Papers by Keyword: State

Abstract: The cutting process was presented as a real object as well as its physical and mathematical modelling. For the description of the non-linear phenomena, at the typical increment ratio, the updated Lagrange's description was used. Adequate deformation and stress increments measurements were used, e.g. Green-Lagrange's deformation tensor increment and the increment of the Piola-Kirchhoff's second symmetrical tensor. Nonlinearity of the material was described by means of the increment model taking into consideration the deformation and deformation rate records. The workpiece is treated as a body in which there may be elastic deformation (in the range of reversible deformation) and visco and plastic (in terms of irreversible deformation), with nonlinear hardening. For the construction of the material model Huber-Mises-Hencky's non-linear plasticity condition was used, associated principle of flow as well as mixed hardening (isotopic-kinematic). The condition of the material after pre-machining processes was also taken into account by means of implementation of initial conditions of: displacement, strain and stress. Yield stress of the body was described by a Cowper-Symonds' model allows for linear-isotropic, kinematic or mixed plastic strain hardening and the effect of the intensity of plastic strain velocity. The applications in ANSYS program and results of numerical calculations were presented. A method of generating a three-dimensional abrasive grain with a geometry close to actual were describes. The influence of the process parameters on the states of strains and stresses and on the quality of the product was presented. Numerical calculations of cutting process with single abrasive grain were made and investigated the deformation and stress occurring in the workpiece. The experimental test stand of single abrasive grain cutting process, the test plan and the verifications of results of numerical simulations were describes. The results were statistically developed and that’s give the models in the regression function form.

Abstract: The following article looks how the climate changes influence on dangerous industries. Global warming provokes natural disasters - hurricanes, tsunami, earthquakes – that have negative influence on ultra dangerous industries. In the article particularly there is an example of Japanese “Fokusima – 1” atomic power plant accident which was caused by the earthquake and tsunami. In economics theory there are two points how to reduce ecological risks. The first one is based on state restrictive measures – financial instruments. The second point is based on business adaptation branches of economy, in particular, mechanical engineering to constantly changing climate conditions of management. The article suggests economical strategy which combining resources of state, business, scientific institutes and non-profit organizations to reduce the risk of technogeneous disasters.

Abstract: Frequent land-use changes might produce a large amount of historical data which are valuable for data mining and decision-making. Based on the traditional Whole-state-recording Mode, the Special-state-recording Mode was proposed, focusing on the temporal aspect. This mode could optimize the land use database and reduce redundant change record. It could also improve data rollback and historical backtracking functions. The mode was successfully applied to land use planning in Zhejiang Province.

Abstract: This paper addresses the observer design for simultaneously estimating the state and input of a class of impulsive systems whose nonlinear terms satisfy an incremental quadratic constraint. By employing Lyapunov theory, sufficient conditions for asymptotical and exponential estimation convergence are derived. Gain matrices of the proposed observer can be obtained by solving linear matrix inequalities (LMIs).

Abstract: Supply chain risk produces and develops with the operation of supply chain. Its characteristics are dynamic and conductivity. In recent years, supply chain risk events occur frequently and cause serious consequences. It makes industry and academia pay much attention on conductive effect of supply chain risk. State space method is introduced in estimating of supply chain risk in this paper. The model of supply chain risk based on state space is given. Then we discuss the prediction error of the system.

Abstract: This article is devoted to the principles of power equipment technical state assessment at 35-220 kV substations. The article deals with the network hybrid model construction using methods of fuzzy logic and artificial neural network. Finally, in order to construct the knowledge base, a methodology of the power equipment technical state assessment, based on the membership functions, is introduced.

Abstract: The component array is a group of components that implement the same functions but provide different qualities. These component implementations can be switched at runtime for satisfying different user requirements and coping with environment changes. However, the design of component arrays is completely performed by hands of developers, which is complex, time-consuming, error-prone, and is poor at keeping up with the actual runtime conditions. This paper presents a scenario-driven state-based approach to modeling component arrays for satisfying requirements of predictable qualities. The automation of four vital steps of this approach is dependent on the interaction based modeling and state-machine based modeling. The approach is illustrated with UML (Unified Modeling Language) and the demonstration and experimentation are implemented on JEE (Java 2 Platform Enterprise Edition).

Abstract: This document established evaluation of the Yellow River delta wetland ecological health with PSR model, the DPSIR model and index system. Based on research of Yellow River delta wetland and relevant expert scoring, the paper selected 23 indicators, such as wetland pressure, state, response. all the index weights results was completed by analytic hierarchy process (AHP). Ecological health protection strategy was proposed according to the model.

Abstract: The purpose of this work is to develop a graphical method for describing the work-in- progress (WIP) material flow of a workpiece in order to realize RFID-driven real-time data sampling and support following-up Auto-ID computing. Firstly, various processes in a job-shop floor are formalized graphically by using different types of state-blocks, which depend on RFID detecting spaces and tag detections. And then an event set is deduced from the connecting relations among state blocks and is used for creating the event-driven graphical model in the context of the WIP material flow of a workpiece. To verify the feasibility of the proposed method, a description case is given.

Abstract: A state time delay always exists in practical systems. Analysis of the delay phenomenon in a continuous time domain is sophisticated. It is appropriate to obtain its corresponding discrete time model for implementation via a digital computer. A new method for the discretization of nonlinear systems is proposed in this paper. This method is applied to the sampled data representation of a nonlinear system with constant state time delay. The proposed scheme provides a finite dimensional representation for nonlinear systems with state time delay enabling existing nonlinear controller design techniques to be applied to them. A performance of the proposed method is evaluated using a nonlinear system with state time delay.