scholarly journals Reliability of computer structures of integrated modular avionics for hardware configurations

2021 ◽  
pp. 84-93
Author(s):  
Iryna Kozlyuk ◽  
Yuliia Kovalenko
Keyword(s):  
Modular Construction ◽  
Design Standards ◽  
Computing Systems ◽  
Failure State ◽  
Internal Network ◽  
Hardware Component ◽  
Integrated Modular Avionics ◽  
Testing Algorithm ◽  
Advanced Computing ◽  
And Control

The problem of designing advanced computing systems in the class of structures of integrated modular avionics is considered. The unified topology of the internal network of the computer on the basis of Space Wire exchange channels and variants of its execution for various onboard applications is offered. Equivalent reliability schemes of each of the specific structures are introduced and the probabilities of trouble-free operation of each structure are analyzed. Families of graphic dependencies are given. The analysis of the existing principles and algorithms for testing multiprocessor multimodal onboard digital computer systems is given; the new testing algorithm for the multiprocessor systems which follows the software design standards for products of integrated modular avionics is offered. The structure of the unified automated workplace for checking the functional modules of integrated modular avionics is considered. Specific requirements inherent in the workplaces for testing integrated avionics are identified: an increased level of control of the hardware component of products; the ability to simulate the failure state of individual components of avionics to check the mode of reconfiguration of the computer system; modular construction of software with the division of verification tests into components performed at the level of each CPM and the computer as a whole in single-task and multitasking modes; openness of architecture of a workplace, which provides an ability to change the level of control complexity of a product and control of one class of complexity; intra-project unification of both hardware and software of the workstation of the inspection.

Reliability Evaluation of Integrated Modular Avionics Computational Structures for Different Hardware Configurations

2016 ◽  
Vol 685 ◽  
pp. 350-354 ◽  
Author(s):  
Ekaterina Kniga ◽  
Igor Zharinov ◽  
Anatolii Shukalov ◽  
Vladimir Nechaev
Keyword(s):  
Reliability Evaluation ◽  
Special Structure ◽  
Computing Systems ◽  
Internal Network ◽  
Integrated Modular Avionics ◽  
Fail Safe ◽  
Advanced Computing ◽  
Safe Performance ◽  
Computational Structures

The problem of designing advanced computing systems of integrated modular avionics is considered in this paper. A unified topology of internal network based on SpaceWire channels and options for its application for a variety of onboard implementations are proposed. Equivalent reliability scheme of each special structure is provided and the fail-safe performance probability of each structure is analyzed.

Integrating critical chain project management with last planner system for linear scheduling of modular construction

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Tarek Salama ◽  
Ahmad Salah ◽  
Osama Moselhi
Keyword(s):  
Project Management ◽  
Control Procedure ◽  
Modular Construction ◽  
Content Type ◽  
Linear Scheduling ◽  
Last Planner System ◽  
Critical Chain Project Management ◽  
Last Planner ◽  
And Control ◽  
Critical Chain

Purpose The purpose of this paper is to present a new method for project tracking and control of integrated offsite and onsite activities in modular construction considering practical characteristics associated with this type of construction. Design/methodology/approach The design embraces building information modelling and integrates last planner system (LPS), linear scheduling method (LSM) and critical chain project management (CCPM) to develop tracking and control procedures for modular construction projects. The developed method accounts for constraints of resources continuity and uncertainties associated with activity duration. Features of proposed method are illustrated in a case example for tracking and control of modular projects. Findings Comparison between developed schedule and Monte Carlo simulation showed that baseline duration generated from simulation exceeds that produced by developed method by 12% and 10% for schedules with 50% and 90% confidence level, respectively. These percentages decrease based on interventions of members of project team in the LPS sessions. The case example results indicate that project is delayed 5% and experienced cost overrun of 2.5%. Originality/value Developed method integrated LPS, LSM and CCPM while using metrics for reliability assessment of linear schedules, namely, critical percent plan complete (PPCcr) and buffer index (BI). PPCcr and BI measure percentage of plan completion for critical activities and buffer consumption, respectively. The developed method provides a systematic procedure for forecasting look-ahead schedules using forecasting correction factor Δt and a newly developed tracking and control procedure that uses PPCcr and BI. Quantitative cost analysis is also provided to forecast and monitor project costs to prove the robustness of proposed framework.

scholarly journals Integrity Management of Marine Structures; With Emphasis on Design for Structural Robustness

2018 ◽  
Author(s):  
Torgeir Moan
Keyword(s):  
Structural Damage ◽  
Structural Integrity ◽  
Oil And Gas ◽  
Offshore Structures ◽  
Design Standards ◽  
Limit States ◽  
Fabrication Errors ◽  
Integrity Management ◽  
Operational Errors ◽  
And Control

