Simulation Modeling - Science topic

Inverse analysis plays a crucial role in various engineering disciplines, enabling the calibration of simulation models based on observational data and thereby enhancing their predictions. In the context of risk-informed decision making for engineering systems, it is essential to explicitly account for uncertainties in both the calibrated model and...

Obesity and its complications are associated with high morbidity/mortality and a significant healthcare cost burden in Spain. It is therefore essential to know the potential clinical and economic benefits of reducing obesity. The objective of this study is to predict the decrease in rates of onset of potential complications associated with obesity...

This study tackles the challenge of accurately predicting the earliest possible completion time for civil engineering projects, a crucial aspect of construction project management. Traditional scheduling methods often struggle to address the uncertainties and risks these projects face, such as unpredictable weather, fluctuating resource availabilit...

Nanoparticles (NPs) in contact with biological fluid adsorb biomolecules into a corona. This corona comprises proteins that strongly bind to the NP (hard corona) and loosely bound proteins (soft corona) that dynamically exchange with the surrounding solution. While the kinetics of hard corona formation is relatively well understood, thanks to exper...

The study aimed to simulate, model, and analyze multiphase flow in a shell and tube heat exchanger to evaluate its performance in cooling methanol using cooling water. The simulation utilized Aspen Hysys 8.8, while statistical analysis and modeling were conducted using Minitab 17.0, and multiphase flow analysis using COMSOL 5.3. The results showed...

Meteorological characteristics and freeze-thaw processes are crucial indicators guiding regional economic development and practical production. The Da Xing’anling Mountains, serving as a transitional zone between continuous permafrost and seasonal frozen ground in northeastern China’s high latitudes, understanding the meteorological parameters and...

A thermal‐energy‐storage (TES) system is investigated in this work. The charging process uses hot air passed through a fixed bed, transferring thermal energy to solid particles, while discharging occurs with cold air flowing in the opposite direction. A novel automated dynamic simulation model of the TES is developed and validated using data from t...

Objective. A new nuclear Overhauser enhancement (NOE)-mediated saturation transfer MRI signal at −1.6 ppm, potentially from choline phospholipids and termed NOE(−1.6), has been reported in biological tissues at high magnetic fields. This signal shows promise for detecting brain tumors and strokes. However, its proximity to the water peak and low si...

The formation of a coal mine roadway cross-section is a primary task of the boom-type roadheader. This paper proposes an intelligent robust control scheme for the cutting head trajectory of a coal mine tunneling robot, which is susceptible to unknown external disturbances, system nonlinearity, and parameter uncertainties. First, the working conditi...

The article focuses on researching and improving dynamic performance of an electric power-assisted bicycle (EPAB) based on simulation models under human control. The model takes into account structural parameters such as wheel radius, bike mass, and crank length by building a simulation model of EPAB. The article then discusses the development of a...

Background Radiotherapy practice for cancer treatment is resource-intensive and demands optimised processes for patient throughput while guaranteeing the quality and safety of the therapy. With the COVID-19 pandemic, ad-hoc changes in the operation of radiotherapy centres became necessary to protect patients and staff. This simulation study aimed t...

Transmission line towers play an important role in power transmission, and the assessment of transmission line tower grounding by pulsed eddy current detection technology is conducive to the safe and reliable operation of power transmission. Aiming at the problem that the primary and secondary magnetic fields of the traditional pulsed eddy current...

The mechanism of slagging in municipal solid waste incinerators is complex, and the slagging process is simultaneously affected by the composition, temperature, and flue gas flow. In this study, slag samples on a water-cooled wall were first analysed, and the key components and fusion temperatures were measured. Second, a gas-phase combustion model...

The aim of this paper is to study the performance of a matched filter for baseband binary transmission when subjected to Gaussian noise. A BER performance simulation model is created which consists of a BPSK encoder, a transmission SQRC filter, a Gaussian noise generator, a receive SQRT filter and a BPSK decoder. A Monte Carlo simulation technique...

This study presents the design, modeling, and validation of a mixing screw for energy-efficient single-screw extrusion. The screw features a short length-to-diameter (L/D) ratio of 8:1 and incorporates double flights with variable pitch and counter-rotating mixing slots. These features promote enhanced plastication by breaking up the solid bed and...

