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23,598 Article Results

Robust Multivariable controller Design with the simultaneous H2 /H∞/µ for Single Person Aircraft

https://ijece.iaescore.com/index.php/IJECE/article/view/5485
Javad Mashayekhi Fard , Mohammad Ali Nekoui , Ali Khaki Sedigh , Roya Amjadifard
In a physical system several targets are normally being considered in which each of nominal and robust performance has their own strengths and weaknesses. In nominal performance case, system operation without uncertainty has decisive effect on the operation of system, whereas in robust performance one, operation with uncertainty will be considered. The target of present paper is a balance between nominal and robust performance of state feedback A new approach of present paper is the combination of two controllers of μ and H2/H∞.  The controller for robust stability status, nominal performance, robust performance and noise rejection are designed simultaneous. Controller will be achieved from solving constraint optimization problem. Where a simultaneous H2 /H∞/µ robust multivariable controller has been designed over an X-29 Single Person.  This model has three inputs and three outputs, where the state space equations of the system response to an unstable one. Simulation results show the effectiveness and benefits of the method.DOI:http://dx.doi.org/10.11591/ijece.v3i2.2352
Volume: 3
Issue: 2
Page: 279-286
Publish at: 2013-04-01

A Method of Steganography – P Message With Q Coefficient (SPMQC)

https://ijece.iaescore.com/index.php/IJECE/article/view/5479
Zeinab Famili , Karim Faez , Abbas Fadavi
In this paper, we are going to propose a method for Steganography- which is based on deceiving χ2 algorithm. Since the cover image coefficients and stego image coefficients histograms have significant differences for purposes of statistical properties, statistical analysis of χ2-test reveals the existence of hidden messages inside stego image. We are introducing an idea for hiding messages in the cover image. It causes that DCT (Discrete Cosine Transforms) coefficient histogram not to have remarkable modification before and after embedding message. As a result, identifying the hidden message inside an image is impossible for an eavesdropper through χ2 -test. In this paper, we are proposing a better method with developing this algorithm. In fact, the capacity and the security of embedding messages increase extremely.DOI:http://dx.doi.org/10.11591/ijece.v3i2.2011
Volume: 3
Issue: 2
Page: 230-237
Publish at: 2013-04-01

Demand Analysis of Informational Shipboard Gun Weapon System Interface Design

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2205
WANG Hui-chuan , ZHAO Xiao-zhe
According to development demand of informational shipboard gun weapon system, design concept of shipboard gun weapon system interface is proposed. System composition is put forward and function demand of interface is analyzed from combat, training and detection aspects. General principle need to be followed in design process. A new concept is provided for development of shipboard gun weapon system interface. DOI: http://dx.doi.org/10.11591/telkomnika.v11i4.2395
Volume: 11
Issue: 4
Page: 2131-2135
Publish at: 2013-04-01

A HowNet-Based Semantic Relatedness Kernel for Text Classification

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2171
Pei-Ying Zhang
The exploitation of the semantic relatedness kernel has always been an appealing subject in the context of text retrieval and information management. Typically, in text classification the documents are represented in the vector space using the bag-of-words (BOW) approach. The BOW approach does not take into account the semantic relatedness information. To further improve the text classification performance, this paper presents a new semantic-based kernel of support vector machine algorithm for text classification. This method firstly using CHI method to select document feature vectors, secondly calculates the feature vector weights using TF-IDF method, and utilizes the semantic relatedness kernel which involves the semantic similarity computation and semantic relevance computation to classify the document using support vector machines. Experimental results show that compared with the traditional support vector machine algorithm, the algorithm in the text classification achieves improved classification F1-measure. DOI: http://dx.doi.org/10.11591/telkomnika.v11i4.2361
Volume: 11
Issue: 4
Page: 1909-1915
Publish at: 2013-04-01

Based on the Wavelet Function of Power Network Fault Location

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2173
Fan YU , Shuo ZHANG , BaoLong Liu
In order to improve the measurement accuracy, in the traditional measuring method based on, by avoiding wave speed influence on fault location of transmission line method, and compares it with the combination of wavelet transform. This article selects dBN wavelet and three B spline wavelet contrast, compared them with new methods, through the Xi'an City Power Supply Bureau of the actual fault data validation. The results show that, with3 B spline wavelet and the new method combined with the location results are closer to the actual distance, its accuracy is higher than that of db3wavelet transform and a new method derived from the results, the error is far less than the db3 wavelet function, location is satisfactory. DOI: http://dx.doi.org/10.11591/telkomnika.v11i4.2363
Volume: 11
Issue: 4
Page: 1924-1929
Publish at: 2013-04-01

