Shock Test and Acceleration Analysis Methods of Marine Diesel Engines to Underwater Explosions

2013 ◽  
Vol 345 ◽  
pp. 64-67
Author(s):  
Jian Hua Zhao ◽  
Rui Bo Zhang ◽  
De Bin Zhu ◽  
Hong Bin Gao
Keyword(s):  
Diesel Engine ◽  
Low Frequency ◽  
Vibration Signal ◽  
Test Methods ◽  
Shock Acceleration ◽  
Test Results ◽  
Shock Test ◽  
Marine Diesel ◽  
Reduction Methods ◽  
Acceleration Analysis

Shock test of marine diesel engine is the important content for ship anti-shock research. Plentiful shock tests of equipments have been carried out abroad, but there is no detailed test methods of diesel engine. According to simulation results, 8-channel acceleration test points are determined. Because diesel engine is working, the measured shock acceleration is interfered by vibration signal. Orthogonal wavelet decomposition and wavelet noise reduction methods are used to separate shock component from test results. The seperated shock component consists of two parts. One is the low-frequency part caused by the shock from diesel foundation and then attenuation through the isolator, the other is the high-frequency part caused by the secondary shock of the retainer.

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.

scholarly journals An Effect of Biosolar-Water Emulsion on Small Marine Diesel Engine

2018 ◽  
Vol 6 (6) ◽  
Author(s):  
Beny Cahyono ◽  
Taufik Fajar Nugroho ◽  
Tony Bambang Musriyadi
Keyword(s):  
Diesel Engine ◽  
Engine Performance ◽  
Test Results ◽  
Gas Temperature ◽  
Water Emulsion ◽  
Light Duty ◽  
Marine Diesel ◽  
Tier 3 ◽  
Exhaust Gas Temperature ◽  
Small Capacity

This study aims to analyze the effect of water/biosolar emulsion fuel on the performance of engine diesel used in small capacity diesel engines. The fuel used is a mixture of biosolar 20% which is added 10% and 15% water (b20,WDE 10%, WDE 15%) which will be compared with dexlite fuel and biodiesel 20% (b20). Measurement of engine performance with various fuels was carried out in accordance with IMO marine engine regulation tier 3. The water-emulsified diesel could be used in the light-duty small diesel engine without modifications. The result shows that the net diesel fuel consumption and the exhaust gas temperature decreased with increasing water content of fuels over the investigated loading range.Performance produced by DWE 10% and 15% will been reduce Power, and Torque at each RPM. In detail, DWE 10% has better results than the DWE 15%. In the NOx emission test results, the use of water/biodiesel emulsified fuels 10% and 15% can reduce NOx emissions.

Mars Exploration Rover (MER) Airbag Retraction Actuator (ARA) Pyroshock Test Results

2005 ◽  
Vol 48 (1) ◽  
pp. 114-126 ◽  
Author(s):  
Kurng Chang
Keyword(s):  
Test Methods ◽  
Test Results ◽  
Mars Exploration ◽  
Flight System ◽  
Shock Test ◽  
Mars Exploration Rover ◽  
Alternate Test ◽  
Explosive Charges ◽  
Test Requirements

This paper presents the shock test results achieved in the Mars Exploration Rover (MER) airbag retraction actuator (ARA)/brush motor pyroshock qualification. The results of MER flight system pyrofiring tests are compared with ARA shock test requirements. Alternate test methods were developed in an effort to qualify critical MER equipment for adequate performance under actual flight pyroshock conditions. Simulated pyroshock qualification tests were conducted using shakers, mechanical impacts, and explosive charges for excitation. Comparisons of excitation and responses of an ARA subjected to different shock tests are presented.

Stimulation on Anti-Shock Characteristic of Diesel Engine

2013 ◽  
Vol 631-632 ◽  
pp. 920-924
Author(s):  
Min Peng
Keyword(s):  
Diesel Engine ◽  
Test Methods ◽  
Practical Significance ◽  
High Price ◽  
Performance Limits ◽  
Shock Test ◽  
The Real ◽  
Simulation Results ◽  
Virtual Platform ◽  
Shock Characteristic

With more and more attention being paid to anti-shock of the warship by many country’s navy, it is of practical significance to study the anti-shock characteristic of the diesel engine which belongs to the A class facility on warship. Owing to the high price of shock test, simulation combined with partial shock test methods are adopted by many countries to ensure the facility’s anti-shock performance. A numeric virtual platform of TBD234V6 diesel engine generator set is built by means of software MSC.ADAMS and four machine feet of the diesel engine are modeled flexibly. The virtual shock test of the generator set is conducted on this platform according to the German shock standard BV043/85 and anti-shock performance limits of the machine feet is obtained. Hammer experiment is also carried out on the real generator set. After the comparison of the simulation results and the experiment results, the deficiency aspects need to be improved are pointed out at last.

