Design and Theoretical Analysis of Acoustic Enclosure for G12V190 Type Diesel Engine

2011 ◽  
Vol 338 ◽  
pp. 392-395
Author(s):  
Jin Sheng Ma ◽  
Na Na Dai ◽  
Yang Bo ◽  
Ling Zhou ◽  
Zi Feng Liu ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Theoretical Analysis ◽  
Theoretical Calculation ◽  
Noise Reduction ◽  
Field Test ◽  
Test Results ◽  
Reduction Effect

The existing acoustic cover is improved to reduce the noise of G12V190 type diesel engine. A panel of shutters structure is designed and simulated with SYSNOISE. The structure of acoustic enclosure is also been designed according to the structure of the diesel engine. Theoretical calculation shows that the improved insulation cover has not only a good noise reduction effect, but also has been greatly improved in terms of cooling ventilation, the field test results also shows that this section of acoustic enclosure can reduce the noise about 10dB.

Theoretical Calculation and Experimental Research on Sequential Turbocharging of a Marine Diesel Engine

2011 ◽  
Vol 305 ◽  
pp. 416-422
Author(s):  
Peng Qi Zhang ◽  
Qing Lin He ◽  
Yin Yan Wang
Keyword(s):  
Diesel Engine ◽  
Theoretical Calculation ◽  
Experimental Research ◽  
Marine Diesel Engine ◽  
Test Results ◽  
Low Load ◽  
Marine Diesel ◽  
Working Principle ◽  
Test Result

The paper introduces the working principle of the sequential turbo-charging (STC) system of multi-turbocharger. To improve low-load performance and operating economy of the 234V12 diesel engine, a STC system of multi-turbocharger for the diesel engine was designed. Theoretical calculation and experimental research was done on this improved marine diesel engine. Then, a 3-phase STC system is presented by analyzing and comparing the test result and the switching boundary of this system is confirmed. The test results show that the low-load performance is improved obviously by use of multi-turbocharger STC system.

Paper 3: The Design of a Space-Frame Crankcase for a Large Medium-Speed Diesel Engine

1966 ◽  
Vol 181 (8) ◽  
pp. 61-70
Author(s):  
G. W. Morland ◽  
B. S. Flear
Keyword(s):  
Diesel Engine ◽  
Theoretical Analysis ◽  
Noise Reduction ◽  
Design Tool ◽  
Space Frame ◽  
Medium Speed ◽  
Manufacturing Procedure ◽  
Actual Design ◽  
Comparative Results ◽  
Prototype Testing

The basic arguments which led to the choice of a framed crankcase structure for a new range of in-line and Vee engines is described. The underlying principles behind the evolution of the actual design are discussed in relation to criteria for strength, stiffness, manufacturing procedure, and noise reduction. The relative merits of underslung crankshaft and bedplate types of structure are discussed, and the programme of model and prototype testing which led, together with manufacturing considerations, to a decision between the two is described. Extensive model and prototype testing, in conjunction with theoretical analysis, was used as a major design tool and to prove the design. This is described in some detail and comparative results presented and discussed.

Supercharging of a Large Two-Cycle, Loop-Scavenged Diesel Engine

1961 ◽  
Vol 83 (2) ◽  
pp. 206-213
Author(s):  
A. J. Henriksen
Keyword(s):  
Diesel Engine ◽  
Field Test ◽  
Theoretical Approach ◽  
Power Output ◽  
Thermal Efficiency ◽  
Test Results ◽  
Thermodynamic Work ◽  
Supercharged Engine

The paper covers the mechanical and thermodynamic aspects of increasing the power output and thermal efficiency of an existing nonsupercharged two-cycle, loop-scavenged diesel engine through supercharging. The power output was increased by 40 per cent and the thermal efficiency by approximately 4 per cent. Much of the thermodynamic work was done on a UNIVAC computer and a brief description of the theoretical approach and results appear in this paper. Field test results from a Nordberg two-cycle, 21 1/2-in. × 31-in. supercharged engine are also included in this paper.

scholarly journals Examination of Rail Dampers with Respect to Noise and Vibration Mitigation

2020 ◽  
Author(s):  
Gabriella Csortos ◽  
Fülöp Augusztinovicz ◽  
László Kazinczy
Keyword(s):  
Noise Reduction ◽  
Field Measurements ◽  
Vibration Damping ◽  
Mode Shapes ◽  
Vibration Energy ◽  
Test Results ◽  
Railway Transport ◽  
Noise And Vibration ◽  
Reduction Effect ◽  
Rolling Noise

Nowadays there are more and more possibilities to mitigate noise and vibration emitted by railway transport to the lower levels. Among them, rail dampers with highly viscous properties placed on the rail web, fixed with adhesives or other methods, appeared as a new element in the railway superstructure. The elements are applied to reduce noise and vibration by transforming the vibration energy of the rail web into heat, through their large internal friction. Many companies produce rail web elements and apply them with success abroad. Domestic manufacturers have already appeared in Hungary; however, the installation of these elements is still very limited. This publication is intended to introduce the rail dampers and to demonstrate their efficiency through laboratory and field measurements. Experimental modal analysis was used during the laboratory test to determine the eigenfrequencies, the damping factors and the mode shapes of an experimental rail section, thus analyzing the vibration damping and noise reduction effect of the elements. Field measurements were also carried out at a segment installed with rail web elements in Hungary and its vicinity, under standardized conditions. By averaging measured noise level values for various types of trains, comparable noise reduction of the investigated rail web element can be achieved. The laboratory and field test results confirmed that the rail web elements can be suitable for rolling noise reduction and vibration damping in most of the cases. The results of the measurements provide guidance and information for future development of the elements.

