NZ506496A - Maximising value of sawn timber by measuring modulus of elasticity by stress wave analysis - Google Patents
Maximising value of sawn timber by measuring modulus of elasticity by stress wave analysisInfo
- Publication number
- NZ506496A NZ506496A NZ50649600A NZ50649600A NZ506496A NZ 506496 A NZ506496 A NZ 506496A NZ 50649600 A NZ50649600 A NZ 50649600A NZ 50649600 A NZ50649600 A NZ 50649600A NZ 506496 A NZ506496 A NZ 506496A
- Authority
- NZ
- New Zealand
- Prior art keywords
- board
- elasticity
- value
- measured
- stress wave
- Prior art date
Links
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The modulus of elasticity (MOE) of a board is determined by striking one end of the board with a pneumatic hammer, and measuring the velocity of the resultant stress waves. This stress wave velocity (SWV) can be used to determine the MOE, which can then be used by a computerized lumber breakdown unit to maximize the value of timber cut from the board. The SWV is measured by a signal acquisition unit 22 that is moved up against one end of a board 50. The distance moved is measured, together with the distance to the other end of the board measured by laser 24. This enables the length of the board to be determined so that the SWV can be measured with the aid of accelerometer in the signal acquisition unit 22 which is moved in to contact with the end of the log.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US37997499A | 1999-08-24 | 1999-08-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
NZ506496A true NZ506496A (en) | 2002-08-28 |
Family
ID=23499442
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
NZ50649600A NZ506496A (en) | 1999-08-24 | 2000-08-22 | Maximising value of sawn timber by measuring modulus of elasticity by stress wave analysis |
Country Status (2)
Country | Link |
---|---|
CA (1) | CA2316046C (en) |
NZ (1) | NZ506496A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7017413B2 (en) * | 2004-03-31 | 2006-03-28 | Weyerhaeuser Company | Methods for quantitatively determining lengthwise shrinkage in wood products |
-
2000
- 2000-08-16 CA CA 2316046 patent/CA2316046C/en not_active Expired - Lifetime
- 2000-08-22 NZ NZ50649600A patent/NZ506496A/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
CA2316046A1 (en) | 2001-02-24 |
CA2316046C (en) | 2006-01-24 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
RENW | Renewal (renewal fees accepted) | ||
PSEA | Patent sealed | ||
RENW | Renewal (renewal fees accepted) | ||
RENW | Renewal (renewal fees accepted) | ||
RENW | Renewal (renewal fees accepted) |
Free format text: PATENT RENEWED FOR 7 YEARS UNTIL 22 AUG 2020 BY THOMSON REUTERS Effective date: 20130719 |
|
EXPY | Patent expired |