NSWC Standard 98/LE1 (Handbook of Reliability Prediction Procedures for Mechanical Equipment) is the US Naval Surface Warfare Center standard for the reliability prediction of mechanical components.
What’s in NSWC-98?
NSWC-98 uses a series of models for various categories of mechanical components to predict failure rates which are affected by temperature, stresses, flow rates and various other parameters. The categories of mechanical equipment covered by the Prediction Module are:
- Seals and Gaskets
- Valve Assemblies
- Gears and Splines
- Brakes and Clutches
- Electric Motors
- Threaded Fasteners
- Mechanical Couplings
- Slider-Crank Mechanisms
Modeling sub-systems in NSWC
Many of the categories of mechanical equipment are in fact composed of a collection of sub-components which must be modeled by the user. Typical collections include
- Valve Assemblies – poppet/sliding action assembly, seals, springs, solenoids, housing
- Pumps – shafts, seals, bearings, casing, fluid driver
- Brakes & Clutches – actuators, bearings, friction materials, seals, springs
- Couplings – gears, seals, housing
- Slider Crank – bearings, rods/shafts, seals/gaskets, actuators
- Electric Motors – bearings, motor windings, brushes, armature shaft, housing, gears
The user should be familiar with the equipment and the Handbook so that the correct type and number of sub-components can be included in the model.
The Overview of the Prediction Module page contains a description of the features available in Reliability Workbench for building a NSWC-98 model.