Noise Reduction of Low-frequency Exhaust Noise for Medium-Speed Engine Using End Reflection Effect

2021 ◽  
Vol 45 (7) ◽  
pp. 615-621
Author(s):  
Seongjong Park ◽  
Bongman Jin ◽  
Daehee Lee ◽  
Heesung Lee ◽  
Dongyeon Lee ◽  
...  
Keyword(s):  
Noise Reduction ◽  
Low Frequency ◽  
Reflection Effect ◽  
Medium Speed ◽  
Medium Speed Engine ◽  
Exhaust Noise ◽  
Speed Engine

scholarly journals Acoustic Source Data for Medium Speed IC-Engines

2012 ◽  
Vol 134 (5) ◽  
Author(s):  
Antti Hynninen ◽  
Raimo Turunen ◽  
Mats Åbom ◽  
Hans Bodén
Keyword(s):  
High Frequency ◽  
Internal Combustion Engines ◽  
Low Frequency ◽  
Acoustic Source ◽  
Ic Engine ◽  
Source Characteristics ◽  
Medium Speed ◽  
Source Data ◽  
Exhaust Noise ◽  
Ic Engines

Knowledge of the acoustic source characteristics of internal combustion engines (IC-engines) is of great importance when designing the exhaust duct system and its components to withstand the resulting dynamic loads and to reduce the exhaust noise emission. The goal of the present study is to numerically and experimentally investigate the medium speed IC-engine acoustic source characteristics, not only in the plane wave range but also in the high frequency range. The low frequency acoustic source characteristics were predicted by simulating the acoustic multiload measurements by using a one-dimensional process simulation code. The low frequency in-duct exhaust noise of a medium speed IC-engine can be quite accurately predicted. The high frequency source data is estimated by averaging the measured acoustic pressures with different methods; using the simple cross-spectra averaging method seems promising in this instance.

Ultra-low Emission Medium Speed Engine for EU Stage V

MTZ worldwide ◽  
2021 ◽  
Vol 82 (11) ◽  
pp. 46-53
Author(s):  
Daniel Peitz ◽  
Dominik Gschwend ◽  
Koen Christianen ◽  
Kati Lehtoranta
Keyword(s):  
Medium Speed ◽  
Low Emission ◽  
Medium Speed Engine ◽  
Speed Engine

scholarly journals A Numerical Study of Spray Characteristics in Medium Speed Engine Fueled by Different HFO/n-Butanol Blends

2014 ◽  
Vol 2014 ◽  
pp. 1-13 ◽  
Author(s):  
Hashem Nowruzi ◽  
Parviz Ghadimi ◽  
Mehdi Yousefifard
Keyword(s):  
Average Velocity ◽  
Numerical Study ◽  
Injection Pressure ◽  
Fuel Oil ◽  
Heavy Fuel Oil ◽  
Spray Characteristics ◽  
Good Compliance ◽  
Medium Speed ◽  
Medium Speed Engine ◽  
Speed Engine

In the present study, nonreacting and nonevaporating spray characteristics of heavy fuel oil (HFO)/n-butanol blends are numerically investigated under two different high pressure injections in medium speed engines. An Eulerian-Lagrangian multiphase scheme is used to simulate blend of C14H30as HFO and 0%, 10%, 15%, and 20% by volume of n-butanol. OpenFOAM CFD toolbox is modified and implemented to study the effect of different blends of HFO/n-butanol on the spray characteristics at 600 and 1000 bar. To validate the presented simulations, current numerical results are compared against existing experimental data and good compliance is achieved. Based on the numerical findings, addition of n-butanol to HFO increases the particles volume in parcels at 600 bar. It was also found that blend fuels increase the number of spray particles and the average velocity of spray compared to pure HFO. Moreover, under injection pressure of 1000 bar, HFO/n-butanol blends compared to pure HFO fuel decrease particles volume in parcels of spray. Another influence of HFO/n-butanol blends is the decrease in average of particles diameter in parcels. Meanwhile, the effect of HFO/n-butanol on spray length is proved to be negligible. Finally, it can be concluded that higher injection pressure improves the spray efficiency.

scholarly journals Analysing Applicability Of Selected Methods To Smooth Indicator Diagrams Of Marine Medium-Speed Engine

2015 ◽  
Vol 22 (2) ◽  
pp. 55-61 ◽  
Author(s):  
Rafał Pawletko
Keyword(s):  
Moving Average ◽  
Diagnostic Information ◽  
Pressure Curve ◽  
Filtration Method ◽  
Smoothing Methods ◽  
Medium Speed ◽  
Curve Smoothing ◽  
Medium Speed Engine ◽  
Marine Medium ◽  
Speed Engine

Abstract The article analyses the applicability of selected smoothing methods to smooth indicator diagram curves and to filter disturbances. An intermediate goal of the study was an attempt to extract disturbances recorded during pressure curve smoothing, which are believed to be a source of important diagnostic information. Within the framework of the reported analysis, a comparison was made between the moving average method, the Savitzky-Golay filter, and the frequency filtration method. The research was performed on a marine medium-speed engine Sulzer 3Al 25/30, which has a relatively long indicator passage.

scholarly journals Medium Speed Engine Crankshaft Analysis

2017 ◽  
Vol 50 (3) ◽  
pp. 341-344 ◽  
Author(s):  
Ilkka Väisänen ◽  
Antti Mäntylä ◽  
Antti Korpela ◽  
Teemu Kuivaniemi ◽  
Tero Frondelius
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Element Analysis ◽  
Medium Speed ◽  
Body Dynamics ◽  
Medium Speed Engine ◽  
Multi Body ◽  
Engine Crankshaft ◽  
Speed Engine ◽  
Bearing Analysis

This article describes the overview of crankshaft analysis of a medium speed dieselengine. Crankshaft analysis includes static analysis, crankshaft dynamics, bearing analysis, gearanalysis, and stress & fatigue analysis, the latter being in main focus in this article. AVL ExcitePower unit is used for multi-body dynamics and Abaqus for finite element analysis.

scholarly journals Performance and Emissions of a Medium-Speed Engine Driven with Sustainable Options of Liquid Fuels

2020 ◽  
Author(s):  
Seppo Niemi ◽  
Michaela Hissa ◽  
Teemu Ovaska ◽  
Katriina Sirviö ◽  
Sonja Heikkilä ◽  
...  
Keyword(s):  
Liquid Fuels ◽  
Medium Speed ◽  
Performance And Emissions ◽  
Medium Speed Engine ◽  
Speed Engine
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