Development of Small Diameter Hydraulic Coiled Tubing Technology
Abstract
The objective of this program was to develop design equations for coiled tubing as a helical extension or compression spring which has the capability of acting as a flexible fluid connector in aircraft hydraulic systems. The purpose of the coiled tube is to replace hose, swivels, or extension units on moving hydraulic actuator barrels which have linear or limited angle rotary motion. The use of 3A1-2.5V titanium cold worked stress relieved tubing is recommended for coiled tubing applications. Also recommendations are made for wall thickness for three titanium tube alloys for operating pressures of 1500, 3000, and 8000 psig. Design nomographs are provided to allow use in establishing coil tube design parameters such as number of coils and force at maximum deflection. Four coiled tube assemblies in tow configurations were subjected to a 100,000 cycle endurance test at 100% deflection of the coils. There were no failures. A vibration survey was made to determine natural frequencies and transmissibility with a random input vibration spectrum.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1981
- Accession Number
- ADA110916
Entities
People
- K. E. Whitfill
- R. B. Olsen
Organizations
- Vought