【摘要】 探讨了弯扭组合振动分解为弯曲和扭转振动的应变导纳测定方法。应用第 1阶固有频率的横向和纵向应变导纳的线性谱幅值测定了杆材的泊松比 ,并与静态测量结果作了比较。通过应变导纳位相 ,分析了弯扭杆件材料的扭振阻尼是大于弯曲振动的阻尼。作为本例 ,弯扭组合时的动应力约是静应力的 5倍更多还原

【Abstract】 For member composed of bending and torsion, a method for measuring strain mobility has been investigated by decomposing for bending and torsion. By amplitude of liner spectrum of strain mobility at basic frequency (stage Ⅰ nature frequence), poisson′s ratio of material of member has been measured, and compared with static result. Applying phase of strain mobility, damping of torsion vibration is bigger than lateral vibration. For example, dynamic stress composed of bending and torsion is about 5 times of static stress.更多还原