Relevant bibliographies by topics / Partially synchronous system

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Partially synchronous system'

Author: Grafiati
Published: 4 June 2021
Last updated: 19 February 2022

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Journal articles on the topic "Partially synchronous system"

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PETERS, KIRSTIN, JENS-WOLFHARD SCHICKE-UFFMANN, URSULA GOLTZ, and UWE NESTMANN. "Synchrony versus causality in distributed systems." Mathematical Structures in Computer Science 26, no. 8 (December 23, 2014): 1459–98. http://dx.doi.org/10.1017/s0960129514000644.

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Given a synchronous system, we study the question whether – or, under which conditions – the behaviour of that system can be realized by a (non-trivially) distributed and hence asynchronous implementation. In this paper, we partially answer this question by examining the role of causality for the implementation of synchrony in two fundamental different formalisms of concurrency, Petri nets and the π-calculus. For both formalisms it turns out that each ‘good’ encoding of synchronous interactions using just asynchronous interactions introduces causal dependencies in the translation.
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Abedi, Samira, Chau-Chyun Chen, and Siva A. Vanapalli. "Catastrophic thermal destabilization of two-dimensional close-packed emulsions due to synchronous coalescence initiation." Soft Matter 16, no. 26 (2020): 6032–37. http://dx.doi.org/10.1039/d0sm00649a.

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The mechanism causing thermal destabilization of emulsions is investigated. During heating, synchronous coalescence is initiated between partially crystalline droplets creating a system-spanning network which phase separates.
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Zhang, Milu, Tianzhen Wang, Tianhao Tang, Zhuo Liu, and Christophe Claramunt. "A Synchronous Sampling Based Harmonic Analysis Strategy for Marine Current Turbine Monitoring System under Strong Interference Conditions." Energies 12, no. 11 (June 3, 2019): 2117. http://dx.doi.org/10.3390/en12112117.

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Affected by high density, non-uniform, and unstructured seawater environment, fault detection of Marine Current Turbine (MCT) faces various fault features and strong interferences. To solve these problems, a harmonic analysis strategy based on zero-crossing estimation and Empirical Mode Decomposition (EMD) filter banks is proposed. First, the detection problems of rotor imbalance fault under strong interference conditions are described through an analysis of the fault mechanism and operation environment of MCT. Therefore, against various fault features, a zero-crossing estimation is proposed to calculate instantaneous frequency. Last, and in order to solve the problem that the frequency and amplitude of the operating parameters are partially or completely covered by interference, a band-pass filter based on EMD is used, together with a characteristic frequency selected by a Pearson correlation coefficient. This strategy can accurately detect the multiplicative faults under strong interference conditions, and can be applied to the MCT fault detection system. Theoretical and experimental results verify the effectiveness of the proposed strategy.
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Changsheng, Zhu. "Experimental Investigation into the Instability of an Over-Hung Rigid Centrifuge Rotor Partially Filled With Fluid." Journal of Vibration and Acoustics 124, no. 4 (September 20, 2002): 483–91. http://dx.doi.org/10.1115/1.1505027.

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The objective of this paper is to experimentally investigate the instability of an over-hung rigid centrifuge rotor partially filled with fluid. Specific emphasis has been placed on the developing process of rotor instability, the dynamical behavior of the rotor system while the instability occurs, and the frequency and direction of rotor whirl within the unstable region of rotational speeds. The effects of fluid-fill ratio on the rotor whirl frequency, the extent of the unstable region of rotational speeds, and the rotor imbalance are also studied. The detailed results clarify some issues and show some new phenomena on the instability of a rotor partially filled with fluid. The phenomena include: sub-synchronous frequency that does not result in instability of the rotor system and disappears in the unstable region at the larger fluid-fill ratios; different whirl frequencies entering the unstable region for slowly increasing and decreasing rotational speed operations; variable whirl frequency within the unstable region; hysteresis at the upper bound of the unstable region; and a break-down of the fluid free-surface.
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Edwards, S. A., K. Gall, M. Shanks, and H. Hamilton. "The effect of grouping time and gonadotrophin treatment on lactational oestrus in multisuckled sows." Proceedings of the British Society of Animal Science 1995 (March 1995): 30. http://dx.doi.org/10.1017/s0308229600027999.

