Road network is the core component of urban transportation, and it widely useful in various traffic-related systems applications. Due to its important role, essential develop general, effective, robust road representation models. Although several efforts have been made this direction, they cannot fully capture complex characteristics networks.

Abstract Fuel cavitation can cause damage to the structure of an injector control valve, which further affect service life injector. Therefore, it is great importance carry out research on mechanism in valves. In this study, dynamic evolution and fuel flow characteristics during opening a ball valve high‐pressure common rail were studied. First, transient CFD simulation was performed using mesh technology analyze formation cavitation. The influenced by velocity, affected sealing cone angle...

Multi-objective evolutionary algorithms (MOEA) have attracted much attention because of their good global exploration ability; however, local search ability near the optimal value is weak, and for large-scale decision-variable optimization problems number populations iterations required by MOEA are very large, so efficiency low. Gradient can overcome these difficulties well, but gradient methods difficult to apply multi-objective (MOPs). To this end, paper introduces a stochastic weighting...

Abstract Multi‐objective optimization of the main bearing assembly structure entails a high computational cost; moreover, experimental measurement main‐bearing‐hole out‐of‐roundness has problem poor accuracy and inadequate repeatability. To address these issues, an improved NSGA‐II algorithm based on fixed‐sized candidate set adaptive random testing (FSCS‐ART) strategy is proposed, more accurate method for measuring compensation developed. Accordingly, mathematical model parametric are...

Common rail injector response characteristics depend on the control chamber pressure change rate, outlet throttle diameter by manufacturing errors, or wear-induced deviations that affect rate of in chamber, so accuracy directly affects valve consistency. This paper presents a computational fluid dynamics (CFD) simulation effect deviation average mass flow during opening spherical order to reduce this difference and ensure uniform injection characteristics. The results illustrate with...

Aiming at the difficulty of control and evaluation main bearing deformation in coordination design assembly structure for a high-speed diesel engine, taking MRD (the means maximum radial bush) bush as an index to evaluate out-of-round was proposed this paper. The numerical calculation method given correctness experimentally verified. And influence rules different parameters on were analyzed. On basis, multi-objective optimization research carried out, results analyzed based reliability...

Ship design is related to several disciplines such as hydrostatic, resistance, propulsion and economic. The traditional ship process only involves independent optimization with some regression formulas within each discipline there no guarantee achieve the optimum design. At same time, it crucial improve efficiency of modern Nowadays, methods computational fluid dynamics (CFD) has been brought into optimization. However, are still problems calculation precision time consumption especially...

The scaling down of the technology node makes integrated circuits more susceptible to soft errors, normally caused by radiation strike. In this paper, we propose a novel Soft Error Immunity (SEI) SRAM cell using standard 65nm CMOS process, which has good tolerance especially at read state. SPICE simulation results show that proposed is robust variation voltage and temperature. Extensive 3-D computer-aided design (TCAD) analyses can recover upset-state.

The optimization of virtual supply network plays an important role in MTCMOS low power design. Existing works are mainly on gate-level without any physical design level, which can lead to large amount networks. This paper presents (1) a driven flow; (2) novel placement simultaneously place standard cells and sleep transistors (3) transistor relocation technique further reduce the Experiment results promising for both achieving up 28.15% savings networks well controlling increase signal nets

The rapid development of Integrated Energy Systems (IES) is great significance in solving the increasingly serious environmental problems by promoting China's energy evolution. Under huge policy support, IES technology has taken a great-leap-forward development. Meanwhile, large number projects will be carried out extensively. Therefore, operational risk evaluation for urgency. In first place, we summarize basic structure and build index system based on characteristics systems Secondly,...

As the technology advances into deep sub-micron era, crosstalk reduction is of paramount importance for signal integrity. Simultaneous shield insertion and net ordering (SINO) has been shown to be effective reduce both capacitive inductive coupling. Although could efficiently, a large scale unnecessary shields will bring shielding area problem which also critical an efficient SINO algorithm. We propose three novel algorithms using fewer solve problem: namely, coloring (NC), middle (EMSI)...

Significant changes have been occurred to the energy supply and consumption mode of China. Nowadays, establishing integrated system has become key method build modern with characteristics clean, low-carbon, safe high efficiency. The research subject this paper is achieve optimization comparison Integrated Energy Systems projects. basic structure was presented in first place. Second, comprehensive benefit evaluation indexes designed according A model based on AHP-fuzzy theory built put into...

A method for characterizing coordinated deformation of diesel engine main bearing is proposed to address the problem that traditional evaluation indexes are difficult accurately characterize deformations shell and crankshaft. The margin between clearance assembly employed judge whether motion interference occurs crankshaft journal after deformation. numerical calculation proposed. Experiments designed conducted verify feasibility accuracy index. influencing mechanisms sensitive parameters on...

The current multi-objective evolutionary algorithm (MOEA) has attracted much attention because of its good global exploration ability, but local search ability near the optimal value is relatively weak, and for optimization prob lems with large-scale decision variables, number populations iterations required by MOEA are very large, so efficiency low. Gradient-based algorithms can overcome these problems well, they difficult to be applied (MOPs). Therefore, this paper introduced random weight...

Abstract Response coordination design becomes an inevitable trend based on the multidisciplinary optimization (MOD) in development of for complex mechanical structures. Aiming at problem unclear mechanism response main loaded structures, a technology characterized by evaluation system is proposed analytic hierarchy process. In addition, nondominated sorting elephant herding (NSEHO) algorithm introducing Pareto theory into and combining fixed‐sized candidate set adaptive random testing to...