Simulation studies of a vision intruder detection system

2020 ◽  
Vol 92 (4) ◽  
pp. 621-631 ◽  
Author(s):  
Paweł Rzucidło ◽  
Tomasz Rogalski ◽  
Grzegorz Jaromi ◽  
Damian Kordos ◽  
Piotr Szczerba ◽  
...  
Keyword(s):  
Detection System ◽  
Theoretical Data ◽  
Global Scale ◽  
Unmanned Aircraft ◽  
Flight Simulator ◽  
Simulation Studies ◽  
Simulation Environment ◽  
Collision System ◽  
Content Type ◽  
Angle Of View

Purpose The purpose of this paper is to describe simulation research carried out for the needs of multi-sensor anti-collision system for light aircraft and unmanned aerial vehicles. Design/methodology/approach This paper presents an analysis related to the practical possibilities of detecting intruders in the air space with the use of optoelectronic sensors. The theoretical part determines the influence of the angle of view, distance from the intruder and the resolution of the camera on the ability to detect objects with different linear dimensions. It has been assumed that the detection will be effective for objects represented by at least four pixels (arranged in a line) on the sensor matrix. In the main part devoted to simulation studies, the theoretical data was compared to the obtained intruders’ images. The verified simulation environment was then applied to the image processing algorithms developed for the anti-collision system. Findings A simulation environment was obtained enabling reliable tests of the anti-collision system using optoelectronic sensors. Practical implications The integration of unmanned aircraft operations in civil airspace is a serious problem on a global scale. Equipping aircraft with autonomous anti-collision systems can help solve key problems. The use of simulation techniques in the process of testing anti-collision systems allows the implementation of test scenarios that may be burdened with too much risk in real flights. Social implications This paper aims for possible improvement of safety in light-sport aviation. Originality/value This paper conducts verification of classic flight simulator software suitability for carrying out anti-collision systems tests and development of a flight simulator platform dedicated to such tests.

Isolating observer for simultaneous structural-actuator fault detection

2018 ◽  
Vol 6 (3) ◽  
pp. 118-133
Author(s):  
Hamed Pourazad ◽  
Javad Askari ◽  
Saeed Hosseinnia
Keyword(s):  
Fault Detection ◽  
Detection System ◽  
Design Procedure ◽  
Fault Isolation ◽  
Unmanned Aircraft ◽  
Fault Detection And Isolation ◽  
Simultaneous Occurrence ◽  
Detection Scheme ◽  
Content Type ◽  
Commercial Applications

Purpose Increasing commercial applications for small unmanned aircraft create growing challenges in providing safe flight conditions. The conventional measures to detect icing are either expensive, energy consuming or heavy. The purpose of this paper is to develop a fault identification and isolation scheme using unknown input observers to detect and isolate actuator and structural faults in simultaneous occurrence. Design/methodology/approach The fault detection scheme is based on a deviation in system parameters due to icing and lock-in-place (LIP), two faults from different categories with similar indications that require different reconfiguration actions. The obtained residual signals are selected to be triggered by desired faults, while insensitive to others. Findings The proposed observer is sensitive to both actuator and structural faults, and distinguishes simultaneous occurrences by insensitivity to LIP in selected residue signals. Simulation results confirm the success of the proposed system in the presence of uncertainty and disturbance. Research limitations/implications The fault detection and isolation scheme proposed here is based on the linear model of a winged aircraft, the Aerosonde. Moreover, the faults are applied to rudder and aileron in simulations, but the design procedure for other models is provided. The designed scheme could be further implemented on a non-linear aircraft model. Practical implications Applying the proposed icing detection scheme increases detection system reliability, since fault isolation enables timely reconfiguration schemes. Originality/value The observers proposed in previous papers detected icing fault but were not insensitive to actuator faults.

scholarly journals Laser spectroscopy of the $$^2{\mathrm{S}}_{1/2}{-}^2{\mathrm{P}}_{{1}/2}$$, $$^2{\mathrm{P}}_{3/2}$$ transitions in stored and cooled relativistic C$$^{3+}$$ ions

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
D. Winzen ◽  
V. Hannen ◽  
M. Bussmann ◽  
A. Buß ◽  
C. Egelkamp ◽  
...  
Keyword(s):  
Laser Spectroscopy ◽  
Continuous Wave ◽  
Detection System ◽  
Laser System ◽  
Theoretical Data ◽  
Plasma Spectroscopy ◽  
Carbon Ions ◽  
Uv Laser ◽  
Spectroscopy Experiment ◽  
Extreme Uv

