Development And Application Of Automatic Multi-posture Analysis Module For Boom Of Truck Mounted Concrete Pump Based On Patran

Truck mounted concrete pump is one of the most widely used large construction machineries in engineering construction field, which is of high technical content and high maintenance cost. It often breaks down when in use due to working intensity and environmental factors. In order to investigate working characteristics of boom in various postures, thus to promote structural optimization and improve working performance, an automatic multi-posture analysis module of boom of truck mounted concrete pump was developed based on Patran, and the booms’static and dynamic characteristics in different postures were studied in this paper.Firstly, model simplification principle for booms were established according to their structural characteristics, and finite element models of a test boom and the boom of a37m truck mounted concrete pump were built respectively; posture transformation of boom was realized by means of rotation; pin connections were simulated with multiple-point constraints RBE2and RJOINT; equivalent model of hydraulic cylinders in finite element analysis was established and their equivalent stiffness and density formulae were derived; a boom analysis module which has functions of automatic posture transformation, loads parameterization and static/modal batch analysis was developed based on Patran. It has friendly graphic user interface and could greatly enhance finite element analysis efficiency of the booms in various postures.Secondly, the test boom’s static stresses and modals in four typical postures were analyzed with the developed automatic analysis module and were tested respectively. Then the analytical results were compared with the test results, which verified accuracy of the analysis module for both static and modal analyses.Lastly, static stresses and modals of boom of the37m truck mounted concrete pump in postures of "horizontal" and "floor" were analyzed with the developed automatic analysis module, and the static analysis results were compared with test data, which verified the reliability of the model and analyses. The results can provide support and guidance for sensor arrangement, structural optimization and vibration reduction of booms.