Quantum repeaters and satellite-based optical links are complementary technological approaches to overcome the exponential photon loss in optical fibers and thus allow quantum communication on a global scale. We analyze architectures which combine these approaches and use satellites as quantum repeater nodes to distribute entanglement to distant op...

In this article, to investigate the comprehensive influence of the opening size and location of the packing box on precooling performance, a simulation model of precooling with 20 opening parameters is established based on computational fluid dynamics. There are six openings on one side of the box, 12 in total, with 5 opening positions (Cases 1–5)...

This research proposes a reflow thermal recipe (RTR) optimization model based on the after-reflow defect inspection simulation results. RTR, which refers to the temperature setting of each zone in a forced convection reflow oven, is the most important parameter during the soldering reflow process (SRP). The components are attached to the printed ci...

This paper presents two methods for reallizing fluid property functions in Modelica simulation models. Each makes use of a coordinate transformation that aligns one coordinate with the saturation curve. This provides for a precise representation of the fluid property function at the saturation curve, and for connected domains of interest including...

The aim of this paper is to study the performance of a matched filter for baseband binary transmission when subjected to Gaussian noise. A BER performance simulation model is created which consists of a BPSK encoder, a transmission SQRC filter, a Gaussian noise generator, a receive SQRT filter and a BPSK decoder. A Monte Carlo simulation technique...

Context-aware systems are widespread in our daily lives, but modeling languages that address the notion of context are rare. Variable structure systems (VSS) allow for structural and behavioral changes in physical models at runtime (while the simulation is running) based on different situations. It is desirable to explicitly describe under which co...

Resonant converters are widely used in various industrial applications due to features such as wide input voltage range, high efficiency, and high‐power density. Mathematical modelling of these converters is crucial because they simultaneously exhibit AC and DC modes, complicating the design of their controllers. This paper proposes a new method fo...

Allyl chloride is typically used to make intermediates for downstream derivatives such as resins and polymers, and in the production of epichlorohydrin. The present work describes the simulation and conceptual design of an allyl chloride production process via the propylene chlorination route in ChemCAD simulator, to know the mass and energy balanc...

The combination of vision and robotic grinding technology provides robots with “visual perception” capabilities that enable them to accurately locate the area to be ground and perform the grinding tasks efficiently. Based on the rough grinding requirements for wheel hub burrs proposed by a casting company, this paper investigates the application of...

Modern manufacturing environments are yet to fulfil the evergrowing competitive supply and demand due to the limitation of conventional production approaches. A low-carbon approach incorporating the change from process to product-centric manufacturing systems could conserve energy while fulfilling supply and demand requirements in a competitive mar...

This paper develops an improved simulation model for the gas metal arc welding process, incorporating the arc root conduction zone, the transistorized power supply, and its PID-controller parameters. The model is applicable to short-circuiting, free-flight, and active control transfer modes. For the short-circuiting transfer mode, the molten metal...

Optimizing energy efficiency in gas-sweetening processes is crucial for reducing operational costs and improving environmental sustainability. This study introduces a novel approach to optimize the amine regeneration process, a critical component of gas sweetening operations, at the Mellitah gas plant. Using Aspen HYSYS software, a simulation model...

To address the glare issues caused by highway ETC gantry monitoring and imaging illumination devices, this paper first investigates the mechanism of disability glare and derives the formula for the glare threshold increment. Subsequently, using the glare increment threshold as the evaluation metric and incorporating the current regulatory requireme...

With the rapid development of precision manufacturing technology, the improvement of product appearance design and functional performance has become increasingly important. This study aims to optimize the appearance design of precision manufactured products by combining heat flow simulation with human–machine interaction. The study reviewed the pro...

The paper presents the results of experimental verification of the constructed simulation model of the two-axle vehicle - single-axle unbraked trailer assembly. The model describes the effect of the trailer’s centre of mass position on the braking distance. The constructed model and the assumptions adopted for its construction are described at the...

Passenger comfort is one of the critical factors in the railway system. Passenger comfort plays an important role in the success and effectiveness of railway transportation systems in terms of passenger satisfaction, health and well-being, economy, competition capability, and safety. For the railway infrastructure, one of the important components i...

