Conference Paper

A New Bone Implant Concept: AMPLIFIX - First Numerical Results of Dynamic Osseointegration Simulation

May 2013

Conference: 18th International Symposium on Computational Biomechanics in Ulm (CBU 2013)
At: Ulm

Authors:

Lucas Engelhardt

Ulm University

Frank Niemeyer

OSORA medical GmbH

Frank Heuer

ORTHO HUB VENTURES

Frank Trautwein

ACES Ing.-GmbH

Show all 5 authorsHide

ResearchGate has not been able to resolve any citations for this publication.

A numerical model of the fracture healing process that describes revascularization and tissue development

Article

Full-text available

Jan 2010
COMPUT METHOD BIOMEC

Article

Research of Feature Recognition Method Based on STEP-NC

August 2012 · Advanced Materials Research

To achieve the numerical control (NC) system based on the standard for the exchange of product model data-numerical control (STEP-NC), the feature concept and feature recognition method of STEP-NC is proposed. The meaning of feature in STEP-NC, while the three classification methods of STEP-NC feature were also presented. The expression methods of STEP-NC feature were analyzed in details. ... [Show full abstract] Furthermore, the feature recognition methods based on above the analyse were described. Finally, we simulate several machining features on STEP-NC milling simulation system. The simulation results demonstrate that the feature recognition method is correct and feasible.

Article

Analytical analysis on natural frequency splitting of rotationally periodic structure with grouped f...

May 2012 · Journal of Tianjin University Science and Technology

The rotationally periodic structure with grouped features can be found in numerous engineering applications. The dynamic characteristic of this kind of structure was analytically investigated. A new concept of equivalent feature was introduced, which could be used to predict the frequency splitting behavior of the structure. The effect of the feature topology on the modal properties was examined ... [Show full abstract] by using the direct perturbation method. And the relationships between the topology of the sub-feature and the natural frequency splitting were obtained, which presented a simple rule governing the elimination of the frequency splitting. The main results could be applied to some important engineering applications such as the ultrasonic motors and vibratory gyroscopes heavily affected by the natural frequency splitting. The splitting behaviors were verified by the simulation results.

Article

Full-text available

Concept and numerical simulations of a widely tunable GaAs-based sampled-grating diode laser emittin...

January 2017 · IET Optoelectronics

Tunable diode lasers are essential components in various optical systems. The authors present a concept and simulations of a four-section, widely tunable GaAs-based sampled-grating (SG) distributed-Bragg reflector (DBR) laser emitting at 976 nm. This work includes the design approach of the SG reflectors and the simulation of the behaviour of the modes in the active cavity during the wavelength ... [Show full abstract] tuning process. Parameters such as the lasing wavelength, threshold current and the gain of the lasing and of the adjacent side modes during the tuning are presented. The numerical results presented suggest a tunability of at least 17 nm, with a threshold current change of only 2.5 mA and single-mode operation over the entire tuning range, without the need of simultaneous adjustments of the phase section. Finally, the authors present early experimental results of a developed GaAs-based vertical structure, providing a high coupling coefficient of κ = 240 cm⁻¹, thus suitable for implementation of an SG-DBR laser design.

View full-text

Chapter

Average Value at Risk in Fuzzy Risk Analysis

October 2009

Jin Fang Peng

The average value at risk (AVaR) is a risk measure which is a superior alternative to value at risk (VaR). In this paper, we present the average value at risk method for fuzzy risk analysis. Firstly, we put forward the new concept of the average value at risk based on credibility theory. Next, we examine some properties of the proposed average value at risk. Then, a kind of fuzzy simulation ... [Show full abstract] algorithm is given to calculate the average value at risk. Finally, numerical example is provided. The proposed average value at risk can be applied in many real problems of fuzzy risk analysis.

Article

Simulating Urban Dynamics Using Cellular Automata

January 2008

Xia Li

This chapter introduces the concepts of cellular automata (CA) which have been increasingly used for simulating urban dynamics. Simulation and prediction of urban evolution can provide the useful inputs to crime models. However, calibration of urban cellular automata is crucial for simulating realistic cities. Simulation of multiple land use changes using CA is difficult because numerous spatial ... [Show full abstract] variables and parameters have to be utilized. The incorporation of neural networks with CA can alleviate the calibration problems. This chapter illustrates how complex land use dynamics can be simulated by the integration of CA and neural networks.

Article

Full-text available

Regional boundary observability: a numerical approach

January 2002

In this paper we review the concept of regional boundary observability, developed in (Michelitti, 1976), by means of sensor structures. This leads to the so-called boundary strategic sensors. A characterization of such sensors which guarantees regional boundary observability is given. The results obtained are applied to a two-dimensional system, and various cases of sensors are considered. We ... [Show full abstract] also describe an approach which leads to the estimation of the initial boundary state, which is illustrated by simulations.

