Design optimization and fatigue testing of an electronically-driven mechanically-resonant cantilever spring mechanism

Kheng, Lim Boon; Kean, Koay Loke; Gitano-Briggs, Horizon

doi:10.1016/j.matdes.2010.03.023

Cited by 8 publications

(4 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The CFF depends on the ambient illumination level and the brightness of the illuminated objects. When viewing objects under bright ambient conditions the CFF may be as high as 100 Hz 26 . In the dark, however, the CFF is typically around 40 Hz.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

An Approach for Nonlinear Damping Characterization for Linear Optical Scanner

2012

Self Cite

View full text Add to dashboard Cite

Vibratory systems that are used in linear optical scanners are significantly influenced by the properties of the surrounding fluid. Although, the dominant energy loss in scanner vibrations is caused by viscous effects, especially in nonmicroelectromechanical system (MEMS) scanners, the relative importance of viscous damping model is not well studied. In this study, a piece-wise method for calculating the damping ratio with logarithmic decrement to produce a numerical model which is able to predict the free response of a linear optical scanner is developed. The damping ratio function used in the model was derived by comparing and minimizing the deviation between the amplitude predicted by numerical model and the experimental data. The efficiency of this approach was tested on the basis of a torsional spring scanner. The results show significant improvement whereby the proposed model predicted the free response with a deviation of only 8% while the general exponential damping model produced a deviation of 20%.

show abstract

Section: Methodsmentioning

confidence: 99%

“…When viewing objects under bright ambient conditions the CFF may be as high as 100 Hz. 26 In the dark, however, the CFF is typically around 40 Hz. In this study, the scanner's resonant frequency is tuned to 40 Hz since the application's environment light intensity is low.…”

Section: Linear Optical Scanner Designmentioning

confidence: 99%

An Approach for Nonlinear Damping Characterization for Linear Optical Scanner

2012

Self Cite

View full text Add to dashboard Cite

show abstract

“…In low-light conditions, the CFF is typically around 40 Hz. 19 In this study, the resonance frequency of the scanner was set to 40 Hz as the environment light intensity is low. To set the resonance frequency of the torsional spring, a geometry study of the spring was performed in previous study.…”

Section: Linear Optical Scanner Designmentioning

confidence: 99%

An Investigation on the Damping Characteristics of a Linear Optical Scanner

2013

View full text Add to dashboard Cite

A mechanically resonant torsional spring scanner was previously designed for light dispersion application. However, the effects of mountings and pressure variation on the damping characteristic of the scanner were not well studied. In this study, the damping characteristics of the linear optical scanner with torsional spring mechanism are investigated with a mathematical model and various experiments. To examine the scanner's free response profile when the resonance frequency and damping ratio were varied, a damping model was established based on experimental results. Several experiments were performed to investigate the damping characteristics when environmental pressure and scanner mounting are changed. The scanner mountings consist of rigid mounting, spring demounting, and the use of various dampers. In general, the scanner damping was shown to be greater at higher atmospheric pressures when the scanner was mounted on a foam damper.

show abstract

“…French et al [21] performed durability testing of notched beams by exciting the specimens in three directions with sine sweeps in the area of the specimens' resonance. Furthermore, the excitation for a accelerated vibrational fatigue test can be performed by means of the electromagnetic forces in an alternating magnetic field, as demonstrated by Kheng [22] in a fatigue test of a cantilever spring mechanism.…”

Section: Introductionmentioning

confidence: 99%