Based on relevant accident experiences with oil and gas platforms, a brief overview of structural integrity management of offshore structures is given; including an account of adequate design criteria, inspection, repair and maintenance as well as quality assurance and control of the engineering processes. The focus is on developing research based design standards for Accidental Collapse Limit States to ensure robustness or damage tolerance in view damage caused by accidental loads due to operational errors and to some extent abnormal structural damage due to fabrication errors. Moreover, it is suggested to provide robustness in cases where the structural performance is sensitive to uncertain parameters. The use of risk assessment to aid decisions in lieu of uncertainties affecting the performance of novel and existing offshore structures, is briefly addressed.

Self-Conscious Modeling (Modellierung bewusster Systeme)

2005 ◽  
Vol 47 (4) ◽  
Author(s):  
Kirstie L. Bellman
Keyword(s):  
Computing Systems ◽  
Computer Based ◽  
Generative Processes ◽  
And Control ◽  
Reflective Systems ◽  
Complex Computer ◽  
Organic Computing ◽  
Monitor And Control

SummuryIncreasingly diverse and complex computer-based support underlies critical human processes, such as education, commerce, medicine, science, defense, and government. These systems are fed massive amounts of data and due to the complexity and size of these systems, they are integrating and interfacing with each other with less human oversight. Soon, they will need to build, refine, and elaborate their own models and processes, making more decisions about what information to use in what manner and how to approach problems or goals. Hence, these systems must be able to reason about and report out to us their modeling and processing choices in order to help us monitor and control their operations and interactions. In this paper, we discuss our work on creating reflective systems, and how reflection coupled with “generative processes” and “cognitive instrumentation” will help enable organic computing systems. We then briefly describe our testbed for studying self-conscious modeling.

Thermal Analysis of a DC Motor Cooling System Availing an Engine Test Stand of Electrical Race Car

2015 ◽  
Vol 809-810 ◽  
pp. 1145-1150 ◽  
Author(s):  
Maja Baier ◽  
Mateusz Dziewior ◽  
Jakub Franiasz ◽  
Michal Zuk
Keyword(s):  
Thermal Analysis ◽  
Cooling System ◽  
Dc Motor ◽  
Test Stand ◽  
Measuring System ◽  
Engine Test ◽  
Modular Construction ◽  
Race Car ◽  
Motor Cooling ◽  
And Control

Thermal analysis of a DC motor cooling system and description of measurement system applied to an engine test stand are the main topics of the paper. The motor that is being tested comes from the electric vehicle of Silesian Greenpower project whose aim is to design and build energy efficient bolids in order to participate in international races in Great Britain. During the designing process of the car, minimizing energy losses and maximizing powertrain efficiency are the main aspects taken into consideration. One of the crucial issues to accomplish these goals is to maintain optimal performance of the motor by applying effective cooling. The engine test stand used in this research was designed especially for Silesian Greenpower vehicles. Thanks to its modular construction and versatility, it enables measuring many different parameters of the motor and powertrain. In this paper the thermal analysis is described as well as how the measuring system of the engine stand works. The thermal analysis described in the article occurred to be very helpful in improving the cooling system and motor performance in the same time. The advanced measuring and control system of the test stand enables conducting versatile analysis of the DC motor and the powertrain.

scholarly journals Safety analysis for integrated modular avionics based on blueprints

2018 ◽  
Vol 169 ◽  
pp. 01029
Author(s):  
Jiayun Chu ◽  
Xiaohong Bao ◽  
Tingdi Zhao ◽  
Fuchun Ren
Keyword(s):  
Matrix Theory ◽  
Safety Analysis ◽  
System Management ◽  
Core Technology ◽  
Integrated Modular Avionics ◽  
Management Functions ◽  
New Generation ◽  
And Control ◽  
Relationship Of ◽  
The Mathematical Model

The Integrated Modular Avionics System (IMA) has been a core technology for the new generation of aircrafts in recent years. It consists of a set of reusable and interoperable common functional modules. However, the highly coupled relationship of resources makes it difficult to identify and control dangers. As an effective and efficient way, the blueprints are used to describe and manage the IMA system. Owing to the system management functions provided by the blueprints, we can accurately determine the system resources configuration status, which is very crucial for safety analysis. In this paper, we explore the possibilities to conduct safety analysis based on blueprints. A safety analysis method based on blueprints is proposed, which applies mathematical logic to describe the logical relationship between targets and resources provided by the blueprints and uses semi-tensor product of matrix theory to simplify the logical expressions. Based on the mathematical model, we can conduct the fail safety analysis and identify resources failures that may undermine the IMA system safety.

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