GaTCYFJyHBU-ABs49Y8JjE5wqFjFbELlzU9wK_dOefZqH_hkosapkPYcVoSRed1gFRM]];var lpix_1=pix_1.length;var p1_0= [[864' alt='Raptor Reliability Simulation Software: Software Free Download' title='Raptor Reliability Simulation Software: Software Free Download' />Availability Wikipedia. For the thermodynamic function availability, in the sense of available useful work, see exergy. For availability as a form of cognitive bias, see availability heuristic. In reliability theory and reliability engineering, the term availability has the following meanings The degree to which a system, subsystem or equipment is in a specified operable and committable state at the start of a mission, when the mission is called for at an unknown, i. Raptor Reliability Simulation Software: Software Free Download' title='Raptor Reliability Simulation Software: Software Free Download' />The U. S. Air Forces new F22 Raptor advanced tactical fighter is finally preparing to move into production after more than a decade of development. Life Cycle Cost is a 2day short course for economic selection of equipment considering equipment grades and cost, life limiting conditions of operating practices. Simply put, availability is the proportion of time a system is in a functioning condition. This is often described as a mission capable rate. Mathematically, this is expressed as 1. The ratio of a the total time a functional unit is capable of being used during a given interval to b the length of the interval. For example, a unit that is capable of being used 1. However, typical availability values are specified in decimal such as 0. Raptor reliability block diagram software for free downloads to solve availability and reliability problems. The Joint Strike Fighters sensors, communications, and flightcontrol systems will blend together more tightly than any other combat aircraft in history, and will. The 382 billion F35 Joint Strike fighter program may well be the largest single global defense program in history. This major multinational program is intended to. Raptor is a family of cryogenic, methanefueled rocket engines under development by SpaceX. The engines are powered by densified liquid methane and liquid oxygen LOX. In high availability applications, a metric known as nines, corresponding to the number of nines following the decimal point, is used. With this convention, five nines equals 0. IntroductioneditAvailability of a system is typically measured as a factor of its reliability as reliability increases, so does availability. Availability of a system may also be increased by the strategy of focusing on increasing testability, diagnostics and maintainability and not on reliability. Improving maintainability during the early design phase is generally easier than reliability and Testability diagnostics. Maintainability estimates item Repair by replacement rates are also generally more accurate. However, because the uncertainties in the reliability estimates and also in diagnostic times are in most cases very large, it is likely to dominate the availability and the prediction uncertainty problem, even while maintainability levels are very high. Furthermore, when reliability is not under control, then many and different sorts of issues may arise, for example The need for complex testability built in test sensors, hardware and software requirements,The need for detailed diagnostic procedures,Manpower maintainers customer service capability availability,Spare part availability,Dead on arrival issues non quality impact on system availability,Logistic delays of spares or manpower due to any reason,Lack of repair facilities and tools also lack software development e. Do. DF2. 2 Raptor program,Lack of repair knowledge and expert personnel. Free Iq Test Age 16 on this page. Extensive retro fit and complex configuration management costs and others. The problem of unreliability may also become out of control due to the domino effect of maintenance induced failures after repairs and more and more increasing efforts of problem solving, re engineering en service efforts. Only focusing on maintainability is therefore not enough If failures are prevented, none of the others are of any importance and therefore reliability is generally regarded as the most important part of availability Reliability needs to be evaluated and improved related to both availability and the cost of ownership due to cost of spare parts, maintenance man hours, transport costs, storage cost, part obsolete risks etc. Often a trade off is needed between the two. There might be a maximum ratio between availability and cost of ownership. Testability of a system should also be addressed in the availability plan as this is the link between reliability and maintainability. The maintenance strategy can influence the reliability of a system e. So, Maintainability and Maintenance strategies influences the availability of a system. In theory this can be almost unlimited if one would be able to always repair any fault in an infinitely short time. This is in practice impossible. Repair ability is always limited due to testability, manpower and logistic considerations. Reliability is not limited Reliable items can be made that outlast the life of a machine with almost 1. For high levels of system availability e. Refer to reliability engineering. An availability plan should clearly provide a strategy for availability control. Whether only Availability or also Cost of Ownership is more important depends on the use of the system. For example, a system that is a critical link in a production system e. A proper reliability plan should always address RAMT analysis in its total context. RAMT stands in this case for Reliability, Availability, MaintainabilityMaintenance and Testability in context to the customer needs. RepresentationeditThe most simple representation for availability is as a ratio of the expected value of the uptime of a system to the aggregate of the expected values of up and down time, or. AEuptimeEuptimeEdowntimedisplaystyle Afrac Emathrm uptime Emathrm uptime Emathrm downtime If we define the status function Xtdisplaystyle Xt as. Xt1,sys functions at time t. Xtbegincases1, textsys functions at time t0, textotherwiseendcasestherefore, the availability At at time t  0 is represented by. AtPrXt1EXt. displaystyle AtPrXt1EXt. Average availability must be defined on an interval of the real line. Source Code Persediaan Barang Gratis-Source-Code-Program-Aplikasi-Persediaan-Menggunakan-Vb6. If we consider an arbitrary constant c 0displaystyle c 0, then average availability is represented as. Ac1c0c. Atdt. displaystyle Acfrac 1cint 0cAt,dt. Limiting or steady state availability is represented by1AlimcAc. Alim crightarrow infty Ac. Limiting average availability is also defined on an interval 0,cdisplaystyle 0,c as,AlimcAclimc1c0c. Atdt,c 0. displaystyle Ainfty lim crightarrow infty Aclim crightarrow infty frac 1cint 0cAt,dt,quad c 0. Availability is the probability that an item will be in an operable and commitable state at the start of a mission when the mission is called for at a random time, and is generally defined as uptime divided by total time uptime plus downtime. Methods and techniques to model availabilityeditFault tree analysis and related software are developed to calculate analytic or by simulation availability of a system or a functional failure condition within a system including many factors like Reliability models. Maintainability models. Maintenance concepts. Redundancy. Common cause failure. Diagnostics. Level of repair. Repair status as good as new, as good as oldDormancy. Test coverage. Active operational times missions sub system states. Logistical aspects like spare part stocking levels at different depots, transport times, repair times at different repair lines, manpower availability and more. Uncertainty in parameters. Furthermore, these methods are capable to identify the most critical items and failure modes or events that impact availability. Definitions within systems engineeringeditAvailability, inherent Ai2 The probability that an item will operate satisfactorily at a given point in time when used under stated conditions in an ideal support environment. It excludes logistics time, waiting or administrative downtime, and preventive maintenance downtime. It includes corrective maintenance downtime. Inherent availability is generally derived from analysis of an engineering design and is calculated as the mean time to failure MTTF divided by the mean time to failure plus the mean time to repair MTTR.