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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
21

Computer simulation of plywood manufacturing using the GASP IV language /

Ulrich, Thierry Olivier P. January 1982 (has links)
Thesis (M.S.)--Oregon State University, 1983. / Typescript (photocopy). Includes bibliographical references (leaves 120-123). Also available on the World Wide Web.
22

Investigation and Prediction of the Sound Transmission Loss of Plywood Constructions

Wareing, Robin Richard January 2015 (has links)
The sound transmission loss of a range of plywood panels was measured to investigate the influence of the orthotropic stiffness of the plywood panels. The plywood panels were tested as single and also double leaf partitions, with a range of stud configurations. A new method was developed for predicting the sound transmission loss of single leaf partitions with both orthotropic and frequency dependent stiffness values. The sound transmission loss was evaluated for two significantly different sample sizes. The observed influence of the sample size on the measured sound transmission loss was profound. The construction of the partition was shown to significantly affect the influence of the sample size on the sound transmission loss. A qualitative analysis based on existing published research of the contributing factors is presented, and methods for adjusting the results for the small sample size for comparison with the large results were developed. The influence of a range of acoustic treatments of lightweight plywood partitions was investigated. The treatments involved internal viscoelastic materials and decoupled mass loaded barriers in various arrangements. The attachment between the treatment and the plywood panel was found to influence the sound transmission loss significantly. A prediction method based on published models was modified to allow the influence of the treatments to be included. Reasonable agreement was achieved between the predicted and measured results for a wide range of samples. A prediction method was developed that accounts for the influence of orthotropic, frequency dependent material parameters. This method utilised an adaptive, numerical integration method to solve an analytical formulation for the sound transmission loss. The influence of the finite sample size was accounted for using an expression for the finite panel radiation impedance. The finite panel radiation impedance was predicted analytically and an approximation was also presented. The presence of a significant source room niche was accounted for by applying an appropriate limit to the integration range of the angle of incidence. The prediction methods developed are compared with the measured transmission loss results from both the small and large test facilities. Good agreement was seen for some of the predicted results. Generally the agreement within the coincidence region was worse than for the rest of the transmission loss curve. The inclusion of orthotropic and frequency dependent stiffness values significantly improved the agreement within the coincidence region.
23

The use of plywood in airplane wing beams

Heck, George Emil. January 1925 (has links)
Thesis (M.S.)--University of Wisconsin, 1925. / eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.
24

Radiant smoldering ignition of plywood

Gratkowski, Mark T. January 2004 (has links)
Thesis (M.S.)--Worcester Polytechnic Institute. / Keywords: self-heating; smoldering ignition; plywood; bowes. Includes bibliographical references.
25

Development and structural testing of frp reinforced OSB panels FOR disaster resistant construction /

Cassidy, Eric Dana, January 2002 (has links) (PDF)
Thesis (M.S.) in Civil Engineering--University of Maine, 2002. / Includes vita. Includes bibliographical references (leaves 136-141).
26

Determination of the design strength of thin structural veneer cladding panels /

Winter, Gerrard Martin. January 2002 (has links) (PDF)
Thesis (Ph.D.) - University of Queensland, 2002. / Includes bibliography.
27

Development and characterization of new formaldehyde-free soy flour-based adhesives for making interior plywood /

Huang, Jian. January 1900 (has links)
Thesis (M.S.)--Oregon State University, 2007. / Printout. Includes bibliographical references (leaves 85-91). Also available on the World Wide Web.
28

