Original Date: 11/13/1995
Revision Date: 01/18/2007
Best Practice : IPD/Three-Dimensional Solid Modeling
JLG Industries, Inc. has developed its computer-aided design solid modeling capabilities by using software programs to evaluate designs prior to physical prototyping. Previously, JLG developed the design in two dimensions and verified the strength of structural components and machine stability by hand. Changes were then made based on those hand calculations. Prototype testing was performed in strain measurement, pressure measurement, and cycle test. If any test result was unacceptable, modifications were made on the prototype. Only then was the design approved for production.
Three-dimensional models are now entered in a database to allow analysis of any part or assembly without recreating a particular view. Properties of the model are analyzed with Pro/Engineer, Pro/Mechanica, Patran/Nastran, and ADAMS software. The Pro/Engineer software allows three-dimensional modeling, tolerance checks, and assembly interference review whereas Pro/Mechanica and Patran/Nastran allow finite element analysis, among other capabilities. ADAMS provides for dynamic load prediction and dynamic stability analysis. Loads at different pin joints, tire forces, and other dynamic forces at the joints due to steering, oscillating axle, rough terrain, and boom deployment can be performed on the machines. Pro/Mechanica and Patran/Nastran software facilitate insight into the structural integrity of beams, shells, solids, and associated buckling. Pro/Mechanica and Patran/Nastran software both allow analysis of critical structural members of the machine.
With this engineering approach, stress, failure analysis, and machine stability can be observed prior to building the prototype, thereby eliminating expensive delays. Additional benefits include observing the computer-displayed ergonomics and basket movement effects in the design phase. JLG Industries, Inc. has seen a reduction in the number of prototypes, less time to market with a new product, reduced testing time, and delivery of more reliable products to the customer.
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