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Fault of diesel engine lubrication system will affect engine performance, and diesel engine operation parameters reflect the working state of the engine. In this paper, a data-driven fault diagnosis is proposed using engine real working data. Considering the randomness and instability of the oil pressure in the lubrication system, a fault diagnosis method based on PSO-SVM model and centroid location...
In this paper, we demonstrate a dual-wavelength mode-locked thulium-doped fiber laser. The single-wall carbon nanotube is used as the mode-locker due to its large and ultrafast nonlinear optical responses. By tuning the pump power and adjusting the PC properly, stable dual-wavelength output can be achieved. The center wavelength of the dual-wavelength pulses are 1894 nm and 1907 nm, respectively....
Due to the necessity of inter-node coordination and cooperative processing, time synchronization is an important and critical issue for Wireless Sensor Networks (WSNs). Although many existing approaches have been proposed for time synchronization in WSNs, they suffer from high computational complexity, high power consumption or geographic constraints. In this paper, we propose a novel time synchronization...
In order to solve the problems of the traditional calibration way which is workload-intensive, high-cost and inefficient, the model-based calibration method has been proposed for EUP diesel engine. By means of the optimal experimental design method, the V-Optimization experiment of EUP diesel engine has been designed. And according to the statistical modelling method, the two-stage statistical model...
In recent years, a significant interest in hybrid electric power unit has arisen globally due to its reliability and efficiency. This paper will discuss the benefits of using advanced thermal management systems in hybrid electric drivetrain, and the different control strategies that can be used to enhance system performance. A detailed one dimensional (1D) simulation model for power split hybrid electric...
An opposed-piston two-stroke engine has been investigated. A singer cylinder engine mode has been built to research the scavenging performance at different scavenging pressure and engine performance at full load. The result shows that, scavenging performamce influence by engine speed and trapping ratio and opposed-piston get higher break efficiency because of the lower heat transfer loss and higher...
A simple optical fiber relative humidity (RH) sensor was proposed and demonstrated. The humidity sensor was fabricated by coating moisture-sensitive film on the end face of a multi-mode optical fiber. The film was synthesized by doping CoCl2 into a PVA/SiO2 composite solution. Based on an optical absorption technique, the sensor head was characterized. From the optical absorption, a relative humidity...
A temperature probe of tapered fiber which is coated with a sol-gel thin films entrapped quantum dots (QDs) is presented. The QDs were trapped into sol-gel and the tapered optical fiber was coated. The change in photoluminescence (PL) intensity is appreciable, linear, and reversible (1%/°C) for temperature changing.
Power pack of vehicle consists of many different kinds of subsystems, which are coupled with complex dynamic interactions. To obtain the goal of synthesis performance of vehicle, the different disciplinary simulation models should be integrated with other vehicle components in a complete vehicle simulation to implement system-level dynamic simulation of power pack. In order to couple the different...
This paper mainly discusses the track correlation problem for the distributed multi-sensor multi-target tracking system. Target track data sequence can be seen as a signal in a certain period of time. In the point of signal processing, the signal can be divided into low-frequency and high-frequency two parts, low-frequency represents the overall trend of the signal, and high-frequency can be seen...
An organic material, 4,5-bis(benzoylthio)-1,3-dithiole-2-thione (BBDT), was synthesized. The thin film of BBDT doped into poly(methyl methacrylate) (PMMA) was prepared using spin-coating method. Its linear optical properties were characterized with prism coupler (SPA-4000, Korea). The third-order nonlinear optical (NLO) properties were investigated using Z-scan technique with pulses of picoseconds...
An organic polymer composite film, BBDT/PMMA, was prepared. Its linear and nonlinear optical properties were characterized using prism coupler(SPA-4000, Korea) and Z-scan technique. The results show that the film exhibits a great nonlinear optical response.
A dmit2- salt ([(C4H9)4N]Au(dmit)2) was synthesized and its acetone solution's third-order nonlinear optical properties were investigated by Z-scan technique using a pulsed laser with 28 ps duration and 10 Hz repetition at 532 nm. The second-order hyperpolarizability for its molecular was estimated to be as large as 2.74×10−31 esu.
A dmit2- salt: [(C4H9)4N]Au(dmit)2 was synthesized. Its third-order nonlinear optical properties of its acetone solution were investigated by Z-scan technique using a pulsed laser with 28 ps duration and 10 Hz repetition at 532 nm. The third-order nonlinear refractive index n2 and nonlinear absorption coefficient β of the sample solution were obtained to be about 4.997×10−12 esu and 1.818 cm/GW at...
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