DEVELOPMENT OF DAMPING TREATMENTS FOR NEW CONSTRUCTION SUBMARINES
Abstract
An investigation was made to determine the damping behavior of specific constrained-layer treatments designed for use on new construction submarines. Each treatment consisted of an aluminum or steel constraining layer and a constrained layer of chromated felt on one or both faces of the steel test bar. The weight of the constraining layers in all treatments was equal to approximately 25% of the weight of the bar. It was concluded that treatment 198 is best for 1-3/4 inch thick steel plates. It consists of a 1-1/4 inch thick aluminum constraining layer and a 1/4 inch thick chromated felt layer fastened to one side only with 1/2 inch diameter studs spaced 12 inches apart. The nuts on the studs are tightened to 550 inch-pounds torque. Damping is at least 5% of critical over the frequency range of 50 to 1650 cps. This treatment costs approximately $19.00 per square foot to manufacture and install. Treatment 200 is best for 3/4 inch thick plates. T HIS TREATMENT IS IDENTICAL WITH TREATMENT !(* EXCEPT THAT THE CONSTRAINING LAYER IS !/< INCH THICK ALUMINUM, AND IT YIELDS ESSENTIALLY THE SAME DAMPING. Treatment 200 costs approximately $12.50 per square foot to manufacture and install. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 18, 1962
- Accession Number
- AD0270588
Entities
People
- J. Oser