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Pervasive underwater passive target tracking for the computation of standard deviation solution in a 3D environment

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International Journal of Intelligent Computing and Cybernetics 2021年第4期14卷 580-597页

作者： M.Kavitha Lakshmi s.koteswara rao Kodukula subrahmanyam Computer science and Engineering Koneru Lakshmaiah Education FoundationGunturIndia Electronics and Communications Engineering Koneru Lakshmaiah Education FoundationGunturIndiaand

Purpose-Nowadays advancement in acoustic technology can be explored with marine *** purpose of the paper is pervasive computing underwater target tracking has aroused military and civilian interest as a key component of ocean *** many pervasive techniques are currently found in the literature,there is little published research on the effectiveness of these paradigms in the target tracking ***/methodology/approach-The unscented Kalman filter(UKF)provides good results for bearing and elevation angles only *** methodology and mathematical modeling are carried out and used to analyze the performance of the filter based on the Monte Carlo ***-Due to the intricacy of maritime surroundings,tracking underwater targets using acoustic signals,without knowing the range parameter is *** intention is to find out the solution in terms of standard deviation in a three-dimensional(3D)***/value-A new method is found for the acceptance criteria for range,course,speed and pitch based on the standard deviation for bearing and elevation 3D target tracking using the unscented Kalman filter covariance *** the Monte Carlo simulation,several scenarios are used and the results are shown.

关键词： Unscented Kalman filter Underwater target tracking Acceptance criteria Three-dimensional target tracking standard deviation

Modified Gain Extended Kalman Filter with Application to Angles only Underwater Passive Target Tracking

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Modified Gain Extended Kalman Filter with Application to Ang...

A novel estimation algorithm for torpedo tracking in undersea environment

1998 Fourth International Conference signal Processing

作者： s.koteswara rao scientist’F’ Naval Science and Technological lab

＜正＞Modified Gain Extended Kalman Filter（MGEKF） developed by song and speyer [1]was proven to be suitable algorithm for angles only passive target tracking applications in *** this algorithm is extended with approximately modified gains,which are numerically stable and accurate[3].In this paper,this improved MGEKF algorithm is explored for underwater applications with some *** underwater,the noise in the measurements is very high,turning rate of the platforms is low and speed of the platforms is also low when compared with the missiles in air. These characteristics of the platform are studied in detail and the algorithm is modified suitably for tracking applications in ***-Carlo simulated results for one typical scenario is presented for the purpose of explanation. From the results it is observed that this algorithm is suitable for underwater passive target tracking using angles only measurements.

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Journal of Central south University 2019年第3期26卷 673-683页

作者： D.V.A.N.RAVI KUMAR s.koteswara rao K.PADMA RAJU Department of ECE GVPCEW Department of ECE KLEF Department of ECE JNT University

A novel estimation algorithm is introduced to handle the popular undersea problem called torpedo tracking with angle-only measurements with a better approach compared to the existing filters. The new algorithm produces a better estimate from the outputs produced by the traditional nonlinear approaches with the assistance of simple noise minimizers like maximum likelihood filter or any other algorithm which belongs to their family. The introduced method is extended to the higher version in two ways. The first approach extracts a better estimate and covariance by enhancing the count of the intermediate filters, while the second approach accepts more inputs so as to attain improved performance without enhancement of the intermediate filter count. The ideal choice of the placement of towed array sensors to improve the performance of the proposed method further is suggested as the one where the line of sight and the towed array are perpendicular. The results could get even better by moving the ownship in the direction of reducing range. All the results are verified in the MATLAB environment.

关键词： estimation algorithm torpedo tracking angle-only measurements line of sight maximum likelihood filter

High-Velocity Projectile Impact Behaviour of Friction stir Welded AA7075 Thick Plates

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Defence Technology（防务技术） 2023年第11期29卷 153-163页

作者： R.Praveen s.R.koteswara rao G.selvakumar R.Damodaram Department of Robotics and Automation Karpaga Vinayaga College of Engineering and TechnologyChengalpattu603308TamilNaduIndia Department of Mechanical Engineering Sri Sivasubramaniya Nadar College of EngineeringChennai603110TamilNaduIndia

