Prevalence of shifted Rayleigh filter for passive surveillance in underwater

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Guduru Naga Divya ◽  
Sanagapallea Koteswara Rao
Keyword(s):  
Nonlinear Filtering ◽  
Design Methodology ◽  
Unscented Kalman Filter ◽  
Research Work ◽  
Moment Matching ◽  
Passive Surveillance ◽  
Noisy Environment ◽  
Content Type ◽  
Filtering Algorithm ◽  
Simulation Results

PurposeFrom many decades, bearings-only tracking (BOT) is the interested problem for researchers. This utilises nonlinear filtering methods for state estimation as there is only information about the target, i.e. bearing is a nonlinear measurement. The measurement bearing is tangentially related to the target state vector. There are many nonlinear filtering algorithms developed so far in the literature.Design/methodology/approachIn this research work, the recently developed nonlinear filtering algorithm, i.e. shifted Rayleigh filter (SRF), is applied to BOT.FindingsThe SRF is tested for two-dimensional BOT against various scenarios. The simulation results emphasise that the SRF performs well when compared to the standard nonlinear filtering algorithm, unscented Kalman filter (UKF).Originality/valueSRF utilises the nonlinearities present in the bearing measurement through the use of moment matching. The SRF is able to produce the solution in highly noisy environment, long ranges and high dimension tracking.

Autopilot design for an aircraft by using Luenberger observer design

2018 ◽  
Vol 90 (5) ◽  
pp. 858-868 ◽  
Author(s):  
Muhammad Taimoor ◽  
Li Aijun ◽  
Rooh ul Amin ◽  
Hongshi Lu
Keyword(s):  
Design Methodology ◽  
Research Work ◽  
Linear Quadratic Regulator ◽  
Observer Design ◽  
Linear Quadratic ◽  
Content Type ◽  
Luenberger Observer ◽  
Level Flight ◽  
Aerial Vehicle ◽  
The Cost

Purpose The purpose of this paper is to design linear quadratic regulator (LQR) based Luenberger observer for the estimation of unknown states of aircraft. Design/methodology/approach In this paper, the LQR-based Luenberger observer is deliberated for autonomous level flight of unmanned aerial vehicle (UAV) which has been attained productively. Various modes like phugoid and roll modes are exploited for controlling the rates of UAV. The Luenberger observer is exploited for estimation of the mysterious states of the system. The rates of roll, yaw and pitch are used as an input to the observer, while the remaining states such as velocities and angles have been anticipated. The main advantage of using Luenberger observer was to reduce the cost of the system which has been achieved lucratively. The Luenberger observer proposes sturdiness at the rate of completion to conquest over the turmoil and insecurities to overcome the privileged recital. The FlightGear simulator is exploited for the endorsement of the recital of the Luenberger observer-based autopilot. The level flight has been subjugated lucratively and has been legitimated by exploiting the FlightGear simulator. The authenticated and the validated results are offered in this paper. Microsoft Visual Studio has been engaged as a medium between the MATLAB and FlightGear Simulator. Findings The suggested observer based on LQR ensures the lucrative approximation of the unknown states of the system as well as the successful level flight of the system. The Luenberger observer is used for approximation of states while LQR is used as controller. Originality/value In this research work, not only the estimation of unknown states of both longitudinal and lateral model is made but also the level flight is achieved by using those estimated states and the autopilot is validated by using the FlightGear, while in most of the research work only the estimation is made of only longitudinal or lateral model.

Unfair dismissal in the Mauritius context: a comparative study

2018 ◽  
Vol 60 (6) ◽  
pp. 1299-1312
Author(s):  
Ambareen Beebeejaun
Keyword(s):  
Design Methodology ◽  
Research Work ◽  
Procedural Fairness ◽  
Content Type ◽  
Monetary Compensation ◽  
Unfair Dismissal ◽  
The Subject ◽  
The Law ◽  
Employment Rights ◽  
Practical Recommendations

