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Graphical pre- and post-processing for a two-dimensional boundary element code, including automatic mesh generation
Published in W.A. Hustrulid, G.A. Johnson, Rock Mechanics Contributions and Challenges: Proceedings of the 31st U.S. Symposium, 2020
J.M. Crotty Sisson, R.H. MacKinnon, A.N. Stokes
The purpose of this paper is to report on work in progress to develop IBM-compatible PC-based pre- and post-processing programs for BITEMJ (Crotty and Wardle 1985), a boundary element stress analysis code which is widely used for underground opening design (Coulthard et al. 1983, Wold and Pala 1986, Lee et al. 1988). The philosophy behind the work has been three-fold; to provide a friendly user interface, where possible to use software which is available commercially, and to keep the programs portable and demanding the minimum in computer power. In the following pages, the stress analysis code is described briefly. The pre-processor, which consists of a third party CAD (computer aided design) drawing package, an automatic mesh generator and an interactive display program, is detailed, followed by discussion of the post-processor. Problems of computer programming and code portability are touched upon. A mining case study, illustrating the capabilities of the combined system (Figure 1), is presented.
Finite Element Analysis
Published in G. Ravichandran, Finite Element Analysis of Weld Thermal Cycles Using ANSYS, 2020
ANSYS is a general purpose finite element software which can be successfully employed for the transient thermal analysis of welding problems. The software consists of three modules such as preprocessor, solution, and post-processor. In the preprocessor module, the element type and the material properties are selected and the meshing of the domain of interest is carried out. In the solution module, the time interval for transient analysis, the convection heat loss and arc heat input are entered and the problem is solved for a given time step. If the analysis is of transient type, then the analysis is repeated for different time steps. In the post-processor module, the temperature results for various sets can be viewed. In addition, the animation feature enables one to visually picturize the flow of heat in the domain of interest.
Computer Aided 5-Axis Machining
Published in Cornelius Leondes, Computer-Aided Design, Engineering, and Manufacturing, 2019
Andrew Warkentin, Paul Hoskins, Fathy Ismail, Sanjeev Bedi
Cutter location data will be converted to G-code by the post-processor once the tool length is known. A G-code position command sent to the 5-axis machine controller will consist of X,Y,Z,A, and C components used to command the ioints. The wrist is translated by the X,Y,Z, position command relative to the programmed coordinate system and the tool is rotated about the wrist by the A and C commands. These commands are converted to the machine coordinate system by the CNC controller.
Generating direct diamond shaping tool paths using special-purpose computer-aided-machining post-processor
Published in International Journal of Computer Integrated Manufacturing, 2022
Darren Wei Wen Low, Nicholas Yew Jin Tan, Dennis Neo Wee Keong, A. Senthil Kumar
In conventional CAM processes, a post processor is used to convert the CAM generated tool path into specific machine-readable NC codes. Post processors are therefore usually specific to the company that developed the Computer Numerical Control (CNC) machine. Their purpose is essential in linking the CAM output with production equipment. The use of post processors to drastically transform tool paths is not unheard of. Notably, Lee and She (1997) developed a post-processor capable of generating 5-axis tool paths for varying setups. This was done by finding the analytical equations that convert cutter location information to the chosen 5-axis machine setups.