|
Abstract: Influence
on the natural vibrating frequencies of the boom is analyzed, which is
brought by rigid body and deformation coupling of the boom in a large
crane when luffing. Additional influence on natural frequencies of the
boom brought by mass of hook and pulley block is also taken into
account. Based on theory of flexible multi-body system, equation
describing vibration by the nominal motion is created by Lagrange
method. And it is uncoupled by state vector approach in complex modal
analysis. The results are three pairs of conjugate complex numbers and
smaller than those worked out by the structure dynamics method. And the
natural vibratioing frequencies are also influenced by rotary speed
surrounding the given point and mass of hook and pulley block, but the
effects are small.
Key words:Flexible
mechanics Complex frequencies Rigid body and deformation coupling
Lagrange’s equation State vector approach
CLC No: U661.44
国家建设部攻关资助项目(03-2-039).Received
20050931,received in revised form 20060407
|