Purpose The purpose of this study is to critically analyse the concept of unfair dismissal and to assess the extent to which the Employment Rights Act 2008 is affording protection to employees in Mauritius. The purpose of this study is to also demonstrate that as employees form an integral part of their workplace, their employment cannot be terminated without substantive and procedural fairness. The paper will provide some recommendations to cater for loopholes in existing Mauritius employment legislations. Design/Methodology/Approach To critically examine the topic, the black letter approach is adopted to detail legislations and judgments of courts on the subject matter. A comparative analysis with some other jurisdictions’ employment legislations is also carried out to define, explain and examine the concepts of dismissal, substantive causes such as misconduct and procedural fairness. Findings From the methodologies used, it is found that a substantial reason is not sufficient to conclude whether a dismissal is fair. The law of unfair dismissal has introduced some procedural safeguards to protect the employee from being unfairly and unjustifiably dismissed. The procedural requirements act as guidelines to employers and if they are not followed properly, the dismissal will be unfair. Unfair dismissal needs to be accompanied by remedies from employers, and monetary compensation has been found to be the most appropriate remedy. Originality/Value This paper is amongst the first research work conducted in Mauritius that compares the law of unfair dismissal and its implications with the laws of England and South Africa. The study is carried out with a view to provide practical recommendations in this area of employment law to the relevant stakeholders concerned.

Design and optimization of heating, cooling and lightening systems for a residential villa at Saman city, Iran

2019 ◽  
Vol 17 (1) ◽  
pp. 41-52 ◽  
Author(s):  
Javad Riahi Zaniani ◽  
Shahab Taghipour Ghahfarokhi ◽  
Mehdi Jahangiri ◽  
Akbar Alidadi Shamsabadi
Keyword(s):  
Energy Consumption ◽  
Light Intensity ◽  
Design Methodology ◽  
Climatic Conditions ◽  
Content Type ◽  
Design And Optimization ◽  
Simulation Results ◽  
Annual Reduction ◽  
Reduction Of Energy Consumption ◽  
Heating Loads

Purpose This paper, using energy softwares, designed of Iran and optimized a residential villa in Saman city located in Chaharmahal and Bakhtiari Province. Design/methodology/approach Having used the ideas of Climate Consultant software, the basic designing was conducted by Design Builder Software, and the cooling and heating loads and lighting tools and equipment were calculated. Then, the amount of consuming of heating, cooling and lighting load of the building was optimized through insulation of walls and ceiling, using green roof, double glazing UPVC windows, light intensity sensor and variable refrigerant flow (VRF) system. Findings Simulation results for the stated scenarios showed an annual reduction in energy consumption of 21.1, 7.9, 26.41, 27.3 and 72.3 per cent, respectively. Also, by combining all the five scenarios, an optimal state was achieved which, from the results, brought about an annual reduction of 86.9 per cent in the energy consumption. Originality/value The authors hope that the results of the current paper could be helpful for designers and engineers in reduction of energy consumption for designing a building in similar climatic conditions.

The influence of legal framework on the Hellenic sector of public works

2018 ◽  
Vol 60 (5) ◽  
pp. 1196-1209
Author(s):  
Pavlos Metallinos
Keyword(s):  
Design Methodology ◽  
Research Work ◽  
Legal Framework ◽  
Public Works ◽  
Content Type ◽  
Legislative Framework ◽  
Annual Volume ◽  
Statistical Indicators ◽  
Total Circulation

Purpose This study aims to discover the motive for the time-to-time Hellenic collective capitalists’ intervention in the total circulation of capital of public works throughout the relative legislative framework. Thus the study attempts an original correlation of statistical indicators of Hellenic Statistical Authority with the legislative texts. Design/methodology/approach The Hellenic truth is that the branch of public works presents a peculiarity as far as the volume and quality of statistical facts and figures are concerned. To overcome this obstacle, this study analyzed the change of time series, relating the procedure of total circulation of contracting capital involved in public works with the content of the relative legislative rules which were applied during the period of 1958-2004 and their preambles. In this way, the annual volume of the constructional product in general is directly related with the particular characteristics that define the procedure of total circulation of the contracting capital in general. Findings The directly relation between the annual volume of the constructional Product in general and the particular characteristics that define the procedure of total circulation of the contracting capital in general, leads us to conclusions which, related with the policy and practices adopted by the collective capitalist, confirm or even set off eventual failures of respective conclusions drawn according to the prevailing concept. Originality/value By introducing the technique, the aim of this research work is achieved without reproducing the method of study and the conclusions of other researchers.

