Non-destructive testing of in-service wooden beams

Details Non-destructive testing of in-service wooden beams Non-destructive testing of in-service wooden beams

2006-12-12

2006-12-12

Noori, Max (Department: 2855)

Measuring and testing

Testing by impact or shock

Specimen impactor detail

Reexamination Certificate

active

07146846

ABSTRACT:
Wooden utility pole structures are nondestructively tested while in service, in particular utility pole cross-arms. A helicopter or boom truck brings an operator to the cross-arm. Manually striking the cross-arm using a hammer or other weight with an attached accelerometer senses and sends a shock wave through the cross-arm. The shock wave also is sensed using a second accelerometer sensor in a temporarily affixed sensor pod at the other end of the cross-arm, or alternatively, a non-contact radar vibration sensor is trained on a fastener in the cross-arm, to sense vibration from the shock wave. Practical aspects include mounting particulars for affixing the sensor pod against the cross-arm, manipulating the sensor pod at an elevation below the helicopter working platform, measurements for dimensions and density, etc. The data is received at a processor and correlated with structural strength or used to rank the relative strength of cross-arms.

REFERENCES:
patent: 4084427 (1978-04-01), Jacoby et al.
patent: 4542639 (1985-09-01), Cawley et al.
patent: 4881405 (1989-11-01), Paquet
patent: 4956999 (1990-09-01), Bohannan et al.
patent: 5000030 (1991-03-01), Umeda et al.
patent: 5024091 (1991-06-01), Pellerin et al.
patent: 5048320 (1991-09-01), Mitsuhashi et al.
patent: 5703294 (1997-12-01), McConnell et al.
patent: 6257064 (2001-07-01), Duron
patent: 6505130 (2003-01-01), Springer, III et al.
patent: 6598485 (2003-07-01), Lin et al.
patent: 6695719 (2004-02-01), Maruoka
patent: 6748791 (2004-06-01), Georgeson et al.
patent: 6865925 (2005-03-01), Albertini et al.
“An Overview of the Wood in Transportation Program in the United States,” DUWADI, S.R. et al., Proceedings of the 5th World Conference on Timber Engineering, vol. 1, p. 32, 1998.
“In situ' Nondestructive Testing of Built in Wooden Members,” Zombori, B., NDT.net, vol. 6, No. 3, 2001.

Affiliated with

Also associated with

Rating

Non-destructive testing of in-service wooden beams does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Non-destructive testing of in-service wooden beams, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Non-destructive testing of in-service wooden beams will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3695522