Guidelines for Reliability-Based, Weight-Optimized Design of Primary Structural Components of Aircraft Carriers CVN(X)

Period of Performance: 12/06/2002 - 12/06/2004

$750K

Phase 2 SBIR

Recipient Firm

BMA Engineering, Inc.
11429 Palatine Drive
Potomac, MD 20854
Principal Investigator

Abstract

The objectives of Phase II are to develop guidelines for the reliability-based, weight-optimized design of primary structural components of aircraft carriers, such as the CVN(X), subjected to vertical and lateral wave loads. The guidelines will provide realistic, extreme primary hull girder load estimates necessary to facilitate the application of reliability-based methods for investigating the possibility of weight savings for aircraft carrier. An empirical-analytical methodology will be developed based on sea trials, time-domain histories and extreme value analysis that uses empirical data, operation profiles and motion analysis. Commercial software will be identified and demonstrated for this purpose. The specific tasks needed to achieve these objectives of the proposed effort can be enumerated as follows: 1. Assessment of primary loads that include vertical and lateral wave loads with their dynamic effects and dependancy; 2. Assessment of extreme lifetime loads in a design life to determine their probabilistic characteristics for design purposes; 3. Assessment of load combinations for wave, dynamic, vertical and lateral effects; 4. Evaluation of ultimate strength for primary structural members, and fatigue strength; 5. Development of weight-optimization procedure; 6. Demonstration of the methods and procedures; and 7. Identification and demonstration of software needed to support such designs. BENEFITS: The marine industry needs guidance on the reliability-based, weight-optimized design of primary structural components of aircraft carriers, such as the CVN(X), subjected to vertical and lateral wave loads. The product from this Phase II will be design guidelines that will accurately, effectively and efficiently assess loads for aircraft carriers for the purpose of performing reliability-based designs by properly accounting for relevant uncertainties. Such design methods offer the potential for weight savings. The anticipated product from this SBIR effort would help in meeting the needs of the industry.