The Ball Mill Driving Device Fault and the Main Bearing Lubrication Analysis

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2196
Tong Junfeng , Hou Honghai , Zhao Hongxia
This article from the analysis of the power consumption of the ball mill and the work characteristic of the motor, analyzes the fault reason of ball mill transmission equipment. The paper mainly deals with a side-transmission ball mill. The main fault is about the breakdown in the elastic rubber coupling of the transmission system. It is found from the analysis of the real cases and data that the actual power consumption is increased and it is caused by the overload. The main parameters which influence the ball mill power consumption are load of the mill, feed material mass, ball mill rotational speed and friction. The main part of power consumption for ball mill is used to elevating grinding body and material, a portion is used to overcome the friction force between the main bearing. Under the conditions in which the load of the mill and feed material mass are kept the same, the parameters which influence the ball mill power consumption are rotational speed and friction status. When the ball mill voltage decreased, according to the motor characteristics, its rotation speed will decrease, which will disrupt the hydrodynamic lubrication state of the hollow shaft and spherical surface, so that the power consumption of the ball mill increase. The larger power leads to the transmission fault. This paper also put forward to make sure kept the ball mill main bearing lubrication status. DOI: http://dx.doi.org/10.11591/telkomnika.v11i4.2386
Volume: 11
Issue: 4
Page: 2073-2078
Publish at: 2013-04-01

Backstepping decentralized fault tolerant control for reconfigurable modular robots

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2388
Jinbao He , Xinhua Yi , Zaifei Luo , Guojun Li
For the actuators fault of reconfigurable modular robots, a backstepping decentralized fault tolerant control(DFTC) algorithm is proposed. The reconfigurable robot system is diviedinto a set of interconnected subsystems. The fault tolerant controller is designed based on backstepping method.DOI: http://dx.doi.org/10.11591/telkomnika.v11i7.2583
Volume: 11
Issue: 7
Page: 3508-3516
Publish at: 2013-04-01

Turbo Code Design and Implementation of High-Speed Parallel Decoder

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2203
Yi Bo-nian
Due to the high complexity Turbo decoding algorithm, implemented the hardware decoder logic of consumes more resources and storage resources, decode delay larger. In order to meet LTE systems, high reliable transmission of high data rate needs high speed Turbo decoder design faces enormous challenges. This topics select based on LTE system of parallel Turbo Code decoders hardware design and achieved as research direction, select FPGA(Virtex-6) as hardware design and achieved of platform, from Log-MAP algorithm of Sentinel of, and State measure value handed owned calculation in the of owned a of processing, and Diego generation decoding algorithm of parallel of, and parallel interwoven Manager design, and key path optimization technology, aspects analysis, design achieved has LTE Turbo Code high-speed parallel decoders. DOI: http://dx.doi.org/10.11591/telkomnika.v11i4.2393 
Volume: 11
Issue: 4
Page: 2116-2123
Publish at: 2013-04-01

Design and Experiment on Self-propelled Precise Feeding Equipment for Dairy Cow

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2168
Hewei Meng , Zhenjiang Gao , Xiaoling Luo , Za Kan , Hai Lin
Designed a kind of self-propelled precise feeding machine for single dairy cow based on the technology of RFID, to achieve the automation,fine and intelligent of dairy farming.The computer was used as the information management platform, MCU was used as control platform, even using wireless transmission, RFID recognition, infrared detection technology and so on, which achievement the information data of wireless transmission,precise recognition and detection cattle position.It is applied to equal-diameter and variable-pitch screw feeding structure to realize the precise concentrated feed supply, equipment performance test shown that the system speed 60rpm is the most stable when feeding, feeding accuracy not less than 97.5%, to meet the feeding requirements, equipped with the best traveling speed is 0.6m/s, the response time of the system is 0.4s, the recognition rate is 96%; through one-month feeding experiment in the dairy cow farm showed that the milk production was increased, the average daily milk yield of individual cows improve 0.8kg than artificial feeding. DOI: http://dx.doi.org/10.11591/telkomnika.v11i4.2357
Volume: 11
Issue: 4
Page: 1889-1895
Publish at: 2013-04-01

Genetic Algorithm and Its Application in Scheduling System

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2175
Jian Ni , Ning-Ning Yang
With the development of education and college expansion and consolidation in the Educational Management System Course Scheduling System has become more complex, and therefore necessary to design one for development, and reuse. Given this situation, this paper proposes a solution based on genetic algorithm. The results show that genetic algorithms can effectively solve the course timetabling problem. This method is easy to learn and apply, and do not rely on a special mode. DOI: http://dx.doi.org/10.11591/telkomnika.v11i4.2365
Volume: 11
Issue: 4
Page: 1934-1939
Publish at: 2013-04-01

Design and Realization of Teaching Demonstration System Based on .Net

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2191
Ailian Wang , Jinfei Ma , Yueming Qin
In order to realize the systematic planning for teaching demonstration, this article proposed a teaching demonstration system based on .Net. The system adopted the techniques of Windows forms and serialization, Windows tree controls and the type and level of algorithm, component interface, advanced realization of windows graphics device interface, graphics drawing application programming interface, object link embedded, platform/assembly technology based on SOA, and was applied successfully in the development of the project, providing an effective method for informatization teaching. DOI: http://dx.doi.org/10.11591/telkomnika.v11i4.2381
Volume: 11
Issue: 4
Page: 2037-2041
Publish at: 2013-04-01

