Improving Dependability of Robotics Systems

2018 ◽  
pp. 6847-6858
Author(s):  
Nidhal Mahmud
Keyword(s):  
Fault Tolerant ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Cost Effective ◽  
Expressive Power ◽  
Tree Analysis ◽  
Sequential Dependencies ◽  
Dependability Analysis ◽  
Assessment Techniques ◽  
Failure Conditions

The use of robotics systems is increasingly widespread and spans a variety of application areas. From healthcare, to manufacturing, to space missions, these systems are typically conceived to perform dangerous or critical tasks. The nature of such tasks (e.g., surgery operations or radioactive waste clean-up) places high demands on the dependability of robotics systems. Fault tree analysis is among the most often used dependability assessment techniques in various domains of robotics. However, fault tree analysis of cost-effective fault tolerant robotics systems requires compositional synthesis of fault trees extended with the expressive power to allow analyzing the sequential dependencies among the components. Thereafter, a relevant experience from the automotive domain is presented. This consists mainly of a suitable synthesis approach that computes expressions of global failure conditions from the dysfunctional behavior local to the components. The benefits of the approach to dependability analysis of robotics architectures are highlighted by using a fault-tolerant example system.

Improving Dependability of Robotics Systems

2019 ◽  
pp. 1071-1084
Author(s):  
Nidhal Mahmud
Keyword(s):  
Fault Tolerant ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Cost Effective ◽  
Expressive Power ◽  
Tree Analysis ◽  
Sequential Dependencies ◽  
Dependability Analysis ◽  
Assessment Techniques ◽  
Failure Conditions

The use of robotics systems is increasingly widespread and spans a variety of application areas. From healthcare to manufacturing to space missions, these systems are typically conceived to perform dangerous or critical tasks. The nature of such tasks (e.g., surgery operations or radioactive waste clean-up) places high demands on the dependability of robotics systems. Fault tree analysis is among the most often used dependability assessment techniques in various domains of robotics. However, fault tree analysis of cost-effective fault tolerant robotics systems requires compositional synthesis of fault trees extended with the expressive power to allow analyzing the sequential dependencies among the components. Thereafter, a relevant experience from the automotive domain is presented. This consists mainly of a suitable synthesis approach that computes expressions of global failure conditions from the dysfunctional behavior local to the components. The benefits of the approach to dependability analysis of robotics architectures are highlighted by using a fault-tolerant example system.

Improving Dependability of Robotics Systems, Experience from Application of Fault Tree Synthesis to Analysis of Transport Systems

2015 ◽  
Vol 3 (2) ◽  
pp. 38-62 ◽  
Author(s):  
Nidhal Mahmud
Keyword(s):  
Electric Vehicles ◽  
Fault Tolerant ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Transport Systems ◽  
Sequential Dependencies ◽  
Novel Approach ◽  
Assessment Techniques ◽  
Tree Synthesis

The use of robotics systems is increasingly widespread and spans a variety of application areas. From manufacturing, to surgeries, to chemical, these systems can be required to perform difficult, dangerous and critical tasks. The nature of such tasks places high demands on the dependability of robotics systems. Fault tree analysis is among the most often used dependability assessment techniques in various domains of robotics. However, there is still a lack of adjustment methods that can efficiently cope with the sequential dependencies among the components of such systems. In this paper, the authors first introduce some relevant techniques to analyze the dependability of robotics systems. Thereafter, an experience from research projects such as MAENAD (European automotive project investigating development of dependable Fully Electric Vehicles) is presented; emphasis is put on a novel approach to synthesizing fault trees from the components and that is suitable for modern high-technology robotics. Finally, the benefits of the approach are highlighted by using a fault-tolerant case study.

Improving Dependability of Robotics Systems, Experience From Application of Fault Tree Synthesis to Analysis of Transport Systems

2019 ◽  
pp. 1109-1133
Author(s):  
Nidhal Mahmud
Keyword(s):  
Fault Tolerant ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
High Technology ◽  
Transport Systems ◽  
Sequential Dependencies ◽  
Novel Approach ◽  
Assessment Techniques ◽  
Tree Synthesis

The use of robotics systems is increasingly widespread and spans a variety of application areas. From manufacturing, to surgeries, to chemical, these systems can be required to perform difficult, dangerous and critical tasks. The nature of such tasks places high demands on the dependability of robotics systems. Fault tree analysis is among the most often used dependability assessment techniques in various domains of robotics. However, there is still a lack of adjustment methods that can efficiently cope with the sequential dependencies among the components of such systems. In this paper, the authors first introduce some relevant techniques to analyze the dependability of robotics systems. Thereafter, an experience from research projects such as MAENAD (European automotive project investigating development of dependable Fully Electric Vehicles) is presented; emphasis is put on a novel approach to synthesizing fault trees from the components and that is suitable for modern high-technology robotics. Finally, the benefits of the approach are highlighted by using a fault-tolerant case study.