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Loose housing of sows and their litters during lactation and removal of the need for early weaning offers substantial benefits for both animal welfare and cost of production. However, commercial application of such a system is dependent on achieving early and synchronous pregnancy in lactating sows. It is known that the occurrence of lactational oestrus can be facilitated by the combined stimuli of grouping, a high plane of nutrition and the presence of a mature boar. However these stimuli were only partially successful in inducing synchronised oestrus in an earlier experiment (Hatet et al, 1994). Administration of exogenous gonadotrophin to newly weaned sows has been shown to shorten and reduce variation in weaning to oestrus interval (Lancaster et al, 1985). The endocrine response of lactating sows to exogenous gonadotrophin has been shown to vary with stage of lactation (Britt et al, 1985). In this experiment, the role of these two factors in the successful induction of early and synchronous pregnancy in multisuckled sows was investigated.
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LI, ZHEN, SIU-CHUNG WONG, CHI K. TSE, and GRACE CHU. "BIFURCATION IN WIND ENERGY GENERATION SYSTEMS." International Journal of Bifurcation and Chaos 20, no. 11 (November 2010): 3795–800. http://dx.doi.org/10.1142/s0218127410028070.

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This letter reveals the possibility of Hopf bifurcation in a grid-connected wind energy generation system which handles an unbalanced loading. The wind energy generation system consists of a typical doubly fed induction generator (DFIG) which allows variable speed operation by using partially rated back-to-back quadruple active and reactive power PWM converters. Many control schemes reported in the literature are designed to solve some specific control problems associated with DFIG and have rarely been tested for general stability. Specifically, bifurcation analysis of the system has not been reported so far. We study the system stability in terms of the magnitude of some unwanted oscillation of the voltage link capacitor under a practical scenario where the system interacts indirectly with unbalanced single-phase constant power loads through the power grid. In this letter, the rotor speed of the DFIG is used as a variation parameter for bifurcation analysis. Bifurcation diagram of the voltage link capacitor indicates a Hopf-like bifurcation of the system in super-synchronous operation. This clearly explains the instability phenomenon of the practical DFIG system when unbalanced single-phase constant power loads are connected to the connecting grid.
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Islam, Haidar, Saad Mekhilef, Noraisyah Mohamed Shah, Tey Kok Soon, Addy Wahyudie, and Mahrous Ahmed. "Improved Proportional-Integral Coordinated MPPT Controller with Fast Tracking Speed for Grid-Tied PV Systems under Partially Shaded Conditions." Sustainability 13, no. 2 (January 15, 2021): 830. http://dx.doi.org/10.3390/su13020830.

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When a photovoltaic (PV) system is exposed to physical objects and cloud coverage and connected to bypass diodes, a partial shading condition (PSC) occurs, which causes a global maximum power point (GMPP) and numerous local maximum power points (LMPPs) on the power-voltage (P-V) curve. Unlike conventional MPPT techniques that search for multiple LMPPs on the P-V curve, it is possible to track GMPP straightaway by designing a simple but robust MPPT technique that results in faster tracking speed and low power oscillations. Hence, in this study, an improved proportional-integral (PI) coordinated Maximum Power Point Tracking (MPPT) algorithm is designed to enhance the conversion efficiency of a PV system under PSC with fast-tracking speed and reduced power oscillations. Here, PI controllers are used to mitigating the steady-state errors of output voltage and current of PV system that later on passed through an incremental conductance (INC) algorithm to regulate the duty cycle of a dc–dc boost converter in order to ensure fast MPPT process. The PV system is integrated with the grid through an H-bridge inverter, which is controlled by a synchronous reference frame (SRF) controller. Tracking speed and steady-state oscillations of the proposed MPPT are evaluated in the MATLAB/Simulink environment and validated via a laboratory experimental setup using Agilent solar simulator and dSPACE (DS1104) controller. Results show that the proposed MPPT technique reduces the power fluctuations of PV array significantly and the tracking speed of the proposed method is 13% and 11% faster than the conventional INC and perturb and observe (P&O) methods respectively under PSCs.
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Marchgraber, Jürgen, Christian Alács, Yi Guo, Wolfgang Gawlik, Adolfo Anta, Alexander Stimmer, Martin Lenz, Manuel Froschauer, and Michaela Leonhardt. "Comparison of Control Strategies to Realize Synthetic Inertia in Converters." Energies 13, no. 13 (July 6, 2020): 3491. http://dx.doi.org/10.3390/en13133491.

