A study on the dynamic behaviour of a prestressed burst protection system with varying boundary conditions

1982 ◽  
Vol 67 (2) ◽  
pp. 227-243
Author(s):  
W. Matthees
Keyword(s):  
Boundary Conditions ◽  
Dynamic Behaviour ◽  
Protection System

Optimising the Efficiency of Storm Water Settling Basins by Means of Bypassing

1993 ◽  
Vol 27 (5-6) ◽  
pp. 105-110 ◽  
Author(s):  
F. H. L. R. Clemens ◽  
H. J. van Mameren ◽  
J. Kollen
Keyword(s):  
Boundary Conditions ◽  
Dynamic Behaviour ◽  
Storm Water ◽  
Mixed System ◽  
Research Needs ◽  
Settling Basin ◽  
Potential Increase ◽  
Overall Efficiency ◽  
Further Development

The reduction in pollutional load realised by storm water settling basins is potentially reduced due to the occurrence of a partially mixed situation in the basin or due to resuspension of settled material. The decrease in efficiency can theoretically be avoided by means of partially bypassing the basin. In order to quantify the potential increase in efficiency a settling basin in Amersfoort is taken as an example. This basin seems to behave like an almost completely mixed system, bypassing would increase the overall efficiency from ca. 34 % to ca 39 % for three overflows. The dynamic behaviour of settling basins, scouring conditions and the boundary conditions for which settling basins are to be designed are the research needs for further development in the field of storm water settling basins.

A finite element application in the analysis and design of point-supported composite conoidal shell roofs: Suggesting selection guidelines

2010 ◽  
Vol 45 (3) ◽  
pp. 165-177 ◽  
Author(s):  
H S Das ◽  
D Chakravorty
Keyword(s):  
Finite Element ◽  
Boundary Conditions ◽  
Dynamic Behaviour ◽  
Weight Ratio ◽  
High Strength ◽  
Conical Shells ◽  
Analysis And Design ◽  
Doubly Curved Shells ◽  
Doubly Curved ◽  
Bending Behaviour

In the present paper, a finite element code is applied to study the bending behaviour of point-supported composite conoidal shells. These doubly curved surfaces may look similar to single curved conical shells, but the non-developable conoids present much stiffer surfaces. Laminated composites offer a high strength-to-weight ratio, and composite conoidal shells can cover large column-free areas. These shells on point supports have wide applications in car parks and theatres. Research reports are available regarding the static and dynamic behaviour of composite and isotropic conoidal shells, but with different combinations of simply supported, clamped, and free boundary conditions. Reports on corner-point-supported isotropic rhombic plates and doubly curved shells also exist, but data on the bending behaviour of conoidal shells supported at discrete points only are missing. Hence, in the present paper, three different point-supported boundary conditions are considered with four different laminations, the relative performance of different shell options is studied in detail, and suitable approaches are proposed to choosing the best shell option among many in a practical situation.

scholarly journals Analysis of Thermal Protection System in Flex Seal of a Rocket Motor

2019 ◽  
Vol 9 (1) ◽  
pp. 4933-4936
Keyword(s):  
Thermal Analysis ◽  
Composite Materials ◽  
Boundary Conditions ◽  
Weight Reduction ◽  
Thermal Protection ◽  
Thermal Protection System ◽  
Protection System ◽  
Ansys Software ◽  
Single Time ◽  
Transient Thermal

A Thermal protection system is used to protect the rocket from the heat generated by the hot gases. A thermal boot is used as the thermal protection system at the outside of the nozzle to protect the flex seal. The objective of the present work is to design the thermal protection system for flex seal using different composite materials for single time of flight and to study the ablation of the materials. The problem is modelled using commercial ANSYS software. 3-D Axi-symmetric transient thermal analysis is performed for the flex seal along with thermal protection system made of composite materials. The initial and boundary conditions are applied to meet the industrial requirement. From this analysis, thermal protection system made of different composite materials is studied and one is suggested based on ablation and weight reduction.

The Proposal of Ensuring the Protection of Handicapped Inhabitants of Smart House

2012 ◽  
Vol 256-259 ◽  
pp. 2962-2966 ◽  
Author(s):  
Peter Hamernik ◽  
Pavol Tanuska
Keyword(s):  
Boundary Conditions ◽  
Response Time ◽  
Healthy Person ◽  
Protection System ◽  
Smart Systems ◽  
Active Elements ◽  
Handicapped People ◽  
Smart House ◽  
The Stability ◽  
Conditions Of Stability

Smart houses are currently gaining in the development of smart systems. One of the development areas are smart systems for handicapped people. This article is devoted to handicapped inhabitants of smart house with Alzheimer's disease associated with dementia. It compares the stability of a healthy person with handicapped inhabitant, under which determine the boundary conditions of stability. It describes the proposal of starting protection system before falling backward, and needed response time of active elements.

Dynamic Behaviour of Undamaged and Damaged Multilayered Composite Plates

2007 ◽  
Vol 347 ◽  
pp. 531-536 ◽  
Author(s):  
Marco Gherlone ◽  
Marco Di Sciuva
Keyword(s):  
Finite Element ◽  
Boundary Conditions ◽  
Dynamic Behaviour ◽  
Mixed Finite Element ◽  
Composite Plates ◽  
Higher Order ◽  
Mode Shapes ◽  
Vibration Frequencies ◽  
Numerical Examples ◽  
Multilayered Composite

The article deals with the application of a higher-order FEM approach to the analysis of the dynamic behaviour of undamaged and damaged multilayered composite plates. Some numerical examples show the accuracy of the developed plate mixed finite element, in terms of vibration frequencies and mode shapes, for different boundary conditions and with different damage geometries.

Thermal-Structural Analysis of Ni-Based Alloy Panel with Active Cooling Thermal Protection System

2014 ◽  
Vol 644-650 ◽  
pp. 4718-4721
Author(s):  
Guo Sun ◽  
Yuan Gui Sun
Keyword(s):  
Structural Analysis ◽  
Boundary Conditions ◽  
Combustion Chamber ◽  
Thermal Protection ◽  
Thermal Environment ◽  
Aircraft Engine ◽  
Thermal Protection System ◽  
Protection System ◽  
Mechanical Loads ◽  
Optimal Value

In hypersonic environments, the development of aircraft engine presents the mitigation of the extreme thermal environment inside the combustion chamber. This paper establishes the capabilities for combustor panel design. By given the key loading and boundary conditions of the panel structure, the thermal structural analysis determines temperatures and stresses and the optimization improves panel’s robustness subject to thermal mechanical loads. A parametric sweep analysis is carried and the results give the optimal value of the panel face thickness.

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