Real-time vibration testing method of wood during drying under high-temperature and high-humidity conditions
2004
Kubojima, Y. (Forestry and Forest Products Research Inst., Tsukuba, Ibaraki (Japan)) | Suzuki, Y. | Tonosaki, M.
We investigated ways of conducting vibration tests under high-temperature, high-humidity conditions. Sitka spruce (Picea sitchensis Carr.) specimens with dimensions of 110 mm (R)x 25 mm (L) x 8 mm (T) were used. The measuring apparatus were in an airtight chamber. Vibrational properties were measured by free-free flexural vibration test and changes in the output of the displacement sensor used for the vibration test were obtained under conditions of 115 deg C and 75 % relative humidity. Results were as follows: 1) Coating the displacement sensor with heat-resistant rubber and silicone increased its effective life. 2) Although the temperature, humidity and moisture content decreased when one displacement sensor was replaced with another one in the middle of drying, the temporal changes in the vibrational properties were not significantly affected. 3) Using coated displacement sensors with heat-resistant rubber and silicon and replacing a sensor with another one in the middle of drying were effective for obtaining vibrational properties under high-temperature, high-humidity conditions.
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