%0 Conference Paper %B 58th Annual Conference, San Jose, California, May 24-26 %D 1999 %T 2466. Total Ship Weight Management Computer Program - For Today's and Tomorrow's Applications %A Ray, D %A Filiopoulos, C %K 13. Weight Engineering - Marine %X Real-Time Ship Design Weight Estimate (RTSDWE99) is a comprehensive mass properties application that provides a sophisticated user interface along with the latest database technology to aid the mass properties engineer in preparing, monitoring, and predicting mass properties data as required by the Society of Allied Weight Engineers (SAWE) Recommended Practice No. 12, rev B. The software is based on established weight estimating methodologies built-into older software versions and expands those concepts along other newer ones by taking advantage of the capabilities and flexibility offered by the latest technologies in Graphical User Interfaces (GUIs), relational database functionality, and connectivity. With the addition of a new module for tracking engineering change proposals, and work-in-progress on the feasibility weight estimate module, RTSDWE99 has been transformed into an integrated system that can support mass properties operations from cradle-to-grave. RTSDWE99 calculates weights, moments, ship?s center-of-gravity, hydrostatics, moments-of-inertia, engineering changes, twenty station longitudinal weight distribution, and also facilitates external ad-hoc queries to the mass properties database The application was developed using MS Visual C++ and C, and is intended primarily for PC operation with Windows 95/98 or NT operating systems. The application has the capability to communicate with various Database Management Systems (DBMS) such as ACCESS, ORACLE, and INFORMIX by the use of Open Database Connectivity (ODBC) interface. The application software is comprised of dialog panels and child panels that help the user in preparing weight estimates. The dialog panels are tied to several database tables, and each panel has a fixed set of database functions. Functions are provided either by pull-down menus or standard and familiar database icons. These panels along with the standard database capabilities of search, add, modify, and delete, provide other advanced capabilities such as, modify-by- group, Query-by-Example, and others. The software has the capability to track several variants of a specific design within the same database. Also, an open dictionary capability is provided to track the engineering change proposals (ECPs) process, since this process is customized for each procurement program. ECPs are tracked from the proposal stage to the final adjudication and incorporation into the weight estimate. The program gathers mass properties information according to the requirements of the Society of Allied Weight Engineers (SAWE) Recommended Practice No. 12, rev B, through the use of interface panels by manual input, existing data - master files input, and properly structured output from computer aided design (CAD) systems. The software has extensive reporting capabilities. Output may be reported in several formats, such as customized text output, MS Word, MS Excel, and several other formats. The software provides for a full range of weight report options such as one, two, three digit and full or partial details, and various ECP reports. %B 58th Annual Conference, San Jose, California, May 24-26 %I Society of Allied Weight Engineers, Inc. %C San Jose, California %P 35 %8 5/24/99 %G eng %U https://www.sawe.org/papers/2466/buy %9 13. WEIGHT ENGINEERING - MARINE %M 2466 %1 Non-Member Price: $20.00; Member Price: $10.00 Members: First 10 product downloads are Free. %2 10.00 %3 20 %4 SAWE2466 %0 Conference Paper %B 57th Annual Conference, Wichita, Kansas, May 18-20 %D 1998 %T 2416. Initial Applications of the Product Model in Developing Weight Estimates %A Filiopoulos, C %A Marcavage, J %A Ray, D %A Tschabold, Gerald %K 13. Weight Engineering - Marine %X Traditional weight engineering skills and approaches, such as having in-depth knowledge of ship systems, historical data, and adequate manpower for drawing calculations may not be sufficient to produce quick and accurate weight estimates in today's acquisition reform-minded environment. As demand for technological and business innovation is increasing for upcoming designs, 3D-product modeling is expected to become a standard tool for design, manufacturing, and logistical support. Each CAD system offers certain inherent advantages and disadvantages. Therefore, weight engineers must make up for CAD system deficiencies or customize and expand CAD capabilities. They must have a working knowledge of relational databases and information extractions from design files to produce accurate results faster than the traditional labor-intensive approaches. However, since weight control is a time-based projection, starting from feasibility studies till the end of construction, traditional weight estimating methods must be maintained and integrated with product model data to project the mass properties of the ship, as required. The LPD 17 design has been the test case of the implementation of the Navy's CAD system for preliminary and contract designs. This paper describes our initial experiences in the mass properties area and the lessons learned. %B 57th Annual Conference, Wichita, Kansas, May 18-20 %I Society of Allied Weight Engineers, Inc. %C Wichita, Kansas %P 31 %8 5/18/98 %G eng %U https://www.sawe.org/papers/2416/buy %9 13. WEIGHT ENGINEERING - MARINE %M 2416 %1 Non-Member Price: $20.00; Member Price: $10.00 Members: First 10 product downloads are Free. %2 10.00 %3 20 %4 SAWE2416 %0 Conference Paper %B 56th Annual Conference, Bellevue, Washington, May 19-21 %D 1997 %T 2356. Weight and KG Margin Analysis of Naval Surface Ships %A Dominick Cimino %A Filiopoulos, C %K 13. Weight Engineering - Marine %X Effective weight and KG (height of vertical center of gravity above the keel acquisition margins are an essential element of the US Navy Weight Control Program. Acquisition margins are not only an engineering tool for making technical predictions, but impact the fiscal process as well. The need for continued improvement in margin determination was recognized when the weight control program was formulated in 1961. The first improvement came with the establishment of a formal margin policy in 1963. The values, restricted to weight at that time, reflected the best corporate engineering judgment based on scattered and, in many cases, unverified weight growths. Because the shipbuilding process is relatively long (compared to aircraft, land vehicle and missile production), it took fifteen years to accumulate a data base large enough to be considered reasonable for a statistical study of margins. In 1978 this data base was used to update the Weight Margin Policy for Surface Ships and expand it to include a KG margin policy, as well. In 1992, a study was undertaken to update the data base and find an appropriate statistical basis for margins prediction with an associated risk management approach to margin selection. This study verified the results of the 1978 study and supplemented the 1978 study by expanding and updating the Design & Build (D&B), Contract Modification (Con Mod), and Government Furnished Material (GFM) data sets. This paper discusses the statistical results of the data, and includes recommendations for updating the current NAVSEA Weight and KG Margin Policy. In addition, a formal margin selection method is presented which produces margins for each design phase and an associated quantifiable risk of exceeding them. Using this method, a Ship Design Manager working with the weight engineer (mass properties) can select a level of risk appropriate for his (her) design and determine weight and KG margin values associated with this risk. %B 56th Annual Conference, Bellevue, Washington, May 19-21 %I Society of Allied Weight Engineers, Inc. %C Bellevue, Washington %P 40 %8 5/19/97 %G eng %U https://www.sawe.org/papers/2356/buy %9 13. WEIGHT ENGINEERING - MARINE %M 2356 %1 Non-Member Price: $20.00; Member Price: $10.00 Members: First 10 product downloads are Free. %2 10.00 %3 20 %4 SAWE2356