Probability of Loss of Both Main Buses in Visual Studio .NET

Printer DataMatrix in Visual Studio .NET Probability of Loss of Both Main Buses
Probability of Loss of Both Main Buses
Data Matrix ECC200 Scanner In .NET Framework
Using Barcode Control SDK for .NET framework Control to generate, create, read, scan barcode image in .NET applications.
Probabilty of Failure of RAT to Deploy
Data Matrix Drawer In .NET Framework
Using Barcode printer for .NET framework Control to generate, create Data Matrix image in .NET applications.
1 10 3
Data Matrix ECC200 Scanner In .NET
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in VS .NET applications.
7.0 10 4
Bar Code Creator In VS .NET
Using Barcode maker for .NET framework Control to generate, create bar code image in VS .NET applications.
Probability of Loss of Main Bus 1 OR
Bar Code Reader In .NET Framework
Using Barcode recognizer for VS .NET Control to read, scan read, scan image in Visual Studio .NET applications.
Probability of Loss of Main Bus 2 OR
Making Data Matrix 2d Barcode In Visual C#
Using Barcode generator for VS .NET Control to generate, create Data Matrix 2d barcode image in VS .NET applications.
7.0 10 4
Print Data Matrix In .NET Framework
Using Barcode generator for ASP.NET Control to generate, create Data Matrix 2d barcode image in ASP.NET applications.
Probability of Loss of Generator 1
Data Matrix ECC200 Printer In VB.NET
Using Barcode printer for Visual Studio .NET Control to generate, create Data Matrix image in .NET applications.
Probabilty of Loss of GCU 1
Code 3/9 Encoder In Visual Studio .NET
Using Barcode drawer for .NET framework Control to generate, create Code39 image in .NET applications.
Probability of Loss of Generator 2
Draw UPC A In .NET
Using Barcode creation for VS .NET Control to generate, create UPC Symbol image in .NET framework applications.
Probability of Loss of GCU 2
Bar Code Generator In VS .NET
Using Barcode generator for .NET framework Control to generate, create barcode image in .NET framework applications.
5.0 10 4
Draw 2 Of 5 Industrial In VS .NET
Using Barcode creation for VS .NET Control to generate, create 2 of 5 Industrial image in VS .NET applications.
2.0 10 4
Bar Code Generator In VB.NET
Using Barcode maker for Visual Studio .NET Control to generate, create bar code image in .NET framework applications.
5.0 10 4
EAN / UCC - 14 Generation In Visual Studio .NET
Using Barcode creation for ASP.NET Control to generate, create EAN / UCC - 14 image in ASP.NET applications.
2.0 10 4
Draw UCC - 12 In VB.NET
Using Barcode maker for .NET framework Control to generate, create GTIN - 128 image in .NET applications.
Simpli ed FTA for an aircraft electrical power system
Generating Code 128 Code Set C In Visual C#.NET
Using Barcode creation for VS .NET Control to generate, create Code128 image in .NET applications.
Starting in the bottom left hand portion of the diagram: the Mean Time Between Failure (MTBF) of a generator is 2000 hours this means that the failure rate of Generator 1 is 1/2000 or 5 0 10 4 per ight hour. Similarly if the MTBF of the generator controller GCU 1 is 5000 hours then the failure rate of GCU 1 is 1/5000 or 2 0 10 4 per ight hour. The combined failure rate gives the probability of loss of electrical power to Main Bus 1. This is calculated
Data Matrix Drawer In Visual Basic .NET
Using Barcode printer for VS .NET Control to generate, create DataMatrix image in VS .NET applications.
System Design and Development
European Article Number 13 Encoder In Visual Basic .NET
Using Barcode drawer for .NET framework Control to generate, create UPC - 13 image in .NET framework applications.
by summing the failure rates of generator and controller as either failing will cause the loss of Main Bus 1: = 5 0 10 4 + 2 0 10 4 = 7 10 4 per ight hour (Generator 1)(GCU 1)(Main Bus 1) Similarly, assuming generator channels 1 and 2 are identical the failure rate of Main Bus 2 is given by: = 5 0 10 4 + 2 0 10 4 = 7 10 4 per ight hour (Generator 2) (GCU 2)(Main Bus 2) (Note that at this state the experienced aircraft systems designer would be considering the effect of a common cause or common mode failure.) The probability of two independent channels failing (assuming no common cause failure) is derived by multiplying the respective failure rates. The probability of both Main Buses failing is: = 7 10 4 7 10 4 = 49 10 8 or 4 9 10 7 per ight hour (Main Bus 1) (Main Bus 2) Therefore the two independent electrical power channels alone will not meet the requirement. Assuming the addition of the Ran Air Turbine (RAT) emergency channel as shown in the gure, the probability of total loss of electrical power = 4 9 10 7 1 10 3 = 4 9 10 10 per ight hour which meets the requirements (Main Bus) (RAT failure) (Main Bus 2) This very simple example is illustrative of the FTA which is one of the techniques used during the PSSA and SSA processes. However, even this simple example outlines some of the issues and interactions which need to be considered. Real systems are very much complex with many more system variables and interlinks between a number of aircraft systems.
UCC - 12 Creation In Java
Using Barcode generation for Java Control to generate, create EAN128 image in Java applications.
11.6 Dependency Diagram
UCC-128 Printer In Visual C#
Using Barcode generator for VS .NET Control to generate, create USS-128 image in VS .NET applications.
The dependency diagram offers an alternative tool to the FTA for the analysis of architectural alternatives and also to establish whether a particular architecture will meet its mandated integrity goal. As for the FTA, the approach offered by the dependency diagram is best served by using a simple system example in this case the electrical system analysis. The dependency diagram has the super cial advantage that its structure maps readily on to a system architecture diagram as shown in Fig 11.7. Dependencies are shown in series or parallel form:
Dependency Diagram
Ploss of Element A
Ploss of Element B
Ptotal
Ploss of Element C
Ptotal = Pfail A + Pfail B
Ploss of Element D Ploss of Channel 1
Ptotal
ELECTRICAL CHANNEL 1 Ploss of Generator 1 Ploss of GCU 1
Ptotal = Pfail C Pfail D
7 10 4
5 10 4 5 10 4
Ploss of Generator 2
2 10 4
2 10 4
Ploss of Both Channels
Ploss of GCU 2
4.9 10 7 7 10 4
Ploss of Channel 2
4.9 10 10
1 10 3
Pfail of RAT Deployment EMERGENCY CHANNEL
Ploss of All Electrical Power
ELECTRICAL CHANNEL 2
Electrical system dependency diagram example
In a situation where both elements of a particular function need to be operative theses are shown in series; a failure of either element A or element B will deny the total function. The analysis adds the contribution of each element to give the function total Where elements are replicated for reasons of redundancy or backup the elements are shown in parallel; a failure of element C and element D is required to deny the overall function. The analysis multiplies the element contributions to give the function total The values that populate the analysis are the element predicted or actual failure rates. Taking the electrical system failure rates used in the previous example:
Failure rate of Main Bus 1 = Failure rate of Main Bus 2 = Failure rate of Both Electric Channels = Failure of RAT Emergency Source = Total failure of Electrical System = 5.0 10 4 + 2.0 10 4 Generator 1Control Unit 1 5.0 10 4 + 2.0 10 4 Generator 2Control Unit 2 7 10 4 7 10 4 Main Bus 1Main Bus 2 1.0 10 3 4.9 10 7 1.0 10 3 Channel 1 + Emergency Channel 2 Source = 7.0 10 4 Main Bus 1 = 7.0 10 4 Main Bus 2 = 4.9 10 7 Both Buses
= 4.9 10 10