View full-text

Article

Extended Boussinesq equations model for wave propagation on currents

January 1999

A wave-current model is presented for the simulation of wave characteristics in presence of preexisting current field. A new dispersion relation is derived for the wave-current combined phenomenon and wave-current interactions are simulated by considering Madsen et al. (1991, 1992) extended Boussinesq equations. The model is applied to a variable water depths for both following and adverse ... [Show full abstract] currents, and numerical results are compared with direct experiments and analytical wave-current theory. Concept of equivalent uniform current (Hedges and Lee, 1992) is adopted for the simulation of real current field.

Article

Turbulence Simulation on Sparse Grids using the Combination Method

April 1997

Michael Griebel

this paper, we study the parallel numerical solution of the Navier-Stokes equations with the sparse grid combination method. This algorithmic concept is based on the independent solution of many problems with reduced size and their linear combination. We describe the algorithm for three-dimensional problems and we report on its application to turbulence simulation. Furthermore, statistical ... [Show full abstract] results on a pipe flow for Reynolds number Re cl = 6950 are presented and compared to results obtained from other numerical simulations and physical experiments. 1. Summary

Article

Full-text available

Synthesis and Design of Passive Runge-Kutta Methods

December 2001 · AEU - International Journal of Electronics and Communications

Recently, the concept of passive Runge-Kutta methods for numerical integration has been presented. With the fundamental theory thus provided, the goal of this paper is to cover some of the aspects relevant for an actual implementation of the methods derived. For this, procedures for the synthesis of corresponding wave flow diagrams are developed. Some design examples for PDIRK methods are given. ... [Show full abstract] Finally, a simulation example is presented in order to verify the functionality of the methods derived.

View full-text

Article

Review of propulsion applications and numerical simulations of the pulsed detonation engine concept

November 1991 · Journal of Propulsion and Power

Here we review experimental and computational studies of the pulsed detonation engine concept (PDEC) and present results of our recent numerical study of this concept. The PDEC was proposed in the early 1940s for small engine applications; however, its potential was never realized due to a complicated, unsteady operation regime. In this study, we demonstrate the use of current advances in ... [Show full abstract] numerical simulation for the analysis of the PDEC. The high-thrust/engine volume ratio obtained in our simulations demonstrates promising potential of the pulsed detonation engine concept.

Article

Qualitative dynamic analysis of homogeneous azeotropic distillation columns

June 2001 · IFAC Proceedings Volumes

In this paper, the stability and dynamic behavior of homogeneous azeotropic distillation columns is studied with two novel tools that are based on a qualitative approach. Both methods analyze the dynamic behavior of column profiles after perturbations. The advantage of the proposed approaches is that they provide insight without detailed column simulations. In addition, they allow more general ... [Show full abstract] conclusions as they are not restricted to specific sets of operating conditions. The key concept of both analysis is to study the interaction of changes in the total column holdup and the shape of the column profile. This allows one to determine if the profiles are locally stable or unstable. While the first method is purely qualitative and can easily be generalized for predictions, the second method shows how it can be augmented with a numerical approach for analyses of specific cases.

Conference Paper

A Novel Concept Towards the Reduction of Helicopter Blade-Vortex Interaction: A Numerical Study Usin...

June 2009

Marcel Ilie

A novel technique regarding the reduction of the influence of helicopter blade-vortex interaction on the aerodynamic coefficients is proposed. The proposed technique is based on the idea of injecting air at the leading edge of the blade to alter the characteristics of the vortex. The numerical investigations are performed using the large-eddy simulation (LES) approach. The simulations were ... [Show full abstract] performed for a Reynolds number, Re = 1.3 x 10 6 , based on the NACA0012 airfoil chord and free-stream velocity. The present study shows that using the leading edge air mass injection (LEAMI) concept, the influence of blade-vortex interaction on the aerodynamic coefficients is significantly reduced.

A New Bone Implant Concept: AMPLIFIX - First Numerical Results of Dynamic Osseointegration Simulation

No full-text available

Recommended publications

Research of Feature Recognition Method Based on STEP-NC

Analytical analysis on natural frequency splitting of rotationally periodic structure with grouped f...

Concept and numerical simulations of a widely tunable GaAs-based sampled-grating diode laser emittin...

Average Value at Risk in Fuzzy Risk Analysis

Simulating Urban Dynamics Using Cellular Automata

Regional boundary observability: a numerical approach

Extended Boussinesq equations model for wave propagation on currents

Turbulence Simulation on Sparse Grids using the Combination Method

Synthesis and Design of Passive Runge-Kutta Methods

Review of propulsion applications and numerical simulations of the pulsed detonation engine concept

Qualitative dynamic analysis of homogeneous azeotropic distillation columns

A Novel Concept Towards the Reduction of Helicopter Blade-Vortex Interaction: A Numerical Study Usin...