Browse Topic: Marine vehicles and equipment

Items (303)
JAX9900
Active Safety Systems Standards Committee
Verifying large alternate product code for an Surface Vehicle RP document - JRP001
Active Safety Systems Standards Committee
Verifying large alternate product code for an JA GV document - JA1124XX
Active Safety Systems Standards Committee
This SAE Recommended Practice establishes the procedure for measuring the sound level of recreational motorboats in the vicinity of a shore bordering any recreational boating area during which time a boat is operating under conditions other than stationary mode operation. It is intended as a guide toward standard practice and is subject to change to keep pace with experience and technical advances.
Marine Technical Steering Committee
NH 3 Sensor Measurements in Different Engine Applications2018-01-18149/10/2018
In this study the exhaust gas ammonia (NH3) concentrations from different exhaust sources were measured with an ammonia sensor. The aim of the study was to verify whether an NH3 sensor has the potential to be used for monitoring and control purposes for SCR systems. Measurements were performed in laboratory and field conditions and comparison was made between Fourier Transform Infrared (FTIR) and Laser Diode Spectrometer (LDS) measurement techniques. With heavy-duty vehicles, a comparison between an LDS, FTIR and NH3 sensor was performed on a heavy-duty chassis dynamometer. Measurements were performed at steady speeds using a World Harmonized Vehicle Cycle (WHVC) and Braunschweig test cycles. The urea injection rate for the SCR system was varied to generate different ammonia levels in the exhaust gas. NH3 measurements with FTIR and NH3 sensor were performed on large cruise ships using heavy fuel oil (HFO) and marine gas oil (MGO) as fuels. Also, long-term trials on two cruise ships were conducted using heavy fuel oil and low sulphur (S < 0.1%) residual fuel. The results indicate that the NH3 sensor has the potential for being used in different applications for monitoring and controlling the SCR system. Measurement results with the sensor were in good correlation with LDS and FTIR techniques and, in dynamic measurements, the sensor response was very fast.
Murtonen, TimoVesala, HannuKoponen, PaiviPettinen, RasmusKajolinna, TuulaAntson, Olli
An Optical Study on the Combustion of Gasoline/PODEn Blends in a Constant Volume Vessel2018-01-17489/10/2018
Polyoxymethylene dimethyl ethers (PODEn) have high cetane number, high oxygen content and high volatility, therefore can be added to gasoline to optimize the performance and soot emission of Gasoline Compression Ignition (GCI) combustion. High speed imaging was used to investigate the spray and combustion process of gasoline/PODEn blends (PODEn volume fraction 0%-30%) under various ambient conditions and injection strategies in a constant volume vessel. Results showed that with an increase of PODEn proportion from 10% to 30%, liquid-phase penetration of the spray increased slightly, ignition delay decreased from 3.8 ms to 2.0 ms and flame lift off length decreased 29.4%, causing a significant increase of the flame luminance. For blends with 20% PODEn, when ambient temperature decreased from 893 K to 823 K, the ignition delay increased 1.3 ms and the flame luminance got lower. When increasing the injection pressure, the liquid phase length and the ignition delay got a little longer and the flame luminance and flame duration decreased. Long spray results showed that soot formed in higher PODEn flames oxidized earlier and quicker. The parameter changes that can extend the ignition delay all gave rise to the decrease of flame luminance because of the increase of the proportion of premixed combustion.
Ma, YueCui, LongxiMa, XiaoWang, ZhiShuai, Shi-Jin
An Experimental Investigation on Spray Mixing and Combustion Characteristics for Spray C/D Nozzles in a Constant Pressure Vessel2018-01-17839/10/2018
The Engine Combustion Network (ECN) is a coordinate effort from research partners from all over the world which aims at creating a large experimental database to validate CFD calculations. Two injectors from ECN, namely Spray C and D, have been compared in a constant pressure flow vessel, which enables a field of view of more than 100 mm. Both nozzles have been designed with similar flow metrics, with Spray D having a convergent hole shape and Spray C a cylindrical one, the latter being therefore more prone to cavitation. Although the focus of the study is on reacting conditions, some inert cases have also been measured. High speed schlieren imaging, OH* chemiluminescence visualization and head-on broadband luminosity have been used as combustion diagnostics to evaluate ignition delay, lift off length and reacting tip penetration. Parametric variations include ambient temperature, oxygen content and injection pressure variations. Results extend the range of variation of previously reported experiments in the literature for such nozzles, showing good agreement with such previous results and enlarging the available database for CFD validation. A systematic shorter lift-off length is observed for Spray C, while ignition delay from broadband luminosity and schlieren visualization show no clear difference between both nozzles. Comparison against literature results from Spray A has also been performed, from which behavior of the larger nozzles is seen to be highly affected by the slower mixing process.
