The failure law is not clear in operation of complex electronic system. The failure data can not be effectively used. And it is difficult to assess the current state of the system. This paper proposed a fitting method of failure data based on triple Weibull distribution model for complex repairable long-life-cycle...

The headbox is heart of the paper machine in paper industry. In the paper, the flow dynamics of the dilution water that adjusts the consistency of the fluid in a hydrodynamic headbox was studied by performing computational fluid dynamics (CFD) simulations. A standard k-ε turbulence model was used in...

Considering the inefficiency of classical DOE (Design Of Experiment) based polynomials RSM (Response Surface Method), this paper proposes a simplified experimental modeling method to approximate a quadratic polynomials RSM model (called Archetype in this paper). This simplified model contains the same...

In this paper, we established a model of the birth and death process with blocking growth. Based on the theory of stochastic process and the classical model of birth and death process, we calculated the expectation and variance of population. We also showed the influence of blocked items on the population...

The more obvious global warming in past years has resulted in climate changes. Located in circum-Pacific earthquake zone, lots of earthquakes often result in landslides. Moreover, the island climate, greenhouse effect, and climate abnormality cause frequent heavy rainfall and rainstorm for disasters...

The Goldbach conjecture declares that any even number 2m=2n+2>4 can be expressed as the sum of two prime numbers. The mathematical modeling of the conjecture is: any even number 2m=2n+2 greater than 4 can be expressed as 2n+2=a+b, 2≤a≤n+1, n+1≤b≤2n. With the modeling, let c be a composite number in 2~2n,...

Random aggregate model of recycled concrete is set up based on the understanding of recycled concrete mesostructure. First of all, the number of particles of all kinds of aggregate size was obtained on the 2 d and 3 d level by fuller grading theory and navarre gradation formula, then, Using carlo method...

The ship radiated noise is used as information sources of passive detection and classification, at the same time, the realistic simulation of ship radiated noise signals is an effective way to deceive the passive acoustic detection equipment. In this paper, we analyze a large amount of near field radiation...

Finite element method (FEM) is an effective method to study high-speed cutting mechanism. To set up the FEM models of high-speed cutting auto panel dies, large deformation theory and virtual work principle were applied to study high-speed machining process. The finite element governing equation adapted...

Combined with the engineering requirements for the optimal allocation of the current ammunition equipment spare parts, a spare part optimization model based on genetic algorithm was established. With the combination of good readiness and cost of ammunition equipment, the use of genetic algorithm had...

The sudden mass passenger after social events can make huge impact on the normal operation of rail transit station. This paper mainly studies on the influence of mass passenger flow after special events on the passenger organization of the station nearby. Based on the investigation of station facilities...

Papers use adaptive thinking[4] and Boid model and Couzin et al.[6][7][8] mathematical description Boid model method, described the vehicle as the driver based on the current state of environment and adapt to the individual behavior, the driver's driving process is a process of adapted to the environment...

Mechanics technology training course, it can comprehensively use mechanics technology and other related theories and practical knowledge of completed courses. It can carry out systematic design and training for students. It can further consolidate, deepen and expand these knowledge. In practical training,...

A project management method for the simulation work has been introduced, including agile methodology, scrum framework, and cockpit simulation projects. Agile development takes the evolution of user’s needs as the core, and adopts step-by-step to develop software iteratively. In the agile development,...

It establishes the numerical simulation method of Cl- concentration distribution by using differential equation of similarity of two-dimensional heat conduction theory and two-dimensional Cl- diffusion theory. Random aggregate model of Recycled concrete mesostructure is set up in the first place, then,...

Proper incentive policy guidance is the key to the successful implementation of electric energy substitution strategy. At present, there is a lack of evaluation method for the effect of electric energy substitution policy. Quantitative policy simulation analysis method is needed to provide support for...

Under high-temperature conditions, the microwave sintering process is exceedingly sensitive in terms of material properties. Accordingly, the accurate measurement of temperature is infeasible when a microwave oven is utilized as the main apparatus. Therefore, a three-dimensional model built through the...

With the rapid population aging in China, the older adults who needs for long-term care (LTC) increased dramatically in the past decades. To forecasting the use of institutional elder care in China, this study constructed a system dynamic model for LTC use to capture the decision-making process of living...

A human-machine interaction (HMI) simulation design method for the aircraft flight deck has been introduced, including modular user interface design, logical dependency between display unit and control panel, and general aircraft model. Model-View-Controller (MVC) design pattern is a classic software...

Sufficient conditions are obtained for the local asymptotic stability of a water resource competition model with diffusion of poisonous weeds and Allee effect. It is shown that diffusion and Allee effect can increase the possibility of species renewal.

Simulation is the imitation of the operation of a real-world process or system which is a common method for scientific analysis. A model is required here to represent the key characteristics, behaviors and functions of the selected physical or abstract system or process. The global 3-D atmospheric model...

The ultra-fine dry powder injection process in non-pressure-accumulated and handheld fire extinguishers involves gas-phase and solid-phase two-phase movement. The fire-extinguishing effect is closely related to its jet form. In order to study the jet form accurately, this paper selects the discrete particle...

Accompanied by the rapid development of offshore oil exploitation and utilization, what’s more, the oil spilled in deep sea will cause much larger pollution of water body than that occurred in the sea surface. The diffusion range can provide timely information for the handling of the oil spill accidents....

Constant elasticity of variance model for option pricing in a composite-diffusive regime is established. We obtain the Black-Scholes differential equation and the corresponding Black-Scholes formula for the prices of European call option. Furthermore, we discuss an asymptotic expansion of the European...

On March 26, 2018, Chinese crude oil futures start online trading in Shanghai futures exchange, a subsidiary of Shanghai international energy trading center. Chinese crude oil futures are expected to balance the current benchmark prices of WTI and brent .This study aims at analyzing the Chinese high...

At present, operating most wastewater treatment plants (WWTP) in China typically relies on experiences of managers, that is, fuzzy control. However, sewage water quality fluctuates and is frequently unstable given the intensified modernization. Fuzzy control cannot satisfy the requirements of microbial...

Design standard for energy efficiency of residential buildings (75% energy-saving) " DB13 (J) 63 and “Design standard for energy efficiency of passive low-energy residential buildings” DB13 (J)/T177 of Hebei province were issued in 2015. Both provides theoretical support for energy-saving design and...

The study is concentrated on the isotropic elastic responses of a homogeneous isothermal pervious surface or adiabatic impervious surface due to injection of compressible hot fluid. Based on the theory of thermal elasticity of porous media, the analytical models are developed for the ground deformation...