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Role of discontinuity on stress field in wall-control blasting
Published in B. Mohanty, Rock Fragmentation by Blasting, 2020
In this analysis, a finite element program (I-DEAS) has been used to analyze the stress distributions in the regions of interest. I-DEAS is an integrated software tool which has been developed by Structural Dynamic Research Corporation, SDRC (Lawry, 1991; I-DEAS, 1990). A complete finite element model can be built by I-DEAS, including physical and material properties, loads and boundary conditions. The finite element analysis consists of three steps: preprocessing, solution and postprocessing.
Construction of Finite Element Models on the Basis of Computed Tomography Data
Published in J. Middleton, M. L. Jones, G. N. Pande, Computer Methods in Biomechanics & Biomedical Engineering – 2, 2020
G. Kullmer, J. Weiser, H. A. Richard
For the FE-mesh generation of parts of the human musculoskeletal two methods have been proposed. A geometry based method (FAMGoFEG) and a voxel based method (FAMVoFEG). For the application of FAMGoFEG the contours of the parts are extracted from CT-scans. FAMGoFEG utilizes the commercial software package I-DEAS Master Series for the construction of the CAD-model from the part contours and the meshing of the parts. For the application of FAMVoFEG self made software tools have been generated. With this method finite elements are created directly from voxel extracted from CT-scans. To improve the shape adaptation the surface nodes are pushed onto the underlying voxel structure. The comparison between the two methods shows that at present it cannot be stated which method overrides the other. Both methods have specific advantages and disadvantages. So it depends on the respective application which method should be preferred. Furthermore one of our aims is the improvement of the applicability of both methods to develop an almost automatic mesh generator that involves the advantages of both proposed methods. With such a tool one of our main goals the rapid production of individually adapted and optimized healing aids may be reached.
Optimum Design
Published in William H. Middendorf, Richard H. Engelmann, Design of Devices and Systems, 2017
William H. Middendorf, Richard H. Engelmann
In Section 11.6, we looked briefly at one comprehensive CAE system, the IDEAS™ system marketed by Structural Research Dynamics Corporation (SDRC™), and listed a number of programs available in that system. One that was omitted from that list was their I-DEAS Optimization software. This program allows the designer to use analysis results to directly drive design improvements, using finite-element analysis to simulate structural performance. “Performance” as used here may be any one of a number of measures related to the part in question, such as mass, stress, displacement under load, natural frequency of vibration, and so forth. The user defines the necessary information, as follows:
Thermal analysis model correction method based on Latin hypercube sampling and coordinate rotation method
Published in Journal of Thermal Stresses, 2023
Shijun Li, Liheng Chen, Shuai Liu
For the thermal analysis model correction (Figure 5), key thermal design parameters are as much as possible selected first. The thermal design parameters are sampled next using LHS; the sampling results are then inputted to the I-deas/TMG software for thermal simulation calculations. Next, depending on the results of the thermal simulation, the thermal design parameters are classified as either global sensitive parameters, local sensitive parameters or insensitive parameters using the Spearman rank correlation coefficient formula. Global-sensitive and local-sensitive parameters are mainly corrected, whereas those parameters with almost no influence are left untouched. Finally, according to this layered correction idea, the CRM is used to correct the global and local sensitive parameters, and combinations of them are constantly iterated until the iterative error of the objective function is satisfied and an optimal solution obtains.
An approach to evaluate CAM software alternatives
Published in International Journal of Computer Integrated Manufacturing, 2020
Above, in Section 3, a fuzzy AHP approach has been proposed for a CAM software selection problem. In this section, a case study is presented to prove the applicability and validity of the proposed approach. The case study is applied for a cutting tool manufacturer, a leading company in designing and manufacturing of all kinds of cutting tools (i.e. twist drills, reamers, taps, nuts, carbide-tipped tool holders, center drills, masonry drills). Because the company management decided to implement a CAM software to reduce the lead times of their manufacturing and engineering-related activities. First, following systematically steps in Figure 1, a cross-functional project team from key persons of the related department was set up for evaluation CAM software options. Then, the evaluation criteria and a set of alternatives were determined. For CAM software selection problem, the team determined 4 critical criteria, 20 sub-criteria and 5 alternatives (CATIA R29, I-DEAS NX 12, CREO 5.0, CIMATRON 14 and SIEMENS NX 9.0) as shown in Table 2.
New synthetic mitral valve model for human prolapsed mitral valve reconstructive surgery for training
Published in Journal of Medical Engineering & Technology, 2020
Dylan Goode, Sevda Mohammadi, Ray Taheri, Hadi Mohammadi
For the design of the geometry of the mitral valve prolapse, an innovative and new surfacing method based on the de Casteljau method was used on the Bezier-based surfaces [24,25]. The 3D geometry was established by assembling 2D images attained from the axial dissection of a diseased adult human mitral valve. The 2D images were digitized and adapted into a limited number of control points which were attained by mapping the 2D geometry of each plane using a CMM machine with a 3D Digital Corp, 3D scanner Cyberware. The final geometry was transferred to a CAD software by means of command Shell of I-Deas and AutoCAD V2015i software was used for the refinement of the 3D models. A cavity mold was then designed and fabricated in order to produce a synthetic mitral valve prolapse phantom (as shown in Figure 3) [26].