AbstractThe $$^2{\mathrm{S}}_{1/2}{-}^2{\mathrm{P}}_{{1}/2}$$ 2 S 1 / 2 - 2 P 1 / 2 and $$^2{\mathrm{S}}_{1/2}{-}^2{\mathrm{P}}_{{3}/2}$$ 2 S 1 / 2 - 2 P 3 / 2 transitions in Li-like carbon ions stored and cooled at a velocity of $$\beta \approx 0.47$$ β ≈ 0.47 in the experimental storage ring (ESR) at the GSI Helmholtz Centre in Darmstadt have been investigated in a laser spectroscopy experiment. Resonance wavelengths were obtained using a new continuous-wave UV laser system and a novel extreme UV (XUV) detection system to detect forward emitted fluorescence photons. The results obtained for the two transitions are compared to existing experimental and theoretical data. A discrepancy found in an earlier laser spectroscopy measurement at the ESR with results from plasma spectroscopy and interferometry has been resolved and agreement between experiment and theory is confirmed.

Regional super power grids face political obstacles

2021 ◽  
Keyword(s):  
Electricity Generation ◽  
Fossil Fuels ◽  
Peak Load ◽  
Global Scale ◽  
Power Grids ◽  
Submarine Cable ◽  
Content Type ◽  
Cable Industry ◽  
Global Power ◽  
Load Generation

Significance Its proponents argue that interconnecting the world’s power grids would make it easier for renewable energy, however remotely it is generated, to replace most fossil fuels in electricity generation. Implementation remains a distant, and politically fraught, possibility but regional super-grids look increasingly feasible and could boost the submarine cable industry. Impacts Load-balancing on a global scale could reduce peak load generation needs by an estimated 5-10%, saving billions in investment. Power grids require estimated investment of USD14tn by 2050, nearly as much as projected spending on new renewables capacity. International rules on carbon pricing and taxing would be a prerequisite for a global power grid.

Towards a general model explaining physical and digital counterfeits

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Francisco-Jose Molina-Castillo ◽  
Elfriede Penz ◽  
Barbara Stöttinger
Keyword(s):  
General Model ◽  
Purchase Intention ◽  
Global Scale ◽  
Future Research ◽  
Digital Piracy ◽  
Digital Products ◽  
Content Type ◽  
Self Identity ◽  
Robust Model ◽  
Research Goal

PurposeDemand for fake physical and digital products is a global phenomenon with substantive detrimental effects on companies and consumers. This raises various questions and issues, such as whether there are generalizable explanations of purchase intentions.Design/methodology/approachThis research is based on consumer samples from three different countries. This paper develops and tests a model based on the theory of planned behavior (TPB) to explain both the demand for counterfeits and digital piracy. Respondents were questioned about physical products (e.g. clothing, accessories) from well-known brands and digital products (e.g. software, music).FindingsSocially oriented motives such as embarrassment potential, ethical concerns and social norms explain the intention to purchase fake physical and digital products, while personally oriented motives (e.g. self-identity) have indirect effects but not a direct impact on purchase intention.Research limitations/implicationsAs our results show, we find evidence for a general model – contributing and supporting our first and primary research goal of providing a theoretically robust model that bridges the gap between two streams of literature.Practical implicationsThe fact that drivers of buying counterfeit physical and digital goods are similar across countries provides justification for companies and international organizations to bundle their efforts and thus leverage them more strongly on a global scale.Originality/valueWe provide a basis for consolidating future research on demand for counterfeits and pirated goods because underlying factors driving demand are similar across the three countries studied herein.

Real-time trajectory tracking control of Stewart platform using fractional order fuzzy PID controller optimized by particle swarm algorithm

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Zafer Bingul ◽  
Oguzhan Karahan
Keyword(s):  
Dynamic Model ◽  
Fractional Order ◽  
Trajectory Tracking ◽  
Tracking Control ◽  
Fuzzy Pid ◽  
Simulation Environment ◽  
Trajectory Tracking Control ◽  
Content Type ◽  
Control Approach ◽  
Coupling Dynamic

