基于动力学分析方法的柴滤支架断裂问题研究

对柴滤系统进行了振动扫频试验,发现当激励载荷过大时,柴滤系统安装刚度的变化会导致谐振频率产生变化。使用仿真方法进行了柴滤系统的安装刚度对自身模态的影响分析。通过振动试验与仿真分析,认为动力学分析方法是解决柴滤系统振动破坏的一种有效方法,同时柴滤系统的安装固定方式需要引起重视。

集成式柴滤及手油泵在柴油车低压油路中的应用

通过改进低压油路中柴滤滤芯和手油泵内部结构,并将柴滤与油水分离器集成在一起,优化手油泵布置位置,以达到降低成本、解决起动困难及方便维修的目的。

Endpoint forecasting on composite regeneration by coupling cerium-based additive and microwave for diesel particulate filter

Numerical simulation has been carried out to investigate the major factors affecting the time of composite regeneration due to coupling cerium-based additive and microwave for diesel particulate f3ilter(DPF). Effect on the composite regeneration time from various factors such as mass flow rate of exhaust gas, temperature of exhaust gas, oxygen concentration of exhaust gas, microwave power and amount of cerium-based additive are investigated. And a mathematical model based on fuzzy least squares support vector machines has been developed to forecast the endpoint of the composite regeneration. The results show that the relative error of endpoint forecasting model of composite regeneration is less than 3.5%, and the oxygen concentration of exhaust gas has the biggest effect on the endpoint of composite regeneration, followed by the mass flow rate of exhaust gas, the microwave power, the temperature of exhaust gas and the amount of cerium-based additive.

Performance evaluation on field synergy and composite regeneration by coupling cerium-based additive and microwave for a diesel particulate filter

In order to reveal the mechanics of composite regeneration by coupling cerium-based additive and microwave for a diesel particulate filter, a composite regeneration model by coupling cerium-based additive and microwave for a diesel particulate filter was established based on field synergy theory. Performance evaluation on field synergy and composite regeneration of the diesel particulate filter was conducted by using the vortex crushing combustion and field synergy mathematical models. The results show that the peak temperature of the particulate filter body reaches 1180-1190 K when the regeneration time is 175 s, and there are optimal coordination degree between the velocity vector and temperature gradient of the filter body and the maximum ratio0.56-0.60 of the best burning regeneration region is obtained. Accordingly, the largest regeneration combustion rate inside the particulate filter body and the highest regeneration efficiency at the moment are achieved.

Propagation and Attenuation Characteristics of Diesel Particulate Filter

Diesel particulate filter (DPF) is an important factor which influences the sound from exhaust system of an engine. In order to understand the propagation law of sound wave and predict the insertion loss in DPF, based on the general aero-dynamic equations and Darcy′s law, an acoustic property calculation model of DPF is constructed. Propagation and attenuation characteristics of the forward and backward propagating acoustic waves in the close and open pipe of the filter are investigated. The theoretical model is combined with experiment to investigate sound attenuation property of DPF. The insertion loss obtained from the experiment is compared with that computed for a DPF. The results from the experiment and theoretical calculation agree well.

Study on Dibehenyl Fumarate-Vinyl Acetate Copolymer for Lowering Cold Filter Plugging Point of Diesel Fuel

In the practice of petroleum industry, adding cold flow improver （CFI） to lower the fuel＇s cold filter plugging point （CFPP） is an effective and economic way for improving the cold flow performance of diesel fuel. This paper described the synthesis and evaluation of the performance of dibehenyl fumarate-vinyl acetate （FV） copolymer for improving the cold flow performance of the tested diesel fuels. The carbon distribution in n-alkanes of the tested diesel samples were analyzed by gas phase chromatography. The structure of the copolymer was confirmed by the 1H NMR spectroscopy. The wax crystals morphologies with and without adding the FV additive were investigated by means of polarizing microscope. The test results indicated that the FV additive could depress CFPP of the tested diesel samples by 2℃ and 4℃, respectively, when dosage of the additive was 0.08 m%. The additive can modify the size and shape of the wax crystals and inhibit the formation of larger wax crystal lattices.

Improving Fuel Diesel Efficiency Using Fuel Filter

The price of fuel oil continues to rise, decreased supplies oil at the other side, both factors increase the interest of researchers to conduct research related to fuel efficiency. Therefore the aim of this study is to improve the efficiency fuel of diesel engine using fuel filter. The method used for the research is testing the most efficient fuel filters made of coil wire coil winding 5,000, the three distinguished from the coil core diameter of 44.5, 28.5 and 17.5 mm in diesel engine. The performance test was conducted from 1,100 rpm to 1,700 rpm, the throttle opening of 30%-60%. The first testing was done by creating a constant speed 1,500 rpm and throttle opening varies from 30% to 60%, further testing is done by varying the rpm start from 1,100 rpm to 1,700 rpm to make constant valve 40% and 60%.

Tropical Leachate Properties as a Growing Media for Algae as a Source of Biodiesel Production

Algae can be found in ponds, rivers, lakes, abandoned ponds and also can grow abundantly in the aged pond of leachate landfill since there is the source of sunlight, CO2 （carbon dioxide） and nutrients. Like plants, algae make their own food by photosynthesis but differ from the plant; algae do not have roots, petals, stems or leaves. Leachate is the water that contains dissolved and suspended solids resulting from the percolation of water that drains through the waste in the landfill. The constituents of the leachate include organic matters and inorganic matters which depend on the age of landfill and type of the waste. The aim of this research study is to identify the characteristics of the leachate from aged landfill that cause the growth of the algae. Metals that act as the nutrients that exist in the leachate were measured using ICP-OES （inductively coupled plasma-optical emission spectroscopy）. BOD5 （biochemical oxygen demand that is measured in 5 days） and COD （chemical oxygen demand） were measured using DO （dissolved oxygen） meter and spectrophotometer, respectively. The pH of the leachate was measured using pH meter. The results showed that the highest metal that exists in the leachate was magnesium in quantity of 8.52 ppm. BOD5 and COD of the leachate gave the results of 5.24 mg/L and 99.67 mg/L, respectively. The pH of the leachate is considered as alkaline since the value of the pH is 8.38. This indicates that the characteristics of the leachate for algae growth was aged landfill with the alkaline condition and the nutrient needed by the algae for growing is magnesium.