Experimental investigation of applying miller cycle to reduce NOx emission from diesel engine

2005 ◽  
Vol 219 (8) ◽  
pp. 631-638 ◽  
Author(s):  
Y Wang ◽  
S Zeng ◽  
J Huang ◽  
Y He ◽  
X Huang ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Diesel Engine ◽  
Nitrogen Oxides ◽  
Emission Reduction ◽  
Miller Cycle ◽  
Test Results ◽  
Test Rig ◽  
Dual Cycle ◽  
Reduction Effect ◽  
Engine Type

An experimental investigation of nitrogen oxides (NOx) emission reduction from a diesel engine using the Miller cycle was carried out. A Lister-Petter diesel engine, type TS2, was used for the experiments. Three versions of Miller cycles were designed and realized on a diesel engine. A series of tests were carried out on the test rig to compare the performances and emissions of the original engine (standard dual cycle) with those of the three versions of Miller cycles. The test results from the standard dual cycle and from the three versions of Miller cycles showed that applying Miller cycle to the diesel engine could reduce the NOx emission from the diesel engine. The reduction ratios of NOx for the Miller cycles are from 4.4 to 17.5 per cent. The best reduction effect is Miller cycle 1 and the reduction rates of NOx are from 11.0 to 17.5 per cent.

scholarly journals Pavement and Noise Reduction Performance of Open-Graded Asphalt Friction Course Improved by Waste Tire Crumb Rubber

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Ya Wang ◽  
Xianguang Wang ◽  
Liwen Zhang
Keyword(s):  
Noise Reduction ◽  
Resilient Modulus ◽  
Rubber Particle ◽  
Asphalt Mixture ◽  
Crumb Rubber ◽  
Test Results ◽  
The Road ◽  
Open Graded Friction Course ◽  
Road Performance ◽  
Reduction Effect

To further reveal the road performance and noise reduction performance of open-graded friction course (OGFC), the crumb rubber prepared by adding waste tires were considered, and the performance requirements of the material were put forward. To avoid the influence of rubber particle swelling on aggregate, the special gradation and mix proportion of OGFC mixture were designed, and the particle size of 4.75 mm was proposed as the control size. The test results show that the aggregate forms a good embedded structure. The resilient modulus, deformation performance, and fatigue performance of R-OGFC asphalt mixture with different crumb rubber contents were studied. According to the test results, the rubber particle content under the best road performance and noise reduction effect was proposed. The results show that, after adding a certain amount of crumb rubber, the performance of asphalt mixture has been greatly improved, especially the dynamic stability has been improved by 84%. Although the resilient modulus has decreased by 10%, the creep performance has decreased by 37%, and the fatigue life has decreased by 31% (2% rubber content), the noise reduction can reach 3.6–8.6 dB, and the noise reduction performance is significant. This shows that the best content of rubber particles is between 1.5% and 2%, and the R-OGFC mixture modified by rubber has a good application prospect.

scholarly journals Field Measurements for Traffic Noise Reduction in Highway Tunnels Using Closed-Cell Aluminum Foam Board

2022 ◽  
Vol 12 (2) ◽  
pp. 538
Author(s):  
Zanquan Lin ◽  
Weipeng Gong ◽  
Li Wan ◽  
Jiajia Shen ◽  
Hu Zhang ◽  
...  
Keyword(s):  
Noise Reduction ◽  
Field Test ◽  
Sound Source ◽  
Sound Absorption ◽  
Aluminum Foam ◽  
Test Method ◽  
Source Condition ◽  
Mobile Vehicle ◽  
Closed Cell ◽  
Reduction Effect

In order to explore the sound absorption and noise reduction performance of closed-cell aluminum foam in the tunnel, the field test of the sound absorption performance of aluminum foam board was carried out based on the installation of aluminum foam board in the whole line of Haoshanyu Tunnel on Qinglan Expressway. Combined with the existing loudspeaker test and typical tunnel measurements, a new field test method for the noise reduction performance of closed-cell aluminum foam board was proposed for two different working conditions including fixed-point pure tone sound source condition and mobile vehicle sound source condition. The testing results of the new methods were analyzed, and it showed that the closed-cell aluminum foam has good sound absorption property at the frequency spectra between 250 Hz and 1000 Hz, and the farther away from the sound source, the better the sound absorption effect. In the research on the noise reduction effect of actual vehicle, it was found that the insertion loss of the closed-cell foam aluminum board is about 4 dB(A), which indicated that the closed-cell aluminum foam can play a certain noise reduction effect in the tunnel.

Long Term Field Test Results of Experimental EPDM and PUF Roofing

1990 ◽  
Author(s):  
David M. Bailey ◽  
Stuart D. Foltz ◽  
Myer J. Rosenfield
Keyword(s):  
Field Test ◽  
Test Results ◽  
Term Field
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