Rene Christensen

Featured in: Favicon

wiley.com

arxiv.org

thelancet.com Favicon

politiken.dk Favicon

information.dk Favicon

marinelog.com Favicon

audioxpress.com Favicon

maritimeprofessional.com Favicon

onlinelibrary.wiley.com

Articles

Op-Ed: Data's growing importance for shipping in 2025

Nov 25, 2024 | marinelog.com | Rene Christensen |Heather Ervin

By Rene B. Christensen, CEO, Green InstrumentsEvery year, shipping is faced with new requirements to protect the climate and the environment, and 2025 is no exception. Increased EU requirements for documentation on methane and other emissions from ships will come into force on January 1, and right now several shipping companies are assessing what to do with the new requirements, while others have not yet realized that they are actually obliged to make an extra effort after New Year.
Simulation Techniques: Double Bass Arrays

Nov 21, 2024 | audioxpress.com | Rene Christensen

The double bass array (DBA) layout uses several subwoofers placed in a pattern, on the front and rear walls. This article explores modeling and simulation of the resulting room mode behavior, sound pressure levels, and resonances, building upon existing research (Geddes, Welti, Devantier, et al.). This article explores advanced simulation techniques to understand what truly happens in the lower frequencies domain.
OPINION: New Challenges for Shipping in 2025 Emphasize Data Importance

Nov 20, 2024 | maritimeprofessional.com | Rene Christensen

Every year, shipping is faced with new requirements to protect the climate and the environment, and 2025 is no exception. Increased EU requirements for documentation on methane and other emissions from ships will come into force on January 1, 2025, and right now several shipping companies are assessing what to do with the new requirements, while others have not yet realised that they are actually obliged to make an extra effort after New Year.
Exploring the Partial Fraction Fit Functionality in COMSOL Multiphysics®

Aug 15, 2024 | comsol.com | Rene Christensen

Today, guest blogger René Christensen of Acculution ApS discusses the Partial Fraction Fit feature, introduced in version 6.2 of the COMSOL Multiphysics® software. In version 6.2 of the COMSOL Multiphysics® software, there is a new Partial Fraction Fit function. This feature analyzes a complex-valued function of frequency given through its real and imaginary parts.
Simulation Techniques: Dimensional Reduction for Vibroacoustical Simulations

Jul 10, 2024 | audioxpress.com | Rene Christensen

As computational demands can be very high when doing simulations involving coupled physics - such as is often the case for vibroacoustical transducers - this article looks at how to reduce the computational demands and associated cost utilizing symmetry schemes and dimensional reductions techniques, and the potential associated issues.
Simulation Techniques: Acoustical Shape Optimization for Vibroacoustics Applications

Apr 24, 2024 | audioxpress.com | Rene Christensen

This article explores free-form and alternative optimization techniques where the topology of the geometry is given from the outset. Using practical examples, this article addresses shape optimization techniques, identifying useful types of boundaries and challenges to look out for audio product designs. In a previous article, it was demonstrated how formal optimization can be used for product design of audio products such as speakerphones and waveguides [1].
Simulation Techniques: Room Gain

Apr 17, 2024 | audioxpress.com | Rene Christensen

Room acoustics is often discussed in the hi-fi community, since the room where you put your loudspeakers will heavily influence the sound that reaches your ears, both at low and high frequencies. In these discussions the term “room gain” sometimes comes up.
Simulation Techniques: Acoustic Topology Optimization for Vibroacoustics Applications

Apr 10, 2024 | audioxpress.com | Rene Christensen

Acoustic topology optimization is one of the most interesting new technologies in vibroacoustics, and is a powerful tool that enables engineers to find optimal solutions to problems related to their applications. In this article, several acoustic topology optimization examples are shown. Engineering is to a large degree the combined output of education and experience.
Simulation Techniques: Loudspeaker Driver Displacement Decomposition

Oct 25, 2023 | audioxpress.com | Rene Christensen

This article offers a valuable tutorial that discusses the unique possibilities of three-dimensional analysis of loudspeaker driver displacement, using Phase Decomposition and Axial-Symmetrical Decomposition techniques. The article demonstrates how a total displacement on a cone surface can be decomposed into different components directly in the simulation software COMSOL Multiphysics, and how this can reveal some of the underlying mechanisms of the driver.
Simulation Techniques: SonicEdge Ultrasound Speaker - Modeling and Application

Sep 27, 2023 | audioxpress.com | Rene Christensen

The SonicEdge transducer - a cutting-edge microspeaker based on a unique MEMS technology that generates sound using active ultrasound modulation - introduces a completely new class of devices that can deliver constant volume velocity across audio frequencies and beyond. The article details how to model the transducer in lumped-element and finite-element acoustic simulations and how to tailor a desired SPL response using acoustic features.