Virtual Validation of BHL Dipper Using CAE and Correlation with Test Data 2020-01-0515
Use of Computer Aided Engineering (CAE) tools for virtual validation has become an essential part of every product development process. Using CAE tools, accurate prediction of potential failure locations is possible even before building the proto. This paper presents a detailed case study of virtual validation of Backhoe Loader (BHL) dipper arm using CAE tools (MBD: Multi Body Dynamics and FEA: Finite Element Analysis) and comparison of simulation results with test data.
In this paper, we have illustrated the modelling of Backhoe Loader in MSc ADAMS software. The detail ADAMS model was created and validated. The component mass, Center of Gravity (C.G) and Mass Moment of Inertia (MOI) was taken from CAD data. Trenching is simulated by operating the different hydraulic cylinders of the BHL. Loader arm cylinders and stabilizer cylinders are operated to lift the machine tires above the ground level. Boom, Dipper, Swing Arm and Bucket cylinders are operated to simulate the trenching operation. Theoretically calculated Bucket Break-out forces are applied on bucket tip during digging phase of trenching cycle. Hydraulic Cylinder pressure are monitored using ADAMS measures.
Loads exported from ADAMS simulation are used for NASTRAN inertia relief stress analysis. Strain gauge locations are identified on the Dipper arm using the stress tensor plots. BHL vehicle is instrumented to measure the strain and hydraulic cylinder pressure data. CAE results were compared with test data and found to be at acceptable level.