【摘要】 等强度梁在工程上应用广泛，探讨其振动特性具有重要意义。由于等强度梁的变截面特性，无法求解振动频率和模态的精确解。采用假设模态法、有限元仿真和实验测试的方法，求解了等强度悬臂梁弯曲振动特性，并对3种方法和结果进行了对比，研究表明等强度梁振动模态与等截面悬臂梁模态形状一致。更多还原

【Abstract】 Equal strength beams are widely used in engineering structures, so it is an important to study their vibration characteristics. However, the exact values of frequencies and mode shapes can not be derived due to the un-uniform property of cross-sections of the beam. By using the assumed-mode method, the finite element method and the experimental method respectively, the bending vibration characteristics of an equal strength beam are analyzed. Three different methods are compared. Results show that the vibration modeof equal strength beams conforms withthat of cross-sectionscantilever beam.更多还原