scholarly journals Applying Virtual Reality Techniques to Sensitivity-Based Structural Shape Design

1998 ◽  
Vol 120 (4) ◽  
pp. 612-619 ◽  
Author(s):  
T. P. Yeh ◽  
J. M. Vance
Keyword(s):  
Sensitivity Analysis ◽  
Virtual Reality ◽  
Three Dimensional ◽  
Element Model ◽  
Free Form ◽  
Shape Design ◽  
Connecting Rod ◽  
Structural Shape ◽  
Initial Application ◽  
Free Form Deformation

Virtual reality (VR) provides a design space consisting of three-dimensional computer images where participants can interact with these images using natural human motions in real time. In the field of engineering design, prototyping and design verification have provided the initial application areas for VR. The research presented in this paper takes the scenario one step further by incorporating free-form deformation techniques and sensitivity analysis into the virtual world such that the designer can easily implement analysis-based shape design of a structural system where stress considerations are important. NURBS-based free-form deformation (NFFD) methods and direct manipulation techniques are used as the interface between the VR interaction and the finite element model. Sensitivity analysis is used to allow the designer to change the design model and immediately view the effects without performing a re-analysis. An engine connecting rod is analyzed to demonstrate how virtual reality techniques can be applied to structural shape design.

scholarly journals Applying Virtual Reality Techniques to Sensitivity-Based Structural Shape Design

1997 ◽  
Author(s):  
Tsung-Pin Yeh ◽  
Judy M. Vance
Keyword(s):  
Sensitivity Analysis ◽  
Virtual Reality ◽  
Three Dimensional ◽  
Element Model ◽  
Free Form ◽  
Shape Design ◽  
Connecting Rod ◽  
Structural Shape ◽  
Initial Application ◽  
Free Form Deformation

Abstract Virtual reality (VR) provides a design space consisting of three-dimensional computer images where participants can interact with these images using natural human motions in real time. In the field of engineering design, prototyping and design verification have provided the initial application areas for VR. The research presented in this paper takes the scenario one step further by incorporating free-form deformation techniques and sensitivity analysis into the virtual world such that the designer can easily implement analysis-based shape design of a structural system where stress considerations are important. NURBS-based free-form deformation (NFFD) methods and direct manipulation techniques are used as the interface between the VR interaction and the finite element model. Sensitivity analysis is used to allow the designer to change the design model and immediately view the effects without performing a re-analysis. An engine connecting rod is analyzed to demonstrate how virtual reality techniques can be applied to structural shape design.

scholarly journals A Multi-Fidelity Model for Simulations and Sensitivity Analysis of Piezoelectric Inkjet Printheads

Micromachines ◽  
2021 ◽  
Vol 12 (9) ◽  
pp. 1038
Author(s):  
Vinh-Tan Nguyen ◽  
Jason Yu Chuan Leong ◽  
Satoshi Watanabe ◽  
Toshimitsu Morooka ◽  
Takayuki Shimizu
Keyword(s):  
Sensitivity Analysis ◽  
Three Dimensional ◽  
Element Model ◽  
Geometrical Parameters ◽  
Generation Process ◽  
Mechanical Coupling ◽  
Design Variables ◽  
Computational Structural Mechanics ◽  
Lumped Element Model ◽  
Inkjet Printhead

The ink drop generation process in piezoelectric droplet-on-demand devices is a complex multiphysics process. A fully resolved simulation of such a system involves a coupled fluid–structure interaction approach employing both computational fluid dynamics (CFD) and computational structural mechanics (CSM) models; thus, it is computationally expensive for engineering design and analysis. In this work, a simplified lumped element model (LEM) is proposed for the simulation of piezoelectric inkjet printheads using the analogy of equivalent electrical circuits. The model’s parameters are computed from three-dimensional fluid and structural simulations, taking into account the detailed geometrical features of the inkjet printhead. Inherently, this multifidelity LEM approach is much faster in simulations of the whole inkjet printhead, while it ably captures fundamental electro-mechanical coupling effects. The approach is validated with experimental data for an existing commercial inkjet printhead with good agreement in droplet speed prediction and frequency responses. The sensitivity analysis of droplet generation conducted for the variation of ink channel geometrical parameters shows the importance of different design variables on the performance of inkjet printheads. It further illustrates the effectiveness of the proposed approach in practical engineering usage.

A Method of Interactive Surface Free-Form Deformation Based on Control Point and Neighborhood Constraints

2011 ◽  
Vol 338 ◽  
pp. 277-281
Author(s):  
Chao Hua Peng ◽  
Fei Liu ◽  
Li Li
Keyword(s):  
Control Point ◽  
Three Dimensional ◽  
Free Form ◽  
Control Points ◽  
Deformation Method ◽  
Face Modeling ◽  
Free Form Deformation ◽  
Local Modification ◽  
Interactive Surface ◽  
Three Dimensional Models

In view of the problem that it’s hard to determine the control points and morphing is not intuitionistic in traditional surface free-form deformation technology, an interactive surface free-form deformation method is proposed in this paper. Using this method, the user no longer needs to dynamically set constraint points outside the model. The point picked up by the user according to the desired deformation is used as a control point, and the neighborhood range of deformation or the deformation shape is controlled by deformation function. The designer can interactively deform the model simply by setting control parameters. The experiment results by applying the method to face modeling show that the proposed method is feasible and effective, providing a convenient way for the local modification of three-dimensional models.

