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Active Control of Beams and Plates Using Spatially Distributed Transducers
Hubbard, Jr.,James E. 대한기계학회 1993 Korea - U. S. Vibration Engineering Seminar Vol.1 No.1
The application of distributed transducers to the active vibration control of beams and plates is investigated for general boundary conditions and non-uniform spatial distributions. An energy based analysis of distributed transducer design issues related to observation and control is presented. The analysis exploits mode symmetry and boundary integral representations of key parameters to choose appropriate spatial weightings for distributed sensors and actuators. The energy based approach also offers the possibility of formulating control laws without the necessity of modeling the plant in terms of its component vibrational modes. Experimental examples and results are presented.
Crystallization of Precursors to Forsterite and Chromium-Doped Forsterite
Park, Dong Gon Martin, M. Hogan E. Ober, Christopher K. Burlitch, James M. Cavin, O. Burl Porter, Wallace D. Hubbard, Camden R. 숙명여자대학교 자연과학연구소 1994 자연과학논문집 Vol.- No.5
The pyrolysis and crystallization of poly(mathacrylate) precursors and xerogels of forsterite and chromiumdoped forsterite were studied by in situ high-temperature, dynamic X-ray diffraction and thermal analysis. For both types of precursor, crystallization of forsterite occurred at lower temperature when doped with chromium. Also, exotherms above 700℃ occurred 50℃ lower when chromium was present. When residual carbon in the xerogels was more than ∼1%, an unidentified crystalline intermediate phase formed at ∼800℃. Conversion of the intermediate phase to forsterite was faster than amorphous material. Thus, full crystallinity was attained at a lower temperature when the xerogels had some residual carbon.
Crystallization of Precursors to Forsterite and Chromium-Doped Forsterite
Park, Dong Gon,Martin, M. Hogan E.,Ober, Christopher K.,Burlitch, James M.,Cavin, O. Burl,Porter, Wallace D.,Hubbard, Camden R. 숙명여자대학교 자연과학연구소 1994 자연과학논문집 Vol.- No.5
The pyrolysis and crystallization of poly(mathacrylate) precursors and xerogels of forsterite and chromiumdoped forsterite were studied by in situ high-temperature, dynamic X-ray diffraction and thermal analysis. For both types of precursor, crystallization of forsterite occurred at lower temperature when doped with chromium. Also, exotherms above 700℃ occurred 50℃ lower when chromium was present. When residual carbon in the xerogels was more than ∼1%, an unidentified crystalline intermediate phase formed at ∼800℃. Conversion of the intermediate phase to forsterite was faster than amorphous material. Thus, full crystallinity was attained at a lower temperature when the xerogels had some residual carbon.