Papers by Keyword: Interval

Abstract: The existing high-density distributed distribution network single-phase earth fault interval location method has the disadvantage of long positioning time. Hence, a single-phase earth fault interval positioning method for high-density distributed distribution network is proposed to solve this problem. In order to accurately locate the single-phase earth fault interval of distribution network, zero-order equivalent model of distribution network is built at first. Next the clustering algorithm is used to extract the single-phase earth fault characteristics, while the single-phase earth fault phase current increment is calculated by using the analysis method to obtain the single-phase earth fault phase current increment law. Then a fault-maximum interval T-shaped structure is built to divide the potential fault interval. Finally, the S-transformation is applied to accurately locate the single-phase earth fault interval, and the localization of the single-phase earth fault interval of the high-density distributed distribution network is achieved. The experimental results show that comparing with the existing high-density distributed distribution network single-phase earth fault interval positioning method, the proposed high-density distributed distribution network single-phase earth fault interval positioning method dramatically reduces the positioning time. It is fully explained that the proposed method in this article has a better positioning effect.

Abstract: The process of pricing a new product is quite challenging since it involves several factors which are blended with uncertainties caused by dynamic condition. The decision of product pricing will effect to the competition ability in the market. However, since the factors are blended with uncertainties, it is necessary to develop a system that could model the uncertainties for obtaining reasonable price. This study focuses on modelling the uncertainties using Fuzzy Logic Type-2 (FLT2). The reason of the use of FLT2 instead of FLT1 is because of the ability of FLT2 to cope with uncertainties better compared to the FLT1. This study refers to a previous study that was conducted by Haji and Assadi in 2009 in determining the factors that affect to a new product pricing. A new important factor that has not been considered in such study has been added in this study, which is product warranty. The result shows that the proposed FLT2 able to model uncertainties in product pricing and resulting reasonable price for a new product.

Abstract: Expertise or certain performance metrics information was often separately considered to model the Aircraft baseline scenario preferential problem in a traditional way, with one-sidedness and subjective. This paper focus on baseline scenario preferential problem in aircraft conceptual design, proposed a hybrid fuzzy decision merit model with synthesizing the description and numerical fuzzy indicators and using interval theory to model the fuzziness of each attribute. Proposed the preference information method based on multi-level expertise interval scale to model description fuzzy indicators and grey incidence analysis to model numerical fuzzy indicators, induced objective information entropy to increase the discrimination degree among group information, and then established a hybrid fuzzy interval multi-attribute decision model based on expertise, grey scale and objective information entropy, by constructing the Lagrangian function to solve each attribute weights. Applied it to the aircraft baseline scenario preferred example, to verify its feasibility and effectiveness.

Abstract: This paper shows the groundwork of correct interval of lubrication the bearing and its impact on the operating and technical status. The method of monitoring vibration in frequency range from 0 to 200 Hz was selected for determining the technical state of bearing. The bearing was monitored and lubricated every month during the half an year except one month.

Abstract: This paper describes an integrated MEMS IMU and GNSS system for vehicles. The GNSS system is developed to accurately estimate the vehicle azimuth, and the integrated GNSS/IMU provides attitude, position and velocity. This research is aimed at producing a low-cost integrated navigation system for vehicles. Thus, an inexpensive solid-state MEMS IMU is used to smooth the noise and to provide a high bandwidth response. The integration system with uncertain dynamics modeling and uncertain measurement noise is also studied. An interval adaptive Kalman filter is developed for such an uncertain integrated system, since the standard extended Kalman filter (SKF) is no longer applicable, and a method of adaptive factor construction with uncertain parameter is proposed for the nonlinear integrated GNSS/IMU system. The results from the actual GNSS/IMU integrated system indicate that the filtering method proposed is effective.

Abstract: The spectral representing accuracy with different wavelength range and sampling interval were analyzed in this study. The spectral reflectance of different color sets were measured. The CIELAB and CIEDE2000 color differences under CIE standard illuminants and actual lighting sources were calculated to evaluate the representing accuracy among the spectral reflectance with various wavelength ranges and sampling intervals. Results of the experiment indicate that the representing accuracy of the spectral reflectance with different wavelength range and sampling interval were affected by the media type. As a whole, the colorimetric representing accuracy of the spectral reflectance with the range of 400 to 700nm and 10nm~30nm sampling intervals are acceptable comparing to the 380 to 780nm range and lower sampling intervals.

Abstract: In view of target attribute value for different sector number, moreover, also attaches a target constraint condition kind of mix sector multi-attribute decision making question, this paper presents set pair analysis decision-making method. Firstly this paper puts forward three typical interval type attribute value representation; Then using set pair analysis theory, the interval type attribute value unified convert the correlate form, Finally has given complex decision-making criterion function, which collected Conformity degree criteria and Criteria for membership degree. Through the construction plan changes decision-making example analysis shows that this method is a simple and effective method for solving multiple attribute decision making.

Abstract: For the problem that interactive genetic algorithms lack a way of measuring uncertainty of comment, a method with grey level for uncertainty of individuals evolutionary is proposed in this paper in which the individual fitness is an interval. Through analyzing these fitness grey level, information reflecting the distribution of an evolutionary population is abstracted. Based on these, the adaptive probabilities of crossover and mutation operation of an evolutionary individual are proposed.

Abstract: In this paper, the stability of systems with interval time-varying delay is investigated. The time delay varies in an interval. By employing a new and tighter integral inequality and constructing an appropriate type of Lyapunov functional, the delay-dependent stability criteria are derived. Because neither any model transformation nor free weighting matrices are employed in the theoretical derivation, the developed stability criteria significantly improve and simplify the existing stability conditions.

Abstract: Based on the CBR technique and the characteristics of developing corrosion inspection tasks and intervals of aircraft structural items, a new method which can determine the initial scheduled preventive maintenance tasks and intervals of aircraft structural items is given, and is implemented by the tools of object -oriented program design method and visual C++ language. Finally, an example of wing assembly of some model of aircraft in china is given in order to validate the feasibility of this system. The results indicate that the CBR-MTI system can establish the maintenance tasks and intervals quickly, and its consequences are more consistent with the actual situation because all maintenance tasks and intervals in the case-base have been validated by the actual operation of other aircraft.