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Multi-parameters optimization for electromigration in WLCSP solder bumps

Du, L. (author), Deng, Shanliang (author), Cui, Z. (author), Poelma, René H. (author), Beelen-Hendrikx, Caroline (author), Zhang, Kouchi (author)

In this study, we combined finite element method (FEM) based on Ansys and Noesis Optimus software to investigate the effect of bump structures and loading conditions on the electromigration properties of solder bumps in WLCSP. A numerical model considering current density, vacancy concentration, stress and temperature was utilized to calculate...

conference paper 2024

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An Inverted Doherty Power Amplifier Insensitive to Load Variation With an Embedded Impedance Sensor in Its Output Power-Combining Network

Singh, G.D. (author), Nemati, Hossein Mashad (author), Alavi, S.M. (author), de Vreede, L.C.N. (author)

This article presents an inverted Doherty power amplifier (IDPA) made load insensitive up to 2:1 voltage standing wave ratio (VSWR) across its fractional bandwidth with a very compact wideband impedance sensor embedded in its output power-combining network (OPCN). To correct for load variation, a low-loss tunable resonator (TR) is used to...

journal article 2023

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Experimental Validation of Torque-Based Control for Realistic Handwheel Haptics in Driving Simulators

Damian, Mircea (author), Shyrokau, B. (author), Carrera Akutain, Xabier (author), Happee, R. (author)

A realistic steering feel is one of the key elements to guarantee fidelity on a driving simulator in general, and in particular to replicate on-centre vehicle handling. This requires precise modelling of the steering dynamics, a high bandwidth control loading system, and coupling of virtual and physical components in agreement with...

journal article 2022

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Periodic Load Estimation of a Wind Turbine Tower using a Model Demodulation Transformation

Pamososuryo, A.K. (author), Mulders, S.P. (author), Ferrari, Riccardo M.G. (author), van Wingerden, J.W. (author)

The ever-increasing power capacities of wind turbines promote the use of tall and slender turbine towers. This poses a challenge from a fatigue loading perspective by the relocation of the first and lightly-damped tower side-side natural frequency into the turbine operating regime, promoting its excitation during nominal operation. The...

conference paper 2022

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Interfacial properties of Cu/SiO2 using a multiscale modelling approach in electronic packages

Cui, Z. (author), Chen, Xianping (author), Fan, Xuejun (author), Zhang, Kouchi (author)

Interfacial properties of Cu/SiO2 in semiconductor devices has continued to be the subject of challenging study for many years because of its difficulties in experimentally quantifying the critical strength of interface. In this paper, a multi-scale modeling approach is built to characterize the interfacial properties between Cu and SiO2. In...

conference paper 2018

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Interfacial Failure Characterization of Electronic Packaging Component Using a Multiscale Modelling Approach

Cui, Z. (author), Zhang, Yingying (author), Yang, Qun (author), Zhang, Kouchi (author), Chen, Xianping (author)

Interfacial properties of Cu/SiO<sub>2</sub> in semiconductor devices has been a challenging study for many years because of its difficulties in experimentally quantifying the critical strength of interface. In this paper, a multi-scale modeling approach is built to characterize the interfacial properties between Cu and SiO<sub>2</sub>. The...

conference paper 2018

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Efficient balancing by effort-based activation of demand response services

Claessen, Felix N. (author), Kaisers, Michael (author), la Poutré, J.A. (author)

We present a unified model for flexibility services in the power system, identify two existing categories (ramping and loading) and introduce a new category (stalling). Each service is characterised by duration, capacity and effort, with associated prices. We show that the effort of stalling, measurable in kWh2, is a significant cost component...

conference paper 2017

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Viscoplasticity for instabilities due to strain softening and strain-rate softening

Wang, W.M. (author), Sluys, L.J. (author), De Borst, R. (author)

journal article 1997

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A gradient-enhanced damage approach to fracture

De Borst, R. (author), Benallal, A. (author), Heeres, O.M. (author)

journal article 1996

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Some observations on localisation in non-local and gradient damage models

Peerlings, R.H.J. (author), De Borst, R. (author), Brekelmans, W.A.M. (author), De Vree, J.H.P. (author), Spee, I. (author)