Online Identification and Verification of the Elastic Coupling Torsional Stiffness

Li, Wanyou; Chai, Zhuoye; Wang, Mengqi; Hu, Xinhuan; Guo, Yibin

doi:10.1155/2016/2016432

Cited by 3 publications

(2 citation statements)

References 6 publications

(6 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In other words, for complicated equipment (e.g., an engine), once the type has been decided upon in the design stage of a shaft system, it would be very difficult or unrealistic to modify any inertia or stiffness of it. Thus, in this paper, the chosen specific strategy is to modify the coupling, which contains two moments of inertia and torsional stiffness between them [30].…”

Section: Resultsmentioning

confidence: 99%

Structural Modifications for Torsional Vibration Control of Shafting Systems Based on Torsional Receptances

Liu

Ouyang

2016

Shock and Vibration

Self Cite

View full text Add to dashboard Cite

Torsional vibration of shafts is a very important problem in engineering, in particular in ship engines and aeroengines. Due to their high levels of integration and complexity, it is hard to get their accurate structural data or accurate modal data. This lack of data is unhelpful to vibration control in the form of structural modifications. Besides, many parts in shaft systems are not allowed to be modified such as rotary inertia of a pump or an engine, which is designed for achieving certain functions. This paper presents a strategy for torsional vibration control of shaft systems in the form of structural modifications based on receptances, which does not need analytical or modal models of the systems under investigation. It only needs the torsional receptances of the system, which can be obtained by testing simple auxiliary structure attached to relevant locations of the shaft system and using the finite element model (FEM) of the simple structure. An optimization problem is constructed to determine the required structural modifications, based on the actual requirements of modal frequencies and mode shapes. A numerical experiment is set up and the influence of several system parameters is analysed. Several scenarios of constraints in practice are considered. The numerical simulation results demonstrate the effectiveness of this method and its feasibility in solving torsional vibration problems in practice.

show abstract

Section: Resultsmentioning

confidence: 99%

Structural Modifications for Torsional Vibration Control of Shafting Systems Based on Torsional Receptances

Liu

Ouyang

2016

Shock and Vibration

Self Cite

View full text Add to dashboard Cite

show abstract

“…From a theoretical point of view, the optimum mechanical properties of the flexible coupling to the dedicated drive system should not only be based on the transmitted torque (as in most cases) but also mainly, based on the viscoelastic properties of the flexible connector present in the flexible coupling. These properties are identified based on static or dynamic characteristics recorded under experimental conditions [1][2][3][4][5]. Limited access to this type of research results in the fact that the designers during the design of the couplings do not take these parameters into account when fitting the coupling to the drive system.…”

Section: Introductionmentioning

confidence: 99%

Study of flexible couplings non-linear dynamics using bond graphs

Margielewicz

Opasiak

Gąska

et al. 2019

Forsch Ingenieurwes

View full text Add to dashboard Cite

The aim of this work is to model the dynamics of flexible couplings. On the basis of a non-linear mathematical model solved by bond graph, the ranges of excitation frequency were determined, in which the movement of the couplings is chaotic. For three couplings, the 3D distributions of the largest Lyapunov exponent and correlation dimension diagram (CDD) were plotted. The proposed diagram (CDD) illustrates how the geometric structure of the attractor changes when the conditions of excitation change. The classic Poincare cross-section, completed by us with the density of points distribution, significantly enhances information about geometrical structures of strange attractors. It has been shown that in relation to large ranges of changes in the control parameter, the geometric structure of the strange attractor is stretched and curved. The areas with the highest densification of the Poincaré cross section are most often located in places where the chaotic attractor is curved. Untersuchung der nichtlinearen Dynamik flexibler Kopplungen mit Hilfe von Bondgraphen ZusammenfassungZiel dieser Arbeit ist es, die Dynamik von elastischen Kupplungen zu modellieren. Anhand eines durch einen Bindungsgraphen gelösten nichtlinearen mathematischen Modells wurden die Bereiche der Anregungsfrequenz bestimmt, in denen die Bewegung der Kopplungen chaotisch ist. Für drei Kopplungen wurden die 3D-Verteilungen des größten Lyapunov-Exponenten und das Korrelationsdimensionsdiagramm (CDD) aufgezeichnet. Das vorgeschlagene Diagramm (CDD) zeigt, wie sich die geometrische Struktur des Attraktors ändert, wenn sich die Anregungsbedingungen ändern. Der von uns vervollständigte klassische Poincaré-Querschnitt mit der Dichte der Punkteverteilung verbessert die Informationen über geometrische Strukturen fremder Attraktoren erheblich. Es hat sich gezeigt, dass in Bezug auf große Änderungsbereiche der Steuerparameter die geometrische Struktur des seltsamen Attraktors gedehnt und gebogen wird. Die Bereiche mit der höchsten Verdichtung des Poincaré-Querschnitts befinden sich am häufigsten an Stellen, an denen der chaotische Attraktor gekrümmt ist.

show abstract