This study analysed the characteristics of the fuel system of a self-ignition engine with electronic control, taking into account the characteristics of the processes in the injector and the ...injection control system. The results of simulations of hydro-mechanical processes in an injector with an electromagnetic controller are presented. The proposed model takes into account the propagation processes of the pressure impulse in the fuel and in the parts of the injector subjected to deformation during injection. To describe the elastically-deformable state of the injector parts, an equivalent model of the injector valve stem was used. The results of calculations are proposed for a common simulation of hydrodynamic and electro-dynamic processes occurring during fuel injection into the Common Rail (CR) system.
•Modification of the balancer to the rim material condition measurement system.•Health of the rim: -new and good, -used and suitable for further use, -unusable.•Processing of vibration data using ANN ...as a rim material integrity classifier.•Comparison of AHC with SOM and MLP as classifiers for the examination of the rim.
Some vehicle damages can be related to the wheels' functional state, defined by rim and tire conditions. The technical condition of the rim is not simple to identify as it is related to the state of material structure. So far, little information has been presented about measurement systems and methods dedicated to rim technical condition identification that are acceptable by car service stations. Thus, the new measurement system and method are proposed in this paper. The identification process uses forced vibration spectra measurement and data processing with neural network use. For this purpose, the existing wheel balancer has been integrated with the computer coupled to a shaft actuator, vibration exciter, and accelerometer head. The developed software provides automation of measurement procedure and results classification, while the algorithm of data processing enables the proper detection of the three states of rim: new, used, and fit for further use, and not usable.
This article presents importance of the injector nozzle geometry for performance and durability of diesel fuel system, quality of fuel spray and in-cylinder work mixture formation. Reviewed ways to ...improve its hydraulic characteristics. As prototype for investigation has used injector nozzle of the high-speed diesel 4DTNA1. The estimated volumetric models of the injector nozzle with two different flowing channels geometry was made. Got the results of the fuel flow modeling by CFD calculation. Carried out analysis of the diesel flow parameters in both geometries with searching ways to reduce hydraulic loses and cavitation erosion influence.
Vehicles with the 4WD system of different construction and functional solutions are offered by various manufacturing companies. Users of such vehicles expect continuous improvement of the efficiency ...in the field conditions while meeting at the same time the ecological requirements. Due to the high reliability and high efficiency in the field conditions the purely mechanical solution systems are often used. The article presents an analysis of the 4WD system operation which uses mechanical solution for torque distribution between drive axes. The tests were carried out on the MAHA LPS 3000 dual-axle chassis dynamometer using the registration of front and rear axle wheels driving forces and rotational speed values. During the experimental tests the vertical wheel loads as well as the tire pressures and the rolling circumferences were being changed. Analysis of the obtained results has served to make an efficiency assessment of the vehicle 4WD transmission system.
Дана праця спирається на особистий досвід автора під час гуманітарних місій та є спробою узагальнення результатів понад 1800 операцій, виконаних за останні три роки в “гарячих точках” світу.
The results of the method, of diesel injector state estimation are presented. On the basis of the hydrodynamic accumulator of the fuel supply process, there were obtained recommendations on the ...selection of design and adjusting parameters of the stand for checking the injectors. The criteria for quantitative estimation of diesel engine injector estimation are determined.
The authors overview an efficient and simple representation model of sentence semantics in the context of a paraphrase identification problem. A dependency tree is chosen as the main structure to ...represent connections between words in a sentence. To represent word semantics, pre-trained word representation models are used. Based on these two key components, several features helping to precisely identify paraphrases are designed. The conducted experiments proved this model to be efficient. The model application results are quite close to those of state-of-the-art models.
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