OpenProp is an open-source code suite that can be used for the design, analysis, and fabrication of optimized propellers and horizontal-axis turbines. The numerical model is based on propeller lifting line theory, which is used in parametric design codes employed by the U.S. Navy as well as commercial designers. OpenProp is written in Matlab M-code, which is widely used in academia and industry...

35th ANNIVERSARY ISSUE Sinusoidal vibration testing has evolved over the years for many good reasons. Initially, from a military standpoint, a predominant part of vibration excitation was from propeller driven aircraft. Here, system resonances could easily be excited during runup, or in the more unfortunate circumstance, during sustained operation at flight speed. Although there initially was o...

Introduction: Fast Spin Echo (FSE) could suffer from the non-CPMG condition that results in destructive echo interference, unstable echo train and signal cancellation. Diffusion-weighted (DW) PROPELLER [1], an FSE-based sequence, mitigates the non-CPMG issue by XY phase cycling [1] combined with split-blade acquisition [2]. However, XY phase cycling requires refocus flip angle be close to 180° ...

BACKGROUND/AIM Since their introduction in 1991, propeller flaps are increasingly used as a surgical approach to loss of substance. The aim of this study was to evaluate the indications and to verify the outcomes and the complication rates using this reconstructing technique through a literature review. MATERIALS AND METHODS A search on PubMed was performed using "propeller flap", "fasciocuta...

This paper describes a computational procedure which is being developed for the practical analysis of propeller sheet cavitation and propeller-ship interaction including hull pressure fluctuations. The computational procedure consists of three different, coupled methods: (i) a RANS method for the analysis of the viscous flow around the ship hull and the determination of the velocity field in th...

Market demands have lead to a significant improvement of the vibration and comfort level, especially for complex ship types such as RoRo and RoPax ships. The need to optimise the design for efficiency does not allow to spend extra material with the single purpose to keep the vibration levels at the required values. The better strategy is to minimize the exciting forces as such, where the propel...

Medical microrobots have been widely used in clinical applications, particularly the spiral type locomotion mechanism, which was recently considered one of the main self-propelling mechanisms for the next medical microrobot to perform tasks such as capsule endoscopy and drug delivery. However, limits in clinical applications still exist. The spiral action of the microrobot while being used for ...

Propeller modeling in virtual captive model tests is crucial to the prediction accuracy of ship maneuvering motion. In present study, Computational Fluid Dynamics (CFD) method with two propeller methods, Sliding Mesh (SM) and Multiple Reference Frames (MRF), was used simulate for a KVLCC2 tanker model. The tests, including resistance, self-propulsion, rudder force, oblique towing, circular moti...

Propeller induced structural vibration through the thrust bearing is an important source for low frequency shipboard noise and underwater sound radiation from a submarine hull. Such vibration is investigated using a scaled experimental model. This research concentrates on the experimental characterization of propeller force, hydrodynamic force of the thrust bearing and vibration transmission th...

The effect of electron spin-rotational (SR) interaction in species with an effective spin Seff= l/Z is treated for molecular rotations representing an adiabatic perturbation to the electronic system. Based on the adiabatic rotation of effective spin (ARES) concept as well as on the transformation of the Hamiltonian to the rotating molecular frame a useful expression is obtained for the effectiv...