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 SOUTHWEST RESEARCH INSTITUTE

Nondestructive Evaluation

Rope and Cable Examination Using Transverse-Impulse Vibration Method

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  image of graph showing rope or cable with a flaw
 

Rope or cable with a flaw

 

image of graph showing rope or cable without a flaw

 

Rope or cable without a flaw

A transverse-impulse vibration method for examining ropes and cables was developed at Southwest Research Institute (SwRI). This patented specialized nondestructive evaluation (NDE) method is based on the familiar behavior of wave motion on a stretched, flexible string.

 

Using the SwRI method, the rope or cable is excited by applying an impulsive force with a device such as a pneumatically actuated hammer. The resulting impulse-wave motion is detected with a laser displacement or electromagnetic vibration sensor placed near one end of the rope.

 

Signals are analyzed for such parameters as service load and reduction in cross-section area from wear and corrosion, and for the presence of flaws. The method has been successfully tested on wire rope up to 1/2-inch in diameter and on synthetic rope up to 1 inch in diameter.

 

Transverse-Impulse Vibration Method Features

  • Detects localized flaws

  • Determines loss of cross-section due to wear or corrosion

  • Determines service load or tension

  • Applicable to metallic and nonmetallic ropes and cables

  • Inspects a long rope or cable (over several hundred feet) within several seconds from a single sensor location

  • Provides a permanent record

 

 

 

 

 

 

 

 

image of graph showing signal from a 40-foot-long, 3/32-inch-diameter stainless steel aircraft cable with no flaw   image of graph showing signal from a 40-foot-long, 3/32-inch-diameter stainless steel aircraft cable with a 14% reduced cross section at the midpoint of the cable length

Signal from a 40-foot-long, 3/32-inch-diameter stainless steel aircraft cable with no flaw

 

Signal from a 40-foot-long, 3/32-inch-diameter stainless steel aircraft cable with a 14% reduced cross section at the midpoint of the cable length

 

For more information about our nondestructive evaluation (NDE) capabilities, rope and cable examination using transverse-impulse vibration methods, or how you can contract with SwRI, please contact Clinton J. Thwing, at cthwing@swri.org or 210-522-3989.

 

ndesensors.swri.org

  

Contact Information

Clinton J. Thwing

Nondestructive Evaluation

(210) 522-3989

cthwing@swri.org

ndesensors.swri.org

Related Terminology

nondestructive evaluation

steel pipe inspection

corrosion

cracks

pipe wall thinning

eddy current

electric current perturbation

remote field eddy current

pulsed eddy current

computer modeling

reliability studies

specialized procedure development

specialized NDE system development

position sensing

orientation sensing

magnetic sensor

clad thickness

transverse-impulse vibration method

rope examination

cable inspection

| Sensor Systems and Nondestructive Evaluation (NDE) Technology Department | Mechanical Engineering Division | SwRI Home |

Southwest Research Institute® (SwRI®), headquartered in San Antonio, Texas, is a multidisciplinary, independent, nonprofit, applied engineering and physical sciences research and development organization with 9 technical divisions.

10/06/16