Fault-Tolerant Cloud System Based on Fault Tree Analysis

2018 ◽  
pp. 1-9
Author(s):  
Getzi Jeba Leelipushpam Paulraj ◽  
Sharmila John Francis ◽  
J. Dinesh Peter ◽  
Immanuel John Raja Jebadurai
Keyword(s):  
Fault Tolerant ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Cloud System ◽  
Tree Analysis

Dynamic fault tree analysis of auxiliary feedwater system in a pressurized water reactor

Kerntechnik ◽  
2021 ◽  
Vol 86 (2) ◽  
pp. 164-172
Author(s):  
R. A. Fahmy ◽  
R. I. Gomaa
Keyword(s):  
Power Plant ◽  
System Reliability ◽  
Nuclear Power ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Cost Effective ◽  
Pressurized Water Reactor ◽  
Pressurized Water ◽  
Tree Analysis ◽  
Dynamic Fault Tree

Abstract The safe and secure designs of any nuclear power plant together with its cost-effective operation without accidents are leading the future of nuclear energy. As a result, the Reliability, Availability, Maintainability, and Safety analysis of NPP systems is the main concern for the nuclear industry. But the ability to assure that the safety-related system, structure, and components could meet the safety functions in different events to prevent the reactor core damage requires new reliability analysis methods and techniques. The Fault Tree Analysis (FTA) is one of the most widely used logic and probabilistic techniques in system reliability assessment nowadays. The Dynamic fault tree technique extends the conventional static fault tree (SFT) by considering the time requirements to model and evaluate the nuclear power plant safety systems. Thus this paper focuses on developing a new Dynamic Fault Tree for the Auxiliary Feed-water System (AFWS) in a pressurized water reactor. The proposed dynamic model achieves a more realistic and accurate representation of the AFWS safety analysis by illustrating the complex failure mechanisms including interrelated dependencies and Common Cause Failure (CCF). A Simulation tool is used to simulate the proposed dynamic fault tree model of the AFWS for the quantitative analysis. The more realistic results are useful to establish reliability cantered maintenance program in which the maintenance requirements are determined based on the achievement of system reliability goals in the most cost-effective manner.

scholarly journals Time-dependent reliability analysis of wind turbines considering load-sharing using fault tree analysis and Markov chains

2019 ◽  
Vol 233 (6) ◽  
pp. 1074-1085 ◽  
Author(s):  
Yao Li ◽  
Frank PA Coolen
Keyword(s):  
Wind Turbines ◽  
System Reliability ◽  
Service Providers ◽  
Fault Tree ◽  
Reliability Assessment ◽  
Fault Tree Analysis ◽  
Cost Effective ◽  
Load Sharing ◽  
Tree Analysis ◽  
Critical Components

Due to the high failure rates and the high cost of operation and maintenance of wind turbines, not only manufacturers but also service providers try many ways to improve the reliability of some critical components and subsystems. In reality, redundancy design is commonly used to improve the reliability of critical components and subsystems. The load dependencies and failure dependencies among redundancy components and subsystems are crucial to the reliability assessment of wind turbines. However, the redundancy components are treated as a parallel system, and the load correlations among them are ignored in much literature, which may lead to the wrong system’s reliability and much higher costs. For this reason, this article explores the influences of load-sharing on system reliability. The whole system’s reliability is quantitatively evaluated using fault tree analysis and the Markov-chain method. Following this, the optimisation of the redundancy allocation problem considering the load-sharing is conducted to maximise the system reliability and reduce the total cost of the system subjecting to the available system cost and space. The results produced by this methodology can show a realistic reliability assessment of the entire wind turbine from a quantitative point of view. The realistic reliability assessment can help to design a cost-effective and more reliable system and significantly reduce the cost of wind turbines.

scholarly journals Safety Assessment hydraulic system Aircraft H-8

2017 ◽  
Vol 9 (2) ◽  
pp. 39
Author(s):  
Cyrilus Sukoco Budiono
Keyword(s):  
Hydraulic System ◽  
Safety Assessment ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Assessment Process ◽  
System Safety ◽  
Markov Analysis ◽  
Tree Analysis ◽  
Failure Conditions ◽  
Secondary Power

Safety Assessment hydraulic system Aircraft H-8AbstrakSistem hidrolik termasuk secondary power yang digunakan untuk menggerakkan bidang atur kendali terbang, mengeluarkan dan melipat roda pendarat, dan memberikan tenaga pengereman ketika pesawat di darat. Kegagalan sistem hidrolik dapat menyebabkan pesawat hilang kendali sehingga memungkinkan pesawat mengalami kecelakaan dan jatuhnya korban jiwa. Penelitian ini membahas tentang penilaian keselamatan sistem hidrolik pesawat terbang H-8 yang mencakup proses penilaian keselamatan, regulasi mengenai sistem hidrolik pesawat terbang, beban-beban yang harus ditanggung oleh sistem hidrolik, dan prestasi sistem hidrolik pesawat H-8. Penilaian keselamatan dimulai dari melakukan identifikasi fungsi, kondisi kegagalan, efek kegagalan, dan mengklasifikasikan kondisi kegagalan dari sistem hidrolik tersebut.Kata kunci : System Safety Assessment (SSA), sistem hidrolik, Fault Tree Analysis (FTA), Markov Analysis (MA), Fanctional Hazard Asessment (FHA). Abstract A hydraulic system is one of the secondary power used to drive the flight control surfaces, retract and extend landing gears, and to provide power to wheel brakes when the aircraft is on the ground. The failure of the hydraulic system results in aircraft lost of control which can lead to aircraft accident and passenger deaths. This journals discusses the safety assessment of the hydraulic system to be used in H-8 aircraft which includes the safety assessment process, regulations of the aircraft hydraulic system, the hydraulic system loads, and the aircraft hydraulic systems performance. The safety assessment begins with identification and classification of the functions, failure conditions, the effects of failure, and classify the failure conditions of the hydraulic system.Key word : System Safety Assessment (SSA), hydraulic system, Fault Tree Analysis (FTA), Markov Analysis (MA), Fanctional Hazard Asessment (FHA).

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