Sales forecasting in the plywood industry

Clark, Ronald Nicholson January 1964 (has links)
This thesis presents a general review of sales forecasting literature with particular attention to the preparation of the sales forecast, the pre-planning activities and the review. In addition, forecasts are developed which show the expected sales of domestic softwood plywood to be realized by the plywood industry for the years 1964 and 1968. A procedure is then presented that Crown Zellerbach Company can follow in using the industry forecast to ascertain their share of the expected softwood plywood sales. Sales forecasting is an essential prerequisite to company planning. Therefore, forecasts must be as accurate as possible because many activities within the firm are based on the sales forecasts. With the assistance of sales forecasts, vital marketing, financial and production plans ultimately emerge, together with their supporting schedules. The person responsible for the forecasting task must acquire not only a detailed understanding of company activities but also a thorough knowledge of the characteristics of a sound forecasting operation. The forecaster must be familiar with the various judgment, survey and statistical techniques available for developing forecasts and he must understand the necessity of carrying out numerous pre-performance and post-performance activities. The pre-performance activities must be dutifully carried out if the most useful forecasting method is to be chosen. Post-performance activities are equally important. A time-table for review and revision when necessary must be drawn up ahead of time if proper control is to be exercised over the forecast. A simple regression equation and three multiple regression equations are developed with the intention of using one or more of them to forecast industry softwood plywood sales for the years 1964 and 1968. The three multiple linear regression equations are rejected because each of them possesses one or more unacceptable negative constants. The simple linear regression equation has an extremely high coefficient of correlation and a small standard error of estimate. Since this equation contains these desirable features and seems to incorporate no underlying fallacy, this simple regression equation is the one chosen to forecast industry plywood sales. The share-of-market approach is used to determine the proportion of the industry sales to be captured by Crown Zellerbach Company. The total projected industry sales figures are multiplied by a percentage which represents the company's present share of the total market. The figures that result represent the anticipated plywood sales to be achieved by Crown Zellerbach Company for the years 1964 and 1968. Crown Zellerbach should not depend solely on the technique developed in this thesis for forecasting plywood sales. They should continue to use the subjective or judgment technique that they have used for a number of years, but they would follow a better course if they used one or more statistical or survey methods in addition to the present method. A final forecast could be selected after an analysis had been made of the forecasted figures developed by the various methods. / Business, Sauder School of / Marketing, Division of / Graduate
29

An automatic method for inspecting plywood shear samples

Avent, R. Richard 30 December 2008 (has links)
Plywood is composed of several thin layers of wood bonded together by glue. The adhesive integrity of the glue formulation employed must surpass the structural integrity of the wood species within a given panel of plywood. The American Plywood Association (APA) regularly tests the plywood produced at various plywood manufacturing plants to ensure that this particular performance requirement is consistently met. One of the procedures used by the APA to test this requirement consists of 1) milling a plywood panel to be tested into small rectangular blocks called samples, 2) conditioning these samples with various treatments to simulate natural aging, 3) shearing each sample into two halves, and 4) estimating the percent wood failure (as opposed to glue failure) produced by the shear by visually inspecting these sample halves. A region of solid wood or a region of wood fibers embedded in glue on the shear of a sample half is a region of wood failure while a region of glue is a region of glue failure. If the wood failure of samples from a significant number of panels is too low, the right to use APA trademarks is withdrawn from the plant where the sampling occurred. Since measurements obtained by human visual inspection can contain inaccuracies due to fatigue, boredom, state of mind, etc., an automatic vision system to determine percent wood failure is proposed. The method presented is a refinement of the method developed by McMillin and is divided into three tasks. The first task is to locate the area of shear on a given sample half. The second task is to distinguish the areas of wood from the areas of glue on the shear of a sample half. Solid wood is distinguished from glue based on the difference in gray level intensity that exists between solid wood and glue. Wood fiber is distinguished from glue based on the difference in texture, i.e., edge patterns, that exists between fiber and glue. The third task is to compare the areas of shear on the two sample halves comprising a sample to determine the percent wood failure of the sample. / Master of Science
30

Evaluation of the durability of mass timber products against termites (Reticulitermes spp.) using choice testing.

McGinnis, Jazmine A 01 May 2020 (has links)
Mass timber products are rapidly growing in fascination and popularity across the North American construction market, in which wood products are tested for durability and resiliency according to standards set by the American Wood Protection Association. Presently, the American Wood Protection Association (AWPA) E1 Standard calls for a test sample size of 2.54cm x 2.54cm x 0.64cm, which may be too small to encompass the large spacing between the bond lines of CLT, a multilayered mass timber product composed of layers of kiln-dried lumber alternating in grain direction. The objective of this study was to evaluate the resistance of untreated CLT against subterranean termites (Reticulitermes spp.) found in the southeastern United States using two-sample choice testing and extend the AWPA E1-17 Standard to accommodate the larger building material. Choice-testing methods were evaluated over a 4-week period for mass loss, visual rating, mold formation, and termite mortality.

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