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排序方式: 共有83条查询结果,搜索用时 0 毫秒
1.
In this paper, an adaptive type-2 fuzzy sliding mode control to tolerate actuator faults of unknown nonlinear systems with external disturbances is presented. Based on a redundant actuation structure, a novel type-2 adaptive fuzzy fault tolerant control scheme is proposed using sliding mode control. Two adaptive type-2 fuzzy logic systems are used to approximate the unknown functions, whose adaptation laws are deduced from the stability analysis. The proposed approach allows to ensure good tracking performance despite the presence of actuator failures and external disturbances, as illustrated through a simulation example. 相似文献
2.
Emira Nechadi Mohamed Naguib Harmas Najib Essounbouli Abdelaziz Hamzaoui 《国际自动化与计算杂志》2013,10(4):281-287
Power system stability is enhanced through a novel stabilizer developed around an adaptive fuzzy sliding mode approach which applies the Nussbaum gain to a nonlinear model of a single-machine infinite-bus (SMIB) and multi-machine power system stabilizer subjected to a three phase fault. The Nussbaum gain is used to avoid the positive sign constraint and the problem of controllability of the system. A comparative simulation study is presented to evaluate the achieved performance. 相似文献
3.
Energy consumption for developing countries is sharply increasing due to the higher economic growth due to industrialisation along with population growth and urbanisation. The increasing demand of energy leads to global energy crisis. Selecting the best energy technology and conservation requires both quantitative and qualitative evaluation criteria. The fuzzy set-based approach is one of the well-known theories to handle fuzziness, uncertainty in decision-making and vagueness of information. This paper proposes a new method of intuitionistic fuzzy analytic hierarchy process (IF-AHP) to deal with the uncertainty in decision-making. The new IF-AHP is applied to establish a preference in the sustainable energy planning decision-making problem. Three decision-makers attached with Malaysian government agencies were interviewed to provide linguistic judgement prior to analysing with the new IF-AHP. Nuclear energy has been decided as the best alternative in energy planning which provides the highest weight among all the seven alternatives. 相似文献
4.
钢筋与钢纤维混凝土的黏结滑移性能及其关系模型 总被引:1,自引:0,他引:1
基于内贴应变片的钢筋与钢纤维混凝土局部黏结试件的拉拔试验,研究钢筋与不同强度钢纤维混凝土的黏结性能。通过对实测钢筋应变的分析,建立了以三次多项式表达的黏结应力分布函数,得到了各级荷载作用下钢筋与钢纤维混凝土黏结应力和相对滑移沿黏结区段的分布,进一步分析了钢纤维和混凝土强度对黏结性能的影响。结果表明,随钢纤维的体积率和混凝土强度的增大,黏结试件加载端附近的黏结应力提高,黏结应力极值总体向加载端靠拢;同时,加载端与自由端的滑移减小。最后,提出了能够较好反映钢筋与钢纤维混凝土受力过程的黏结-滑移关系模型。 相似文献
5.
Najib A. Odhah Kamal H. Awadalla Moawad I. Dessouky Fathi E. Abd El-Samie 《International Journal of Wireless Information Networks》2011,18(3):158-170
In this paper, frequency domain pre-equalization (Pre-FDE) is developed for broadband cyclic prefix-code division multiple
access (CP-CDMA) as a single carrier transmission scheme, and for multi carrier-CDMA (MC-CDMA) and orthogonal frequency division
multiplexing (OFDM) as multi carrier transmission schemes. A comparison study is held between these schemes and the traditional
equalization schemes. Experimental results show that pre-equalization improves significantly the performance of the single
and multi carrier communication systems with a very low complexity at the receiver. The comparative study between MIMO pre-equalization
for single carrier systems and for multi carrier systems shows that MIMO pre-equalization for single carrier systems outperforms
that for multi carrier systems in terms of bit error rate (BER) performance since single carrier transmission has more frequency
diversity than multi carrier transmission in the uncoded case. 相似文献
6.
7.
N. Suhaila A. Japar M. Aizudin A. Aziz Mohd Najib Razali 《Egyptian Journal of Petroleum》2019,28(1):91-96
This study aimed to formulate fumed silica (FS) grease using waste transformer oil (WTO) and to investigate the grease properties. Various unexplored application of the reused WTO due to its reusable characteristic. WTO and fresh transformer oil (ITO) were used as grease base fluid and the properties of oil and grease were evaluated using ASTM International standards and SKF’s Grease Test Kit. The oil and grease chemical compound were determined using Fourier Transform-Infrared Spectroscopy at wavenumber of 500–4000?cm?1. It was found that WTO have high viscosity index of 96 and low moisture content of 0.05% after pre-treatment than ITO. FS greases with and without MoS2 were classified as NLGI 2 greases when FS content was 8%. Grease formulated with MoS2 shows better performances in term of corrosiveness, oil bleed within ?15% to +15%, oil separation less than 4%, and dropping point of >300?°C. FTIR results shows no significant different between ITO and WTO, and between all formulated greases. Based on the findings, it was concluded that WTO can be utilized as an alternative base oil in grease formulation due to the good properties exhibited by the formulated WTO-based FS grease blended with MoS2. 相似文献
8.
Mohammad Mehdi Rashidi Najib Laraqi Seyed Majid Sadri 《International Journal of Thermal Sciences》2010,49(12):2405-2412
In this study, the problem of mixed convection about an inclined flat plate embedded in a porous medium is performed. The similarity transformations are applied to reduce governing partial differential equations (PDEs) to a set of nonlinear coupled ordinary differential equations (ODEs) in dimensionless form. An efficient mathematical technique, called the differential transform method (DTM), is used to solve the nonlinear differential equations governing the problem in the form of series with easily computable terms. Then, Padé approximant is applied to the solutions to increase the convergence of given series. It has been attempted to show the reliability and performance of the DTM in comparison with the numerical method (fourth-order Runge–Kutta) in solving this problem. The obtained solutions, in comparison with the numerical solutions admit a remarkable accuracy. 相似文献
9.
An analytical technique based on Gram-Charlier series expansion is presented for the computation of the error probability of equal-gain combiner (EGC) with partially coherent fading signals. Imperfect carrier recovery is attributed to the random noise present in the carrier recovery loops. The resulting noisy phase references are assumed to satisfy Tikhonov distribution. The fades on the diversity branches are assumed to be slowly varying and statistically independent with Rayleigh-distributed envelopes. The error-rate performance of coherent and differentially coherent phase-shift keying (PSK) systems are compared and the phase precision requirement for a reliable coherent detection is computed. Detection loss caused by carrier phase errors is computed for several signal-to-noise ratio (SNR) reliability and bit error probability levels. It is demonstrated that the effect of carrier phase errors on the mean SNR is negligible compared to their effect on deep fades or small bit error probabilities. It is also shown that the carrier phase precision requirement can be reduced through signal combination 相似文献
10.