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Distributed Adaptive Synchronization in Euler Lagrange Networks with Uncertain Interconnections

Tao, T. (author), Roy, Spandan (author), De Schutter, B.H.K. (author), Baldi, S. (author)

In this work we propose a new practical synchronization protocol for multiple Euler Lagrange (EL) systems without structural linear-in-the-parameters (LIP) knowledge of the uncertainty and where the agents can be interconnected before control design by unknown state-dependent interconnection terms. This setting is meant to overcome two...

journal article 2024

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Asynchronous Hyperbolic UWB Source-Localization and Self-Localization for Indoor Tracking and Navigation

Chiasson, David (author), Lin, Yuan (author), Kok, M. (author), Shull, Peter (author)

Hyperbolic localization measures the time difference of arrivals (TDOAs) of signals to determine the location of a wireless source or receiver. Traditional methods depend on precise clock synchronization between nodes so that time measurements from independent devices can be meaningfully compared. Imperfect synchronization is often the dominant...

journal article 2023

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The multi-trip container drayage problem with synchronization for efficient empty containers re-usage

Fazi, S. (author), Choudhary, Sourabh Kumar (author), Dong, Jing Xin (author)

We study a typical daily drayage problem concerning the last-mile logistics at seaports for inland container supply chains. A set of trucks available at an inland container terminal must fulfil shippers’ requests of transporting containers within time windows and, to do so, can perform multiple daily trips. A request may entail picking up or...

journal article 2023

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Stochastic Stability of Discrete-time Phase-coupled Oscillators over Uncertain and Random Networks

Jafarian, M. (author), Mamduhi, Mohammad H. (author), Johansson, Karl H. (author)

This article studies stochastic relative phase stability, i.e., stochastic phase-cohesiveness, of discrete-time phase-coupled oscillators. The stochastic phase-cohesiveness in two types of networks is studied. First, we consider oscillators coupled with 2π-periodic odd functions over underlying undirected graphs subject to both multiplicative...

journal article 2023

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A Synchronized Switch Harvesting Rectifier With Reusable Storage Capacitors for Piezoelectric Energy Harvesting

Yue, X. (author), Du, S. (author)

Synchronized ac-dc rectifiers are widely used for energy rectification in piezoelectric energy harvesting (PEH), which have to employ a bulky inductor or some dedicated flying capacitors for high energy conversion efficiency. This article proposes a synchronized switch harvesting on shared capacitors (SSHSC) rectifier achieving synchronized...

journal article 2023

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Temporal synchronization of radar and lidar streams

Aledo Ortega, D. (author), Manjunath, T. (author), Rajan, R.T. (author), Maksimiuk, Darek (author), van Leuken, T.G.R.M. (author)

In multi-sensor systems, several sensors produce data streams, commonly, at different frequencies. If they are let running wild without synchronization, after a period of time, they are likely to be disordered, presenting as simultaneous measures that have been recorded at different times. That can be disastrous in many data fusion applications....

conference paper 2022

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Frequency Augmented Clock Synchronization for Space-based interferometry

Abel, Felix (author), Sundaramoorthy, P.P. (author), Rajan, R.T. (author)

Recently, an increase in distributed space systems and a rise in number of nodes in such systems is observed in numerous space applications, for example space-based interferometry. Such applications pose stringent demands on time synchronization which can be challenging to achieve for satellite networks that lack an absolute time reference...

conference paper 2022

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Stability and Accuracy Analysis of a Distributed Digital Real-Time Co-simulation Infrastructure

Barbierato, L. (author), Pons, Enrico (author), Mazza, Andrea (author), Bompard, Ettore (author), Subramaniam Rajkumar, Vetrivel (author), Palensky, P. (author), Macii, Enrico (author), Bottaccioli, Lorenzo (author), Patti, Edoardo (author)

Cosimulation techniques are gaining popularity amongst the power system research community to analyze future scalable smart grid solutions. However, complications such as multiple communication protocols, uncertainty in latencies are holding up the widespread usage of these techniques for the power system analysis. These issues are even...

journal article 2022

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On the drivers of demand for innovative freight transportation services

Khakdaman, M. (author), Rezaei, J. (author), Tavasszy, Lorant (author)

Contemporary innovations in freight transportation and logistics are instrumental in achieving more integrated, efficient, and sustainable services in the global market. While much attention is going to how contemporary innovations, including technology-enabled and management innovations, change the supply of services, little work is done on...

journal article 2022

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Event-Triggered Adaptive Fault-Tolerant Synchronization Tracking Control for Multiple 6-DOF Fixed-Wing UAVs

Zhang, Boyang (author), Sun, Xiuxia (author), Liu, Shuguang (author), Lv, Maolong (author), Deng, Xiongfeng (author)

In contrast with most existing results concerning unmanned aerial vehicles (UAVs) wherein two-degree or only attitude/longitudinal dynamics are considered, this article proposes an event-triggered cooperative synchronization fault-tolerant control (FTC) methodology for multiple fixed-wing UAVs whose dynamics are six-degree-of-freedom (DOF)...

