Application of Haptic Navigation to Modify Free-Form Surfaces Through Specified Points and Curves

2002 ◽  
Vol 2 (4) ◽  
pp. 265-276 ◽  
Author(s):  
Masatake Higashi ◽  
Nobuaki Aoki ◽  
Takanobu Kaneko
Keyword(s):  
Real Time ◽  
Force Feedback ◽  
Correction Function ◽  
Free Form ◽  
Cardinal Spline ◽  
Trimmed Surface ◽  
Pass Through ◽  
Free Form Surfaces ◽  
The Given ◽  
Haptic Sensation

In this paper, we propose a method which modifies free-form surfaces to pass through not only specified points, but also specified curves with the assistance of haptic navigation. Using the method, designers of aesthetic shapes, such as a car body, can manipulate the model of the shape in real-time looking at its stereoscopic image and feeling its haptic sensation as if there were a clay model. The haptic navigation helps designers, letting them capture and recognize the object easily and constraining their operation to the appropriate direction or along the specified geometric element. In addition, the designers can get force feedback proportional to the modification quantity. To obtain a smoothly modified shape, we introduce correction functions to the given surface equations. A correction function distributes the effect of the change over the whole shape or the specified region according to the distance of the point in the normal direction of the given surface. The values of the correction function are 1 at the indicated point and 0 at the boundaries, and the shape is modified to keep the original smoothness. The correction values of the functions at the indicated points are determined to pass through all of them by solving a linear equation. To apply this to the specified curves including boundaries of a trimmed surface, we treat points composing the curve similarly to the point specification by representing them with a Cardinal spline. We have confirmed that the system is effective to manipulate a shape with its feeling and that smooth surfaces are obtained in real time as designers want.

Parting Line Formation by Slicing a Trimmed Surface Model

1996 ◽  
Author(s):  
T. Wong ◽  
S. T. Tan ◽  
W. S. Sze
Keyword(s):  
Product Design ◽  
Free Form ◽  
Surface Model ◽  
Curved Surfaces ◽  
Line Formation ◽  
Planar Surfaces ◽  
Manufacturing Efficiency ◽  
Computer Aided ◽  
Trimmed Surface ◽  
Free Form Surfaces

Abstract The parting line on a product affects the final layout of the mould blocks and hence the manufacturing efficiency. The increased usage of free-form surfaces in product design increases the burden of computer aided parting line and parting surface determination. Previous proposed algorithms may not be sufficient to deal with such situation since most of them were originally designed to deal with products having planar surfaces or simple curved surfaces. A new algorithm is proposed to deal with such situation. The algorithm adopted a recursive uneven slicing on a trimmed surface model. The method provides a quick and efficient way of locating the parting line of a product.

Real Time Machinability Analysis of Free Form Surfaces on the GPU

2007 ◽  
Author(s):  
Mikola Lysenko ◽  
Keyvan Rahmani ◽  
Roshan D’Souza
Keyword(s):  
Real Time ◽  
Graphics Processing Units ◽  
Three Dimensional ◽  
Free Form ◽  
Complex Objects ◽  
Cad System ◽  
Solid Models ◽  
Early Design Stages ◽  
Graphics Processing ◽  
Free Form Surfaces

In this paper a new hardware accelerated method is presented to evaluate the machinability of free-form surfaces. This method works on tessellated models that are commonly used by CAD systems to render three-dimensional shaded images of solid models. Modern Graphics Processing Units (GPUs) can be programmed in hardware to accelerate specialized rendering techniques. In this research, we have developed new algorithms that utilize the programmability of GPUs to evaluate machinability of free-form surfaces. The method runs in real time on fairly inexpensive hardware (<$600), and performs well regardless of the surface type. The complexity of the method is dictated by the size of the projected view of the model. The proposed method can be used as a plug-in in a CAD system to evaluate manufacturability of a part at early design stages. The efficiency and the speed of the proposed method are demonstrated on some complex objects.

