Chełmecki Jarosław, Szeptyński Paweł, Jasińska Dorota, Kwiecień Arkadiusz
Deformations and Vibrations of Structures Laboratory, Cracow University of Technology, 31-155 Kraków, Poland.
Division of Structural Mechanics and Material Mechanics, Faculty of Civil Engineering, Cracow University of Technology, 31-155 Kraków, Poland.
Materials (Basel). 2024 Dec 29;18(1):93. doi: 10.3390/ma18010093.
In this study, we investigated the vibration of adhesively bonded composite cantilevers consisting of two beech wood lamella and a bondline of flexible polyurethane. The beams had a constant total height, while the thickness of the adhesive layer varied. We analyzed both the driven and free vibration of a single cantilever beam and a cantilever with an additional mass attached to its end. The eigenfrequencies were determined using Fourier analysis of a sweep load response, the response to an impact load excited using an impact hammer, and the response observed via the manual displacement of the beam's tip. The system's damping was estimated according to the recorded logarithmic decrement. Theoretical estimates of the fundamental natural frequency were obtained using the γ-method and employing a linear elastic theory of composite beams. A numerical modal analysis was carried out using the finite element method. Upon comparing the results of our experiments with the numerical estimates and theoretical predictions, a fair agreement was found.
在本研究中，我们研究了由两片山毛榉木薄片和一层柔性聚氨酯粘结层组成的粘结复合悬臂梁的振动情况。这些梁的总高度恒定，而粘结层的厚度有所变化。我们分析了单个悬臂梁以及末端附加有额外质量块的悬臂梁的受迫振动和自由振动。通过对扫频载荷响应进行傅里叶分析、对用冲击锤激发的冲击载荷响应以及通过手动位移梁的末端所观察到的响应来确定固有频率。根据记录的对数衰减来估计系统的阻尼。使用γ方法并采用复合梁的线性弹性理论获得了基本固有频率的理论估计值。使用有限元方法进行了数值模态分析。将我们的实验结果与数值估计和理论预测进行比较后，发现了较好的一致性。
