Structural deformation/instability of the co-extrudate rubber profiles due to die swell: Experimental and CFD studies with 3D models

2021 ◽  
pp. 130504
Author(s):  
Sujit Sharma ◽  
Mohit Goswami ◽  
Arghya Deb ◽  
Bhojraj Padhan ◽  
Santanu Chattopadhyay
Keyword(s):  
3D Models ◽  
Structural Deformation ◽  
Die Swell ◽  
Deformation Instability

The Leaking Protection Technology of Structural Deformation Joint after Cracking

2013 ◽  
Vol 353-356 ◽  
pp. 2782-2786
Author(s):  
Yan Mei Zhang ◽  
Hong Wen Li ◽  
Ding Hong Jin
Keyword(s):  
Material Selection ◽  
Structural Deformation ◽  
Expansion Joint ◽  
Underground Engineering ◽  
Water Leakage ◽  
Flexible Materials ◽  
The Past ◽  
Protection Technology ◽  
Deformation Instability ◽  
Selection Of

In this paper, through dealing with the leakage protection of underground engineering,do the research in leakage protection problems of groundwater seepage caused by concrete cracks and foundation settlement in underground concrete engineering,for the structure with different crack leakage protection in different methods, is discussed in aspects of material selection, construction process.Especially for the water leakage problem of the concrete structure,the settlement of the structure caused by the settlement joint and the stretching of expansion joint caused by the air shrinkage and temperature change of concrete.Change the past with rigid material plugging, by reasonable selection of material, the comprehensive application of the rigid and flexible materials,to solve the problem of water leakage caused by structure settlement joint and expansion joint, so as to solve deformation instability problem on the structure of settlement joint and expansion joint after leakage.

Simulation of Structural Deformations of Flexible Piping Systems by Acoustic Excitation Using Modal Controllabilities

2005 ◽  
Author(s):  
Matthias K. Maess ◽  
Lothar Gaul
Keyword(s):  
3D Models ◽  
Three Dimensions ◽  
Structural Deformation ◽  
Piping System ◽  
Structural Domain ◽  
Hydraulic Systems ◽  
Sound Waves ◽  
Fluid Structure ◽  
Piping Systems ◽  
Acoustic Sources

Valve action and pump fluctuation in piping systems can lead to undesired excitation of structural components by propagating sound waves in the fluid path. This vibro-acoustic problem is addressed by studying the dynamics as well as excitation mechanism. Fluid-structure interaction has a significant influence on both hydroacoustics and on structural deformation. Therefore, pipe models are generated in three dimensions by using Finite Elements to include higher-order deflection modes and fluid modes. The acoustic wave equation in the fluid is hereby fully coupled to the structural domain at the fluid-structure interface. These models are used for simulating transient response and for performing numerical modal analysis. Unfortunately, such 3D models are large and simulation runs turn out to be very time consuming. To overcome this limitation, reduced pipe models are needed for efficient simulations. The proposed model reduction is hereby based on a series of modal transformations and modal truncations, where focus is placed on the treatment of the nonsymmetric system matrices due to the coupling. Afterwards, dominant modes are selected based on controllability and observability considerations. Furthermore, modal controllabilities are used to quantify the excitation of vibration modes by white noise at the pipe inlet representing acoustic sources. The excitation of structural elements connected to the piping system can therefore be predicted without performing transient simulations. Numerical results are presented for spatially arranged complex piping systems including elbow pipes and joints connected to target structures to demonstrate the usefulness of the presented method for vibro-acoustic investigations. The method is to support the design and the analysis of fluid-filled elastic piping systems and its environment in the presence of acoustic sources such as in hydraulic systems.

Simulation of Structural Deformations of Flexible Piping Systems by Acoustic Excitation

2006 ◽  
Vol 129 (3) ◽  
pp. 363-371 ◽  
Author(s):  
Matthias K. Maess ◽  
Lothar Gaul
Keyword(s):  
3D Models ◽  
Three Dimensions ◽  
Structural Deformation ◽  
Piping System ◽  
Structural Domain ◽  
Sound Waves ◽  
Fluid Structure ◽  
Piping Systems ◽  
Transient Simulations ◽  
Structural Deformations

Valve actuation and pump fluctuation in piping systems generate propagating sound waves in the fluid path which in turn can lead to undesired excitation of structural components. This vibro-acoustic problem is addressed by studying the propagation dynamics as well as the excitation mechanism. Fluid-structure interaction has a significant influence on both hydroacoustics and on structural deformation. Therefore, pipe models are generated in three dimensions by using finite elements in order to include higher-order deflection modes and fluid modes. The acoustic wave equation in the fluid is hereby fully coupled to the structural domain at the fluid-structure interface. These models are used for simulating transient response and for performing numerical modal analysis. Unfortunately, such 3D models are large and simulation runs turn out to be very time consuming. To overcome this limitation, reduced pipe models are needed for efficient simulations. The proposed model reduction is based on a series of modal transformations and modal truncations, where focus is placed on the treatment of the nonsymmetric system matrices due to the coupling. Afterwards, dominant modes are selected based on controllability and observability considerations. Furthermore, modal controllabilities are used to quantify the excitation of vibration modes by a white noise acoustic source at the pipe inlet. The excitation of structural elements connected to the piping system can therefore be predicted without performing transient simulations. Numerical results are presented for a piping system consisting of straight pipe segments, an elbow pipe, joints, and a target structure. This example illustrates the usefulness of the presented method for vibro-acoustic investigations of more complex piping systems.

THE GENESIS OF TOOLS FOR TEACHING PUPILS TO DEVELOP FLOWCHARTS

2020 ◽  
pp. 11-15
Author(s):  
A. A. Zubrilin ◽  
M. N. Makarov
Keyword(s):  
Historical Perspective ◽  
3D Models ◽  
Computer Applications ◽  
Internet Services

The historical perspective provides an overview of how to study flowcharts in a school informatics course. Computer applications and Internet services are considered that automate the development of flowcharts. It is shown how 3D technologies can help an informatics teacher in preparing 3D models for the study of flowcharts.

Automatic generation of bas-relief on 3D models based on 2D images for rhinoceros

2018 ◽  
Vol 23 (6) ◽  
pp. 99-113
Author(s):  
Sha LIU ◽  
Feng YANG ◽  
Shunxi WANG ◽  
Yu CHEN
Keyword(s):  
3D Models ◽  
Automatic Generation ◽  
2D Images

Feasibility of the Use of 3D Models to Improve Regional Locations in W. China, Central Asia, and Parts of the Middle East

2002 ◽  
Author(s):  
Michael H. Ritzwoller ◽  
Nikolai M. Shapiro ◽  
Anatoli L. Levshin ◽  
Eric A. Bergman ◽  
Eric R. Engdahl
Keyword(s):  
Middle East ◽  
Central Asia ◽  
3D Models
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