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It is known that a dysoxic water mass threatens oyster farming in Dangdong bay. A density current generator is planned to be installed to solve this problem. In this study, we reconstructed the tide level, physical field and dysoxic water mass in Dangdong bay by using numerical simulation and comparing with field measurements and investigated the effect of density current generator by installing it...
This half-day workshop will demonstrate the use of a lottery-based simulation to teach students how to run an agile project by practicing the routine of daily meetings, coordination by mutual adjustment and tracking and reporting of progress. The objective of the simulation is twofold: to teach students the process' mechanics and provide them with insights about the implications on performance and...
During the operation of the coal-fired boiler, dust and slag will accumulated in the inner heat exchange surface. Removing the dust and slag is able to improve production efficiency, reduce pollution emissions and decrease production accidents. It is widely used in many plants due to its advantages like large dust removing area, low energy consumption and low investment. In this paper, a new structure...
As one of automotive engine's important working states, idle-speed has much relation to the engine's fuel consumption and exhaust-gas pollution level. Effective idle speed control (ISC) can improve fuel economy and reduce exhaust emissions, the principal operation of ISC is to uphold the actual engine speed very close to the set point value when any disturbance is added. Automotive engines are typical...
This paper presents ongoing work on the formalism of Cyber-Physical Systems (CPS) simulations. These systems are distributed real-time systems, and their simulations might be distributed or not. In this paper, we propose a model to describe the modular components forming a simulation of a CPS. The main goal is to introduce a model of generic simulation distributed architecture, on which we are able...
With the accelerated urbanization process in China, more and more attention has been paid to residential environment quality. How to improve atmospheric quality, accelerate pollutant emission and reduce resource consumption by rationalizing layout is one of the most important issues in developing a healthy community. Based on the method of fluent flow field simulation, this paper chooses and analyzes...
Thermal management is an important aspect in designing any telecommunication base stations. Cooling is traditionally counted for 25–50% of the total energy consumption for a typical base station. Accordingly, any effort to reduce the cooling load is a considerable merit for base stations' operators. Using outside fresh air directly as coolant, in a stand-alone unit or a combination with an air conditioning...
One of the most noticeable effects on the loss of performance and capacity of thermal systems is caused by the effect of altitude, which causes the density of a compressible fluid and the atmospheric pressure to be considerably reduced, leading to a reduction of power to electrical and thermal systems. In view of this, lithium-ion battery packs that have forced cooling through a compressible fluid...
This paper introduces the application of model based systems engineering (MBSE) method in designing cabin pressurization control system (PCS) for civil aircraft. Rhapsody and Simulink are used as the design and simulation tools. Use cases, functions flow, and state-machines of the system are built by corresponding models in three MBSE design phases, i.e. requirements analysis, function analysis and...
Recently, in the field of building energy efficiency, many works focused on model based energy management services but developing models consistent with a measured reality is still an issue. Fine physical models with many parameters cannot be adjusted while non-physical models cannot extrapolate to situations never met in the training data. In this paper, pure data models will be implemented with...
Modeling and Simulation (M&S) has become an essential tool in the development, testing and verification of operational software in a complex multi-domain, multi-threaded heterogeneous system of systems environment. The complex systems of today encompass mix of hardware sub-systems (with varying degree of capabilities), software environments (comprising a plethora of development environments, operating...
Evolution of modern communications and radar systems have steadily increased the demand on modelling the propagation effects with real world scenarios for various signal types. The main purpose of this research is to create a flexible, generic and realistic Radio Frequency (RF) environment simulator including both radar and communication signals. Software defined radio (SDR) platform has been utilized...
Insulated gate bipolar transistor (IGBT) modules are essential in power electronic application. Due to the improvement in chips and packaging, the maximum operation junction temperature Tvj,op of the latest IGBT module has been increased up to 175°C, comparing to 150°C of the previous generation. With the enhancement of power density, its application at high temperature gives rise to more concerns...
Deep-level mines make use of energy intensive compressed air systems to supply energy for underground mining equipment. These systems are complex due to large underground networks and the size and age of existing infrastructure. Typical deep-level mine compressed air systems consume approximately 20% of the mine's total electricity demand. An insufficient supply of compressed air can result in costly...
Electromagnetic catapult launch tends to be equipped on future carrier deck gradually. This paper aims to establish the mathematical representation of the system of electromagnetic aircraft launch considering aspects of carrier, aircraft and electromagnetic catapult. The proposed catapult system is evaluated by conducted simulation considering disturbance of deck wind and ground effect during stroke...
Aviation maintenance is a critical role of aircraft life cycle operation supports, application of advanced Prognostics and Health Management (PHM) technology to aircraft health monitoring and maintenance being in the research stage, facing lack of engineering practices and data problems. In this paper, the concept of maintenance mode based on PHM is put forward. On the basis of traditional maintenance...
In order to evaluate combat effectiveness of missile weapon system, especially to provide guidance for structural plan design and fuse-warhead coordination design, this paper hereby studies issues about terminal efficiency of three-dimensional fragment type air-to-air missile. Terminal efficiency computation framework of projectile is established, and detailed modeling is conducted to single-shot...
In aircraft type certification, simulation system is used for airworthiness demonstration in lieu of real flight test in certain scenarios, and credit needs to be taken for the simulation system to validate it is capable of representing the characteristics of the airplane under certification. The general requirement and approaches for simulation credit taken is discussed. Typical simulation tasks...
PHM (Prognostics and Health Management) is an engineering technology focusing on failure prognostics and so it has critical effects on the performance of the task system. In this paper, the qualitative analysis method of FMEA (Failure Mode and Effects Analysis) is proposed to analyze the prognostics' performance of PHM system and five corresponding evaluation parameters are derived. Based on some...
This paper will discuss recent improvements made to the Monte Carlo Scene (MCScene) code to enable limb-viewing scenarios and situations where the sun is below the horizon. MCScene is a high-fidelity model for full optical spectrum (UV through LWIR) hyperspectral image (HSI) simulation. MCScene generates HSI scenes for algorithm validation, utilizing a Direct Simulation Monte Carlo (DSMC) approach...
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