LONGITUDINAL STIFFNESS OF MAIN THRUST BEARING FOUNDATIONS
The difficulty of establishing an accurate spring-mass system with which longitudinal vibration characteristics of a ship may be estimated is generally complicated by the need to accurately calculate or estimate the required masses and stiffnesses. The stiffness of the thrust-bearing foundation is no exception; the wide variation in foundation arrangements and the continuity of the thrust bearing and machinery foundations with the ships' innerbottom combine to make this perhaps the most difficult stiffness to calculate. Thus, it is the intent of the following discussion and example to help provide some guidance in making the proper assumptions and calculations required to calculate the stiffness of the thrust-bearing foundation. It should be noted that this stiffness does not deal with the thrust bearing and its housing, but only with the foundation to the point where it bolts to the thrust-bearing housing.
- Prepared by Panel M-20 (Machinery Vibrations) of Ships' Machinery Committee.
Society of Naval Architects and Marine Engineers601 Pavonia Avenue
Jersey City, NJ United States 07306-2907
- Publication Date: 1972-9
- Features: References;
- Pagination: 18 p.
- TRT Terms: Bridge bearings; Deflection; Foundations; Plates (Engineering); Shear stress; Stiffness; Vibration
- Old TRIS Terms: Bearing foundation stiffness; Foundations (Structures); Plate deflections; Shear stiffness
- Subject Areas: Marine Transportation; Materials;
- Accession Number: 00041861
- Record Type: Publication
- Source Agency: Society of Naval Architects and Marine Engineers
- Report/Paper Numbers: R-15 Tech, Res
- Files: TRIS
- Created Date: Apr 23 1973 12:00AM