Molybdenum disulfide quantum dots (MoS2 QDs) are a promising lubricant additive for enhanced engine efficiency. In this study, MoS2 QDs were used as lubricating oil additives ball-on-disc contact and had adequate dispersity in paroline oil, due to their super small particle size (~3 nm). Tribological results indicate that the friction coefficient of with 0.3 wt.% reached 0.061, much lower than pure (0.169), which is formation stable tribo-film formed by MoS2, MoO3, FeS, FeSO4 composite...

To accurately assess the impact of misalignment errors with interval properties on dynamics face gear drive, a method for uncertainty analysis mounting based is proposed. Considering stiffness excitation and error excitation, model drive developed, while tooth contact (TCA) loaded (LTCA) are established. Then range dynamic response determined using Chebyshev inclusion function method. The research findings demonstrate that can alter bearing pair which resulting in shifts resonance peaks....

Representative driving cycles are very important for testing energy consumption and pollutant emission, optimizing control strategy, designing power resource components of vehicles. Multi-parameter representative needed to improve vehicles' adaptability the environment. Thus, high-dimensional need be efficiently generated. Additionally, generation method should flexible enough facilitate use by automobile engineers. This study introduces a hyper-heuristic framework into Markov chain...

Road grade greatly affects energy consumption and pollutant emission of heavy-duty vehicles. It is therefore necessary to develop representative three-parameter driving cycles while taking road into account. However, the low running efficiency existing methods for developing a serious problem. To improve efficiency, inspired by idea that intelligent algorithms with self-adaptivity can accelerate convergence, an adaptive Markov chain evolution (AMCE) method proposed in this study. Based on...

Although axial free floating of the driving pinion can automatically balance load left and right helical gear pairs, it causes its three-dimensional vibration. A new loaded tooth contact analysis (3-DLTCA) model a double considering support stiffness is proposed in this paper. Firstly, according to differential geometry mechanical analysis, 3-DLTCA established. The based on deformation coordination condition, force non-embedding condition constraint. Secondly, reduce transmission error...

The driving gear affects engine transient cycles. Current methods of designing cycles need to establish the shift model transmission system, and differences from actual law result in quantitatively low consistency test Then representativeness accuracy designed steady-state will be worse. By expanding Markov chain evolution (MCE) framework, this study, four-parameter with for heavy-duty vehicles are designed, which can represent cycle distribution. model-based multi-parameter state transition...

A new dynamic model for a two‐input two‐path split torque transmission system which considers meshing error, time‐varying stiffness, and meshing‐in impact is proposed. Time‐varying stiffness of each gear pair are accurately calculated based on tooth contact analysis loaded analysis. Equivalent displacements eccentricity error installation along the line second‐ third‐stages gears derived. The modified surface third‐stage double‐helical obtained by optimizing amplitude static via nondominated...

Face gear is the major parts of helicopter transmissions for split torque equipment. The process generation face critical factors to prevent drive be applied. A novice method proposed generated by use a general shaper. design and geometry were investigated that include tooth generation, limiting inner outer radii, contact analysis drive. with 89 teeth was successfully In order demonstrate bearing drive, an experimental investigation also developed in bevel meshing machine. results show...

The large cylinder is difficult processed material, which be based on the analysis of processing feature cylinder, method proposed basics actual case resemblance, optimal solution educed by calculating vocal and whole similarity with technical property. preferred system can provided for process.

Chassis dynamometer testing based on representative driving cycles is commonly performed in the evaluation of fuel economy heavy-duty vehicles. However, requirement for a zero or fixed grade when using traditional chassis results inaccurate vehicle to be driven hilly roads. Against this background and considering that engine operation conditions should remain consistent, study proposes an equal-power-based Markov chain evolution method whereby multi-parameter with time-varying road are...

Abstract The alignment deviation of the V-vertex two symmetrically arranged gears with different rotation directions is a unique geometric parameter double helical gears, which has an important effect on vibration, noise, and gear service life. Aiming to more accurately represent manufacturing accuracy their transmission performance, this paper proposes meaning v-vertex basis contact line tooth surface based apex characteristics gears. First, mathematical model flank established meshing...