Bridges are inevitably affected by daily, seasonal and annual air temperature solar radiation. The thermal effects on bridges, especially for long-span cable-stayed bridges with composite girders, significant complicated. evaluation of distribution has been a primary concern to bridge engineers researchers. This article presents more than one-year database small cantilever length-to-web depth ratio in the girder. Uniform temperature, linear difference, curvature, self-equilibrated stress...

To evaluate the fault risk of a small railway turnout ballast clearing machine, this paper employs Analytic Hierarchy Process (AHP) to assess reliability based on subjective experience. Additionally, fuzzy comprehensive evaluation method is utilized quantify risk. This combined approach facilitates construction an objective and rational assessment system for ballast-clearing machine. The four main factors, which include rake claw fault, bearing chain sprocket are analysed using Process,...

Complex wind and temperature characteristics in the Yellow River basin (YRB) challenge safety durability of long-span concrete-filled steel tube (CFST) bridges greatly. To address this issue, it is important to accurately assess joint actions temperature. In paper, eight typical YRB cities are analyzed. The distributions speed air developed with Archimedean Copula, Kendall return period used for occurrence probability estimations. Eight wind–temperature combinations considered. Responses...

Automatic glacier extraction from remote sensing images is the most important approach for large scale monitoring. Commonly used band calculation indices to enhance information are not effective in identifying shadowed glaciers and debris-covered glaciers. In this study, we Kolmogorov–Smirnov test as theoretical basis determined suitable distinguish different land cover classes by comparing inter-sample separability reasonable threshold range ratios of indices. We then constructed a...

The backless cable-stayed bridge has the advantages of beautiful shape and reasonable force, but due to low overall stiffness pylon during cantilever construction, it is susceptible effect solar temperature. To reveal temperature deformation laws achieve accurate alignment prediction installation process steel–concrete composite pylons in complex environments, a refined numerical simulation model for 3D field was established based on proposed automatic sunshine-shadow recognition method....

Recovery of waste heat from boiler flue gas is an effective way to improve energy utilization efficiency. Taking a heating station project as example, the existing system this was analyzed for its underutilized and low rate. Rankine cycle recovery method, steam organic (ORC) cogeneration method proposed. The model simulation constructed verified. First, thermodynamic in MATLAB five suitable work gases were selected analyze effects evaporation temperature condensation on network thermal...

Pouring is an important process in the production of solid propellant rocket engines, and usually, cost a engine extremely high. Therefore, pouring with high reliability very important. The three engines simultaneously can greatly improve its efficiency. However, it makes system more complex redundant. For multi-state system, difficult to make accurate evaluation reliability. Aiming at redundancy multiple acousto-optic combined control three-engine slurry alarm dissimilar redundant units,...

Nowadays, the energy-saving optimization problem has gradually become a hot spot in subject of high-speed train control. Traditional static trajectory planning is designed offline according to preplanned timetable, but ignored are uncertainties parameters because line conditions and other factors process operation. Thus, previous operation strategy may not suit remaining section. The cooperative control for multiple trains was investigated with aim conserving energy between successive...

This paper investigates the five-axis continuous machining strategy on cost-effective CNC milling systems, which is limited by simultaneous control of any four axes at a given time. The proposed consists (1) generation tool path for conventional machines using CAD/CAM software, and (2) conversion generated to four-axis trajectory based novel interpolation algorithm. algorithm built relationship between position data displacement machine axis. point determined offset distance point, error...

The process of disc-mill cutter machining blisk-tunnel is a typical multi-input and multi-output system, therefore multi-objective optimization applied to improve the process. In this paper, an integrated approach that Grey Relational Analysis(GRA)couples with Radial Basis Function (RBF) neural network Firefly algorithm (FA) used solve problem. aim satisfy minimum cutting force maximum material removal rate simultaneously by optimizing speed, feed per tooth height. results for verifying...

To accurately assess the temperature action and effect of steel-concrete composite girder bridges in plateau cold areas, this paper investigated nearly 50 years historical meteorological data from 26 observation stations Tibet region China. Based on most unfavorable extreme at each station, a finite element model was used to analyze field girder. The values were obtained. regional differences actions different analyzed, isotherm maps uniform thermal gradients further obtained based spatial...

In order to meet the requirements of output torque, efficiency and compact shape micro-spindles for small parts machining, a two-stage axial micro air turbine spindle with an inlet outlet is proposed. Based on k-ω turbulence model SST, flow field operation characteristics were studied using computational fluid dynamics (CFD) combined experimental study. We obtained under different working conditions loss torque characteristics. When pressure was 300 KPa, speed 100,000 rpm, 9% higher than...

The Chemical and Volume Control System (CVCS) in nuclear pressurized power plant are charge of coolant pump seal injection, primary loop volume control safety or security. characteristics the system normal operation incident situation will leave a remarkable impact on safe numerical verification CVCS behavior shows that model established this paper can predict thermal hydraulic accurately. SIS investigated with Computational Software, Flowmaster V7.5, models validated design data. If SGTR...

Abstract In order to increase the service life of mixer blades, reliability blades is optimized. this paper, blade calculated by combining stress-strength interference model and discrete element method. Furthermore, orthogonal experimental design regression analysis are combined obtain a significantly higher equation with fewer experiments. According established relationship between parameters as goal, particle swarm optimization used optimize mixer. Finally, twin-shaft that mixes foamed...