GB1244699A - Non-destructive method of grading wood materials - Google Patents

Non-destructive method of grading wood materials

Info

Publication number
GB1244699A
GB1244699A GB4268069A GB4268069A GB1244699A GB 1244699 A GB1244699 A GB 1244699A GB 4268069 A GB4268069 A GB 4268069A GB 4268069 A GB4268069 A GB 4268069A GB 1244699 A GB1244699 A GB 1244699A
Authority
GB
United Kingdom
Prior art keywords
specimen
sensors
wood
wave
timer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB4268069A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
University of Washington
Washington State University Research Foundation
Original Assignee
University of Washington
Washington State University Research Foundation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by University of Washington, Washington State University Research Foundation filed Critical University of Washington
Publication of GB1244699A publication Critical patent/GB1244699A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/04—Analysing solids
    • G01N29/045—Analysing solids by imparting shocks to the workpiece and detecting the vibrations or the acoustic waves caused by the shocks
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/023—Solids
    • G01N2291/0238—Wood
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/04—Wave modes and trajectories
    • G01N2291/042—Wave modes
    • G01N2291/0421—Longitudinal waves

Abstract

1,244,699. Acoustic inspection of wood. WASHINGTON STATE UNIVERSITY RESEARCH FOUNDATION. 27 Aug., 1969 [13 Sept., 1968], No. 42680/69. Heading H4D. A wood specimen is graded according to mechanical properties determined by impacting the specimen and timing the propagation of the resulting energy wave along at least a preselected portion of the specimen. As shown, a log, veneer or plank S is supported by a clamp 10, 14 and roller and is struck by hammer 11. The wave propagation time for the portion between sensors 16, 17 is determined by timer 18 and between sensors 21, 22 by timer 23. From these times, and the dimensions and density of the specimen, the wave velocity and dynamic modulus of elasticity (either for the portions separately or as an average over the whole specimen) may be computed in a memory circuit actuating a grade marker. Weak portions may be identified from their wave velocities. The sensors may be of the contact-type (e.g. accelerometers) or non-contact type (e.g. shrouded conductors for detecting charges generated by the piezoelectric effect in wood).
GB4268069A 1968-09-13 1969-08-27 Non-destructive method of grading wood materials Expired GB1244699A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US75954268A 1968-09-13 1968-09-13

Publications (1)

Publication Number Publication Date
GB1244699A true GB1244699A (en) 1971-09-02

Family

ID=25056047

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4268069A Expired GB1244699A (en) 1968-09-13 1969-08-27 Non-destructive method of grading wood materials

Country Status (3)

Country Link
CA (1) CA918286A (en)
GB (1) GB1244699A (en)
SE (1) SE348558B (en)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2160320A (en) * 1984-06-12 1985-12-18 Tampella Oy Ab Optimizing percussive drilling
EP0306110A2 (en) * 1987-09-04 1989-03-08 Micro Motion Incorporated Method for manufacture of a coriolis flow meter
EP0403020A2 (en) * 1989-06-12 1990-12-19 Washington State University Research Foundation Non-destructive evaluation of structural members
WO1998001737A1 (en) * 1996-06-17 1998-01-15 Dynalyse Ab Method and arrangement for nondestructive classification
WO1999044059A1 (en) * 1998-02-25 1999-09-02 Weyerhaeuser Company Log cutting optimization system
WO2000036413A1 (en) * 1998-12-17 2000-06-22 Carter Holt Harvey Limited Log cutting procedures
US6598477B2 (en) 2001-10-31 2003-07-29 Weyerhaeuser Company Method of evaluating logs to predict warp propensity of lumber sawn from the logs
EP1384192A2 (en) * 2001-01-31 2004-01-28 Board of Control of Michigan Technological University System for and method of performing evaluation techniques on a log or round timber
US6769306B2 (en) 1998-12-17 2004-08-03 Carter Holt Harvey Limited Log cutting procedures
AU780469B2 (en) * 1998-02-25 2005-03-24 Weyerhaeuser Company Unfinished wood product cutting optimization system
US6889551B2 (en) * 2000-04-12 2005-05-10 Carter Holt Harvey Limited Method of estimating timber stiffness profiles
DE10356383A1 (en) * 2003-12-03 2005-06-30 Abb Patent Gmbh Mass flow meter
WO2007011296A1 (en) * 2005-07-15 2007-01-25 A-Sort Ab Means and method for classifying logs
FR2967492A1 (en) * 2010-11-17 2012-05-18 Innodura METHOD AND DEVICE FOR NON-DESTRUCTIVE DETERMINATION OF THE RUPTURE MODULUS OF A WOODEN PART
RU2627852C2 (en) * 2015-10-15 2017-08-14 федеральное государственное бюджетное образовательное учреждение высшего образования "Московский государственный технический университет имени Н.Э. Баумана (национальный исследовательский университет)" (МГТУ им. Н.Э. Баумана) Visualization and quantification technique of wood and timber-based materials shape memory effect