Purpose The purpose of this paper is to address a fractional order fuzzy PID (FOFPID) control approach for solving the problem of enhancing high precision tracking performance and robustness against to different reference trajectories of a 6-DOF Stewart Platform (SP) in joint space. Design/methodology/approach For the optimal design of the proposed control approach, tuning of the controller parameters including membership functions and input-output scaling factors along with the fractional order rate of error and fractional order integral of control signal is tuned with off-line by using particle swarm optimization (PSO) algorithm. For achieving this off-line optimization in the simulation environment, very accurate dynamic model of SP which has more complicated dynamical characteristics is required. Therefore, the coupling dynamic model of multi-rigid-body system is developed by Lagrange-Euler approach. For completeness, the mathematical model of the actuators is established and integrated with the dynamic model of SP mechanical system to state electromechanical coupling dynamic model. To study the validness of the proposed FOFPID controller, using this accurate dynamic model of the SP, other published control approaches such as the PID control, FOPID control and fuzzy PID control are also optimized with PSO in simulation environment. To compare trajectory tracking performance and effectiveness of the tuned controllers, the real time validation trajectory tracking experiments are conducted using the experimental setup of the SP by applying the optimum parameters of the controllers. The credibility of the results obtained with the controllers tuned in simulation environment is examined using statistical analysis. Findings The experimental results clearly demonstrate that the proposed optimal FOFPID controller can improve the control performance and reduce reference trajectory tracking errors of the SP. Also, the proposed PSO optimized FOFPID control strategy outperforms other control schemes in terms of the different difficulty levels of the given trajectories. Originality/value To the best of the authors’ knowledge, such a motion controller incorporating the fractional order approach to the fuzzy is first time applied in trajectory tracking control of SP.

Cantilever enhanced based photoacoustic detection of SF6 decomposition component SO2 using UV LED

Sensor Review ◽  
2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Tunan Chen ◽  
Fengxiang Ma ◽  
Yue Zhao ◽  
Zhenghai Liao ◽  
Zongjia Qiu ◽  
...  
Keyword(s):  
Detection Limit ◽  
Detection System ◽  
Light Sources ◽  
Photoacoustic Detection ◽  
Low Light ◽  
Power Requirement ◽  
Light Power ◽  
Content Type ◽  
Uv Led ◽  
Sf6 Decomposition

Purpose This paper aims to establish a photoacoustic detection system for SO2 using UV-LED and testify its feasibility for sensitive measurement. The work in this paper can avoid potential crossover interference in infrared (IR) range and also balance the capability and cost of feasible excitation for photoacoustic detection system. Design/methodology/approach In this experimental work, a cantilever-enhanced–based photoacoustic SO2 detection system using an ultraviolet (UV) LED light source with a light power of 4 mW as the excitation was established. Findings A feasible photoacoustic detection system for SO2 using UV-LED was established. Experimental results demonstrate that the detection limit of the system can reach the level of 0.667 ppm, which can serve as a reference for the application of PAS in insulation fault diagnosis. Originality/value This work investigated the potential of using ultraviolet photoacoustic spectroscopy to detect trace SO2, which provided an ideal replacement of infrared-laser-based detection system. In this paper, a photoacoustic detection system using LED with a low light power was established. Low light power requirement can expand the options of light sources accordingly. In this paper, the absorption characteristics of SO2 in the presented detection system and ultraviolet range were studied. And the detection limit of the presented system was given. Both of which can provide reference to SO2 detection in ambient SF6.

Aerodynamic and structural design for the development of a MALE UAV

2018 ◽  
Vol 90 (7) ◽  
pp. 1077-1087 ◽  
Author(s):  
Pericles Panagiotou ◽  
Efstratios Giannakis ◽  
Georgios Savaidis ◽  
Kyros Yakinthos
Keyword(s):  
Structural Design ◽  
Design Procedure ◽  
Unmanned Aircraft ◽  
Content Type ◽  
Parameterized Design ◽  
Detail Design ◽  
Aerial Vehicle ◽  
Structural Parts ◽  
Long Endurance ◽  
Structural Aspects

Purpose The purpose of this paper is to present the preliminary design of a medium altitude long endurance (MALE) unmanned aerial vehicle (UAV), focusing on the interaction between the aerodynamic and the structural design studies. Design/methodology/approach The classic layout theory was used, adjusted for the needs of unmanned aircraft, including aerodynamic calculations, presizing methods and CFD, to estimate key aerodynamic and stability coefficients. Considering the structural aspects, a combination of layout, finite element methods and custom parameterized design tools were used, allowing automatic reshapes of the skin and the internal structural parts, which are mainly made of composite materials. Interaction loops were defined between the aforementioned studies to optimize the performance of the aerial vehicle, maximize the aerodynamic efficiency and reduce the structural weight. Findings The complete design procedure of a UAV is shown, starting from the final stages of conceptual design, up to the point where the detail design and mechanical drawings initiated. Practical implications This paper presents a complete view of a design study of a MALE UAV, which was successfully constructed and flight-tested. Originality/value This study presents a complete, synergetic approach between the configuration layout, aerodynamic and structural aspects of a MALE UAV.