The foundation of Empirical dynamic modeling (EDM) is in representing time-series data as the trajectory of a dynamic system in a multidimensional state space rather than as a collection of traces of individual variables changing through time. Takens's theorem provides a rigorous basis for adopting this state-space view of time-series data even fro...

The multiple working modes, complex working conditions, frequent changes in external heat flux, and high-power consumption of satellites all pose great difficulties to their thermal design. In this paper, the material MB15 magnesium alloy was used, which has not been performed for the main structure of satellites. This material not only reduces the...

The constant current followed by constant voltage (CC-CV) charging method is commonly employed for battery charging, effectively extending battery life and reducing charging time. However, as charging progresses, the battery’s internal resistance increases, complicating the charging circuit. This paper designs a wireless power transfer system utili...

This paper focuses on the utilization of dynamic simulation models in the planning of experiments for control development. The simulation system is a set of models based on the first principles for system level simulation of the complete TCP-100 research facility at Plataforma Solar de Almería (CIEMAT). This new research facility replaced the 32-ye...

Pole tower grounding bodies are part of the normal structure of the power system, providing relief from fault currents and equalizing overvoltage channels. They are important devices; however, in the harsh environment of the soil, they are prone to corrosion or even fracture, which in turn affects the normal utilization of the transmission line, so...

The rapid development of flexible electronics necessitates simplified processes that integrate heterogeneous materials and structures. In this study, laser engraving is combined with electrochemical deposition (ECD) to directly fabricate various micro/nano‐structured components and flexible electronic circuits. A theoretical framework and simulatio...

The amine-based CO2 capture rig at USN in Porsgrunn has been operating since 2007. In this study, the main aim was to develop predictive models in Aspen HYSYS and Aspen Plus for the CO2 test rig. The models accuracy were verified by comparing different test scenarios with results from the models. Aspen HYSYS and Aspen Plus have simulated eleven sce...

The manufacturing industry is transitioning towards digital, intelligent, and sustainable practices. However, small and medium-sized enterprises (SMEs) often lack the resources and expertise to leverage digital tools in their research and development (R&D) activities. This paper demonstrates warehouse optimization using a Genetic algorithm to optim...

This paper describes the design and evaluation of an autoflight controller under maximized crosswind landing scenarios using Nonlinear Dynamic Inversion (NDI) and Incremental Nonlinear Dynamic Inversion (INDI) control methods. The simulation model is representative of a nonlinear, 6 DOF twin-engined civilian transport aircraft in landing configurat...

The groundwater extraction will lead to a drop in water level, causing a change in the distribution of additional stress in the strata. This phenomenon leads to uneven settlement of the railway subgrade. In severe cases, this could threaten the safe operation of trains. Therefore, the degree and main factors influencing groundwater extraction in th...

This research evaluates the technical and economic aspects of solar photovoltaic (PV) power installations on farmland, utilizing a simulation model in MATLAB to forecast annual system output based on nominal power and meteorological data. This study compares various configurations, including single-sided versus double-sided modules and fixed versus...

This paper deals with the problem of investment in new means of production, taking into account as well financial aspects as scheduling issues. Firstly, a presentation of the tackled hybrid flow shop scheduling problem and its translation into production capacities at different stages. Then, hypotheses and modeling choices made for investment decis...

The dynamic injection characteristics of high-pressure common rail fuel injection systems are determined by the speed response performance of the solenoid valve. A simulation model has been established for investigating the influence mechanism and change law of characteristic parameters on speed response characteristics of the solenoid valve. The s...

In 2020, several countries implemented restrictive measures on a wide range of business activities as a crucial step to control the rapid spread of the COVID-19 pandemic. In the urgency of the situation, many nations swiftly implemented extensive and stringent lockdown measures, causing significant disruptions to global supply chains and inflicting...

In the rapidly evolving domain of large-scale retail data systems, envisioning and simulating future consumer transactions has become a crucial area of interest. It offers significant potential to fortify demand forecasting and fine-tune inventory management. This paper presents an innovative application of Generative Adversarial Networks (GANs) to...

