THE DTMB MARK 2 KNOTMETER,

Abstract

The DTMB Mark 2 Knotmeter is a portable system which measures the speed of a ship through the water at speeds from 3 to 15 knots. The system consists of a towed body, towcable, and associated electronic instrumentation. A transducer in the towed body senses the rotation of an impeller on the body and sends a signal up the towcable for display on an electronic counter, thus providing a measure of the ship speed. In contrast to many speed measuring systems, the Mark 2 Knotmeter is not influenced by the pressure field of the ship since the transducer can be located at a considerable distance from the ship. During steady towing conditions, the speed can be determined to an accuracy of about one percent. Unsteady towing conditions caused by ship motions in a seaway reduce the accuracy to between one and five percent depending on the severity of the ship motions. (Author)

Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1965
Accession Number
AD0622101

Entities

People

  • George B. Springston Jr.

Tags

Communities of Interest

  • Ground and Sea Platforms

DTIC Thesaurus Topics

  • Accuracy
  • Contrast
  • Impellers
  • Instrumentation
  • Motion
  • Rotation
  • Ship Motion
  • Towed Bodies
  • Transducers

Readers

  • Computer Science/Computer Engineering/Data Science/Digital Signal Processing.
  • Housing Policy Studies in Military Families with Privatization and Telomerase Allowance Units, Multi-Family Housing, and Telomere Lengths.
  • Naval Architecture and Marine Engineering.

Technology Areas

  • Microelectronics
  • Microelectronics - Microelectromechanical Systems