The transverse runout of a rotating flexible disc under stationary sliders

2009 ◽  
Vol 223 (6) ◽  
pp. 1319-1326 ◽  
Author(s):  
Yong-Chen Pei ◽  
Ling He ◽  
Feng-Jiang He
Keyword(s):  
Steady State ◽  
Natural Frequency ◽  
Friction Force ◽  
Governing Equation ◽  
Steady State Response ◽  
System Parameters ◽  
State Response ◽  
Steady State Amplitude

The governing equation of a rotating flexible disc under stationary sliders is modelled under consideration of the initial transverse runout of the disc. Natural frequency and stability of the system is studied and checked, and steady-state response is obtained. The effects of system parameters on the steady-state amplitude of the sliders are analysed and resonance induced by the sliders is discovered. The decrease of the number of nodal diameters of the initial transverse runout and slider mass, and the increase of disc damping, slider damping, and natural frequency and friction force at the disc—slider interface, can be used to suppress the amplitude.

Dynamic Analysis of Optical Brittle Crystal Slicing by Using Wiresaw

2010 ◽  
Vol 97-101 ◽  
pp. 45-48
Author(s):  
Yan Bo Feng ◽  
Tao Sun
Keyword(s):  
Finite Element Method ◽  
Steady State ◽  
High Efficiency ◽  
Dynamic Effect ◽  
Suitable Model ◽  
Steady State Response ◽  
Large Ingot ◽  
System Parameters ◽  
State Response ◽  
Brittle Crystals

In recent years, wire sawing is considered to be a potentially better technology of slicing brittle crystals especially semiconductor, owing to the unmatched advantages of slicing large ingot into thin wafers with high efficiency, fine quality and less kerf loss. This paper analyses the dynamic effect on wire from a variety of excitation and mechanical structure in the process of cutting on the basis of the effects of vibration on slicing wafer quality. A suitable model is built according to Hamilton principle, closed form expressions is present for the steady state response using finite element method. The relation between inherent characteristics of wiresaw and different system parameters is obtained.

Resonance and the Aging Spring

2002 ◽  
Vol 69 (3) ◽  
pp. 397-398 ◽  
Author(s):  
T. J. Lardner
Keyword(s):  
Steady State ◽  
Natural Frequency ◽  
Steady State Response ◽  
Spring Stiffness ◽  
Initial Stiffness ◽  
Decay Constants ◽  
State Response ◽  
Forcing Function ◽  
Mass Spring

The steady-state response of the classic mass-spring-dashpot model when the spring stiffness decays exponentially with time (an aging spring) and the system is excited by a forcing function whose frequency is equal to the natural frequency of the system with the constant initial stiffness is investigated. The steady-state response is obtained in terms of the dumping and decay constants of the system and exhibits an oscillation about a nonzero value.

Nonlinear Resonant Vibration of Counter-Shaft Gears With Fluctuating Mesh Stiffness

2009 ◽  
Author(s):  
Robert G. Parker
Keyword(s):  
Steady State ◽  
Perturbation Analysis ◽  
Numerical Solutions ◽  
Design Guidelines ◽  
Resonant Vibration ◽  
Steady State Response ◽  
Mesh Stiffness ◽  
Closed Form Solutions ◽  
System Parameters ◽  
State Response

This work studies the nonlinear, parametrically excited dynamics of counter-shaft gear systems. The dynamic model includes parametric excitations and tooth contact loss. The steady state response is found using perturbation analysis and compared against numerical solutions. The mesh interactions depend strongly on the relation of the two mesh periods. The closed-form solutions provide design guidelines in terms of the system parameters.

The Auditory Steady-State Response: Full-Term and Premature Neonates

2002 ◽  
Vol 13 (05) ◽  
pp. 260-269 ◽  
Author(s):  
Barbara Cone-Wesson ◽  
John Parker ◽  
Nina Swiderski ◽  
Field Rickards
Keyword(s):  
Steady State ◽  
Premature Infants ◽  
Modulation Frequency ◽  
Otoacoustic Emission ◽  
Full Term ◽  
Steady State Response ◽  
Pass Rates ◽  
Term Infants ◽  
State Response ◽  
Auditory Steady State Response

Two studies were aimed at developing the auditory steady-state response (ASSR) for universal newborn hearing screening. First, neonates who had passed auditory brainstem response, transient evoked otoacoustic emission, and distortion-product otoacoustic emission tests were also tested with ASSRs using modulated tones that varied in frequency and level. Pass rates were highest (> 90%) for amplitude-modulated tones presented at levels ≥ 69 dB SPL. The effect of modulation frequency on ASSR for 500- and 2000-Hz tones was evaluated in full-term and premature infants in the second study. Full-term infants had higher pass rates for 2000-Hz tones amplitude modulated at 74 to 106 Hz compared with pass rates for a 500-Hz tone modulated at 58 to 90 Hz. Premature infants had lower pass rates than full-term infants for both carrier frequencies. Systematic investigation of ASSR threshold and the effect of modulation frequency in neonates is needed to adapt the technique for screening.

Sign in / Sign up

Export Citation Format

Share Document