Worldwide, wheat is one of the most widely used cereals in the human diet and, in Mexico, it ranks second in production after corn. Nevertheless, its productivity is affected by the low efficiency of chemical fertilizers and the loss of nutrients in the soil, leading to environmental problems. It is necessary to look for alternatives to reduce the...

Plain Language Summary Magnetic reconnection is a fundamental process in plasmas during which magnetic field energy is transferred, often explosively, to plasma particles. Magnetic reconnection develops in current sheets—extended regions of enhanced electric currents that are ubiquitous in plasmas. Current sheets are also the natural seedbed of pla...

With its unique three-dimensional structure, high porosity, and lightweight, warp-knitted spacer fabric (WKSF) is an excellent insulation material. Multilayer fabric is an effective solution for better heat control, meeting the different requirements of a wide range of applications in the field of temperature control. To know the relationship betwe...

Deformed droplets are ubiquitous in various industrial applications, such as inkjet printing, lab-on-a-chip devices, and spray cooling and can fundamentally affect the involved applications both favorably and unfavorably. Here, we employ many-body dissipative particle dynamics to investigate the oscillations of water droplets on a harmonically and...

The operation and modelling of doubly fed induction generators (DFIGs) are quite different in grid-connected and stand-alone operated wind energy conversion systems (WECSs). Researchers usually simulate DFIGs in these operations using the pre-built models provided in commercial software, which are built using complex modeling techniques that most r...

Automating the extraction of mechanical fasteners from end-of-life (EOL) electronic waste is challenging due to unpredictable conditions and unknown fastener locations relative to robotic coordinates. This study develops a system for extracting cross-recessed screws using a Deep Convolutional Neural Network (DCNN) for screw detection, integrated wi...

In this paper, using propagating Lamb waves along the inclined curved surfaces, we present a technique to reduce the impact of rainy days on-camera performance. Our experimental results show that Lamb waves, generated at a location distant from a point of droplet impact, can suppress the formation of satellite droplets during partial rebound. Addit...

A novel, to the best of our knowledge, out-of-plane microelectromechanical system (MOEMS) gyroscope based on Wood’s type anomaly utilizing a subwavelength grating pair has been proposed. Based on this anomalous diffraction phenomenon, tiny changes in the displacement of the nanostructured grating elements lead to a dramatic increase or decrease of...

For offshore wind power low-frequency transmission system fault, the fault current on both sides of the line by the influence of the control strategy of the amplitude is limited, the phase angle of the open swing increases, resulting in the failure of the traditional longitudinal differential protection criterion. In order to solve this problem, th...

Precision glass molding (PGM) technology, as an efficient and straightforward method for producing glass lenses, has been widely applied in the mass production of aspheric glass lenses. However, molding complex surfaces such as free-form and array surfaces is still in its infancy. To reveal the variations of temperature and stress of microlens arra...

Royal Belum State Park (RBSP) is located north of Perak state. RBSP was gazette under the Enactment of National Forestry Act 1984. RBSP is notably rich in biodiversity and is home to endemic species for various flora and fauna that are susceptible to climate change. This study explores the precipitation of RBSP that can be the guideline for mitigat...

Network signal coordination control is a crucial means to improve the traffic operation efficiency of the overall roadway network. Accurate identification of critical paths does play an important role in determining the scope of network coordination control. Therefore, this paper proposed the definition of critical path from the perspective of traf...

Characterizing quantum processes is crucial for the execution of quantum algorithms on available quantum devices. A powerful framework for this purpose is the Quantum Model Learning Agent (QMLA) which characterizes a given system by learning its Hamiltonian via adaptive generations of informative experiments and their validation against simulated m...

The global effort to transition from fossil fuels to renewable energy sources results in the closure of surface and underground coal mines, subsequently affecting the environment, society, and the economy. Land uplift is one of the challenges since the coal mine closure in Germany. Using computational modeling and simulation helps understand the lo...

Effective enforcement of laws and regulations hinges heavily on robust inspection policies. While data-driven approaches to testing the effectiveness of these policies are gaining popularity, they suffer significant drawbacks, particularly a lack of explainability and generalizability. This paper proposes an approach to crafting inspection policies...