In this study, high velocity impact behaviour of friction stir welded AA7075-T651 25 mm thick plates were investigated using a 7.62 mm × 51 mm lead core and 7.62 mm × 39 mm steel core projectiles. Prior to ballistic trails, mechanical and metallurgical properties of friction stir welded AA 7075-T651 25 mm thick plates were studied. Microstructural and hardness studies revealed that friction stir welds constituted three distinct regions namely Weld Nugget(WN), Thermo-Mechanically Affected Zone(TMAZ) and Heat Affected Zone(HAZ). Base Material(BM) and all three weld regions were ballistically tested as per military standard NIJ.0108.01 using lead and steel core bullets at maximum permissible velocities of 830 ± 20 and 700 ± 30 m/s, respectively. It has been found that base material(AA7075-T651)and all three weld regions of 25 mm thick plates were able to resist perforation by both types of projectiles used. However depth of penetration has been found to increase from BM to WN, HAZ and TMAZ for both types of projectiles. In all cases steel core projectiles caused higher depth of penetration compared to those caused by lead core projectiles. TMAZs of the friction stir welds were found to be the weakest zone. The fracture that occurred in the base material was spall fragmentation indicating brittle failure, whereas all zones of friction stir welded AA7075-T651 targets with a front petalling, indicating ductile failure. The post-ballistic tested samples showed no significant change in the microstructure of the BM and WN. On the other hand, TMAZ and HAZ showed severe grain deformation in the direction of projectile penetration, and the formation of adiabatic shear bands(AsB). This work showed that 25 mm thick friction stir welded AA7075-T651 joints responded well to ballistic impact loads, making them a good choice for light combat vehicles.

关键词： Aluminum alloy Thick plate Friction stir welding Ballistic performance Depth of penetration

stiffness of a 3-degree of freedom translational parallel kinematic machine

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Frontiers of Mechanical Engineering 2014年第3期9卷 233-241页

作者： s. sHANKAR GANEsH A.B. koteswara rao Department of Mechanical Engineering Gayatri Vidya Parishad College of Engineering Visakhapatnam 530048 India

In this paper, a typical 3-degree of freedom （3- DOF） translational parallel kinematic machine （PKM） is studied and analyzed whose tool platform has only translations along X-, Y- and Z-axes. It consists of three limbs, each of which have arm and forearm with prismatic- revolute-revolute-revolute （PRRR）joints. Inverse kine- matics analysis is carried out to find the slider coordinates and joint angles for a given position of tool platform. stiffness modeling is done based on the compliance matrices of arm and forearm of each limb. Using the stiffness modeling the variations of minimum and max- imum translational stiffness in the workspaee are analyzed. For various architectural parameters of the 3-DOF PKM the tendency of variations on the minimum and maximum stiffness over the entire workspace is studied; and also the deflections of the tool platform along X, Y, and Z directions with respect to various forces are presented.

关键词： 3-DOF translational PKM inverse kine-matics stiffness modeling translational stiffness

Prevalence of shifted Rayleigh filter for passive surveillance in underwater

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International Journal of Intelligent Computing and Cybernetics 2022年第1期15卷 110-123页

作者： Guduru Naga Divya sanagapallea koteswara rao Department of Electronics and Communication Engineering Koneru Lakshmaiah Education FoundationGunturIndia

Purpose-From many decades,bearings-only tracking(BOT)is the interested problem for *** utilises nonlinear filtering methods for state estimation as there is only information about the target,*** is a nonlinear *** measurement bearing is tangentially related to the target state *** are many nonlinear filtering algorithms developed so far in the ***/methodology/approach-In this research work,the recently developed nonlinear filtering algorithm,*** Rayleigh filter(sRF),is applied to ***-The sRF is tested for two-dimensional BOT against various *** simulation results emphasise that the sRF performs well when compared to the standard nonlinear filtering algorithm,unscented Kalman filter(UKF).Originality/value-sRF utilises the nonlinearities present in the bearing measurement through the use of moment *** sRF is able to produce the solution in highly noisy environment,long ranges and high dimension tracking.

关键词： stochastic signal processing shifted Rayleigh filter state estimation Underwater surveillance

Design of Multi-Valued Logic Circuit Using Carbon Nano Tube Field Transistors

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Computers, Materials & Continua 2022年第12期73卷 5283-5298页

作者： s.V.Ratankumar L.koteswara rao M.Kiran Kumar Department of Electronics and Communication Engineering Koneru Lakshmaiah Education FoundationAziz NagarHyderabad500075TelanganaIndia Department of Electronics and Communication Engineering RGM College of Engineering and TechnologyNandyal518501Andhra PradeshIndia Department of Electrical and Electronics Engineering Koneru Lakshmaiah Education FoundationVaddeswaramGuntur522502Andhra PradeshIndia

