In this paper, the aging characteristics and state-of-health (SOH) estimation of retired batteries were studied by leveraging electrochemical impedance spectroscopy (EIS) technique. A battery experiment was designed implemented to monitor process batteries, after which a comprehensive analysis collected EIS data conducted characterize corresponding properties batteries. Based on results, an equ...

A broadband Circuit Analogue (CA) absorber using double-circular-loop array is investigated in this paper. A simple equivalent circuit model is presented to accurately analyze this CA absorber. The circuit simulation of the proposed model agrees well with full-wave simulations. Optimization based the equivalent circuit model, is applied to design a single-layer circuit analogue absorber using d...

Battery management systems (BMS) are important for ensuring the safety, efficiency and reliability of a battery pack. Estimating internal equivalent circuit model (ECM) parameters battery, such as open voltage, resistance relaxation parameters, is crucial requirement in BMSs. Numerous approaches to estimating ECM have been reported literature. However, existing consider identification joint est...

Abstract— In this paper, input impedance of a vertical rod under lightning stroke is first computed by applying the method of moments (MoM) on the Maxwell’s equations. The circuit model is then achieved through applying modified vector fitting (MVF) on the computed input impedance. After then the equivalent circuit is again extracted for a few values of soil conductivity and rod radius. Finally...

Nonlinear acoustic damping is a key nonlinearity in miniature loudspeakers when the air velocity at high amplitude. Measurement of nonlinear beneficial for predicting and analyzing performance loudspeakers. However, general measuring methods impedance, such as standing-wave tube method or impedance method, are not applicable this scenario because coupled with other system nonlinearities. In stu...

Induction motor is the most popular load in the industry, it is very important to study about the effects of voltage quality on induction motor performance. One of the most important voltage quality problems in power system is voltage unbalance. This paper evaluates and compares two methods including finite element method (FEM) and equivalent electrical circuit simulation for investigation ...

Mathematical modeling is widely used for the time-and frequency-domain analysis of hydraulic systems. To explore complicated transients piping system under various operating conditions, different formulations equivalent circuit model (ECM) are systematically discussed in this study. In particular, comparative studies performed regarding restrictions on tempo-spatial discretization time-domain E...

To achieve accurate prediction of the nonlinear behavior lithium-ion battery, parameters battery model play a key role for dynamic performance, hence investigated have been estimated. In this work, electrical equivalent circuit (ECM) models used to simulate INR18650-20R response at 0°C, 25°C, and 45°C, respectively. The ECM are estimated using incremental open-circuit voltage (OCV) profile Trus...

─ A novel quarter-circle defected ground structure shape is introduced in this paper to design and implement an ultra-wide reject band low-pass filter (LPF). Moreover, an equivalent circuit model (ECM) is presented. The proposed LPF has small size and, a low insertion loss and a return loss less than -20 dB. Also, a round -20 dB suppression level ranging from 4 GHz to more than 20 GHz is achiev...