scholarly journals Laplacian-based Design: Sketching 3D Shapes

2006 ◽  
Vol 5 (3) ◽  
pp. 59-65 ◽  
Author(s):  
Bin Sheng ◽  
Enhua Wu
Keyword(s):  
Free Form ◽  
3D Space ◽  
3D Profile ◽  
Free Form Surfaces ◽  
The Given ◽  
2D Sketch ◽  
Laplacian Equations ◽  
3D Shapes ◽  
Minimum Curvature ◽  
3D Surfaces

The sketch-based shape modeling is one of the most challenging and active problems in computer graphics. In this paper, we present an interactive modeling system for generating free-form surfaces using a 2D sketch interface. Since inferring 3D shape from 2D sketches is an one to many function with no unique solution, we propose to interpret the given 2D curve to be the projection of the 3D curve that has minimum curvature among all the candidates in 3D. In this way, firstly, we present an algorithm to efficiently find a close approximation of this minimum curvature 3D space curve. In the second step, our system could identify the 3D surfaces automatically, and then we apply Delaunay triangulation on these surfaces. Finally, the shape of the triangular surface mesh that follows the 3D profile curves is computed using harmonic interpolation by solving Laplacian equations. We present experimental results on various kinds of drawings by the interactive modeler

scholarly journals Automatic Robot Trajectory for Thermal-Sprayed Complex Surfaces

2018 ◽  
Vol 2018 ◽  
pp. 1-11
Author(s):  
Dandan Fang ◽  
You Zheng ◽  
Botao Zhang ◽  
Xiangbo Li ◽  
Pengfei Ju ◽  
...  
Keyword(s):  
Complex Geometry ◽  
Automatic Generation ◽  
Simulation Software ◽  
Spray Angle ◽  
Free Form ◽  
Spray Parameters ◽  
Automotive Manufacturing ◽  
Robot Trajectory ◽  
Free Form Surfaces ◽  
The Given

Automatic trajectory generation for thermal spray application is highly desirable for today’s automotive manufacturing. Automatic robot trajectory for free-form surfaces to satisfy the coating uniform is still highly challenging due to the complex geometry of free-form surfaces. The purpose of this study is to present and implement a method for automatic generation of robot trajectory according to the given spray parameters on polygon profile and complex curved free-form surfaces, such as torch speed, spray distance, spray angle, and so on. This software development foundation is an Add-In programme of RobotStudio, which is off-line programming and simulation software of ABB Company. The experimental results show that the robot trajectory can be generated rapidly, accurately, and automatically on the complex geometries by this method.

Real-Time Machinability Analysis of Free Form Surfaces on the GPU

2009 ◽  
Vol 9 (2) ◽  
Author(s):  
Mikola Lysenko ◽  
Roshan D’Souza ◽  
Keyvan Rahmani
Keyword(s):  
Real Time ◽  
Computer Aided Design ◽  
Graphics Processing Units ◽  
Three Dimensional ◽  
Free Form ◽  
Complex Objects ◽  
Cad System ◽  
Solid Models ◽  
Aided Design ◽  
Free Form Surfaces

In this paper a new hardware accelerated method is presented to evaluate the machinability of free-form surfaces. This method works on tessellated models that are commonly used by computer aided design (CAD) systems to render three-dimensional shaded images of solid models. Modern graphics processing units (GPUs) can be programed in hardware to accelerate specialized rendering techniques. In this research, we have developed new algorithms that utilize the programmability of GPUs to evaluate the machinability of free-form surfaces. The method runs in real-time on fairly inexpensive hardware (<$600), and performs well regardless of the surface type. The complexity of the method is dictated by the size of the projected view of the model. The proposed method can be used as a plug-in in a CAD system to evaluate the manufacturability of a part at early design stages. The efficiency and the speed of the proposed method are demonstrated on some complex objects.