Pastor, Jose V.Garcia-Oliver, Jose MGarcia, AntonioMorales López, Andrés
To meet future particulate emission limits is quite ambitious for gasoline engines working with direct injection. It was found that there is a relationship between the fuel deposited on the combustion chamber surfaces due to spray impingement and the soot emissions. To understand and avoid the fuel film formation, measurements of the fuel film thickness and mass are important. However, in practical applications fuel films in general are not always problematic as long as they evaporate in time before ignition. Therefore, a systematic investigation of the evaporation duration of fuel film resulting from spray/wall interaction using high-speed visualization was performed. The investigation focused on the influence of engine related operating parameters on the film evaporation duration under the typical homogeneously charged gasoline engines conditions. To distinguish the effects of different operating parameters on the evaporation duration, the measurements were performed inside a conditioned pressure vessel. By varying the vessel pressure, vessel temperature and rail pressure a wide range of injection conditions were studied. The spray was generated by a standard high-pressure, six-hole nozzle. The measurements were carried out using three liquid fuels (gasoline, iso-octane and a 3-component surrogate fuel), to investigate the effect of the fuel on film evaporation. The resulting evaporation durations of iso-octane were discussed using the results of laser-induced fluorescence measurements of the corresponding film masses. It was found that under several conditions, the evaporation duration does not correlate with the values of the deposited film mass. Hence, smaller amounts of fuel deposited as film do not necessarily lead to shorter evaporation times. Additionally, it is shown that the 3-component fuel used in the measurements can be recommended as gasoline surrogate in measurements and simulations, as the evaporation duration agrees well with that of gasoline.
Schulz, FlorianBeyrau, Frank
Study on a Fuzzy Q-Learning Approach Using the Driver Priori Knowledge for Intelligent Vehicles’ Autonomous Navigation and Control2018-01-10844/3/2018
The functional elements of decision making system are fuzzy, adaptive and self-learning for intelligent ground vehicles. As is well-known, operating environment of unmanned ground vehicles (UGVs) is complex, unknown and time-changing. And on the other hand, exact dynamic model of the vehicle is relatively difficult to gain. However, the changing of special dynamic parameters and the man-made driving laws of velocities and running direction are easily available. Therefore, this paper attempts to provide an approach based on fuzzy Q-learning algorithm for studying autonomous navigation and control system’s design, which aims to make unmanned vehicles adaptive and robust under complex and time-changing environment. The presented approach utilizes the drivers’ empirical knowledge for. Fuzzy inference system introduces the human beings’ successful experiences into the system, and Q-learning mainly pays more attention to the interaction between the robot and the environment and thus keeps on learning until achieving the goal. Through this method, autonomous navigation and control system can be designed accordingly. This paper used a type of the nonholonomic robotic system for the computational experiments so as to verify the algorithm, which only considers necessary candidate conclusions. The final simulation results show the validity of the designed algorithm. The presented algorithm is not dependent on the dynamic model, and is designed in terms of the special model parameters. Therefore, the mentioned approach has strong versatility and transplantable, which can be easily used for penetration maneuver strategies and autonomous maneuver of other type of intelligent vehicles such as unmanned aerial vehicles (UAVs) or autonomous underwater vehicles (AUVs).
