Arizona, cypress (Cupressus arizonica) wood extraction for a better acoustical performance
Soheila Zamaninasab 1 , amir lashgari 2 , Mehram Roohnia 3 , Ahmad Jahan-latibari 4 , Ajang Tajdini 5
1 - Ph.D. Student, Department of Wood and Paper Science and Technology, Karaj Branch, Islamic Azad University, Karaj, Iran
2 - گروه علوم و صنایع چوب و کاغذ، دانشگاه آزاد اسلامی واحد کرج، کرج، ایران.
3 - Professor, Department of Wood and Paper Science and Technology, Karaj Branch, Islamic Azad University, Karaj, Iran
4 - Professor, Department of Wood and Paper Science and Technology, Karaj Branch, Islamic Azad University, Karaj, Iran
5 - Associate Professor, Department of Wood and Paper Science and Technology, Karaj Branch, Islamic Azad University, Karaj, Iran
Keywords: Cypress wood, Sound, Vibration, Treatment, ACE,
Abstract :
In this research, the effect of soaking process and ethanol-acetone washing as well as fermentation pre-treatment by bread yeast in Cypress (Cupressus arizonica) has been investigated. The samples were subjected to pre-treatment with bread yeast and without pre-treatment, washing with pure water and removal of extractives in organic solvent and subjected to dynamic test by forced vibration test in free-free beam. Both methods of soaking process and ethanol-acetone washing resulted in a significant decrease in density and vibration damping, while the values of acoustic conversion efficiency showed an increase. The amount of improvement of acoustic properties due to ethanol-acetone washing was more than water washing. Fermentation pretreatment increased the changes in both water washing and ethanol-acetone washing methods. The dynamic modulus of elasticity did not show any significant change water washing, ethanol-acetone washing and fermentation pretreatment. In general, the ethanol-acetone washed samples under fermentation pretreatment left the highest acoustic indices.
