<title>Abstract</title> This paper proposes a hybrid prediction method for the conducted electromagnetic interference (EMI) of AC-DC power converter. Under this method, equivalent EMI model converter system is established to separate source and conduction path in For front stage rectifier with T type topology, topology simplification applied develop time-domain consideration given variable slope characteristics ringing effects. When modeling DC-DC stage, main time domain built from...

Abstract Rotational machinery is a common presence in dust still production, and the occurrence of operational failures components like engines turbine blades necessitates effective measures. To solve this challenge, remote structural health monitoring using energy harvesting wireless sensors has been widely employed to realize self-powered sensing. This study proposes magnet-induced bi-stable rotational harvester (REH), which utilizes centrifugal effect broaden frequency bandwidth, enabling...

Design and modeling of a bi-laminate, Galfenol-driven composite beam is presented in which the elasticity adhesive layer considered. The optimal thickness ratio necessary to maximize tip deflection found by minimization internal energy beam. Model simulations show that use substrate material with high modulus leads larger deflections. Stainless steel was therefore utilized as experiments. In order reduce eddy currents, laminated silicon frame employed magnetize A dynamic model proposed...

A fully coupled simulation framework is developed to predict the dynamic characteristics of permanent magnet (PM) contactors. Dynamic inductance, magnetic field distribution, and mechanical motion are solved by coupling electric, magnetic, governing equations. The equations in weak forms Weak Form Partial Differential Equation module Comsol Multiphysics employed solve Influence PM taken into account considering remanent flux as a static potential. electromagnetic variables can be same...

This article presents a fully coupled, nonlinear model for the dynamic response of Galfenol-driven unimorph actuators in cantilever configuration. The hysteretic magnetomechanical behavior Galfenol is modeled using discrete energy-averaged model, and structural finite element method. weak form equations that describe bending are obtained principle virtual work. Since local strain stress nonlinearly coupled with both vertical horizontal displacements, solver developed to approximate...

On active bending structures, the actuation direction and excitation field are not same. Simple lumped parameter models inadequate to describe relationship between output displacement input field. In this paper, a dynamic distributed model is presented system dynamics of galfenol actuator. To consider nonlinearities hysteresis in bending, nonlinear magnetomechanical developed characterize hysteretic magnetostriction generated by layer. A real-time control strategy proposed compensate for...

A dynamic model is presented by coupling the structural dynamics of a Galfenol-driven unimorph beam with magnetostriction generated active layer. Weak form equations are obtained employing virtual work principle, and finite-element representation implemented through Galerkin discretization. In order to facilitate design controller, linearized constitutive law used describe Galfenol. finite-dimensional sliding-mode controller developed which accounts for frequency-dependent deviations damping...

The closing process of intelligent AC contactors can be affected by selection phase angle. A control strategy is proposed to compensate the influence at different angles. In order evaluate dynamic characteristics contactor, an impact detection sensor developed measure in rigid body collisions using PVDF. PVDF used between armature and static core electric contactor. stress sensitivity calibrated with a commercial force sensor. Experimental results show that duration collision around 0.5 ms...

Parallel assembly sequence planning (PASP) greatly impacts on efficiency of process. In traditional methods, large scale matrix calculation still limits PASP for complex products. A novel method is proposed to address this issue. To avoid calculation, the synchronized Petri net (SAPN) firstly established describe precedence relationships. Associated with SAPN model, process can be implemented via particle swarm optimization based bacterial chemotaxis (PSOBC). Characterized by an...

To improve fire prediction accuracy over existing methods, a double weighted naive Bayes with compensation coefficient (DWCNB) method is proposed for purposes. The characteristic attributes and attribute values are all to weaken the assumption that independent equally important. A was used compensate prior probability, five-level orthogonal testing employed properly design coefficient. model trained data collected from National Institute of Standards Technology (NIST) database. Simulation...

Image classification methods based on deep learning have been widely used in the study of nonintrusive load identification. However, process encoding electrical signals into images, how to fully retain features raw data and thus increase recognizability loads carried with very similar current are still challenging, loss will cause overall accuracy identification decrease. To deal this problem, paper proposes a method improved Gramian angular field (iGAF) ResNet18. In proposed method, fast...

A new approach considering the nonlinearity of electric core is proposed to analyze magnetic field and force 3D electromagnetic contactors. The nonlinear constitutive law established by measuring B-H curve experimentally. Finite element method u sed model responses system, in which Ampère's circuital implemented PDE weak form. In order force, measured incorporated with form equation numerical interpolation. Both static transient system are studied solving coupled equations step step....

The closing process of intelligent AC contactor can be affected by selection phase angle and the dynamic control strategy. A strategy is proposed to compensate influence at different angles. mathematical model establishe d analyzing characteristics contactor. Simulation experimental comparisons show that predict response effectively. relationship between end speed analyzed using measurements. implemented combining voltage zero crossing PWM section technology. input zero-crossing signal are...

This study addresses the design of a new type permanent magnet contactor, which uses forced breaking to overcome failure conditions. A multi‐objective optimisation method based on genetic algorithm is used contactor considering effects average closing time, impact energy, Joule heat and volume. Four prototypes have been fabricated according optimised parameters. control circuit developed increase reliability. The designed as two separate modules: normal working module protection module....

Magnetostrictive transducer (MT) is a highly integrated that enables magneto-mechanical energy conversion when outputting actuation motion or force. To ensure high efficiency, an impedance tracking control strategy proposed based on the variable stiffness tuning mechanism. The internal controlled to track change of load obtain matching for different working conditions, and thus increase efficiency. developed driven with magnetostrictive material Terfenol-D. By applying proper magnetic field,...

杨艳芳 2 陈定方 (1.温州大学浙江省低压电器工程技术研究中心 温州 325027； 2. 武汉理工大学港口物流技术与装备教育部工程研究中心 武汉 430063)

Circuit breakers (CBs) play an important role in distribution networks. According to IEC standards, protection characteristics need be investigated ensure reliability the manufacturing process. It is required from 60947 that instantaneous release shall verified with a test current at least 10 times greater than rated current. For large-capacity CB testing, converters large output current, high accuracy and fast response are needed. A indirect converter including four converting units matrix...

Giant magnetostrictive actuators (GMA) are widely applied in ultra-precision positioning. However, the accuracy of GMA positioning is intensively affected by hysteresis and nonlinearity giant materials. To characterize nonlinearity, The nonlinear model based on modified Preisach was established this paper. Since operation depends previous experimental data inversion algorithm operators, which always a complicated procedure, we proposed paper point-standard iterated instead extremum values...

Giant magnetostrictive actuator (GMA) is a kind of new-generation actuator. The application GMA limited due to the inherent hysteresis and nonlinearity. And response speed can not achieve satisfied effect. To solve problem, mathematical model was established in paper. According this model, PID controller designed developed. effect control be seen at end with analysis results. steady output both have been enhanced