Efficient Combination of Numerical Simulations and Ice Basin Testing in the Design Process of Moored Structures in Ice

2011 ◽  
Author(s):  
A. Jensen ◽  
B. Bonnemaire ◽  
T. Lundamo ◽  
O. Ravndal
Keyword(s):  
Numerical Simulations ◽  
Design Process

scholarly journals Sub-Terahertz Computer Generated Hologram with Two Image Planes

2019 ◽  
Vol 9 (4) ◽  
pp. 659 ◽  
Author(s):  
Mateusz Surma ◽  
Izabela Ducin ◽  
Przemyslaw Zagrajek ◽  
Agnieszka Siemion
Keyword(s):  
Numerical Simulations ◽  
Design Process ◽  
Terahertz Radiation ◽  
Experimental Evaluation ◽  
Detailed Design ◽  
Computer Generated Hologram ◽  
Ping Pong ◽  
Good Accordance ◽  
Image Planes ◽  
Optical Structure

An advanced optical structure such as a synthetic hologram (also called a computer-generated hologram) is designed for sub-terahertz radiation. The detailed design process is carried out using the ping-pong method, which is based on the modified iterative Gerchberg–Saxton algorithm. The novelty lies in designing and manufacturing a single hologram structure creating two different images at two distances. The hologram area is small in relation to the wavelength used (the largest hologram dimension is equivalent to around 57 wavelengths). Thus, it consists of a small amount of coded information, but despite this fact, the reconstruction is successful. Moreover, one of the reconstructed images is larger than the hologram area. Good accordance between numerical simulations and experimental evaluation was obtained.

The Influence of Cold Forming Conception on the Springback Magnitude

2013 ◽  
Vol 554-557 ◽  
pp. 2299-2311
Author(s):  
Paweł Bałon ◽  
Andrzej Świątoniowski
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulations ◽  
Design Process ◽  
High Strength ◽  
Cold Forming ◽  
Springback Compensation ◽  
Special Cases ◽  
Trial Test

Cold forming, especially for steels of increased mechanical properties, encounters problem with a springback. Most of the tools require compensation of that effect, however it is not always feasible in a conventional way. In some special cases such as twisting springback, compensation of a tool remains an ineffective method of solving the problem. This paper aims to investigate the behaviour of springback deviation which may be reduced using the change of forming conception such as: crash forming, holding and stamping or stamping with pad. The results lead to an in-depth understanding of the design process and parameters for advanced high strength components. It is immensely important for tool shops which usually have only few weeks to make a tool. The essence of designing and numerical simulations must be emphasized. Without them some problems with twisting springback may be encountered during trial test what would involve labour absorbing corrections and some extra costs. Therefore, it is crucial to pay attention to forming conception, as using it we can obtain entirely different

scholarly journals The numerical simulation of FOPS and ROPS tests using LS-DYNA

Mechanika ◽  
2019 ◽  
Vol 25 (5) ◽  
pp. 383-390
Author(s):  
Grzegorz Kokot ◽  
Witold Ogierman
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Numerical Simulations ◽  
Design Process ◽  
Numerical Models ◽  
Finite Element Simulations ◽  
Working Environment ◽  
International Code ◽  
Protective Structure ◽  
Discrete Finite Element

The paper presents design process and numerical simulations of safety tests of the operator's protective structure of earth-moving machinery. It is connected with international code requirements according to design the protective structure of machines in the case of working environment with a danger of falling objects or situation of rolling-over. The discrete finite element numerical models and results of numerical simulation of codes required tests are presented. All finite element simulations were done using LS-DYNA software.

A Mechatronic Device for the Rehabilitation of Ankle Motor Function

2009 ◽  
Vol 131 (12) ◽  
Author(s):  
Giuseppe Bucca ◽  
Alberto Bezzolato ◽  
Stefano Bruni ◽  
Franco Molteni
Keyword(s):  
Numerical Simulations ◽  
Motor Function ◽  
Design Process ◽  
Neurological Diseases ◽  
Control Design ◽  
Design Validation ◽  
Research Project ◽  
Electromechanical Actuator ◽  
Definition Of ◽  
And Control

This paper presents the main results from a research aiming at the design of an electromechanical actuator for use in the rehabilitation of ankle motor function in patients suffering due to neurological diseases. Motivations for the research project are discussed within the framework of the application of mechatronic concepts for rehabilitation practice. The entire design process is then described, from the definition of project targets through the mechanical concept and control design steps until design validation by means of numerical simulations and tests on a prototype.

Design and numerical characterization of a new leg exoskeleton for motion assistance

Robotica ◽  
2014 ◽  
Vol 33 (5) ◽  
pp. 1147-1162 ◽  
Author(s):  
Cristian Copilusi ◽  
Marco Ceccarelli ◽  
Giuseppe Carbone
Keyword(s):  
Numerical Simulations ◽  
Ankle Joint ◽  
Design Process ◽  
Low Cost ◽  
Simple Construction ◽  
Joint Level ◽  
Cam Mechanism ◽  
Numerical Characterization

SUMMARYThis paper addresses attention to a design for a low-cost exoskeleton with fairly simple construction, lightweight, easy to wear and to adapt to human legs. The design core is focused on a cam-mechanism implementation at the ankle joint level of the leg exoskeleton. The engineering feasibility of the proposed design is characterized by numerical simulations for the design process.

scholarly journals Development of an indoor testing rig for façade integrated solar thermal collectors

2019 ◽  
Vol 85 ◽  
pp. 04005 ◽  
Author(s):  
Macedon Moldovan ◽  
Ion Vişa
Keyword(s):  
Renewable Energy ◽  
Numerical Simulations ◽  
Design Process ◽  
Energy Systems ◽  
Building Envelope ◽  
Solar Thermal ◽  
Research Centre ◽  
Renewable Energy Systems ◽  
Indoor Thermal Comfort ◽  
Solar Thermal Collectors

New solar thermal collectors with triangular and trapezoidal shapes and different colours (red, blue, green etc.) were developed in the Renewable Energy Systems and Recycling Research Centre, R&D Institute of the Transilvania University of Brasov, Romania to increase their architectural acceptance when integrated in buildings façades. An indoor testing rig was developed to assess: a) the performance of the new solar thermal collectors vertically installed on the façade, b) the influence of the façade integrated solar thermal collectors on the building envelope and thus on the indoor thermal comfort, c) the influence of the building envelope on the solar thermal collectors efficiency. The design process of the indoor testing rig is presented in the paper along with numerical simulations and experimental results.

