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Rashid Ali Sindhu,M.K.Park,Saemahn Bhak,Behzad Ahmed Zai,Hassan Mehboob,Joongwon Lee 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Residual stresses deteriorate strength of materials adversely affecting quality of industrial products. A removable or a reduction of the residual stresses is an essential procedure in successful product developments. Effective and convenient methods are necessary for detection and evaluation of the residual stresses. In this investigation Hole Drilling Method is chosen for identification and a quantitative determination of the residual stresses of specimen in two groups under different laser welding speed conditions, 4.1 m/min and 5.1 m/min. Laser lap welding of SPCC sheet joints was investigated along the welding line at two locations, at the welding middle and end locations in the heat affected zone (HAZ). Based on the experimental results and the analysis, higher welding speed condition is predicted to reduce the residual stresses.
An ANN Controlled Three-Phase Auto-Tuned Passive Filter for Harmonic and Reactive Power Compensation
Sindhu M.R,Manjula Nair,T.N.P. Nambiar 전력전자학회 2009 JOURNAL OF POWER ELECTRONICS Vol.9 No.3
Automatically tuned passive filters can improve power quality to a great extent in power systems. A novel three-phase shunt auto-tuned filter is designed to effectively compensate source current harmonics and to provide reactive power required by the non-linear load, which draws a highly reactive, harmonic-rich current from the supply. An artificial neural network (ANN) based controller selects filter component values in accordance with reactive power requirement and harmonic compensation. Traditional passive filters are permanently connected to the system and draw large amounts of source current even under light load conditions. By using auto-tuned filters, the passive filter components can be controlled according to load variations and, hence, draw only required source currents. The selection is done by the ANN with the help of a properly tuned knowledge base to provide instantaneous compensation using a digital controller.
Design and Implementation of Instantaneous Power Estimation Algorithm for Unified Power Conditioner
Sindhu S.,Sindhu M. R.,T. N. P. Nambiar 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.3
This paper discusses a simple control approach for a Unified Power Conditioner (UPC) system to achieve power quality compensation at the point of common coupling in distribution systems. The proposed Instantaneous Power Estimation Algorithm (IPEA) for shunt and series active power filters uses a simple mathematical concept that reduces the complexity in the design of the controller. The performance of a UPC is verified with a system subjected to voltage distortions, sags/swells and unbalanced loads using MATLAB/SIMULINK. The simulation study shows that a UPC with the proposed control algorithm can effectively compensate for voltage and current harmonics, unbalance and reactive power. The control algorithm is experimentally implemented using dSPACE DS1104 and its effectiveness has been verified.
Design and Implementation of Instantaneous Power Estimation Algorithm for Unified Power Conditioner
S., Sindhu,M.R., Sindhu,Nambiar, T.N.P. The Korean Institute of Power Electronics 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.3
This paper discusses a simple control approach for a Unified Power Conditioner (UPC) system to achieve power quality compensation at the point of common coupling in distribution systems. The proposed Instantaneous Power Estimation Algorithm (IPEA) for shunt and series active power filters uses a simple mathematical concept that reduces the complexity in the design of the controller. The performance of a UPC is verified with a system subjected to voltage distortions, sags/swells and unbalanced loads using MATLAB/SIMULINK. The simulation study shows that a UPC with the proposed control algorithm can effectively compensate for voltage and current harmonics, unbalance and reactive power. The control algorithm is experimentally implemented using dSPACE DS1104 and its effectiveness has been verified.
On Cyclic Delay Diversity with Single Carrier OFDM Based Communication Network
A. Sathi Babu,M. Muni Chandrika,P. Sravani,M. Sindhu sowjanyarani,M. Dimpu Krishna International Journal of Computer ScienceNetwork S 2024 International journal of computer science and netw Vol.24 No.2
Cyclic Delay Diversity (CDD) is a diversity scheme used in OFDM-based telecommunication systems, transforming spatial diversity into frequency diversity and thus avoiding intersymbol interference without entailing the receiver to be aware of the transmission strategy making the signal more reliable achieving full diversity gain in cooperative systems. Here the analyzation of the influence of CDD-SC scheme in Cognitive Radio Network (CRN) is done with the challenge of overcoming the complication called channel estimation along with overhead in CNR. More specifically, the closed-form expressions for outage probability and symbol error rate are divided under different frequencies among independent and identically distributed (i.i.d.) frequency selective fading channel model i.e., the signal is divided into different frequencies and transmitted among several narrow band channels of different characteristics. It is useful in the reduction of interference and crosstalk. The results reveal the diversity order of the proposed system to be mainly affected by the number of multipath components that are available in the CNR.
Higher Order Spectra based Features for Infant Cry Signal Classification
( M. Hariharan ),( Yogesh C. K. R. Sindhu ),( Vikneswaran Vijean ),( Haniza Yazid ),( Thiyagar Nadarajaw ),( Kemal Polat ),( Sazali Yaacob ) 한국감성과학회 2017 한국감성과학회 국제학술대회(ICES) Vol.2017 No.-
Crying is an early communication medium for infants. The cry analysis provides an opportunity to assess the physical and pathological status of infants. Several short-term cepstral/spectral features were extracted from the recorded cry signals to detect the reason for crying (hunger, pain, sick condition etc). In this work, Higher order spectra (HOS) based features were proposed to study its efficacy in better representation of cry signals. Statistical features from Bi-spectral plots were derived. Two well-known short-term feature sets known as Mel-frequency cepstral coefficients (MFCCs) and Linear predictive coding based cepstral coefficients (LPCs, Linear predictive cepstral coefficients- LPCCs and weighted LPCCs) were also used. Cry signals from 2 different databases were utilized. Several experiments of twoclass and multi-class classification of cry signals were conducted and the results were reported to demonstrate the effectiveness of the proposed method. The experimental results indicate proposed combination of HOS based features with standard short-term cepstral features help to achieve promosing infant cry classification accuracy.
Behzad Ahmed Zai,M.K. Park,Rashid Ali Sindhu,Joongwon Lee,Hassan Mehboob 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Mass minimization is considered one of the most important factors for design of mechanical structures applied particularly for aerospace structures, which can be obtained through a proper selection of materials and shape optimization. In this paper a numerical method is applied for this purpose and then verified via a finite element method using ANSYS which enables stress constraints to be optimized based on the local Von Mises stresses. A cantilever beam is selected as a mechanical structure for simplicity of its calculation. Structural optimization involves creating geometry which allows parametric study of all design variables and through optimization scheme iteratively selecting the optimum shape. The cross-sections of square and circular were compared together for mass minimization. Estimation of dynamic characteristics of a structure often leads to difference between success and failure due to resonance effect, therefore in order to predict a structural vibration transient and harmonic analyses are performed simultaneously in this paper for the tip displacement and reaction forces in time domain and for the varying excitation frequencies of the applied load. The results found are very useful for many applications particularly where the dynamic loading is invertible.