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Cavitation nozzle is the core component of cavitation generator. It promotes cavitation by its internal special structure, producing bubble and improving the impact force of jet. The structural characteristics directly affect the quality of the cavitation jet. Therefore, the study of internal structure of nozzle is helpful to improve the performance of nozzle. Based on CFD software, taking the Helmholtz...
Phased-mission system (PMS) can have a number of mission phases with different system configurations of components. In engineering practice, there exist PMSs that have phases with time redundancy, meaning that the system is required to work in operational state for only a given duration of time within such phase, instead of all the phase duration like traditional PMS. For such complex PMS, it is not...
Power hardware-in-the-loop modeling (PHIL) is one of advanced approach for test automation and verification of complex circuits and systems. This approach is most well used in power networks and power-trains. PHIL modeling is supposed part of a system is software model whether the other part is hardware item under test. A special interface algorithm supports interaction between computer model and...
The paper presents a design of SRAM circuit using CNTFET transistors. The complete model describing CNTFET, developed in Stanford University is modified for the purpose of designing a 6T (2×2) SRAM memory cell. The simulation results of the CNTFET SRAM memory cell manifest usability and applicability of the modified CNTFET model in designing digital circuits. The simplified CNTFET model is coded in...
In this paper, a fuzzy model of opinion dynamics is built to extend the classical Hegelsman-Krause model. The new model takes into account the factors of the uncertainty of agents' opinions and describes the interaction mechanism for the social group by using fuzzy set theory. The confidence levels of social agents are also modeled by a fuzzy variable. The evolution of fuzzy opinions of the social...
This paper introduces a multi-model approach for the identification of the pumping (water distribution) system in a two tank process, namely ASTANK2. An improved hill climbing algorithm is applied, in order to find the optimal structural indices of the identification models. A simulator that integrates the proposed numerical models and the analytical models developed in authors' previous work is implemented...
Air Data Computer (ADC) is an electronics device computes air data flight parameters. The objective of this paper is to analyze, simulate, and propose hardware implementation module for the Air Data Computer. Simulation of ADC model has been faced by two problems. The first one was to choose true values of dynamic temperature because it depends on flight altitude and airspeed. The second problem is...
We present an implementation in graphical processing units of a numerical algorithm for the simulation of the nonlinear propagation of pulses in optical fibers. The implementation uses NVidia's cuFFT library to perform the large number of FFTs calculations required and parallelizes all vector sums and products. We show up to 50 × speedups as compared to a single-core implementation on a PC.
In this paper, an efficient passivity enforcement algorithm for S-parameter based macromodels is proposed. The approach is based on the perturbation of the imaginary eigenvalues of the Hamiltonian Matrix. The CPU cost savings are obtained by selective computation and perturbation of a subset of the imaginary eigenvalues. The proposed approach is shown to be efficient compared to existing state of...
A cloud-based web service is presented for users to machine-generate network simulation programs for the opensource ns-3 network simulator. The service takes as input a userprovided network system model and delivers as output an ns-3 'main' program. An accompanying user-based modeling tool provides a graphical user interface for constructing and editing models of four layer Internet systems in terms...
Wind power generation with permanent magnet synchronous machines (PMs) has been made possible using power electronic converters. With the increasing use of such systems, the numerically efficient modeling and simulation are of critical importance. As an alternative to traditional qd models, the coupled-circuit phase-domain (CCPD) and voltage-behind-reactance (VBR) models have been recently proposed...
Accurate numerical models of a given antenna can be derived from measurements using the inverse source technique [1–3]. Using this technique, measured antenna patterns can currently be imported and used as numerical sources in a number of commercial Computational Electromagnetic (CEM) solvers [4–9]. This method has been validated experimentally and the achievable accuracy investigated for both stand-alone...
Electrified guided vehicles are normally equipped with regenerative braking devices, while traction lines are supplied by non-reversible substation, thus allowing braking energy recovery only if nearby other vehicles are absorbing power. To enhance the effectiveness of regenerative braking, some energy storage can be installed along the line. Evaluation of its cost effectiveness requires time domain...
This work investigated nine popular integration algorithms and simulated the DC-DC boost converters, with and without parasitic elements, operating in continuous conduction mode (CCM). The off-line simulations were performed under the Matlab environment. The methodology consisted of firstly, deriving the state-space model of the converter and then deriving its small-signal average model. The average...
The development of accurate and realistic models of Ground Penetrating Radar (GPR) antennas is being driven by research into quantitative amplitude information from GPR, improved GPR antenna designs, and better-performing forward simulations that can feed into inversion algorithms. The Finite-Difference Time-Domain (FDTD) method and Finite-Integration technique (FIT) are popular numerical methods...
Electromagnetic models of measured antenna can be accurately computed by the inverse source technique, implemented in the MVG software INSIGHT [1–5]. The measurement processing is based on the expansion of the measured field using equivalent currents [7–10]. A recently created link enable the INSIGHT to export the electromagnetic model to a number of commercial Computational Electromagnetic (CEM)...
Optimization of large-scale complex systems often involves high-fidelity computational simulation models that are very time-consuming. As a result, the number of objective function evaluations is often very limited and presents a major hurdle for optimization. Previous works on a new framework known as ordinal transformation (OT) provides a method that makes use of a low-fidelity approximate model...
Tensors are a multi-linear generalization of matrices to their d-way counterparts, and are receiving intense interest recently due to their natural representation of high-dimensional data and the availability of fast tensor decomposition algorithms. Given the input-output data of a nonlinear system/circuit, this paper presents a non-linear model identification and simulation framework built on top...
Motion and movement are central aspects in 3D simulation. In virtual systems, motion can be modelled in various ways. Aspects and constraints like the desired level of abstraction, modelling and computational effort, numerical properties, and capabilities of the simulation system influence the choice of model. In this paper, we provide an overview of different methods for modelling and simulating...
A 3rd order lumped element circuit for the simulation of the JEDEC JS-001-2014 HBM ESD pulse is proposed. The resulting current pulse is analytically computed with a state space model of the circuit. For the purpose of verification a computer algebra system is used, solving and checking the model if it generates a current pulse which fulfils the requirements. The values of the voltage pulse, resistor,...
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