The design of a three-input logic circuit using carbon nanotube field effect transistors(CNTFETs)is *** logic must be an exact replacement for dual logic since it performs straightforwardly in digital devices,which is why this design is so popular,and it also reduces chip area,both of which are examples of circuit *** proposed module we have investigated is a triple-logic-based one,based on advanced technology CNTFETs and an emphasis on minimizing delay times at various values,as well as comparisons of the design working with various load *** the proposed design with the existing design,the delay times was reduced from 66.32 to 16.41 ps,i.e.,a 75.26%***,the power dissipation was not optimized,and increased by 1.44%compared to the existing *** number of transistors was also reduced,and the product of power and delay(P∗D)achieved a value of 0.0498053 *** improvement at 1 V was also achieved.A load capacitance(fF)was measured at different values,and the average delay measured for different values of capacitance had a maximum of 83.60 ps and a minimum of 22.54 ps,with a range of 61.06 *** power dissipations ranged from a minimum of 3.38μW to a maximum of 6.49μ*** on these results,the use of this CNTFET half-adder design in multiple Boolean circuits will be a useful addition to circuit design.

关键词： Carbon nanotube field effect transistor(CNTFET) multivalued logic(MVL) ternary adder Hewlett simulation program with integrated circuit emphasis(HsPICE) chirality(nm) adder

Error analysis and optimization of a 3-degree of freedom translational Parallel Kinematic Machine

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Frontiers of Mechanical Engineering 2014年第2期9卷 120-129页

作者： s. sHANKAR GANEsH A. B. koteswara rao Department of Mechanical Engineering G.V.E College of Engineering Visakhapatnam 530048 India

In this paper, error modeling and analysis of a typical 3-degree of freedom translational Parallel Kine- matic Machine is presented. This mechanism provides translational motion along the Cartesian X-, Y- and Z- axes. It consists of three limbs each having an arm and forearm with prismatic-revolute-revolute-revolute joints. The moving or tool platform maintains same orientation in the entire workspace due to its joint arrangement. From inverse kinematics, the joint angles for a given position of tool platform necessary for the error modeling and analysis are obtained. Error modeling is done based on the differentiation of the inverse kinematic equations. Variation of pose errors along X, Y and Z directions for a set of dimensions of the parallel kinematic machine is presented. A non-dimensional performance index, namely, global error transformation index is used to study the influence of dimensions and its corresponding global maximum pose error is reported. An attempt is made to find the optimal dimensions of the Parallel Kinematic Machine using Genetic Algorithms in MATLAB. The methodology presented and the results obtained are useful for predicting the performance capability of the Parallel Kinematic Machine under study.

关键词： translational Parallel Kinematic Machine error modeling global error transformation index

Improved sliding-mode control for tracking global maximum power of triple-series-parallel ladder photovoltaic arrays under uneven shadowing

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Clean Energy 2024年第5期8卷 54-72页

作者： Rama koteswara rao Alla Kandipati Rajani Ravindranath Tagore Yadlapalli EEE Department RVR&JC College of EngineeringGunturAndhra Pradesh-522019India EEE Department Vignan’s Lara Institute of Technology&ScienceGunturAndhra Pradesh-522213India

This paper presents an innovative way to enhance the performance of photovoltaic(PV)arrays under uneven shadowing *** study focuses on a triple-series–parallel ladder configuration to exploit the benefits of increased power generation while ad-dressing the challenges associated with uneven *** proposed methodology focuses on the implementation of improved sliding-mode control technique for efficient global maximum power point ***-mode control is known for its robustness in the presence of uncertainties and disturbances,making it suitable for dynamic and complex systems such as PV *** work employs a comprehensive simulation framework to comment on the performance of the suggested improved sliding-mode control strategy in uneven shadowing *** analysis has been done to show the better effectiveness of the suggested method than the traditional control *** results demonstrate a remarkable enhancement in the tracking accuracy of the global maximum power point,leading to enhanced energy-harvesting capabilities under challenging environmental ***,the proposed approach exhibits robustness and adaptability in mitigating the effect of shading on the PV array,thereby increasing overall system *** research contributes valuable insights into the development of advanced control strategies for PV arrays,particularly in the context of triple-series–parallel ladder configurations operating under uneven shadowing *** short narrow shading conditions,the improved sliding-mode control method tracks the maximum power better compared with perturb&observe at 20.68%,incremental-conductance at 68.78%,fuzzy incremental-conductance at 19.8%,and constant-velocity sliding-mode control at 1.25%.The improved sliding-mode control method has 60%less chattering than constant-velocity sliding-mode control under shading conditions.

关键词： improved sliding-mode control PV array global maximum power point series-parallel boost converter