... due to diverse factors, such as the smearing of surface irregularities, elevated transmission fluid temperatures, fluctuating axial pressure, or aggressive shifting. Consequently, the slope of the friction curves tends to assume a negative gradient, giving rise to adverse damping effects like self...

...) by employing sector-level calculations. This results in substantial reductions in computational efforts while maintaining accurate predictions of forced responses. Graphical Abstract Figure split ring damper frictional energy dissipation blade mistuning blade detuning damping dynamics...

... vessels and result in strong vibrations of measuring instruments. Placing a porous material inside a tube with a goal to increase acoustic damping or attaching a small resonator to the main tube are some of the possible ways to suppress or mitigate Taconis effects. However, when the porous inserts...

...Jamal Ardister; Fatemeh Afzali; Brian F. Feeny We study the primary resonance of a parametrically damped Mathieu equation with direct excitation. Potential applications include wind-turbine blade vibration with cyclic stiffening and aeroelastic effects, which may induce parametric damping...

... of the magnitude curve by means of an FS model is possible. The phase curve by Håkansson et al., however, is substantially different from the previous ones in the mass-governed high-frequency range where the phase angle never exceeds 40 deg, indicating very high damping values. It is not clear if this behavior...

... and A coustics . 15 06 2023 23 09 2023 24 09 2023 13 10 2023 damping modal analysis stability Combustion systems can exhibit undesired behavior in the form of oscillating pressure and heat release rates. The noisy combustion seen initially morphs into a discrete toned...

...John W. Sanders; Daniel J. Inman Many oscillatory systems of engineering and scientific interest ( e.g. , mechanical metastructures) exhibit nonproportional damping, wherein the mass-normalized damping and stiffness matrices do not commute. A new modal analysis technique for nonproportionally...

...J. Gregory McDaniel; Alyssa Liem; Allison Kaminski Over the past century, a number of scalar metrics have been proposed to measure the damping of a complex system. The present work explores these metrics in the context of finite element models. Perhaps the most common is the system loss factor...

...K. P. McNamara; J. S. Love; M. J. Tait The nonlinear response of a series-type pendulum tuned mass damper-tuned liquid damper (TMD-TLD) system is investigated in this study. The TLD is mounted on the pendulum TMD in series to remove the need for costly viscous damping elements. Since the response...

... that this is due to a considerable increase of damping, caused by the sensor cables, affecting mainly the higher-frequency modes. damping dynamics non-linear vibration Laser Doppler vibrometers direct a laser beam on the point of interest. The laser beam is reflected from the moving surface...

... ( 1 ), p. 011304 . 10.1115/1.4034370 [12] Cotterill , P. A. , Nigro , D. , Abrahams , I. D. , Garcia-Neefjes , E. , and Parnell , W. J. , 2018 , “ Thermo-Viscous Damping of Acoustic Waves in Narrow Channels: A Comparison of Effects in Air and Water ,” J. Acoust. Soc. Am...

... system by a set of spring and damping elements. A complex coordinate notation was helpful to make a concise physical description of the in-phase and out-of-phase wobbling motions between the bodies. If its properties are properly adjusted, all modes interact (indicating veering or crossings between...

...., Ltd. for useful discussions. There are no conflicts of interest. Email: yuki_koike@jp.honda Email: shingo_tsuruoka@jp.honda damping dynamics machine dynamics modal analysis structural dynamics and control vibration control Brush cutters are handheld machines...

...Hangyuan Lv; Michael J. Leamy This paper explores the addition of small stubs with anechoic terminations (termed herein “anechoic stubs”) as a means of damping and/or removing vibration modes from planar frame structures. Due to the difficulties associated with representing anechoic boundary...

... identification process of two moving loads. The effects from moving loads’ traveling direction, measurement location arrangements, number of participant measurements, and damping ratios are considered in the studies under noisy disturbance conditions. Results show that the stiffness of the translational...

... substitution method using alcohol and the average value of ten measurements is used. The value for the general rubber–rubber friction coefficient of 0.5 [ 22 ] was adopted as the friction coefficient. The damping coefficient is a value adjusted so that the bounce height of a single particle is the same between...

... the response characteristics of a linear oscillator for which the damping coefficient varies periodically in time. The Floquet theory is used to determine the effects of mean plus cyclic damping on the Floquet multipliers. An approximate Floquet solution, which includes an exponential part and a periodic part...

... that, by increasing the sublayer number, the present solution approaches the exact one. After validating the formulation and program, we investigate the acoustic vibration characteristics in nanoparticles. These include the effects of material anisotropy, damping, and core–shell imperfect interface on the vibration...

...Lukas Woiwode; Johann Gross; Malte Krack It is well-known that nonlinear dry friction damping has the potential to bound the otherwise unboundedly growing vibrations of self-excited structures. An important technical example are the flutter-induced friction-damped limit cycle oscillations...

... overlooked their damping effects through careful analytical model developments. The objective of the current work is to present analytical models for cable-harnessed structures that also include the damping effects in their vibration response. Obtaining simple, low-order and high-fidelity models are highly...