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4838085A (en) * 1986-03-25 1989-06-13 Washington State University Research Foundation, Inc. Methods and appartaus for non-destructing evaluation of the mechanical properties of composite materials
US6053052A (en) * 1995-11-16 2000-04-25 Timberco, Inc. Panel performance test system
US5699274A (en) * 1995-11-16 1997-12-16 Timberco, Inc. Panel performance test system

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2160320A (en) * 1984-06-12 1985-12-18 Tampella Oy Ab Optimizing percussive drilling
EP0306110A2 (en) * 1987-09-04 1989-03-08 Micro Motion Incorporated Method for manufacture of a coriolis flow meter
EP0306110A3 (en) * 1987-09-04 1990-06-13 Micro Motion Incorporated Method and apparatus for determining elastic constants in tubes
EP0403020A2 (en) * 1989-06-12 1990-12-19 Washington State University Research Foundation Non-destructive evaluation of structural members
EP0403020A3 (en) * 1989-06-12 1991-08-14 Washington State University Research Foundation Non-destructive evaluation of structural members
WO1998001737A1 (en) * 1996-06-17 1998-01-15 Dynalyse Ab Method and arrangement for nondestructive classification
AU720772B2 (en) * 1996-06-17 2000-06-08 Dynalyse Ab Method and arrangement for nondestructive classification
US6347542B1 (en) 1996-06-17 2002-02-19 Dynalyze Ab Method and arrangement for non-destructive determination of the properties of an object
WO1999044059A1 (en) * 1998-02-25 1999-09-02 Weyerhaeuser Company Log cutting optimization system
AU780469B2 (en) * 1998-02-25 2005-03-24 Weyerhaeuser Company Unfinished wood product cutting optimization system
US6769306B2 (en) 1998-12-17 2004-08-03 Carter Holt Harvey Limited Log cutting procedures
WO2000036413A1 (en) * 1998-12-17 2000-06-22 Carter Holt Harvey Limited Log cutting procedures
US6889551B2 (en) * 2000-04-12 2005-05-10 Carter Holt Harvey Limited Method of estimating timber stiffness profiles
US7043990B2 (en) * 2001-01-31 2006-05-16 Board Of Control Of Michigan Technological University System for and method of performing evaluation techniques on a log or round timber
EP1384192A4 (en) * 2001-01-31 2005-08-03 Univ Michigan Tech System for and method of performing evaluation techniques on a log or round timber
EP1384192A2 (en) * 2001-01-31 2004-01-28 Board of Control of Michigan Technological University System for and method of performing evaluation techniques on a log or round timber
US6598477B2 (en) 2001-10-31 2003-07-29 Weyerhaeuser Company Method of evaluating logs to predict warp propensity of lumber sawn from the logs
AU2002301330B2 (en) * 2001-10-31 2007-08-23 Weyerhaeuser Company Method of evaluating logs to predict wrap propensity of lumber sawn from logs
DE10356383A1 (en) * 2003-12-03 2005-06-30 Abb Patent Gmbh Mass flow meter
DE10356383B4 (en) * 2003-12-03 2007-06-21 Abb Patent Gmbh Mass flow meter
WO2007011296A1 (en) * 2005-07-15 2007-01-25 A-Sort Ab Means and method for classifying logs
EA011414B1 (en) * 2005-07-15 2009-02-27 А-Сорт Аб Means and method for classifying logs
FR2967492A1 (en) * 2010-11-17 2012-05-18 Innodura METHOD AND DEVICE FOR NON-DESTRUCTIVE DETERMINATION OF THE RUPTURE MODULUS OF A WOODEN PART
EP2455740A1 (en) * 2010-11-17 2012-05-23 Innodura Method and device for non-destructive determination of the modulus of rupture of a wooden part
RU2627852C2 (en) * 2015-10-15 2017-08-14 федеральное государственное бюджетное образовательное учреждение высшего образования "Московский государственный технический университет имени Н.Э. Баумана (национальный исследовательский университет)" (МГТУ им. Н.Э. Баумана) Visualization and quantification technique of wood and timber-based materials shape memory effect

Also Published As

Publication number Publication date
SE348558B (en) 1972-09-04
CA918286A (en) 1973-01-02

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