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The increasing amount of renewable energy sources in the electrical energy system leads to an increasing number of converter-based generators connected to the electrical power grid. Other than conventional power plants that are often connected to the grid via synchronous generators, converter-based generators do not provide mechanical inertia intrinsically. Therefore, ensuring frequency stability in the electrical power grid might become even more difficult in the future. With the concept of synthetic inertia, the converter-based generators partially imitate the behavior of conventional generators. By implementing such a concept in converters, they are capable of contributing to frequency stability as well. This paper compares two strategies to realize synthetic inertia by modeling converter-based generators in MATLAB/SIMULINK and simulating their behavior in a small Microgrid. The results prove that any kind of realization of synthetic inertia helps to improve frequency stability. Each of the two investigated strategies may have their scope of application in a future electrical energy system.
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Townsend, Kirk F., Michelle S. Nelson, Tammy M. Rittenour, and Joel L. Pederson. "Anatomy and evolution of a dynamic arroyo system, Kanab Creek, southern Utah, USA." GSA Bulletin 131, no. 11-12 (May 2, 2019): 2094–109. http://dx.doi.org/10.1130/b35195.1.

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Abstract Many alluvial valleys in the American Southwest are entrenched within continuous arroyos, and stratigraphic evidence indicates that these fluvial systems experienced repeated periods of entrenchment and aggradation during the mid- to late-Holocene. Previous research suggests arroyo dynamics were regionally quasi-synchronous, implying that they were driven by allogenic forcing due to hydroclimatic fluctuations. However, several of these interpretations rely on records with limited age control and include distal correlations across the American Southwest. While hydroclimatic variability must exert some role, autogenic mechanisms related to catchment-specific geomorphic thresholds are hypothesized to partially control the timing of arroyo dynamics. If driven by autogenic processes, episodes of arroyo cutting and filling may not be regionally contemporaneous. Recent improvements in dating methods permit more detailed reconstructions of the timing and evolution of arroyo dynamics, allowing for a more nuanced assessment of these competing hypotheses. Here we present a uniquely large and focused chronostratigraphic data set from two alluvial reaches of Kanab Creek, located in the Grand Staircase region of southern Utah. Episodes of prehistoric arroyo cutting and filling are reconstructed from 27 sites through recognition of soils and buttressed unconformities in the arroyo-wall stratigraphy, and age control derived from 54 optically stimulated luminescence (OSL) ages and 50 radiocarbon ages. Our chronostratigraphic data set indicates five periods of channel aggradation occurred since ca. 6.0 ka, with each interrupted by an episode of arroyo entrenchment. Repeated aggradation to a similar channel elevation suggests attainment of a threshold profile, and comparison of the pre-entrenchment longitudinal profile with the modern arroyo channel demonstrates that changes between end-member entrenched and aggraded states are expressed in channel concavity and slope. We propose that arroyo dynamics are partially driven by sediment supply and the rate of channel aggradation, and that these systems must approach complete re-filling before they become sensitive to incision. Entrenchment itself appears to be associated with rapid transitions from pronounced decadal-scale aridity to pluvial (wetter) periods. Not all such hydroclimatic fluctuations are associated with arroyo entrenchment, which highlights the importance of threshold controls on the behavior of these systems. The collective period of “dynamic instability” characterized by epicycles of arroyo entrenchment and aggradation did not initiate until the mid-Holocene, when a climatic shift toward warmer and drier conditions likely increased fine-grained sediment supply to the fluvial system.
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Baranov, A. "Spain’s party system development trends in the context of the electoral cycle 2019." Cuadernos Iberoamericanos, no. 4 (December 28, 2019): 36–42. http://dx.doi.org/10.46272/2409-3416-2019-4-36-42.

