Dynamic time-varying operational conditions pose great challenge to the estimation of system remaining useful life (RUL) for deteriorating systems. This paper presents a method based on probabilistic and stochastic approaches estimate RUL periodically monitored degradation processes with dynamic condition-specific failure zones. The assumes that rate is influenced by specific condition moreover, transition between different plays most important role in affecting process. These are assumed...

Smoke poses a great risk to people in tunnel fire if not controlled effectively, so how extract smoke out of is an important issue protection. In this study, numerical simulation has been carried study the influence damper configuration on point extraction ventilation system urban using FDS 5.5. Six scenarios have simulated with different configurations, and results flow rate, visibility temperature distribution analyzed evaluate cases. It can be concluded that area little control when it...

Fire poses a great risk to people in tunnel if it is not controlled effectively, so how detect and locate fire an important issue of protection. In this study, numerical simulation has been carried out study the impact longitudinal ventilation on detection system urban using FDS 5.5. It can be concluded that influence alarming time position when breaks tunnel. order ensure covered by fire-fighting system, suggested alarm section sends signals, corresponding sprinkler its upstream one should...

The purpose of this current research is to schedule generalized periodic replacement policies for a single unit system executing random working jobs. subject two types failures when it has failed, including minor failure (Type I failure), which can be thoroughly removed by the minimal repair and catastrophic II should rectified corrective replacement. To specific, four distinct models first model (Model A1), modified A2), last B1), B2) are investigated. long run average cost rate (ACR) over...

To study the influence of inclination on flame spread solid surfaces and improve accuracy theoretical model to predict rate through detailed heat flux distribution in surface, a set numerical simulations fire corrugated cardboard surface at different angles (0° ≤ θ 30°) is carried out. The are performed using FireFOAM, large eddy simulation solver with "wall-resolved" approach. Great attention paid explanation for acceleration angle transfer. Less models except treatment turbulence. results...

An operation control approach for heavy haul trains to reduce the train's operating cost with operational safety and service quality considered is proposed. The main purpose of this study alleviate cyclic vibration couplers connecting neighboring cars in train improve overall performance. This done by presenting a penalty factor coupler damping dynamically varying weight on velocity tracking term objective function formulated problem. Reduction maintenance/replacement energy consumption are...

There are a large number of papers in the literature dealing with free vibration analysis single/multi-span uniform beam multiple spring-mass systems, but that coupled multi-span beams any systems is rare. In this paper, an approach based on finite element presented to analyze attachments. Firstly, equation motion system attachments established by conventional method. Secondly, natural frequencies and associated mode shapes obtained from generalized eigenvalue problem. It found results...

This paper presents a prognostics approach based on operating condition for estimating the Remaining Useful Life (RUL). Operating is used to describe state or environment of system. suit dataset that contains sensor measurements and operational settings. Predicting RUL two stages: modeling stage using training predicting result testing dataset. can increase available information in simulate actual work situation test unit stage. The performance this was tested by from 2008 PHM Data Challenge...

To develop a kind of ideal sealing material, uniform experiments were conducted in simulation test device after the determination material composition and approximate ratio range. The experimental data was fitted by stepwise regression analysis optimal mixture obtained. reliability is perfect when foaming agent FP, foam stabilizer WP, solid filler RX GX 1.5:2:3:3. Field application tests show that above has advantages less time waste, higher better adaptability. It wide prospect for...

Abstract A joint planning method for distribution network and substation considering the influence of electric heating load is proposed based on LCC in this paper. multi-state model level obtained by state sampling combination ordinary according to Monte Carlo (MCS). Taking line investment cost, operation maintenance adjustable capacity transformer loss cost user outage as objective functions, a established. The multi-objective optimization problem transformed into single-objective...

FireFOAM solver is used to simulate downward flame spread on the surface of a single-wall corrugated board with different inclination angles (0° ∼ −30°), and study countercurrent fire behavior heat transfer control mechanism solid surfaces under angles. The simulation results show that when angle less than −20° rate mass loss will first decrease then stabilize. Combining flow field temperature field, it can be found cold air entrained by have cooling effect occurs distal end downstream...

Large scale renewable energy units, DC transmission and other power equipment are connected to the electrical system, which leads problems such as high transient voltage control instability, then affects consumption level of energy. The is closely related support strength system. quantitative index reflecting in collection area MRSCR. Firstly, this paper analyzes impact multiple station short-circuit ratio on safe operation compares common methods application effects improvement. Secondly,...

to the management techniques for software-based orgnizations on their period of processing a innovative product reserching. All works and efforts we do can be divided into two sorts: regular occasional works, later one, named it “the projects”.As teamleader orgnizaion whose job duty is core team get reach final goal, concept project managing planning abbility essencial fact. We divide whole leadership quality five actors according different manaing situationas, which need techniques, propose...

In order to ensure the quality of construction, government played a very important role in process project supervision management. Based on analysis Chinese present construction engineering supervisions, managements and controls, this paper gave some optimized measures. By studying overall objectives, implementation strategies, function modules, plans Quality Supervision Management Information System Changchun, conclusion was drawn: management information system could help department improve...

In the ground of preliminary study Taihangshan Mountain Tunnel, it was observed that under water-rich conditions, long rolling heavy-haul trains would deteriorate surrounding rock, thereby causing damage to bottom structure. Combined with data from long-term field monitoring and discrete element analysis, after clarifying law bedrock deterioration, Fuyingzi Tunnel Zhangtang Railway in China is taken as research object fatigue damage. ANSYS Workbench simulation software used compare further...

Automatic robots have been extensively employed to inspect steam generator (SG) tubes. Positioning and fixation of underneath tube-sheet plates are enabled by tube grippers. In this paper, configuration design performance analysis a new gripper were carried out. To calculate the gripper's load capacity, numerical was used establish finite element (FE) model gripper. Furthermore, orthogonal experiment statistical methods combined with FE adopted explore influence on contact between tube's...

Automatic robots have been extensively employed to inspect steam generator (SG) tubes. Positioning and fixation of underneath tube-sheet plates are enabled by tube grippers. In this paper, configuration design performance analysis a new gripper were carried out. To calculate the gripper's load capacity, numerical was used establish finite element (FE) model gripper. Furthermore, orthogonal experiment statistical methods combined with FE adopted explore influence on contact between tube's...