Algorithm for three-dimensional curved block cutting analysis in solid modeling

2020 ◽  
Vol 360 ◽  
pp. 112721
Author(s):  
Qi-Hua Zhang ◽  
Hai-Dong Su ◽  
Shao-Zhong Lin ◽  
Gen-Hua Shi
2007 ◽  
Vol 197 (6) ◽  
pp. S62
Author(s):  
Linda Kleeman ◽  
Edward Tangchitnob ◽  
Sabrina Craigo ◽  
Simona Socrate ◽  
Michael House

2014 ◽  
Vol 538 ◽  
pp. 79-82
Author(s):  
Zhi Dong Huang ◽  
Yun Pu Du ◽  
Han Xiao Li ◽  
Xiu Li Sun ◽  
Yu Wang

The characteristics of oval gear is analyzed. The parameters of oval gear are chosen and calculated. The three-dimensional solid modeling of oval gear is achieved. The dynamic model of oval gear is established by FEM and modal analysis of oval gear is investigated. The natural frequency and major modes of the first six orders are clarified. The method and the result facilitate the dynamic design and dynamic response analysis of oval gear.


1998 ◽  
Vol 14 (4) ◽  
pp. 287-308 ◽  
Author(s):  
A. Pandolfi ◽  
M. Ortiz

1993 ◽  
Vol 21 (3) ◽  
pp. 199-219 ◽  
Author(s):  
John S. Pirolo ◽  
Stephen J. Bresina ◽  
Lawrence L. Creswell ◽  
Kent W. Myers ◽  
Barna A. Szabó ◽  
...  

Author(s):  
Chih-Wei Chen ◽  
Hong-Sen Kou ◽  
Hsueh-Erh Liu ◽  
Cheng-Keng Chuang ◽  
Li-Jen Wang

Cryosurgery is also called as cryoablation or cryoleision. The third generation of cryo-machine use argon gas for cooling and helium for rewarming to destroy cancer cells. The probes may be put into the tumor during surgery or through the skin (percutaneously). After cryosurgery, the frozen tissue thaws and is either naturally absorbed by the body (for internal tumors), or it dissolves and forms a scab (for external tumors). The main purpose of this paper is to establish a preliminary computer assisted simulation in prostate tumor cryosurgery. A radiologist and an urologist in a medical center in addition to the engineering specialist from the university participated in this interdisciplinary research program. The first step of this simulation protocol is to trim hundreds of two-dimensional medical imaging photos from a patient through the imaging reconstructive software into building a three-dimensional solid modeling. The image data for each patient can be obtained from the x-ray computed tomography (CT), or magnetic resonance imaging (MRI) in the imaging department of hospital. It has successfully built up the related knowledge to overcome the complicacy between the medical imaging modalities and engineering graphic solid modeling with high resolution. It is worthy to mention here that the present solid modeling of prostate can demonstrate the variable diameters and courses of the prostate urethra in vivo. The second step focuses on thermal calculation. So far, there has been no existing commercial software for the specific purpose of the bioheat transfer problem. Hence, user subroutines must be added to the existing commercial software to simulate the clinical situation of cryosurgery. For example, the occurrence of phase change during some specified temperature range and the latent heat of fusion are also incorporated into bio-heat transfer model. It has successfully incorporated bioheat transfer model into the software program to fit the reality in thermal medicine. The third step supplies the data and knowledge concerned with the position of a tumor and the related mechanism of metabolism of living tissue and vessels. The number of probes, the position of each probe, and the operating time of each probe will be explored to ensure a complete killing of the tumor tissue while saving as much healthy surrounding tissue as possible. In this study, the three-dimensional transient temperature distributions based on cryosurgery for prostate tumors have been performed for several cases to find the optimal operating conditions. Different cryoprobes with different freezing time are considered to find the temperature distribution. The simulation results for cryosurgery of prostate tumors will be supplied for practicing physicians as reference to greatly improve the effectiveness of cryosurgery.


2011 ◽  
Vol 328-330 ◽  
pp. 360-363
Author(s):  
Ai Hua Ren ◽  
Guo Xing Sun ◽  
Chuan Qiong Sun

Though spatial cam has been widely used in various fields of machinery and equipment ,but it is seldom used in continuously variable transmission situation. So firstly the working principle of spatial cam for CVT is introduced, and then equations of the pitch curve and cam contour are derived .In order to get the required dimensions and parameters of spatial cam during three dimensional modeling, program is developed with programming software Mathcad and the corresponding programming flow chart is listed out. And the running results of the Mathcad program and features of spatial cam in Pro/E are correlated to realize solid modeling, at last an example is given to demonstrate the feasibility and flexiblity of this method.


Author(s):  
E. P. Canevese ◽  
T. De Gottardo

The morphometric and photogrammetric knowledge, combined with the historical research, are the indispensable prerequisites for the protection and enhancement of historical, architectural and cultural heritage. <br><br> Nowadays the use of BIM (Building Information Modeling) as a supporting tool for restoration and conservation purposes is becoming more and more popular. However this tool is not fully adequate in this context because of its simplified representation of three-dimensional models, resulting from solid modelling techniques (mostly used in virtual reality) causing the loss of important morphometric information. <br><br> One solution to this problem is imagining new advanced tools and methods that enable the building of effective and efficient three-dimensional representations backing the correct geometric analysis of the built model. <br><br> Twenty-year of interdisciplinary research activities implemented by Virtualgeo focused on developing new methods and tools for 3D modeling that go beyond the simplified digital-virtual reconstruction used in standard solid modeling. Methods and tools allowing the creation of informative and true to life three-dimensional representations, that can be further used by various academics or industry professionals to carry out diverse analysis, research and design activities. <br><br> Virtualgeo applied research activities, in line with the European Commission 2013’s directives of Reflective 7 &amp;ndash; Horizon 2020 Project, gave birth to GeomaticsCube Ecosystem, an ecosystem resulting from different technologies based on experiences garnered from various fields, metrology in particular, a discipline used in the automotive and aviation industry, and in general mechanical engineering. <br><br> The implementation of the metrological functionality is only possible if the 3D model is created with special modeling techniques, based on surface modeling that allow, as opposed to solid modeling, a 3D representation of the manufact that is true to life. <br><br> The advantages offered by metrological analysis are varied and important because they permit a precise and detailed overview of the 3D model’s characteristics, and especially the over time monitoring of the model itself, these informations are impossible to obtain from a three-dimensional representation produced with solid modelling techniques. The applied research activities are also focused on the possibility of obtaining a photogrammetric and informative 3D model., Two distinct applications have been developed for this purpose, the first allows the classification of each individual element and the association of its material characteristics during the 3D modelling phase, whilst the second allows segmentations of the photogrammetric 3D model in its diverse aspects (materic, related to decay, chronological) with the possibility to make use and to populate the database, associated with the 3D model, with all types of multimedia contents.


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