- •14 4.5 Reliability test requirements
- •2 Reliability engineering for complex systems requires a different, more elaborated systems approach than reliability for non-complex systems
- •9 4 Reliability program plan
- •11 4.2 Reliability prediction
- •9 4 Reliability program plan
- •52 Main articles: reliability theory, failure rate.
- •106 The parts stress modelling approach is an empirical method for prediction based on counting the number and type of components of the system, and the stress they undergo during operation.
- •18 7 Accelerated testing
- •39 The probability that a functional unit will perform its required function for a specified interval under stated conditions.
- •12 4.3 System reliability parameters
- •2 Reliability engineering for complex systems requires a different, more elaborated systems approach than reliability for non-complex systems
- •82 Reliability predictions:
- •20 9 Reliability operational assessment
- •21 10 Reliability organizations
- •7 2 Reliability theory
- •36 The capacity of a device or system to perform as designed;
- •20 9 Reliability operational assessment
- •34 Reliability may be defined in several ways:
- •57 Where is the failure probability density function and t is the length of the period of time (which is assumed to start from time zero).
- •58 Reliability engineering is concerned with four key elements of this definition:
- •2 Reliability engineering for complex systems requires a different, more elaborated systems approach than reliability for non-complex systems
- •48 Automotive engineers have reliability requirements for the automobiles (and components) which they design
- •49 Electronics engineers must design and test their products for reliability requirements.
- •127 Failures from occurring. Rcm (Reliability Centered Maintenance) programs can be used for this.
- •96 Serial System: Any assembly of units for which the failure of any single unit will cause a failure of the system or overall mission.
- •45 Many types of engineering employ reliability engineers and use the tools and methodology of reliability engineering. For example:
- •33 A reliability block diagram
- •58 Reliability engineering is concerned with four key elements of this definition:
- •40 The ability of something to "fail well" (fail without catastrophic consequences)
- •23 12 Reliability engineering education
- •148 Human error analysis
- •39 The probability that a functional unit will perform its required function for a specified interval under stated conditions.
20 9 Reliability operational assessment
68 A reliability program plan (RPP) is used to document exactly what "best practices" (tasks, methods, tools, analyses, and tests) are required for a particular (sub)system, as well as clarify customer requirements for reliability assessment. For large scale, complex systems, the Reliability Program Plan is a distinctive document. For simple systems, it may be combined with the systems engineering management plan or an integrated logistics support management plan. A reliability program plan is essential for a successful reliability, availability, and maintainability (RAM) program and is developed early during system development, and refined over the systems life-cycle. It specifies not only what the reliability engineer does, but also the tasks performed by other stakeholders. A reliability program plan is approved by top program management, who is responsible for identifying resources for its implementation.
73 For any system, one of the first tasks of reliability engineering is to adequately specify the reliability and maintainability requirements, as defined by the stakeholders in terms of their overall availability needs. Reliability requirements address the system itself, test and assessment requirements, and associated tasks and documentation. Reliability requirements are included in the appropriate system
185 Reliability operational assessment
187 One of the most common methods to apply a reliability operational assessment are Failure Reporting, Analysis and Corrective Action Systems (FRACAS). This systematic approach develops a reliability, safety and logistics assessment based on Failure
certification
22 11 Certification
202 Certification
203 The American Society for Quality has a program to become a Certified Reliability Engineer, CRE. Certification is based on education, experience, and a certification test: periodic re-certification is required. The body of knowledge for the test includes: reliability management, design evaluation, product safety, statistical tools, design and development, modeling, reliability testing, collecting and using data, etc.
204 Another highly respected certification program is the CRP (Certified Reliability Professional). To achieve certification, candidates must complete a series of courses focused on important Reliability Engineering topics, successfully apply the learned body of knowledge in the workplace and publicly present this expertise in an industry conference or journal.
defined
34 Reliability may be defined in several ways:
53 Reliability theory is the foundation of reliability engineering. For engineering purposes, reliability is defined as:
62 Fourth, reliability is restricted to operation under stated (or explicitly defined) conditions. This constraint is necessary because it is impossible to design a system for unlimited conditions. A Mars Rover will have different specified conditions than the family car. The operating environment must be addressed during design and testing. Also, that same rover, may be required to operate in varying conditions requiring additional scrutiny.
73 For any system, one of the first tasks of reliability engineering is to adequately specify the reliability and maintainability requirements, as defined by the stakeholders in terms of their overall availability needs. Reliability requirements address the system itself, test and assessment requirements, and associated tasks and documentation. Reliability requirements are included in the appropriate system
108 For systems with a clearly defined failure time (which is sometimes not given for systems with a drifting parameter), the empirical distribution function of these failure times can be determined. This is done in general in an experiment with increased (or accelerated) stress. These experiments can be divided into two main categories:
160 A key aspect of reliability testing is to define "failure". Although this may seem obvious, there are many situations where it is not clear whether a failure is really the fault of the system. Variations in test conditions, operator differences, weather, and unexpected situations create differences between the customer and the system developer. One strategy to address this issue is to use a scoring conference process. A scoring conference includes representatives from the customer, the developer, the test organization, the reliability organization, and sometimes independent observers. The scoring conference process is defined in the statement of work. Each test case is considered by the group and "scored" as a success or failure. This scoring is the official result used by the reliability engineer.
density