate gradient method and the discrepancy principle is applied to estimate the unknown time-dependent frictional heat flux at the interface of two semi-spaces, one of them is covered by a strip of coating, during a sliding-contact process from the knowledge of temperature measurements taken within one of the semi-space. It is assumed that no prior information is available on the functional form of the unknown heat generation; hence the procedure is classified as the function estimation in inverse calculation. Results show that the relative position between the measured and the estimated quantities is of crucial importance to the accuracy of the inverse algorithm. The current methodology can be applied to the prediction of heat generation in engineering problems involving sliding-contact elements.
[Show abstract][Hide abstract] ABSTRACT: Summary form only given. Since the 1990s began, profound changes have taken place in the world pattern, and the competition in science and technology is becoming the core of international strife. Therefore, R&D funds have become the essential condition so that a nation acquires long-term competitive advantage and international competitiveness. It is very important for a country to timely adjust its structure of R&D funds on the basis of its characters and national need. Based on this view, this paper compares the three aspects of structural transformation process, i.e. the structure of R&D funds by source, the structure of R&D funds by performing sector, and the structure of R&D funds by character of work in China and the US. The main conclusions are listed as follows: (1) the structure of R&D funds by source in the US has gone through three phases from government-dominance type to industry-dominance type since the 1960s. The same trend happened in many other developed countries. In contrast, the structure of R&D by source in China still belongs to typical government-dominance type. (2) The structure of R&D funds by performing sector in the US and many developed countries turned traditional “single-assistant” type into “double-assistant” type in order to fit the new technology-economy paradigm shift. However, in China the structure of R&D by performing sector just pertains to an institute's dominance far away from single-assistant type. (3) The structure of R&D funds by character of work in the US stresses the stability of R&D system and has a high share of basic research. But basic research in China is very weak
[Show abstract][Hide abstract] ABSTRACT: This paper presents a recent study of avionics system design and implementation for small aircraft. Avionics system is one of the most important systems to all kinds of aircraft. For digital avionics system integration, a hybrid data bus is proposed in this development. The proposed hybrid data bus (HDB) adopts some characteristics from time trigger protocol (TTP) in conjunction with the controller area node (CAN) to simplify the data bus structure and enhance system reliability in the applications. The proposed hybrid data bus system is designed and fabricated for test as a preliminary solution. In addition to data bus system, a virtual flight instrument with geographic information system (GIS) is integrated into cockpit display together with mobile communication surveillance for low altitude flight. The overall system integration brings in new era of digital avionics for small aircrafts.
Digital Avionics Systems Conference, 2005. DASC 2005. The 24th; 01/2005
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