Virtual Validation of BHL Dipper using CAE tools and correlation with Test 2020-01-0515
Use of 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 (Multi Body Dynamics: MBD and Finite Element Analysis: FEA) and comparison of simulation results with test data.
In this paper, we have illustrated the MBD modelling of BHL in ADAMS. The detail MBD model was created and validated. The component mass, CG and 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 MBD 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 (correlation 76%).