Virtual Gas Turbine: Pre-Processing and Numerical Simulations

2016 ◽  
Author(s):  
Feng Wang ◽  
Mauro Carnevale ◽  
Gan Lu ◽  
Luca di Mare ◽  
Davendu Kulkarni
Keyword(s):  
Computational Model ◽  
Numerical Simulations ◽  
Gas Turbine ◽  
Design Process ◽  
Large Scale ◽  
Physical Phenomenon ◽  
Navier Stokes ◽  
Time Cost ◽  
Turbine Engine ◽  
Geometrical Shapes

The design process of a gas turbine engine involves interrelated multi-disciplinary and multi-fidelity designs of engine components. Traditional component-based design process is not always able to capture the complicated physical phenomenon caused by component interactions. It is likely that such interactions are not resolved until hardware is built and tests are conducted. Component interactions can be captured by assembling all these components into one computational model. Nowadays, numerical solvers are fairly easy to use and the most time-consuming (in terms of man-hours) step for large scale gas turbine simulations is the preprocessing process. In this paper, a method is proposed to reduce its time-cost and make large scale gas turbine numerical simulations affordable in the design process. The method is based on a novel featured-based in-house geometry database. It allows the meshing modules to not only extract geometrical shapes of a computational model and additional attributes attached to the geometrical shapes as well, such as rotational frames, boundary types, materials, etc. This will considerably reduce the time-cost in setting up the boundary conditions for the models in a correct and consistent manner. Furthermore, since all the geometrical modules access to the same geometrical database, geometrical consistency is satisfied implicitly. This will remove the time-consuming process of checking possible mismatching in geometrical models when many components are present. The capability of the proposed method is demonstrated by meshing the whole gas path of a modern three-shaft engine and the Reynold’s Averaged Navier-Stokes (RANS) simulation of the whole gas path.

scholarly journals M-Bonacci Zone Plates for Ultrasound Focusing

Sensors ◽  
2019 ◽  
Vol 19 (19) ◽  
pp. 4313 ◽  
Author(s):  
Sergio Pérez-López ◽  
José Miguel Fuster ◽  
Pilar Candelas
Keyword(s):  
Numerical Simulations ◽  
Design Process ◽  
Design Parameter ◽  
Industrial Applications ◽  
Experimental Measurements ◽  
Zone Plates ◽  
Wide Range ◽  
High Wavelength ◽  
Good Agreement

In this work, we present a thorough analysis on M-bonacci zone plates for ultrasound focusing applications. These planar lenses are capable of providing bifocal focusing profiles with equal intensity in both foci and become very appealing for a wide range of scenarios including medical and industrial applications. We show that in high-wavelength domains, such as acoustics or microwaves, the separation between both foci can be finely adjusted at the expense of slightly increasing the distortion of the focusing profile, and we introduce a design parameter to deal with this issue and simplify the design process of these lenses. Experimental measurements are in good agreement with numerical simulations and demonstrate the potential of M-bonacci lenses in ultrasound focusing applications.

New hail impact simulation models on composite laminated wing leading edge

2019 ◽  
Vol 91 (3) ◽  
pp. 457-465 ◽  
Author(s):  
Kamila Kustron ◽  
Vaclav Horak ◽  
Radek Doubrava ◽  
Zdobyslaw Jan Goraj
Keyword(s):  
Numerical Simulations ◽  
Design Process ◽  
High Speed ◽  
Cost Effective ◽  
Sandwich Composite ◽  
Content Type ◽  
Convenient Tool ◽  
Impact Tests ◽  
Local Strength ◽  
Hail Impact

Purpose The risk of hail-impact occurrence that can decrease local strength property must be taken into account in the design of primary airframe structures in aviation, energy and space industries. Because of the high-speed of hail impact in operation, it can affect the load carrying capacity. Testing all impact scenarios onto real structure is expensive and impractical. The purpose of this paper is to present a cost-effective hybrid testing regime including experimental tests and FEM-based simulations for airframe parts that are locally exposed to the impacting hail in flight. Design/methodology/approach Tested samples (specimens) are flat panels of laminated and sandwich carbon/epoxy composites that are used in designing lightweight new airframes. The presented numerical simulations provide a cost effective and convenient tool for investigating the hail impact scenarios in the design process. The smoothed particle hydrodynamics (SPH) technique was selected for the simulation of projectiles. The most commonly used shape of projectiles in hail impact tests is the ice ball with a defined diameter. The proposed simulation technique was verified and validated in tests on flat composite panels (specimens). Findings Integration of the numerical analyses with high-speed impact tests of hail onto flat laminated and sandwich composite shells has been presented, and a developed simulation model for impact results assessment was obtained. Originality/value The tested coupons (specimens) are flat panels as representative of structural design deployed in real aircraft structures. These numerical simulations provide a cost effective and convenient tool for hail impact scenarios in the design process.

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