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The topicality of the article is that the party system of Spain is undergoing serious transformations, the positioning of political forces and their ideologies, the organizational structure are changing significantly. National parliamentary elections are held for the fourth time in 4 years, which is unique to the countries of consolidated democracy. Trends in the development of Spain are relevant for cross- national comparisons of party systems. Methods – systems approach, synchronous comparative analysis, a secondary analysis of the results of opinion polls, mapping of party support in the elections. Materials: regulations; statements by party leaders; pre-election programs; results of sociological surveys; statistics on the results of elections. Results: The crisis of the party system in Spain is peculiar to the transition from a bipartisan model to a model of moderate pluralism, increased fragmentation, significant volatility, and the dependence of the main national parties on the support of regional parties. In the electoral cycle of 2019, the party system of Spain is a system of moderate pluralism (5 leading actors) with the growing role of regional parties, pragmatic coalitions are inevitable for creating a government. The economic recovery of 2014–2019 influenced the decline in the influence of “Unidos Podemos”, their electorate partially returned to the PSOE. In European and subnational elections, these trends are even more pronounced due to the format of electoral systems and the isolation of regional party systems. The threefold structure of the Spanish electorate, distributed mainly among left-leaning centers, center-right and regional nationalists, is preserved. An analysis of the statistical results of the elections and questionnaires proves an inversely correlated relationship between the level of support for the PSOE and “Unidos Podemos” in the center-left segment, and the level of support for the People’s Party, “Citizens” and “Vox” in the center-right camp. The influence of parties is extremely uneven across autonomous communities, and unevenness is increasing. The increase in the instability of the party system in Spain is predicted due to the growing influence of new parties and the underdeveloped culture of parliamentary coalitions. This process increases the chances of Catalan nationalists. A radical reform of the political system of Spain is brewing; the electorate of the left parties expresses the greatest demand for reform.
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Dissertations / Theses on the topic "Partially synchronous system"

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Wang, Jiaqi. "Time Bounds for Shared Objects in Partially Synchronous Systems." Thesis, 2011. http://hdl.handle.net/1969.1/ETD-TAMU-2011-12-10214.

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Shared objects are a key component in today's large distributed systems. Linearizability is a popular consistency condition for such shared objects which gives the illusion of sequential execution of operations. The time bound of an operation is the worst-case time complexity from the operation invocation to its response. Some time bounds have been proved for certain operations on linearizable shared objects in partially synchronous systems but there are some gaps between time upper bound and lower bound for each operation. In this work, the goal is to narrow or eliminate the gaps and find optimally fast implementations. To reach this goal, we prove larger lower bounds and show smaller upper bounds (compared to 2d for all operations in previous folklore implementations) by proposing an implementation for a shared object with an arbitrary data type in distributed systems of n processes in which every message delay is bounded within [d-u, d] and the maximum skew between processes' clocks is epsilon. Considering any operation for which there exist two instances such that individually, each instance is legal but in sequence they are not, we prove a lower bound of d + min{epsilon, u, d/3}, improving from d, and show this bound is tight when epsilon < d/3 and epsilon < u. Considering any operation for which there exist k instances such that each instance separately is legal and any sequence of them is legal, but the state of the object is different after different sequences, we prove a lower bound of (1-1/k)u, improving from u/2, and show this bound is tight when k = n. A pure mutator only modifies the object but does not return anything about the object. A pure accessor does not modify the object. For a pure mutator OP1 and a pure accessor OP2, if given a set of instances of OP1, the state of the object reflects the order in which the instances occur and an instance of OP2 can detect whether an instance of OP1 occurs, we prove the sum of the time bound for OP1 and OP2 is at least d + min{epsilon, u, d/3}, improving from d. The upper bound is d + 2*epsilon from our implementation.
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Book chapters on the topic "Partially synchronous system"

