Engine development needs to reduce costs and time. As the current main methods, 1D simulation has limitations of low accuracy, 3D is a long, time-consuming task. Therefore, this study aims verify applicability machine learning (ML) method in prediction engine efficiency emission performance. The support vector regression (SVR) algorithm was chosen for paper. By selection kernel functions hyperparameters sets, relationship between operation parameters spark-ignition (SI) its economic...

With global warming, and internal combustion engine emissions as the main non-industrial emissions, how to further optimize power performance of engines (ICEs) has become a top priority. Since is complex nonlinear system, it often difficult from certain factor engine, various parameters are coupled with each other affect other. Moreover, traditional experimental methods including 3D simulation or bench testing very time consuming expensive, which largely affects development speed product...

Abstract The smart diesel program requires the engine electronic control unit to consider additional parameters, such as altitude and climatic conditions, in mapping calibration process. A specially designed environmental simulation cabin, which can simulate conditions at any longitude dimension, would allow dynamometer testing be performed indoors. Considering its high cost, a three-dimensional (3D) computational fluid dynamics (CFD) is needed guide and/or complement experimental...

Increasingly stringent regulations to reduce vehicle emissions have made it important study emission mitigation strategies. Highly accurate control of the air-fuel ratio is an effective way emissions. However, a less sensor can lead reduced engine stability and greater variability in efficiency Additionally, internal combustion engines (ICE) are moving toward higher compression ratios achieve thermal alleviate energy crisis. The objective this investigation was analyze significance accuracy...

The reliability of combustion chamber components is mainly determined by the thermal load diesel engines. Under plateau operation condition, engine performance degradation and ablation area appear. Therefore, it crucial to study heat transfer phenomenon at different altitudes, which Woschni formula cannot meet accuracy requirement. With motive modifying calibrating a modified conjugate (CHT) model cooling medium was proposed analyze temperature distribution cylinder head. results indicated...

While traditional one-dimensional and three-dimensional numerical simulation techniques require a lot of tests time, emerging Machine Learning (ML) methods can use fewer data to obtain more information assist in engine development. Combustion phasing is an important parameter the spark-ignition (SI) engine, which determines emission power performance engine. In calibration process, it necessary determine maximum brake torque timing (MBT) for different operating conditions best dynamics...

Based on the converse flexoelectric effect, actuator is designed and used to control dynamic displacement of cantilever beams. First, shell-type stress expression based double-curvature shell induced by effect developed, which can be simplified a flexoelectric-laminated beam applying two Lamé parameters radius curvature. Then, with conductive atomic force microscope probe layer. An inhomogeneous electric field generated when external voltage applied layer, leads in longitudinal direction...

In order to study the variation of vortices and heat transfer enhancement characteristics piezoelectric vibrating cantilever in liquid-cooled channels, effects fluid density viscosity, mainstream velocity, excitation voltage on were analyzed. The theoretical numerical simulation was carried out by using fluid-solid coupling method. On basis hydrodynamic function considering additional effect liquid viscosity vibrator, vortex structure vibrator analyzed panel method free-wake model. It is...

Abstract The internal combustion engines will continue to be the major power source for transportation. Spark ignition (SI) are still widely used mobility due their wide range of operating conditions. engine key variables primarily controlled by an already calibrated control unit (ECU). However, a less precise sensor may lead larger variations in performance and emissions. goal this study was investigate importance air-fuel ratio sensitivity during various operations. A one-dimensional (1D)...

GDI (Gasoline direct injection) technology is used in downsized engines for its economy and low emissions. However, if the injection strategy not set properly, will produce more emissions than conventional gasoline engines. In this paper, effect of timing on engine under optimal phasing conditions was analyzed by using a three-dimensional (3D) computational fluid dynamics (CFD) numerical model. The results showed that at medium speed load advancing from −300 to −290 CAD ATDC resulted...

Jet impingement cooling was investigated on a flat heating surface placed in flow channel, including single jet cooling, in-line double and combined crossflow cooling; cross-flow baseline for comparison. In addition, the explored with various distances. Local Nusselt number distribution experimentally achieved by liquid crystal method, measurements were carried out under pressures ranging from 1 bar to 4 bar. It found that heat transfer depends distance because one may produce effect other...

Abstract While numerical models are often used in industry to evaluate the transport phenomena solidification processes, uncertainty results propagated from uncertain input parameters is rarely considered. In this work, order investigate effects of on outputs high pressure die casting (HPDC) simulations, Center for Prediction Reliability, Integrity, and Survivability Microsystems (PRISM) quantification (PUQ) framework was applied. Three propagation trials impact metal material properties,...