Dry Friction Effect on the Work of Viscous Torsion Damper

2016 ◽  
Vol 817 ◽  
pp. 13-18
Author(s):  
Celina Jagiełowicz-Ryznar
Keyword(s):  
Friction Coefficient ◽  
Free Vibration ◽  
Friction Force ◽  
Vibration Frequency ◽  
Forced Vibration ◽  
Dry Friction ◽  
Viscous Damper ◽  
The Real ◽  
Free Vibration Frequency ◽  
Marine Engines

The results of crankshaft forced vibration calculations, including the dry friction force which can be formed in the viscous damper bearing sliding, were presented. This problem concerns the big dampers used in the marine engines. The friction force influence is presented using the function {sign}. Low values of friction coefficient, corresponding to the conditions similar to the real ones, were assumed. In the range of tested value, it was found that the vibration increases linearly, and system free vibration frequency doesn’t change practically.

Tribology research of the turned zirconium-dioxide ceramics

2012 ◽  
Vol 3 (3) ◽  
pp. 181-190
Author(s):  
G. Fledrich ◽  
R. Keresztes ◽  
L. Zsidai
Keyword(s):  
Friction Coefficient ◽  
Friction Force ◽  
Dry Friction ◽  
Zirconium Dioxide ◽  
Steel Specimen ◽  
Friction Condition ◽  
Normal Direction ◽  
Basic Material ◽  
Series Production ◽  
Ceramic Specimen

The zirconium dioxide as basic material is suitable to machine by tool with regular edge derivingfrom lower ceramic hardness and from other characteristics so in case of piece production or small – andmedium series production, at quick prototype production can become potential material alike. The aims tocompare the arising frictional characteristics in case of dry friction condition in case of ceramic – steelsurface pairs machined with different sets. We have developed for an equipment to carry out tribologicaltests. During the test we pressure the steel counter face with determined normal direction force thecasing surface of the rotating ceramic specimen and in the meantime we measure the value of the frictionforce with force meter cell. We have calculated the friction coefficient characterizing the system from thenormal direction force and the friction force as well as we measured the wear of the steel specimen andits deformation.

Isospectral Euler-Bernoulli beams with continuous density and rigidity functions

1987 ◽  
Vol 413 (1844) ◽  
pp. 235-250 ◽  
Keyword(s):  
Boundary Condition ◽  
Free Vibration ◽  
Exact Solutions ◽  
Vibration Frequency ◽  
Flexural Rigidity ◽  
Homogeneous Case ◽  
Continuous Density ◽  
Free Vibration Frequency ◽  
End Conditions ◽  
Vibration Frequency Spectrum

Isospectral systems are those that have exactly the same free-vibration frequency spectrum with respect to a given boundary condition configuration. In this paper, seven different classes of inhomogeneous Euler-Bernoulli beams with continuous density and flexural rigidity functions are found that are analytically solvable and that are isospectral with a homogeneous beam in the clamped-clamped configuration. Of these exact solutions, one class is isospectral with the homogeneous case in all ten distinct configurations obtainable from clamped, sliding and two antiresonant end conditions, whereas another class is isospectral in the six configurations with clamped, hinged or free end conditions. A connection with inverse problems is discussed.

New Method for Measurement of Contact Angle (Droplet Free Vibration Frequency Method)

1999 ◽  
Vol 38 (Part 1, No. 5B) ◽  
pp. 3127-3130 ◽  
Author(s):  
Shigeyuki Yamakita ◽  
Yoshikazu Matsui ◽  
Showko Shiokawa
Keyword(s):  
Contact Angle ◽  
Free Vibration ◽  
Vibration Frequency ◽  
New Method ◽  
Frequency Method ◽  
Free Vibration Frequency

Properties of axial or torsional free-vibration frequency of rods

AIAA Journal ◽  
1975 ◽  
Vol 13 (8) ◽  
pp. 1111-1112 ◽  
Author(s):  
Solly Andy Segenreich ◽  
Paulo Rizzi
Keyword(s):  
Free Vibration ◽  
Vibration Frequency ◽  
Free Vibration Frequency

Robotic Assembly Using Vibrations

2006 ◽  
Vol 113 ◽  
pp. 301-306
Author(s):  
Bronius Bakšys ◽  
Nomeda Puodziuniene
Keyword(s):  
Friction Coefficient ◽  
Dynamic Model ◽  
Friction Force ◽  
Equilibrium Position ◽  
Dry Friction ◽  
Dynamic Equilibrium ◽  
The Body ◽  
Robotic Assembly ◽  
Time Interval ◽  
Passive Compliance

On the basis of the dynamic model of vibratory alignment the main features of the vibrational assembly process are investigated. The regularities of non−impact alignment, when an immovable part is excited in two perpendicular directions, are defined. It is revealed that during the vibrational alignment the movable part can move from static till dynamic equilibrium position. The distance between these two positions defines allowable error of mutual positioning of the parts subject to the assembly, when the unhindered parts insertion is still possible. On the basis of the dynamic model of vibratory displacement the regularities of a body displacement under controlled dry friction force at a particular time interval is examined. If elastic vibrations are excited, dry friction coefficient decreases and smaller friction force acts against the body displacement. Stoppage of these vibrations causes a steep increase of friction coefficient. When the body moves from static to dynamic equilibrium position on the inclined plane the vibratory displacement is governed by the transient regimes of motion. Assembly robots equipped with passive compliance vibratory end-effectors allow one to compensate considerably bigger deviations in part’s interposition without using sensors and feedback systems. Therefore usage of vibratory devices with passive compliance allows one to significantly reduce the expenses of robotic assembly.

Mechanical Characteristics Analysis of Sensitive Parameters of Long-Span Steel Truss Suspension Bridge

2011 ◽  
Vol 250-253 ◽  
pp. 3381-3386 ◽  
Author(s):  
Da Wang ◽  
Yi Zhou Zhu
Keyword(s):  
Free Vibration ◽  
Vibration Frequency ◽  
Mechanical Characteristics ◽  
Suspension Bridge ◽  
Vibration Characteristics ◽  
Structure Parameters ◽  
Long Span ◽  
Main Cable ◽  
Free Vibration Frequency ◽  
Central Buckle

In order to study the influences of structure parameters on the structure mechanical characteristics of long-span suspension bridge. The Shiduhe bridge in Hubei Province was taken as the background of this study, The influence on structure line shape and free vibration characteristics of suspension bridge with the change of structure parameters was studied. The results show that main cable stiffness not only has greater effect on the structure shape of long-span suspension bridge, it also has obvious impact on structure free vibration frequency, in addition, the torsion displacement of stiffening girder can be reduced effectively by adding central buckle, it improves structure bending and torsion stiffness significantly, central buckle also can improve free vibration frequency of structure and enhance structure dynamic stability, It shows that the influencing factors of structure static characteristics are restricted by rigidity of main cable, free vibration characteristics are affected by main cable and central buckle, they are not very sensitive to the variations of the parameters of suspender cable, stiffening girder and main tower.

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