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Widder, Josef. "Booting Clock Synchronization in Partially Synchronous Systems." In Lecture Notes in Computer Science, 121–35. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-540-39989-6_9.

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Widder, Josef, Gérard Le Lann, and Ulrich Schmid. "Failure Detection with Booting in Partially Synchronous Systems." In Dependable Computing - EDCC 5, 20–37. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/11408901_3.

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Tekken Valapil, Vidhya, Sorrachai Yingchareonthawornchai, Sandeep Kulkarni, Eric Torng, and Murat Demirbas. "Monitoring Partially Synchronous Distributed Systems Using SMT Solvers." In Runtime Verification, 277–93. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-67531-2_17.

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Yingchareonthawornchai, Sorrachai, Duong N. Nguyen, Vidhya Tekken Valapil, Sandeep S. Kulkarni, and Murat Demirbas. "Precision, Recall, and Sensitivity of Monitoring Partially Synchronous Distributed Systems." In Runtime Verification, 420–35. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-46982-9_26.

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Larrea, Mikel, Sergio Arevalo, and Antonio Fernndez. "Efficient Algorithms to Implement Unreliable Failure Detectors in Partially Synchronous Systems." In Lecture Notes in Computer Science, 34–49. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/3-540-48169-9_3.

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Wyss, Rémy, Frédéric Boniol, Julien Forget, and Claire Pagetti. "A Synchronous Language with Partial Delay Specification for Real-Time Systems Programming." In Programming Languages and Systems, 223–38. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-35182-2_16.

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Manovit, Chaiyasit, Chatchawit Aporntewan, and Prabhas Chongstitvatana. "Synthesis of synchronous sequential logic circuits from partial input/output sequences." In Evolvable Systems: From Biology to Hardware, 98–105. Berlin, Heidelberg: Springer Berlin Heidelberg, 1998. http://dx.doi.org/10.1007/bfb0057611.

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Mann, Makai, and Clark Barrett. "Partial Order Reduction for Deep Bug Finding in Synchronous Hardware." In Tools and Algorithms for the Construction and Analysis of Systems, 367–86. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-45190-5_20.

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Verma, Anshul, Mahatim Singh, and Kiran Kumar Pattanaik. "Failure Detectors of Strong S and Perfect P Classes for Time Synchronous Hierarchical Distributed Systems." In Applying Integration Techniques and Methods in Distributed Systems and Technologies, 246–80. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-8295-3.ch010.

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Present failure detection algorithms for distributed systems are designed to work in asynchronous or partially synchronous environments on mesh (all-to-all) connected systems and maintain status of every other process. Several real-time systems are hierarchically connected and require working in strict synchronous environments. Use of existing failure detectors for such systems would generate excess computation and communication overhead. The chapter describes two suspicion-based failure detectors of Strong S and Perfect P classes for hierarchical distributed systems working in time synchronous environments. The algorithm of Strong S class is capable of detecting permanent crash failures, omission failures, link failures, and timing failures. Strong completeness and weak accuracy properties of the algorithm are evaluated. The failure detector of Perfect P class is capable of detecting crash failures, crash-recovery failures, omission failures, link failures, and timing failures. Strong completeness and strong accuracy properties of the failure detector are evaluated.
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Verma, Anshul, Mahatim Singh, and Kiran Kumar Pattanaik. "Failure Detectors of Strong S and Perfect P Classes for Time Synchronous Hierarchical Distributed Systems." In Research Anthology on Architectures, Frameworks, and Integration Strategies for Distributed and Cloud Computing, 1317–43. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-5339-8.ch064.

