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NPRD-2011 |
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NPRD-2011 |
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NPRD-2011
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NPRD-2011 |
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NPRD-2011 |
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RAM Commander incorporates the NPRD-2011 (Non-electronic Parts Reliability Data) reliability prediction method. This method is applied to mechanical and other non-electronic parts.
NPRD database contains information on failure rates for various non-electronic parts keyed by part family, Item type, part description, environment and quality level. NPRD failure rates are not given for all combinations of these parameters. RAM Commander attempts to find the failure rate using two sets of data: Automatic search and Manual selection. You can tell RAM Commander how to perform the search:
| • | Automatic search only |
| • | Automatic search, then manual selection if not found |
| • | Manual selection only |
On the NPRD-2011 screen, you need to define the appropriate Part Description which describes, in the best way, your specific part. Then you need to select the Quality level. After all this selections according with Part Description + Environment + Quality – RAM Commander search for FR in NPRD-2011 database. Two scenarios may occur: a) the FR exists in the NPRD-2011 for selected set of data; b) there is not FR for selected set of the data (because NPRD failure rates are not given for all combinations of these parameters).
To solve situation for scenario b) you need to use the Secondary Choice, where you can define similar part/description/quality level/environment – not exact as you have in the system but as close as possible.
Secondary Choice also exists to support situation when NPRD-2011 contains FR for conditions specified (for example for environment GB) (scenario a), but when you change environment in the product tree settings (e.g. to GF), you may come to situation where NPRD-2011 does not contain exact FR for these new settings any more (scenario b) - and then RAM Commander may take data according to the Secondary choice, if defined.
To calculate a failure rate (FR) for a part using NPRD-2011, you must first define its calculation method as NPRD-2011.
| 1. | Click the NPRD-2011 button in the Item Data dialog. |
The part's NPRD-2011 dialog box opens:
The NPRD-2011 provides data form much larger variety of component types than you can find in the standard list of RAM Commander’s Item types.
Part type may be defined automatically by RAM Commander, or you may use NPRD-2011 search to find the required part type.
To start the search,
| 1. | Press “Search” button. The Search dialog will appear. |
| 2. | Type Part number you want to find (or part of it) and press the “Search” button. |
| 3. | The list of suitable search results will appear: |
| 4. | Select the part from the search results and press OK. |
The next steps are very similar to NPRD-95.