Regressive models for condition diagnosing marine diesel engine by torsional vibrations on propulsion shaft-line

2020 ◽  
Vol 34 (22n24) ◽  
pp. 2040126
Author(s):  
Do Duc Luu ◽  
Nguyen Tri Minh ◽  
Cao Duc Hanh ◽  
Nguyen Huy Hao
Keyword(s):  
Diesel Engine ◽  
Fractional Factorial Design ◽  
Vibration Signal ◽  
Fractional Factorial ◽  
Diagnostic Purpose ◽  
Marine Diesel Engine ◽  
Shaft Line ◽  
Marine Diesel ◽  
Diagnostic Signs ◽  
Factorial Design Of Experiments

This paper presents results of study in building diagnostic regressive models (RMs) of cylinders in Marine Diesel Engine (MDE) using torsional vibration signal (TVS) on the propulsion shaft-line. For diagnostic purpose, the vectors of diagnostic signs (VDS) were designed and constructed based on the features of the TVS: maxima and minima relatively with [Formula: see text] working cylinders in real-time domain, or amplitudes of [Formula: see text] first harmonics ([Formula: see text] for two-stroke MDE, and [Formula: see text] for four-stroke MDE) in frequency domain. The received RMs are equations showing the relationships between the diagnostic sign [Formula: see text], [Formula: see text] ([Formula: see text] or [Formula: see text]) of the TVS and [Formula: see text] factors [Formula: see text], [Formula: see text] which specify common states of [Formula: see text] DME’s cylinders. The factor [Formula: see text] here was calculated by using firing coefficient Cfi ([Formula: see text] = 2Cfi-1; Cfi = 0 when [Formula: see text]-cylinder is misfired, and Cfi = 1 when [Formula: see text]-cylinder is normally fired) value of each cylinder. The Fractional Factorial Design of experiments (DoE) [Formula: see text] was used to build the mentioned RMs. The MDE on MV.HR.34000 DWT, with [Formula: see text] and [Formula: see text] was observed and analyzed. The calculated linear regressive models were tested based on the [Formula: see text]-distribution standard.

TEST RESULTS FOR TOXICITY AND REDUCING TOXIC EXHAUST EMISSIONS OF THE MARINE DIESEL ENGINE

2018 ◽  
Author(s):  
Van Ha Pham ◽  
◽  
Ha Hiep Nguyen ◽  
Keyword(s):  
Experimental Investigation ◽  
Diesel Engine ◽  
Diesel Fuel ◽  
Exhaust Emissions ◽  
Marine Diesel Engine ◽  
Nox Emissions ◽  
Test Results ◽  
Test Cycle ◽  
Marine Diesel ◽  
Comparative Experimental Investigation

The tests were carried out on the marine diesel engine operating by the load characteristic in seven modes, including five modes according to the test cycle D2 regulated by ISO 8178. Based on the experimental results obtained, the specific weighted NOx emissions and their average values were calculated and compared with IMO regulations. In addition, the study carried out a comparative experimental investigation on diesel fuel and dimethyl ether, and different injector opening pressures in the marine diesel engine to reduce its toxic exhaust emissions.

scholarly journals Assessment of the technical condition of a marine diesel engine based on the analysis of the exhaust gases chemical composition

2019 ◽  
Vol 177 (2) ◽  
pp. 122-126
Author(s):  
Rafał KRAKOWSKI
Keyword(s):  
Diesel Engine ◽  
Technical Condition ◽  
Test Methods ◽  
Technical Diagnostics ◽  
Marine Diesel Engine ◽  
Exhaust Gas ◽  
Exhaust Gases ◽  
Injection Pump ◽  
Marine Engines ◽  
Marine Diesel

In the article, the concept of technical diagnostics in relation to marine engines was characterized. The compression ignition piston engine was presented as a diagnostic object. The next part of the article discusses the composition of exhaust gases with particular emphasis on compounds harmful to the environment. The available test methods for exhaust composition are also briefly described by means indication of the engine and exhaust gas analyzer. The reduction of emission of harmful compounds in the exhaust gases is also described in the article. The main part of the article presents the research object, i.e. the marine diesel engine piston and the exhaust gases analyzer, as well as tests carried out. The tests were performed for the engine in working order and inefficient condition in order to compare them with the simulated damages of injection pump and turbocharger. The article was completed conclusions.

Analisa Pengujian Repeatability Timbangan Elektronik dengan Metode Syarat Teknis Timbangan Non Otomatis dan Metode NMI Australia

2019 ◽  
Vol 4 (2) ◽  
pp. 176-183
Author(s):  
Ponco Wali
Keyword(s):  
Research Method ◽  
Test Methods ◽  
Test Results ◽  
Repeat Testing ◽  
Testing Method ◽  
Technical Requirements

Testing repeat electronic scales with non-automatic scales technical requirements so far is fairly long if not using a calculator or computer. The aim of this research is to compare the repeatability testing method of electronic scales using methods according to the technical requirements of non-automatic scales and the Australian NMI method, both of which refer to OIML R76 in determining the validity or cancellation of electronic scales repeatability testing. This research method is done through repeat testing on 3 samples of electronic scales, then on each electronic scale 2 test methods are performed. The conclusion is that the electronic scales repeatability testing uses the non-automatic scales technical requirements method and the Australian NMI method has some differences although both refer to OIML R76. These differences include several points, namely the charge used, the method of adding additions, the formula for determining electronic scales, and different test results. The Australian NMI method is deemed to make it easier and more time efficient compared to the non-automatic weighing technical requirements method.

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