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Present failure detection algorithms for distributed systems are designed to work in asynchronous or partially synchronous environments on mesh (all-to-all) connected systems and maintain status of every other process. Several real-time systems are hierarchically connected and require working in strict synchronous environments. Use of existing failure detectors for such systems would generate excess computation and communication overhead. The chapter describes two suspicion-based failure detectors of Strong S and Perfect P classes for hierarchical distributed systems working in time synchronous environments. The algorithm of Strong S class is capable of detecting permanent crash failures, omission failures, link failures, and timing failures. Strong completeness and weak accuracy properties of the algorithm are evaluated. The failure detector of Perfect P class is capable of detecting crash failures, crash-recovery failures, omission failures, link failures, and timing failures. Strong completeness and strong accuracy properties of the failure detector are evaluated.
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Conference papers on the topic "Partially synchronous system"

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Zhu, Changsheng, and H. Ulbrich. "Instability of an Over-Hung Rigid Centrifuge Rotor Partially Filled With Fluid." In ASME Turbo Expo 2000: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/2000-gt-0393.

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The objective of this paper is to experimentally investigate the instability of an over-hung rigid centrifuge rotor partially filled with fluid. Specific attention is paid to the developing process of rotor instability, the dynamical behaviour of rotor system while the instability occurs, and the whirling frequency and direction of rotor system within the unstable region. The effects of the fluid fill ratio on the whirling frequency, the unstable region and the rotor imbalance are also studied. The results clarify some issues and show many new phenomena about the instability of the rotor partially filled with fluid for the first time. The phenomena include the sub-synchronous frequency that does not result in the instability of rotor system and which disappears in the unstable region at the large fluid fill ratios; different whirling frequencies existing in the unstable region between the slowly increasing and decreasing rotational speed operations, hysteresis phenomenon in the upper side of the unstable region and the breaking-down phenomenon of the fluid free surface.
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Guo, Zenglin, and Gordon Kirk. "Morton Effect Induced Synchronous Instability in Mid-Span Rotor-Bearing Systems: Part 2—Models and Simulations." In ASME 2010 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/detc2010-28342.

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The mechanism of the Morton Effect induced synchronous instability has been discussed in Part 1, using an assumption of isotropic linear bearings. The second part of the current study will now focus on the more realistic systems, mid-span rotors supported by the hydrodynamic journal bearings. First, the models to calculate the thermal bending of the shaft and the temperature distribution across the journal surface are established. This can be used to calculate the equivalent thermal imbalance. The calculations of the temperature difference and its equivalent thermal imbalance using hydrodynamic plain journal bearing models are conducted and discussed with the comparison to the analytical results obtained in Part 1. It shows that the thermal imbalance induced by the Morton Effect may increase to the level of the mechanical imbalance and then its influence on the system stability should be included. The suggested thermal bending model also partially explain that the mid-span rotors are less liable to be influenced by the Morton Effect induced instability than are the overhung configurations, because of the restraining effect between two supports. Finally, a symmetric mid-span rotor–hydrodynamic journal bearing system is calculated to show its stability performance. The results show the inclusion of the Morton Effect may lead to an unstable operation of the system. Considering the existence of the oil film self-induced vibration due to the dynamic characteristics of fluid film bearings, the Morton Effect may make a further negative impact on the stability of the system. The simulation results of the unbalance response show that the Morton Effect changes the shapes of the whirling orbits and makes them no longer be the standard elliptical orbits around the static equilibriums.
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Valapil, Vidhya Tekken, Sandeep Kulkarni, Eric Torng, and Gabe Appleton. "Efficient Two-Layered Monitor for Partially Synchronous Distributed Systems." In 2020 International Symposium on Reliable Distributed Systems (SRDS). IEEE, 2020. http://dx.doi.org/10.1109/srds51746.2020.00020.