scholarly journals Test methods for robot agility in manufacturing

2016 ◽  
Vol 43 (5) ◽  
pp. 563-572 ◽  
Author(s):  
Anthony Downs ◽  
William Harrison ◽  
Craig Schlenoff
Keyword(s):  
Industrial Robot ◽  
Test Methods ◽  
Standard Test ◽  
Simulation Environment ◽  
Robot System ◽  
Content Type ◽  
Efficiency And Effectiveness ◽  
Push Forward ◽  
World Environment ◽  
Practical Implications

Purpose This paper aims to define and describe test methods and metrics to assess industrial robot system agility in both simulation and in reality. Design/methodology/approach The paper describes test methods and associated quantitative and qualitative metrics for assessing robot system efficiency and effectiveness, which can then be used for the assessment of system agility. Findings The paper describes how the test methods were implemented in a simulation environment and real-world environment. It also shows how the metrics are measured and assessed as they would be in a future competition. Practical implications The test methods described in this paper will push forward the state of the art in software agility for manufacturing robots, allowing small and medium manufacturers to better utilize robotic systems. Originality/value The paper fulfills the identified need for standard test methods to measure and allow for improvement in software agility for manufacturing robots.

Parameters of automated fraud detection techniques during online transactions

2018 ◽  
Vol 25 (3) ◽  
pp. 702-720 ◽  
Author(s):  
Vipin Khattri ◽  
Deepak Kumar Singh
Keyword(s):  
Detection System ◽  
Fraud Detection ◽  
Security System ◽  
Research Papers ◽  
Content Type ◽  
Detection Techniques ◽  
Online Transactions ◽  
Detection Systems ◽  
Different Types ◽  
Depth Study

Purpose This paper aims to provide information of parameters and techniques used in the automated fraud detection system during online transaction. With the increase in the use of online transactions, the concerns regarding data security have also increased. To tackle the frauds, lot of research has been done and plethora of papers are available on the related topics. The purpose of this paper is to provide the clear pathway for researchers to move in the direction of development of automated fraud detection system to prevent the fraud during online transaction. Design/methodology/approach This literature review analyses and compares the different types of techniques for detecting fraud during online transaction. An in-depth study of the most prominent journals has been done and the core methodology of the papers has been presented. This article also shed some light on different types of parameters used in fraud detection techniques during online transaction. Findings There are vast varieties of various fraud detection techniques, and every technique has completed task in its own way. After studying approximately 41 research papers, 14 books and four reports, in total 30 parameters have been identified and a detailed study of the parameters has been presented. The parameters are also listed with their details that how these parameters are used in the security system for detecting online transaction fraud. Research limitations/implications This paper provides empirical insight about the parameters and their prominence in the development of automated fraud detection security system of online transaction. This paper encourages the researchers to development of improved fraud detection system. Practical implications This paper will pave the way for researchers to do a focused research on the fraud detection methodologies. The analysis will help in zeroing down the most prevalent topic of research in this field. The researchers will be able to understand the internal details of parameters and techniques used in the fraud detection systems. This literature also helps the research to think in a variety of ways that how these parameters will be used in the development of fraud detection system. Originality/value This paper is one of the most comprehensive reviews in its field. It tries and attempts to fill a void created because of lack of compilation of the laid fraud detection parameters.

Going above and beyond

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Keyword(s):  
Organizational Citizenship ◽  
Global Scale ◽  
Citizenship Behaviors ◽  
Content Type ◽  
Pertinent Information ◽  
The Individual ◽  
Person Organization Fit ◽  
Good Congruence ◽  
Practical Implications ◽  
Role Behaviors

Purpose This paper aims to review the latest management developments across the globe and pinpoint practical implications from cutting-edge research and case studies. Design/methodology/approach This briefing is prepared by an independent writer who adds their own impartial comments and places the articles in context. Findings For organizational success on a global scale, companies are looking for employees who will perform above and beyond the job description. These extra-role behaviors benefit both the individual and the organization. Good strategic human resource practices (SHRPs) such as reward management (RM) and employee development (ED) can increase the potential for employees performing such organizational citizenship behaviors (OCBs). Employees who have emotional exhaustion (EE) are likely to demonstrate reduced extra-role behaviors. Managers need to ensure there are good SHRPs in place and that employee EE is reduced. Good congruence (Person-Organization fit) is beneficial for increasing OCB. Originality/value The briefing saves busy executives and researchers hours of reading time by selecting only the very best, most pertinent information and presenting it in a condensed and easy-to-digest format.

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