Design and vibration analysis of a self-adaptive piston in a novel nanoimprint system

2017 ◽  
Vol 69 (4) ◽  
pp. 591-597
Author(s):  
Chaoran Liu ◽  
Yufeng Su ◽  
Jinzhao Yue ◽  
Junjie Wang ◽  
Weiwei Xia ◽  
...  
Keyword(s):  
Nanoimprint Lithography ◽  
Vibration Analysis ◽  
Design Methodology ◽  
The Self ◽  
Ball Screw ◽  
Piston Rings ◽  
Content Type ◽  
Simulation Results ◽  
The One ◽  
Self Adaptive

Purpose A self-adaptive piston is designed for the compressional gas cushion press nanoimprint lithography system. It avoids the lube pollution and high wear of traditional piston. Design/methodology/approach The self-adaptive piston device consists of symmetrical piston bodies, piston rings and other parts. The two piston bodies are linked by a ball-screw. The locking nut adjusts the distance between two piston bodies to avoid the piston rings from being stuck. The piston rings are placed between two piston bodies. Findings The simulation results based on COMSOL indicate that cylinder vibration caused by self-adaptive piston is 15.9 times smaller than the one caused by a traditional piston. Originality/value The self-adaptive piston is superior to the traditional piston in decreasing cylinder vibration.

An improved circuit for modulator based on nanostructured memristor

Circuit World ◽  
2016 ◽  
Vol 42 (4) ◽  
pp. 178-182 ◽  
Author(s):  
Shao-Fu Wang ◽  
D.Z. Xu
Keyword(s):  
Amplitude Modulation ◽  
Design Methodology ◽  
Content Type ◽  
Amplitude Modulator ◽  
Simulation Results

Purpose This paper aims to propose the modeling of nanostructured memristor, and the circuit of amplitude modulator was designed and analyzed with memristor. The simulation results show that the nanostructured memristor can be utilized to implement the desired amplitude modulated signal. Design/methodology/approach The modeling of nanostructured memristor is proposed in this paper, and the circuit of amplitude modulator was designed and analyzed with memristor, amplifiers and BPF device. For measuring the modulated signal, the emulator circuit of memristor is designed. The simulation results show that the nanostructured memristor can be utilized to implement the desired amplitude modulated signal. Findings The innovations of this work are as follows: the AM modulator circuit using memristor has been proposed, analyzed and simulated. The emulator of memristor is given. Originality/value The innovations of this work are as follows: the AM modulator circuit using memristor has been proposed, analyzed and simulated. The emulator of memristor is given, and the results of this work demonstrate that the nonlinearity of the memristor can be used to generate the desired amplitude modulation free of harmonic sidebands, because of distortion of the modulating signal.

Understanding the motives of consumers of mezcal in Mexico

2018 ◽  
Vol 120 (7) ◽  
pp. 1643-1656 ◽  
Author(s):  
Carolina Andrea López-Rosas ◽  
Angélica Espinoza-Ortega
Keyword(s):  
Social Networking ◽  
Professional Education ◽  
Food Choice ◽  
Design Methodology ◽  
Research Work ◽  
Quality Criteria ◽  
Demographic Characteristics ◽  
Content Type ◽  
Factor And Cluster Analysis ◽  
And Cluster Analysis

Purpose The purpose of this paper is to characterize the consumers of mezcal in México based on their motivations, identifying different groups of consumers and their demographic characteristics. Design/methodology/approach A questionnaire based on the Food Choice Questionnaire was applied to 310 consumers: 154 directly to mezcal consumers in three “mezcalerías” (mezcal bars) and 156 through five social networking communities of mezcal consumers. The data obtained were analysed using multivariate statistics, factor and cluster analysis. Findings The results show that the search for tradition is the determining buying motivation, whereas quality seals do not exert a significant influence. Four profiles of mezcal consumers can be identified according to their consumption patterns: consumer linked to the territory, traditional consumer, consumer in transition and social consumer. The predominant demographic characteristics in the four consumer groups described a male, between 20 and 39 years old, single, childless, with professional education and employed. The overall results reveal a consumer who shares the quality criteria established by mescal-producing communities and is strongly interested in traditionally processed drinks. Originality/value In México, there are two important distilled drinks, tequila and mezcal. There is ample research on the first one, but there is less research on mezcal, despite it has an annual increase of 45 per cent in consumption. Most of the research work has been focused on aspects of diversity, sustainability and productivity, but there are not studies on the factors that affect mezcal consumption. Thus, this paper aims to characterize the consumers of mezcal, based on their motivations.