journal article 2022

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Nonlinear integral coupling for synchronization in networks of nonlinear systems

Pavlov, Alexey (author), Steur, E. (author), van de Wouw, Nathan (author)

This paper presents a novel approach to (controlled) synchronization of networked nonlinear systems. For classes of identical single-input–single-output nonlinear systems and networks, including oscillator networks, we propose a systematic design procedure (with generic as well as constructive conditions) for specifying nonlinear coupling...

journal article 2022

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Improving the Utilization of Regenerative Energy and Shaving Power Peaks by Railway Timetable Adjustment

Wang, P. (author), Bešinović, Nikola (author), Goverde, R.M.P. (author), Corman, F. (author)

Employing regenerative braking in trains contributes to reducing the amount of energy used, especially when applied to commuter trains and to those used on very dense suburban networks. This paper presents a method to fine-tune the periodic timetable to improve the utilization of regenerative energy and to shave power peaks while maintaining...

journal article 2022

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A review of public transport transfer coordination at the tactical planning phase

Liu, Tao (author), Cats, O. (author), Gkiotsalitis, Konstantinos (author)

While transferring between public transport services has a negative impact on the level-of-service, it is an inevitable feature of public transport networks. Transfer coordination can help reduce passenger transfer waiting times and improve service connectivity. In this paper, we systematically review the literature on transfer coordination...

review 2021

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Cyclic communication in adaptive strategies to platooning: the case of synchronized merging

Liu, Di (author), Baldi, S. (author), Jain, V. (author), Yu, Wenwu (author), Frasca, Paolo (author)

Recently proposed adaptive platooning strategies for connected automated vehicles are able to cope with uncertain vehicle parameters (uncertain driveline time constants), but can handle only acyclic graphs like look-ahead graphs. This prevents from enhancing platooning protocols with synchronized merging maneuvers, where cyclic communication...

journal article 2021

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Adaptive leader-follower synchronization over heterogeneous and uncertain networks of linear systems without distributed observer

Azzollini, Ilario Antonio (author), Yu, Wenwu (author), Yuan, Shuai (author), Baldi, S. (author)

A challenging task in network synchronization is steering the network toward a coherent solution, when the dynamics of the constituent systems are heterogeneous and uncertain. In this situation, synchronization can be achieved via adaptive protocols (with adaptive feedback gains or adaptive coupling gains, or both). However, as state-of-the...

journal article 2021

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Where shall we sync? Clustering passenger flows to identify urban public transport hubs and their key synchronization priorities

Yap, M.D. (author), Luo, D. (author), Cats, O. (author), van Oort, N. (author), Hoogendoorn, S.P. (author)

Minimizing passenger transfer times through public transport (PT) transfer synchronization is important during tactical planning and real-time control. However, there are computational challenges for solving this Timetable Synchronization Problem (TSP) for large, real-world urban PT networks. Hence, in this study we propose a data-driven,...

journal article 2019

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Using passenger flows to determine key interchange connections for public transport synchronization

Yap, M.D. (author), Luo, D. (author), Cats, O. (author)

For large urban networks and hubs, optimizing transfer synchronization becomes computationally challenging. The objective of this paper is therefore to develop a generic, data-driven methodology to determine the key line/direction-combinations to synchronize based on passenger flows. We developed an approach to detect communities of directional...

conference paper 2018

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Human-robot cooperative object manipulation with contact changes

Gienger, Michael (author), Ruiken, Dirk (author), Bates, T. (author), Regaieg, Mohamed (author), Meibner, M. (author), Kober, J. (author), Seiwald, Philipp (author), Hildebrandt, Arne Christoph (author)

This paper presents a system for cooperatively manipulating large objects between a human and a robot. This physical interaction system is designed to handle, transport, or manipulate large objects of different shapes in cooperation with a human. Unique points are the bi-manual physical cooperation, the sequential characteristic of the...

conference paper 2018

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Dichotomy and stability of disturbed systems with periodic nonlinearities

Smirnova, Vera B. (author), Proskurnikov, A.V. (author), Utina, Natalia V. (author), Titov, Roman V. (author)

Systems that can be decomposed as feedback interconnections of stable linear blocks and periodic nonlinearities arise in many physical and engineering applications. The relevant models e.g. describe oscillations of a viscously damped pendulum, synchronization circuits (phase, frequency and delay locked loops) and networks of coupled power...

conference paper 2018

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Mutually Coupled Time-to-Digital Converters (TDCs) for Direct Time-of-Flight (dTOF) Image Sensors

Ronchini Ximenes, A. (author), Padmanabhan, P. (author), Charbon-Iwasaki-Charbon, E. (author)

Direct time-of-flight (dTOF) image sensors require accurate and robust timing references for precise depth calculation. On-chip timing references are well-known and understood, but for imaging systems where several thousands of pixels require seamless references, area and power consumption limit the use of more traditional synthesizers, such as...

journal article 2018