Chang, LiangBai, JieHuang, Liangbo
Qualified Hoses for Marine ApplicationsJ1942/1_201712 (Historical)12/27/2017
The following list consists of hose data provided as of December 2017, and is for convenience in determining acceptability of nonmetallic flexible hose assemblies intended for usage under 46 CFR 56.60-25. Where the maximum allowable working pressure (MAWP) or type of fitting is not specified, use the manufacturer's recommended MAWP or type of fitting. This list has been compiled by SAE Staff from information provided by the manufacturers whose product listings appear in this document. Manufacturers wishing to list their products in this document shall: a. Successfully test their hose to the requirements of SAE J1942, Table 1. b. Submit a letter of certification to the SAE J1942 test requirements for each specific type of hose tested (see sample table on page 4) along with the test results. All sizes should be included in the same letter which must also include all of the information necessary to make a SAE J1942-1 listing. c. The SAE will review the letter and may, at their discretion, request to see further test results. A copy of the submittal letter marked “Accepted for Listing” will be returned to the applicant upon approval. d. The cutoff date for inclusion of a hose listing in the annual SAE Handbook is September 30, of the preceding year. However, listed hoses may be used on vessels as soon as the “Accepted for Listing” letter is issued by the SAE. Next publication of this listing is scheduled to take place in December 2018. If you wish to include additional hoses in the 2018 publication of this list, please submit your Certified List to SAE by September 2018.
Hydraulic Hose and Hose Fittings Committee
Simultaneous Measurement of the Flame Lift-Off Length on Direct Injection Diesel Sprays Using High Speed Schlieren Imaging and OH Chemiluminescence2017-01-230710/8/2017
Lift-off length is defined as the distance from injector hole to the location where flame stabilized on a high injection pressure direct injection (DI) diesel spray. In this paper we used the high-speed (40 kHz) Schlieren and time-averaged OH chemiluminescence imaging technique to simultaneously measure the flame lift-off locations on a DI diesel spray in an optically accessible and constant-volume combustion vessel. The time-resolved development of the diesel spray acquired from the high-speed Schlieren imaging system enabled us to observe the instantaneous spray structure details of the spray flames. The OH chemiluminescence image obtained from a gated, intensified CCD video camera with different delay and width settings was used to determine the quiescent lift-off length. Experiments were conducted under various ambient temperatures, ambient gas densities, injection pressures and oxygen concentrations. From the Schlieren images of the injecting procedure, along the axis of the spray from the injector hole, a distinct expansion located in the downstream, after which the edge of the spray changed to transparent gradually and the refractive index gradients started to diminish. This point was defined as the flame location of high-speed Schlieren and the length from it to the injector was employed as the lift-off length. It is found that the Schlieren imaging lift-off length fluctuated within a certain range during the injection process, and the average lift-off length of quiescent conditions was also measured based on the OH chemiluminescence image. The results of the high-speed Schlieren imaging coincided well with the lift-off length results acquired from the CCD results, indicating high-speed Schlieren imaging technique can be used to measure the flame lift-off length on DI diesel spray.
Wei, YijieLi, TieWang, BinShi, Weiquan
Iso-Octane Spray from a GDI Multi-Hole Injector under Non- and Flash Boiling Conditions2017-01-231910/8/2017
GDI injection systems have become dominant in passenger cars due to their flexibility in managing and advantages in the fuel economy. With the increasingly stringent emissions regulations and concurrent requirements for enhanced engine thermal efficiency, a comprehensive characterization of the fuel spray behavior has become essential. Different engine loads produce in a variety of fuel supplying conditions that affect the air/fuel mixture preparation and influence the efficiency and pollutant production. The flash boiling is a particular state that occurs for peculiar thermodynamic conditions of the engine. It could strongly influence the mixture in sub-atmospheric environments with detrimental effects on emissions. In order to obtain an in-depth understanding of the flash boiling phenomena, it is necessary to study the parameters influencing the mixture formation and their appearance in diverse engine conditions. The objective of this study is to investigate the effect of the ambient pressure and temperature on the morphology of a multi-jet spray operating in flash boiling status using a Gasoline Direct Injection setup. An eight-hole, GDI injector from the Engine Combustion Network (ECN), was investigated under flashing and non-flashing conditions. The experiments were performed in an optically-accessible, constant-volume vessel at engine-like conditions. A hybrid optical setup, Z-type schlieren and Mie scattering, using a high-speed C-Mos camera allowed the quasi-simultaneous acquisition of both the vapor and the liquid phases. A customized image-processing procedure, developed in Matlab environment, was used to outline the contours of both the fuel phases. Different morphologies of the fuel spray were studied as function of the injection pressure, the fuel temperature, and the backpressure in the vessel, through the measurement of the axial penetration and cone angle.
Montanaro, AlessandroAllocca, LuigiLazzaro, Maurizio
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