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Wang, Jiaqi, Jennifer Welch, and Hyunyoung Lee. "Time bounds for shared objects in partially synchronous systems." In the 30th annual ACM SIGACT-SIGOPS symposium. New York, New York, USA: ACM Press, 2011. http://dx.doi.org/10.1145/1993806.1993877.

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Atif, M., M. R. Mousavi, and A. Osaiweran. "Formal verification of Unreliable Failure Detectors in Partially Synchronous Systems." In the 27th Annual ACM Symposium. New York, New York, USA: ACM Press, 2012. http://dx.doi.org/10.1145/2245276.2245369.

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Macedo, Raimundo Jose de Araujo, Allan Edgard Silva Freitas, and Alirio Santos de Sa. "A Self-Manageable Group Communication Protocol for Partially Synchronous Distributed Systems." In 2011 5th Latin-American Symposium on Dependable Computing (LADC 2011). IEEE, 2011. http://dx.doi.org/10.1109/ladc.2011.24.

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Vakakis, A. F., and M. E. King. "A Nonlinear Normal Mode Approach for Studying Waves in Nonlinear Monocoupled Periodic Systems." In ASME 1995 Design Engineering Technical Conferences collocated with the ASME 1995 15th International Computers in Engineering Conference and the ASME 1995 9th Annual Engineering Database Symposium. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/detc1995-0324.

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Abstract The free dynamics of a mono-coupled layered nonlinear periodic system of infinite extent is analyzed. It is shown that, in analogy to linear theory, the system possesses nonlinear attenuation and propagation zones (AZs and PZs) in the frequency domain. Responses in AZs correspond to standing waves with spatially attenuating, or expanding envelopes, and are synchronous motions of all points of the periodic system. These motions are analytically examined by employing the notion of “nonlinear normal mode,” thereby reducing the response problem to the solution of an infinite set of singular nonlinear partial differential equations. An asymptotic methodology is developed to solve this set. Numerical computations are carried out to complement the analytical findings. The methodology developed in this work can be extended to investigate synchronous attenuating motions of multi-coupled nonlinear periodic systems.
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Rakhit, A. K., G. A. Cornejo, and G. J. Lack. "Characteristics of Low Frequency Non-Synchronous Vibrations Induced by an Epicyclic Gearbox in Gas Turbogenerator Applications." In ASME 1998 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/98-gt-333.

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Epicyclic gearboxes of star configuration running at partial loads were found to induce non-synchronous (not related to speed) low-frequency vibrations, besides low level sub-synchronous (speed related) which were transmitted to other parts of a turbogenerator power train. At certain loads, the amplitudes of the non-synchronous vibrations were high enough to cause potential damage to sleeve bearings used in the power train system if a generator set would run for any considerable length of time at these loads. It was also observed that a very small increase in load above a certain limit (about 18% of full load) resulted in almost total elimination of these vibrations. Analysis of test data showed the non-synchronous vibrations were due to ‘backward whirl’ motion of gearbox output shaft in its sleeve bearings. Higher damping in the bearings was considered to be one of the most effective methods to suppress backward whirl of a shaft and hence, the non-synchronous vibrations. Accordingly, a new set of gearbox output shaft sleeve bearings was designed for higher damping that would allow these types of generator sets to run at partial and full loads without any detrimental vibration.
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Honorat, Alexandre, Karol Desnos, Shuvra S. Bhattacharyya, and Jean-François Nezan. "Scheduling of Synchronous Dataflow Graphs with Partially Periodic Real-Time Constraints." In RTNS 2020: 28th International Conference on Real-Time Networks and Systems. New York, NY, USA: ACM, 2020. http://dx.doi.org/10.1145/3394810.3394820.

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Long, XiaoLin, and JingPing Jiang. "Information Consensus in Partial Synchronous Network of Multi-robot Systems." In 2008 International Conference on Computational Intelligence for Modelling Control & Automation. IEEE, 2008. http://dx.doi.org/10.1109/cimca.2008.117.

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