Reliability Allocation, Reliability Apportionment, RAM Allocation Consulting


RAM Allocation

System-level reliability requirements are not usually sufficient to scope the design effort. Consequently, "complex" products usually require allocating the system-level reliability requirements to lower levels.

When a product contains only a "few" parts, the allocation of reliability requirements may not be necessary or cost-effective. Functional complexity, parts count, and challenges to the state-of-the-art are some considerations in a typical allocation process. In some cases, the process is iterative. In other cases, the requirements can't be satisfied and trade-off discussions may be needed.

RAM Allocation Features

  • Allocation process is approximate.
  • Six basic allocation processes, or models.

RAM Allocation Uses

  • Establish reliability goals for hardware and software at lower levels in the system hierarchy.
  • Establish reliability requirements for supplied items.
  • Identify the need for more reliable parts.
  • Identify the need to simplify the design.
  • Identify the need to derate some or all parts.
  • Identify the need for redundancy.