Real Time Curve Extrapolator for Fixtureless Inspection of Freeform Surfaces

2006 ◽  
Author(s):  
D. Steiner
Keyword(s):  
Real Time ◽  
Reference Plane ◽  
Free Form ◽  
Depth Of Field ◽  
Test Cases ◽  
Sampled Data ◽  
Time Curve ◽  
Small Depth ◽  
Manufacturing Process Control ◽  
Free Form Surfaces

The inspection of free-form surfaces is an important task in manufacturing process control. This task motivated researchers to develop methodologies and technologies for fixtureless inspection. The motivation for performing fixtureless inspection rises from the fact that a datum or an exact fixture is not always available for free-form objects. When datum and fixtures are not present, the location and rotation of the object in space relative to the sensor coordinate system are unknown. Thus, scanning along a proper trajectory is not trivial especially when dealing with high precision sensors with small depth of field (DOF). In this paper we introduce a theoretical scheme for real time curve extrapolation. This scheme performs real time automatic adjustment to the sensor depth of field by smoothly changing the position of the sensor. The proposed scheme can handle local C1 discontinuity (C0 continuity). In the proposed scheme, the velocity of the motion stages can be controlled by the curvature of the extrapolated curve, thus controlling the density of the sampled data. Also, no knowledge of the surface orientation and location is needed nor any reference plane or other datum. The scheme was tested using computer simulation that was developed for this purpose. The robustness of the scheme is shown at the end of this paper through simulation results using high order polynomial surfaces as test cases.

Development of a STEP-NC Controller for 5-Axis Machining of NURBS Surfaces

2011 ◽  
Vol 317-319 ◽  
pp. 1940-1948
Author(s):  
Xia Li ◽  
Hong Bin Liang
Keyword(s):  
Machine Tool ◽  
Real Time ◽  
Information Exchange ◽  
Free Form ◽  
Cnc System ◽  
Cad Cam ◽  
Nurbs Surfaces ◽  
Free Form Surfaces ◽  
Conventional Machining ◽  
Rotary Type

In conventional machining of free form surfaces, incomplete information exchange between CNC and CAD/CAM results in many limitations need to be rectified. In the paper, a new structure of CNC based on STEP-NC is proposed. A 5-axis real-time interpolator for NURBS surfaces machining is realized. A STEP-NC controller has been developed, which is a software modular CNC system. The CNC system has been installed on a tilt-rotary type 5-axis machine tool. The milling experiment has been performed.

General Framework of Optimal Tool Trajectory Planning for Free-Form Surfaces in Surface Manufacturing

2005 ◽  
Vol 127 (1) ◽  
pp. 49-59 ◽  
Author(s):  
Heping Chen ◽  
Ning Xi ◽  
Weihua Sheng ◽  
Yifan Chen
Keyword(s):  
Trajectory Planning ◽  
Computer Aided Design ◽  
General Framework ◽  
Planning Process ◽  
Spray Forming ◽  
Industrial Robots ◽  
Free Form ◽  
Tool Trajectory ◽  
Free Form Surfaces ◽  
The Given

Surface manufacturing is a process of adding material to or removing material from the surfaces of a part. Spray painting, spray forming, rapid tooling, spray coating, and polishing are some of the typical applications of surface manufacturing, where industrial robots are usually used. Tool planning for industrial robots in surface manufacturing is a challenging research topic. Typical teaching methods are not affordable any more because products are subject to a shorter product life, frequent design changes, small lot sizes, and small in-process inventory restrictions. An automatic tool trajectory planning process is hence desirable for tool trajectory planning of industrial robots. Based on the computer-aided design model of a part, the tool model, task constraints, and optimization criteria, a general framework of optimal tool trajectory planning in surface manufacturing is developed. Optimal tool trajectories are generated by approximately solving a multiobjective optimization problem. To test if the generated trajectory satisfies the given constraints, a trajectory verification model is developed. Simulations are performed to determine if the given constraints are satisfied. Simulation results show that the optimal tool trajectory planning framework can be applied to generate trajectories for a variety of applications in surface manufacturing. This general framework can also be extended to other applications such as dimensional inspection and demining.

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