Induction motors broken rotor bars detection using RPVM and neural network

2019 ◽  
Vol 38 (2) ◽  
pp. 596-615 ◽  
Author(s):  
Saddam Bensaoucha ◽  
Sid Ahmed Bessedik ◽  
Aissa Ameur ◽  
Ali Teta
Keyword(s):  
Design Methodology ◽  
Induction Motors ◽  
Content Type ◽  
Broken Rotor Bars ◽  
Squirrel Cage ◽  
Detection And Identification ◽  
Squirrel Cage Induction Motor ◽  
Simulation Results ◽  
Cage Induction Motor ◽  
Diagnosis Technique

Purpose The purpose of this study aims to focus on the detection and identification of the broken rotor bars (BRBs) of a squirrel cage induction motor (SCIM). The presented diagnosis technique is based on artificial neural networks (NNs) that use as inputs the results of the spectral analysis using the fast Fourier transform (FFT) of the reduced Park’s vector modulus (RPVM), along with the load values in which the motor operates. Design/methodology/approach First, this paper presents a comparative study between FFT applied on Hilbert modulus, Park’s vector modulus and RPVM to extract feature frequencies of BRB faults. Moreover, the extracted features of FFT applied to RPVM and the load values were selected as NNs’ inputs for the detection of the number of BRBs. Findings The obtained simulation results using MATLAB (Matrix Laboratory) environment show the effectiveness and accuracy of the proposed NNs based approach. Originality/value The current paper presents a novel diagnostic method for BRBs’ fault detection in SCIM, based on the combination between the signal processing analysis (FFT of RPVM) and artificial intelligence (NNs).

Predicting formulae for effective length of counterpoise wires buried in ionized, dispersive and inhomogeneous soils

2020 ◽  
Vol 39 (6) ◽  
pp. 1375-1391
Author(s):  
Seyyed Sajjad Sajjadi ◽  
Saeed Reza Ostadzadeh
Keyword(s):  
Sensitivity Analysis ◽  
Transmission Line ◽  
Design Methodology ◽  
Effective Length ◽  
Transmission Line Model ◽  
Line Model ◽  
Content Type ◽  
Dispersion Effects ◽  
Simulation Results

Purpose The purpose of this paper is to investigate the ionization and dispersion effects in combination with the inhomogeneity of soil simultaneously on the effective lengths of counterpoise wires. Design/methodology/approach Improved multi-conductor transmission line model is used for computing effective length of counterpoise wires considering all aspects of soils. Findings The simulation results show that the ionization and dispersion effects simultaneously results in placing the effective length between situations where only one effect is considered. Also, predicting formulae for effective length of counterpoise wires considering all effects are proposed. Originality/value A sensitivity analysis on the effective lengths of counterpoise wires considering all aspects of soils is carried out.

A family-enterprise collective certification trademark: consumer insight

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Anna Maria Nikodemska-Wolowik ◽  
Piotr Zientara ◽  
Anna Zamojska
Keyword(s):  
Family Business ◽  
Design Methodology ◽  
Family Firms ◽  
Research Work ◽  
Strong Relationship ◽  
Content Type ◽  
Family Enterprise ◽  
Negative Perceptions ◽  
Consumer Insight ◽  
Practical Implications

PurposeThe purpose of this study is to find out how consumers respond to a proposed family-enterprise collective certification trademark and how they perceive family firms in general.Design/methodology/approachThe paper employs a quantitative approach. It draws on a questionnaire survey conducted among 1,091 Polish consumers in January 2018. Statistical methods, such as exploratory factor analysis, were applied.FindingsPolish consumers responded positively to the proposed trademark. It also turned out that those who pay attention to the producer or the brand owner in a given sector also pay attention to the symbols placed on products or services from these sectors. There was a strong relationship between consumers' positive perceptions of family firms and their assessments of the proposed trademark. This did not extend to negative perceptions. The findings from this study may be generalisable to other post-communist societies.Practical implicationsFamily firms should redouble their efforts to introduce a family-enterprise collective certification trademark (not only in Poland, but also in those countries where such a trademark is non-existent). This should be handled by umbrella bodies for family business.Originality/valueLittle research work, based on a large and representative sample, has so far focussed on the issue of how consumers respond to a family-enterprise identity. The value of this study lies in deepening understanding of the processes and mechanisms that underlie the organisation–consumer relationship within the context of family-enterprise operation.

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