Banner for LabNotes
From Lab Notes
Contact Information
Forest Products Laboratory
One Gifford Pinchot Drive
Madison, WI 53726-2398
Phone: (608) 231-9200
Fax: (608) 231-9592
Email

 

You are here: FPL Home  / Information Products & Services  / Publications

Requested Product

Title: Stress wave velocity patterns in the longitudinal-radial plane of trees for defect diagnosis

Source: Computers and Electronics in Agriculture

Author(s)Li, Guanghui; Weng, Xiang; Du, Xiaocheng; Wang, Xiping; Feng, Hailin

Publication Year: 2016  View PDF »

Category: Journal Articles
Associated Research Project(s):   FPL-4714-1B

Abstract: Acoustic tomography for urban tree inspection typically uses stress wave data to reconstruct tomographic images for the trunk cross section using interpolation algorithm. This traditional technique does not take into account the stress wave velocity patterns along tree height. In this study, we proposed an analytical model for the wave velocity in the longitudinal–radial (LR) plane of a live tree. Both field and laboratory stress wave testing were conducted to determine the stress wave velocity patterns in healthy and defective trees. The results showed that the ratio of the wave velocity at a propagation path angle 0 (with respect to the radial direction) to the radial velocity in healthy trees approximated a second-order parabolic curve with respect to the symmetric axis (h = 0). Our analysis of the velocity patterns indicated that the measured velocities in healthy trees were in a good agreement with the theoretical models. The results of this preliminary study indicated that the stress wave velocity patterns can be used to diagnosis internal defects in urban trees and improve the accuracy of 3D tomographic images in tree inspection applications.

Keywords: Defect; Inspection; Nondestructive testing; Stress wave velocity; Urban trees

Publication Review Process: Formally Refereed

File size: 1,024 kb(s)

Date posted: 05/24/2016

This publication is also viewable on Treesearch:  view
RITS Product ID: 79253
Current FPL Scientist associated with this product
Wang, Xiping
Research Forest Products Technologist
  

Additional items that might interest you
View the video celebrating FPL's 100 years of public service in 2010, from the producers of the Greatest Good....view

Research Highlights from FPL....view

Termite Eradication: A search for the Holy Grail.... view

Moisture Management in Residential Construction Series videos...view

Wood Floor Systems in Residential Construction Series videos....view
- FPL's Mission and Strategic Plan -

FPL's mission is to identify and conduct innovative wood and fiber utilization research that contributes to conservation and productivity of the forest resource, thereby sustaining forests, the economy, and quality of life. ... ..more »

- FPL Research Emphasis Areas -
Advanced Composites

As an integral part of the FPL mission, we improve the long-term sustainability of our Nation's forests by creating valuable composite products from biobased materials ... ..more »


Advanced Structures

The FPL has been in the forefront of wood-frame housing research since 1910 and has long been recognized as a world leader in such housing-related areas as engineered wood ... ..more »


Forest Biorefinery

We all know the compelling reasons that the United States needs to reduce its dependence on fossil fuels. Historically, the greatest increases in energy demand have been for transportation fuels ... ..more »


Nanotechnology

A leader in wood products research for over a century, the FPL is positioning itself to become the lead Federal research facility for the application of nanotechnology in forest products ... more »


Woody Biomass Utilization

Forests in the United States contain a substantial amount of small-diameter, overstocked, and underutilized material.FPL research projects are exploring the potential of the small-diameter ... ..more »