scholarly journals Virtual Reality Interactive Design Utilizing Meshless Stress Re-Analysis

2005 ◽  
Author(s):  
Kurt Chipperfield ◽  
Judy Vance
Keyword(s):  
Virtual Reality ◽  
Stress State ◽  
Interactive Design ◽  
Free Form ◽  
Accurate Approximation ◽  
Original Design ◽  
Accurate Analysis ◽  
Taylor Series Approximation ◽  
Analysis Technique ◽  
Free Form Deformation

Interactive design gives engineers the ability to modify the shape of a part and immediately see the changes in the part’s stress state. Virtual reality techniques are utilized to make the process more intuitive and collaborative. The results of a meshless stress analysis are superimposed on the original design. As the engineer modifies the design using subdivision volume free-form deformation, the stress state for the modified design is computed using a Taylor series approximation. When the designer requests a more accurate analysis, a stress re-analysis technique based on the pre-conditioned conjugate gradient method is used with parallel processing to quickly compute an accurate approximation of the stresses for the new design.

Fully free-form deformation features for aesthetic shape design

2005 ◽  
Vol 16 (2) ◽  
pp. 115-133 ◽  
Author(s):  
Jean-philippe Pernot ◽  
Bianca Falcidieno ◽  
Franca Giannini ◽  
Jean-claude Léon
Keyword(s):  
Free Form ◽  
Shape Design ◽  
Free Form Deformation ◽  
Deformation Features

Three Dimensional Head Modeling Based on Direct Free Form Deformation

2018 ◽  
pp. 156-165
Author(s):  
Haixiao Liu ◽  
Yanling Zheng ◽  
Xiai Wang ◽  
Taijie Liu ◽  
Linghua Ran ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Free Form ◽  
Free Form Deformation

Using Discrete Element Model to Simulate Keel-Gouging: A Sensitivity Analysis

2017 ◽  
Author(s):  
Eleanor Bailey Dudley ◽  
Lei Liu ◽  
Robert Sarracino ◽  
Rocky Taylor
Keyword(s):  
Sensitivity Analysis ◽  
Young’S Modulus ◽  
Oil And Gas ◽  
Young's Modulus ◽  
Three Dimensional ◽  
Friction Angle ◽  
Element Model ◽  
Discrete Element ◽  
Discrete Element Model ◽  
Premature Failure

A three-dimensional discrete element model is under development to simulate a number of different keel-gouge and subsea interaction scenarios. The model is being validated against controlled tests conducted in the National Research Council’s ice tank facility under the Pipeline Ice Risk and Mitigation (PIRAM) Joint Industry Project, which was led by C-CORE on behalf of a number of oil and gas companies. To investigate the influence of certain key parameters on the failure behaviour of the keel, a sensitivity analysis has been carried out. Best results were achieved when Young’s modulus of the keel was 5 MPa, the shear-to-tensile ratio of the freeze bonds was set to 1.2, the internal friction angle of the ice was 9°, the bond breakage ratio 0.8 % and Young’s modulus of the gravel 0.01 MPa. A low modulus for the gravel was needed to prevent premature failure of the keel, a consequence of the model not accounting for soil deformations. Using these parameters the model was able to accurately reproduce the loads on the soil tray during peak loading. Future developments in the model include using ‘clumps’ to give more representative ice block shapes, which will allow interlocking between ice pieces and the development of force chains.

Attitude-aware method for hydraulic support groups in a virtual reality environment

2019 ◽  
Vol 233 (14) ◽  
pp. 4805-4818 ◽  
Author(s):  
Jiacheng Xie ◽  
Xuewen Wang ◽  
Zhaojian Yang ◽  
Shangqing Hao
Keyword(s):  
Virtual Reality ◽  
Coal Mining ◽  
Support Groups ◽  
Three Dimensional ◽  
Connecting Rod ◽  
Monitoring Methods ◽  
Virtual Reality Environment ◽  
Hydraulic Support ◽  
Efficient Operation ◽  
Hydraulic Supports

Current monitoring methods for hydraulic supports are designed for single machines and are unsuitable for global monitoring. This paper presents an attitude-aware method for hydraulic support groups in a virtual reality environment, which predicts the next cycle attitude in real time by a Grey–Markov prediction model. The attitude datum includes the supporting height and the corresponding attitude angles, which are obtained by installing tilt sensors on the base, the front or rear connecting rod, or the roof beam. The operation state of the hydraulic supports was determined by comparing the predicted and actual data. Next, the hydraulic support attitude was related to the coal-mining height observed through multiple cycles. The three-dimensional virtual monitoring was solved in SQL SERVER, Kingview, Unity3d, and Matlab software. Finally, the proposed method was verified on 40 hydraulic supports of a working face through 17 cycles in an underground experiment. The predictive lateral and longitudinal accuracy reached 78.9 and 82.3%, respectively. By efficiently visualizing the operation state of the hydraulic support groups in three-dimensional mode, this method can predict the future attitude with high accuracy and reliability. Therefore, it provides a theoretical approach to safe and efficient operation of a fully mechanized coal-mining face.

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