Tower Crane Based On Modal Analysis Of Structural Damage

Metal structure is major part of tower cranes, and fatigue fracture is themain form of metal structure failure. This paper aims to explore crack damagerecognition of tower crane metal structure. Connected to theory, it applies staticanalysis,dynamic analysis,nonlinear analysis and modal identification and soon. Finally it comes to conclusions as follows:First, take monotonous point tower crane for example and create its wholemodel with ANSYS Parametric Design Language (APDL). Tower crane staticanalysis could obtain information about strain stress and torque, which is thebasis of further research, and found general location of dangerous points. Thefirst ten order of natural frequency from dynamic analysis plays an import roleon crack failure recognition.The identification of metal structure cracks mainly solves two majorproblems: one is whether cracks exist, and the other is the location and size ofcracks. The article mainly employs the finite element modal analysis method toidentify metal structure cracks accurately. According to natural frequencyanalysis of structural model, establish a natural frequency database of metalstructure based on the model of metal structure cracks identification so thatwhen metal structure cracks exist, the four-wire high-intersecting crackidentification could find the location and size of cracks quantitatively. Finally,numerical simulations confirm the method effectiveness to a reliable basis formetal structure cracks identification.The identification of metal structure cracks mainly solves two majorproblems:one is the number of crack poles and the position of crack, and theother is the extent of damage. The article mainly employs the finite elementmodal analysis method to identify metal structure cracks accurately. Accordingto natural frequency analysis of structural model, establish a natural frequencydatabase of metal structure based on the model of metal structure cracksidentification so that when metal structure cracks exist, the four-wirehigh-intersecting crack identification could find the location and size of cracksquantitatively. Finally, numerical simulations confirm the method effectiveness to a reliable basis for metal structure cracks identification.