On a component mode synthesis on multi-level and its application to dynamics analysis of vehicle system supported with spring-stiffness damper system

Modal synthesis method is a method which can reduce structural degrees of freedom, it is applicable for analysis and calculations of Machining centers and other large-scale structure. In this paper, the dynamical performance of Five-axis boring and milling processing center was studied with component mode synthesis technology . Compared with full model FEM, component mode synthesis technology could meet the accuracy requirements and have higher computational efficiency. Modal characteristics of processing center in different positions was studied, the result showed that each frequency of processing center in different position was different while the vibration mode remained unchanged.

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Dynamics analysis of a single cylinder hermetic reciprocating compressor

The Academic Society Journal ◽

10.32640/tasj.2018.3.139 ◽

2018 ◽

pp. 139-155

Author(s):

SC Rangel ◽

HA Navarro ◽

Luben Cabezas-Gómes

Keyword(s):

Stiffness Matrix ◽

Characteristic Frequency ◽

Displacement Vector ◽

Dynamic Modelling ◽

Time History ◽

Dynamics Analysis ◽

Reciprocating Compressor ◽

Spring Stiffness ◽

Resonance Frequencies ◽

Hermetic Compressor

This paper describes a dynamic modelling of a hermetic compressor pump. The pump suspension system stiffness matrix is calculated with the suspension springs, taking into account the compressive, flexural and shearing rigidities of the springs. The model allows computing the dynamic, normalized modal, and characteristic frequency matrices, and also the displacement vector of the pump and the overall kinetic and elastic potential energies of the system due to shaking forces. The results include the dynamic behavior of a compressor pump showing time history displacements, rotations and resonance frequencies for a baseline configuration. It is also show the influence of the spring stiffness and positions, through parametric and optimization analyses.

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Component Mode Synthesis of a Vehicle System Model Using the Fictitious Mass Method

44th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference ◽

10.2514/6.2003-1606 ◽

2003 ◽

Cited By ~ 1

Author(s):

Moti Karpel ◽

Boris Moulin ◽

Vladimir Feldgun

Keyword(s):

Component Mode Synthesis ◽

System Model ◽

Vehicle System

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Vibration analysis of a vehicle system supported on a damper-controlled variable-spring-stiffness suspension

Proceedings of the Institution of Mechanical Engineers Part D Journal of Automobile Engineering ◽

10.1243/095440705x11185 ◽

2005 ◽

Vol 219 (5) ◽

pp. 607-619 ◽

Cited By ~ 5

Author(s):

M K Ghosh ◽

R Dinavahi

Keyword(s):

Active Control ◽

Vibration Isolation ◽

Damping Ratio ◽

Spring Stiffness ◽

Mass Ratio ◽

Car Model ◽

Vehicle System ◽

Force Generator ◽

Vibration Isolation Performance ◽

Isolation Performance

Vibration isolation performance has been investigated for a vehicle system supported on a damper-controlled variable-spring-stiffness suspension system. A half-car model has been analysed for different values of damping ratio, relative damping ratio, and mass ratio. The semi-active control of a half-car model has been investigated with the help of a force generator as well as with optimal control theory. The results show that a damper-controlled variable-stiffness suspension improves the vibration isolation performance of the suspension system. It has been found that a lower damping ratio, a relative damping ratio of unity, and a higher mass ratio gives optimum reduction in the transmissibility of motion from road surface to the vehicle body. The semi-active control of a half-car model supported on a damper-controlled variable-springstffiness suspension can be achieved using a force generator or an actuator. The use of a force generator can minimize the power required to control the damper. A full-state feedback and linear quadratic regulator control theory gives better results for higher mass ratios.

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Automotive structure vibration with component mode synthesis on a multi-level

International Journal of Automotive Technology ◽

10.1007/s12239-008-0015-8 ◽

2008 ◽

Vol 9 (1) ◽

pp. 119-122 ◽

Cited By ~ 5

Author(s):

C. -W. Kim ◽

S. N. Jung ◽

J. H. Choi

Keyword(s):

Component Mode Synthesis ◽

Structure Vibration ◽

Multi Level

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Propeller Whirl Flutter Study using Multibody Dynamics Analysis with Component Mode Synthesis Element

10.2514/6.2022-1125 ◽

2022 ◽

Author(s):

Kyle J. Nelson ◽

Jinwei Shen

Keyword(s):

Multibody Dynamics ◽

Component Mode Synthesis ◽

Dynamics Analysis ◽

Whirl Flutter

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Multi-level Issues in Organizational Behavior and Processes

10.1016/s1475-9144(2005)3 ◽

2005 ◽

Keyword(s):

Organizational Behavior ◽

Multi Level

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Verlaufsanalyse wöchentlicher Selbst- und Fremdeinschätzungen in der Langzeittherapie suchtkranker Jugendlicher

Zeitschrift für Kinder- und Jugendpsychiatrie und Psychotherapie ◽

10.1024/1422-4917/a000594 ◽

2019 ◽

Vol 47 (2) ◽

pp. 126-137

Author(s):

Ferdinand Keller ◽

Tatjana Stadnitski ◽

Jakob Nützel ◽

Renate Schepker

Keyword(s):

Allen Vier ◽

Multi Level

Zusammenfassung. Fragestellung: Über Veränderungen in der emotionalen Befindlichkeit von Jugendlichen während einer Suchttherapie ist wenig bekannt. Methode: Die Jugendlichen füllten wöchentlich einen entsprechenden Fragebogen aus, analog ihre Bezugsbetreuer eine parallelisierte Kurzfassung. Von 42 Jugendlichen liegen insgesamt 853 Bogen und von den Bezugsbetreuern 708 Bogen vor. Die Fragebogen wurden zunächst faktorenanalytisch hinsichtlich ihrer Dimensionalität ausgewertet, anschließend wurden gruppenbezogene Verlaufsanalysen (Multi-Level-Modelle) und Abhängigkeitsanalysen auf Einzelfallebene (Zeitreihenanalysen) durchgeführt. Ergebnisse: Im Jugendlichenfragebogen ergaben sich vier Faktoren: negative Befindlichkeit, Wertschätzung von Therapie/Betreuung, Motivation und Suchtdynamik. Die Übereinstimmung zwischen den Jugendlichen- und der (einfaktoriellen) Betreuereinschätzung fiel insgesamt niedrig bis mäßig aus, brachte aber auf Einzelfallebene differenziertere Ergebnisse. Im Verlauf nahmen die Werte auf allen vier Jugendlichenskalen ab. Einzig der Verlauf der Wertschätzung in der Eingewöhnungsphase war prädiktiv für den späteren Abbruch der Maßnahme: Bei den Abbrechern nahm die Wertschätzung ab, während sie bei den Beendern initial stieg. Schlussfolgerungen: Der bedeutsamste Faktor in Bezug auf die Therapiebeendigung suchtkranker Jugendlicher scheint die Wertschätzung von Therapie/Betreuung zu sein, während die Motivation jugendtypische Schwankungen aufweist. Der Suchtdynamik kam eine deutlich weniger bedeutende Rolle zu als allgemein angenommen. Programme in der Langzeittherapie sollten die Wertschätzung von Therapie/Betreuung künftig mehr fokussieren als die Suchtdynamik.

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