Experiment System of Motorcycle Impact Injury Using Electric Motor Traction

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2223
Haibin CHEN , Jianjin HANG , Liying ZHANG , Xin NING , Xiaoyan LI , Zhiyong YIN , Guangyu YANG , Zhengguo WANG
A unique motor drive unit (MDU) and motorcycle crash simulation unit (MCSU) were developed to establish a short-track and high-accuracy experiment system of motorcycle impact injury. The control hardware of the MDU consists of a “two DC motors” system and a “two drums, closed-loop, friction transmission” system, and the control software of the MDU has a novel “carriage acceleration profile control program” which was specially set up to prevent the cusp-like pulse and oscillation phenomenon in the acceleration stage close to the uniform velocity. The unique motorcycle sled and energy absorber constitute a novel MCSU. Research results show that: (1)Using a unique generation algorithm of the carriage acceleration- and velocity-time curve and unique manufacturing techniques of hardware components, the apparatus presented in this paper has a potential to become the first short-track experiment system of motorcycle impact injury. (2)Due to a high weight capacity with the ability to propel whole vehicles, the MDU can be used in the full motorcycle/full vehicle crash tests or vehicle component sled impact tests. DOI: http://dx.doi.org/10.11591/telkomnika.v11i4.2429
Volume: 11
Issue: 4
Page: 2253-2263
Publish at: 2013-04-01

A New Approach of Error Compensation on NC Machining Based on Memetic Computation

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2208
Huanglin Zeng , Yong Sun , Xiaohui Zeng
This paper is a study of the application of Memetic computation integrating and coordinating intelligence algorithms to solve the problems of error compensation for a high-precision numeral control machining system. The primary focus is on development of integrated intelligent computation approach to set up an error compensation system of a numeral control machine tool based on a dynamic feedback neural network. Optimization of error measurement points of a numeral control machine tool is realized by way of application of error variable attribute reduction on rough set theory. A principal component analysis is used for data compression and feature extraction to reduce the input dimension of a dynamic feedback neural network. A dynamic feedback neural network is trained on ant colony algorithm so that network can converge to get a global optimum. Positioning error caused in thermal deformation compensation capabilities were tested using industry standard equipment and procedures. The results obtained shows that this approach can effectively improve compensation precision and real time of error compensation on machine tools. DOI: http://dx.doi.org/10.11591/telkomnika.v11i4.2399
Volume: 11
Issue: 4
Page: 2148-2156
Publish at: 2013-04-01

An Improved Solution for the Fast-Locking All Digital SAR DLL

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/2162
Shibin Lu , Tailong Xu , Junning Chen
All digital successive approximation register-controlled delay-lock loops (SAR DLL) are widely used in system-on-chip to solve the clock generation and skew problems for their fast-locking characteristic. However, the conventional SAR DLL has the dead lock problem. So many improved solutions are proposed to solve the dead lock problem. Based on the resettable delay line, improved SAR controller and phase comparator are depicted. By these, a harmonic-free and fast-locking all digital SAR DLL without dead lock is implemented. Post-layout transistor-level simulation results show that the lock-in and relock-in time are both within N cycles of input clock for N-bit SAR controller. The dead lock problem of the conventional SAR DLL is eliminated very well. DOI: http://dx.doi.org/10.11591/telkomnika.v11i4.2341
Volume: 11
Issue: 4
Page: 1849-1856
Publish at: 2013-04-01

Power Flow Study and Performance of STATCOM and TCSC in Improvement Voltage Stability and Loadability Amplification in Power System

10.11591/ijape.v2.i1.pp15-26
Haniyeh Marefatjou , Mohammad Sarvi
Power systems operation becomes more important as the load demand increases all over the world. This rapid increase in load demand forces power systems to operate near critical limits due to economical and environmental constraints. The objective in power systems operation is to serve energy with acceptable voltage and frequency to consumers at minimum cost. This paper studies the important power system phenomenon and voltage stability by using continuation power flow method and steady-state modeling of Static Synchronous Compensator (STATCOM) and Thyristor Controlled Series Capacitor (TCSC) for continuation power flow studies has been represented and discussed in details.also this paper studies voltage stability by using continuation power flow method and Comparison between performance of TCSC and STATCOM for improve voltage stability has been done. Case studies are carried on 9 bus network. Simulation is done with PSAT in MATLAB. Power Flow and  Continuation Power Flow is was implemented using Newton-Raphson method. Simulation results show the proper performance of TCSC and STATCOM to improve voltage control and power flows on the lines and significantly increase the loadability margin of power systems.
Volume: 2
Issue: 1
Page: 15-26
Publish at: 2013-04-01
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