Integrated Module for Mobile Crane Dynamic Instability Analysis and Supporting System Design

Abstract

Stability is an important safety issues related to the use of mobile cranes. Dynamic loading related to crane motion and load are the key factors associated with the failure to maintain stability. In this regard, the dynamic nature of mobile crane operations entails a variety of outrigger reaction values for truck cranes and track pressure values for crawler cranes. Crane supporting reaction or pressure is a function of the lifting configuration, crane geometry, and the crane component’s weight; in most situations, such information is not readily available. Moreover, this paper presents an algorithm which is designed to assist practitioners in evaluating the elements required for calculating the reaction forces for both types of mobile cranes—truck cranes on outriggers and crawler cranes on tracks—and checking the stability of the crane. The developed algorithm integrates a reaction influence chart, which accounts for the dynamic relationship between the reaction of the outriggers or pressure of the crawler tracks and the boom’s horizontal swinging and vertical angles. The developed algorithm is also integrated with a previously developed crane selection system and a database. Finally, a case example is described in order to demonstrate the use of the presented algorithm. The proposed system has proven to be effective in reducing the time and cost associated with the preparation of lift studies.