Virkets formförändring och dess betydelse vid postning
The purpose of this thesis was to create a saw pattern program for the sawmill industry. I have chosen to focus on the module that describes the shrinking on the wood. There are several theories about how the wood deforms by shrinking. Several hypotheses were simulated in the program and after testi...
| Autor principal: | |
|---|---|
| Formato: | L3 |
| Lenguaje: | sueco Inglés |
| Publicado: |
SLU/Dept. of Forest Products
2003
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| Materias: |
| _version_ | 1855571865371672576 |
|---|---|
| author | Nordin, Henrik |
| author_browse | Nordin, Henrik |
| author_facet | Nordin, Henrik |
| author_sort | Nordin, Henrik |
| collection | Epsilon Archive for Student Projects |
| description | The purpose of this thesis was to create a saw pattern program for the sawmill industry. I have chosen to focus on the module that describes the shrinking on the wood. There are several theories about how the wood deforms by shrinking. Several hypotheses were simulated in the program and after testing them I decided to use only one of them (hypothesis C).
The program is written in Visual Basic .NET and I choused that program language because it
is easy to do changes in the layout. Another great advantage in Visual .Net is that you can mix different languages in the same program. For example you can use one language for
calculating a motion and another one for the design.
With the program you can simulate the shrinking of a plank when it's drying. The result is a picture of the plank with its new width and thickness.
The program has one disadvantage, which occurs when a plank is placed in the middle of the
log, the forces in the plank are then different and the hypothesis doesn't work for those cases.
The final part of the work was to make a sketch of how a saw pattern model should look like with the shrinking module. |
| format | L3 |
| id | RepoSLU11397 |
| institution | Swedish University of Agricultural Sciences |
| language | swe Inglés |
| publishDate | 2003 |
| publishDateSort | 2003 |
| publisher | SLU/Dept. of Forest Products |
| publisherStr | SLU/Dept. of Forest Products |
| record_format | eprints |
| spelling | RepoSLU113972017-10-06T08:29:29Z Virkets formförändring och dess betydelse vid postning Nordin, Henrik virke formförändring postning The purpose of this thesis was to create a saw pattern program for the sawmill industry. I have chosen to focus on the module that describes the shrinking on the wood. There are several theories about how the wood deforms by shrinking. Several hypotheses were simulated in the program and after testing them I decided to use only one of them (hypothesis C). The program is written in Visual Basic .NET and I choused that program language because it is easy to do changes in the layout. Another great advantage in Visual .Net is that you can mix different languages in the same program. For example you can use one language for calculating a motion and another one for the design. With the program you can simulate the shrinking of a plank when it's drying. The result is a picture of the plank with its new width and thickness. The program has one disadvantage, which occurs when a plank is placed in the middle of the log, the forces in the plank are then different and the hypothesis doesn't work for those cases. The final part of the work was to make a sketch of how a saw pattern model should look like with the shrinking module. Syftet med examensarbetet var att skapa en postningsmodell för sågverk, denna skulle kunna utvecklas till ett färdigt program för kommersiellt bruk. Tyngdpunkten har lagts på att konstruera den modul som beskriver träets krympning. Programutvecklingen försvårades av att det finns flera teorier om hur träet krymper. För att hitta rätt teori provades olika hypoteser innan den slutgiltiga hypotesen valdes. Jag valde programmeringsspråket Visual Basic.NET eftersom utseendet på mitt program skulle vara lätt att ändra under dess utveckling. Visual Basic .NET är lätt att ändra eftersom knappar och menyer ritas i en editor istället för att skrivas i text. Det utvecklade programmet kan köras i Pc-miljö och simulerar träets krympning vid torkning och visar hur den valda brädan förändrar utseende. Programmet har en svaghet, vid simulering av märgbitar ger den inte ett korrekt resultat på grund av plasticiteten i träet. En utveckling av programmet skulle vara att implementera en metod som kallas Finita Element Metoden. Arbetet har avslutats med att ta fram en fullständig modell av ett postningsprogram där krympningsmodellen ingår. SLU/Dept. of Forest Products 2003 L3 swe eng https://stud.epsilon.slu.se/11397/ |
| spellingShingle | virke formförändring postning Nordin, Henrik Virkets formförändring och dess betydelse vid postning |
| title | Virkets formförändring och dess betydelse vid postning |
| title_full | Virkets formförändring och dess betydelse vid postning |
| title_fullStr | Virkets formförändring och dess betydelse vid postning |
| title_full_unstemmed | Virkets formförändring och dess betydelse vid postning |
| title_short | Virkets formförändring och dess betydelse vid postning |
| title_sort | virkets formförändring och dess betydelse vid postning |
| topic | virke formförändring postning |