Frequency Response of the Sample Vibration Mode in Scanning Probe Acoustic Microscope

2010 ◽  
Vol 27 (5) ◽  
pp. 056201 ◽  
Author(s):  
Zhao Ya-Jun ◽  
Cheng Qian ◽  
Qian Meng-Lu
Keyword(s):  
Frequency Response ◽  
Vibration Mode ◽  
Scanning Probe ◽  
Acoustic Microscope

The Detection of Different Physical Properties of Laser-Damaged HfO2 Film on SiO2 Substrate by Scanning Probe Acoustic Microscope

2011 ◽  
Vol 194-196 ◽  
pp. 2448-2451 ◽  
Author(s):  
Wen Gang Yao ◽  
Qian Cheng
Keyword(s):  
Water Vapor ◽  
Physical Properties ◽  
Vibration Mode ◽  
Substrate Surface ◽  
Scanning Probe ◽  
Acoustic Microscope ◽  
Acoustic Images ◽  
Surface Topographies ◽  
Phase Images

Different physical properties of laser-damaged HfO2film on SiO2substrate were detected by scanning probe acoustic microscope. Surface topographies of SPM showed that the depth of laser-damaged hole on the HfO2film was close to the thickness of film, while the phase images in probe-vibration mode of SPAM showed that the hydrophilicity of damaged area of HfO2film was higher than undamaged area which led to stronger absorption to water vapor in air. Some scratches on SiO2substrate surface under HfO2film was found in the acoustic images in sample-vibration mode of SPAM.

Large Deflection 3DOF Piezoelectric Microrobotic Manipulator With Positional Sensing and Self-Calibration

2012 ◽  
Author(s):  
Xing Jin ◽  
Jason V. Clark
Keyword(s):  
Dynamic Response ◽  
Frequency Response ◽  
Range Of Motion ◽  
Data Storage ◽  
Scanning Probe Microscopy ◽  
Large Deflection ◽  
Scanning Probe ◽  
Large Deflections ◽  
Self Calibration ◽  
Aqueous Environments

In this paper, we propose a large deflection piezoelectric microrobotic manipulator with the ability to self-calibrate displacement and sense its position. Such a manipulator should be applicable to scanning probe microscopy, nanolithography, data storage, biological probing in murky aqueous environments, and the like. Previous devices for such applications are limited in dexterity, range of motion, frequency response, positional calibration, or require environmental cleanliness. Our device has a three novel attributes, which are: an ability to achieve large deflections with greater than one degree of freedom (DOF); an ability to self-calibrate it displacement; and an ability to sense its position after actuation or prescribed displacement. Through simulation we demonstrate independent 3 DOF motional control (validated experimentally), positional sensing and self-calibration, and dynamic response.

scholarly journals Arrangement Method of Vibration Dampers Considering Frequency Response Physical Characteristics and Stiffness of Conductor

2021 ◽  
Vol 2083 (2) ◽  
pp. 022057
Author(s):  
Yongchun Weng ◽  
Zhao Zhang ◽  
Xiaolai Li ◽  
Shiqiang Yang ◽  
Shengchun Liu ◽  
...  
Keyword(s):  
Frequency Response ◽  
Vibration Mode ◽  
New Method ◽  
Good Effect ◽  
Response Characteristics ◽  
Aeolian Vibration ◽  
Calculation Results ◽  
Frequency Response Characteristics ◽  
Vibration Performance ◽  
Vibration Dampers

Abstract In order to study the calculation method of installation distance of vibration dampers with higher precision, so as to maximize its anti-vibration performance on the conductor. The arrangement method of dampers based on the frequency response characteristics of conductors is proposed, the dynamic model of conductor considering stiffness is established. The model is solved by finite difference method, the natural frequency and vibration mode of conductor in case of Aeolian vibration are obtained, and the wavelength of conductor vibration is obtained according to its mode, so as to calculate the installation distance of vibration dampers. The calculation results of the new method are compared with those of the traditional method, which proves the advantage of the new method in calculation accuracy. The new method has a good effect on improving the calculation accuracy of the installation distance of the vibration dampers on the conductors, which is greatly influenced by its stiffness. At the same time, the frequency response of the conductor should be considered as much as possible in the calculation of the installation distance of the damper.

Observations of liver cancer cells in scanning probe acoustic microscope: a preliminary study

2016 ◽  
Author(s):  
Xiaohui Chen ◽  
Xiaoyue Fang ◽  
Qing Xi ◽  
Hua Guo ◽  
Ning Zhang ◽  
...  
Keyword(s):  
Liver Cancer ◽  
Cancer Cells ◽  
Scanning Probe ◽  
Acoustic Microscope ◽  
Liver Cancer Cells ◽  
Preliminary Study

scholarly journals STUDYING THE DYNAMIC CHARACTERISTICS TO LENGTHEN THE OPERATING LIFE FOR A DIESEL ENGINE USING FREQUENCY RESPONSE FUNCTION (FRF) MEASUREMENT

SINERGI ◽  
2018 ◽  
Vol 22 (3) ◽  
pp. 161
Author(s):  
Subekti Subekti
Keyword(s):  
Diesel Engine ◽  
Frequency Response ◽  
Response Function ◽  
Dynamic Characteristics ◽  
Frequency Response Function ◽  
Natural Frequencies ◽  
Vibration Mode ◽  
Valve Train ◽  
Operating Life ◽  
Local Vibration

This research was conducted on Diesel engine single cylinder which aims to study the dynamic characteristics of Diesel engine type HATZ 1D 80 made in Germany. The test was performed by measuring the Frequency Response Function (FRF). In this study, the vibration response was measured at three points: point A which was situated below the engine shaft and in line with the stinger. Point A indicated the FRF point. Point B was located in the valve train component, while point C was situated above the cap of the valve train component. The range of frequencies applied was 0 - 3200 Hz, 3200 - 6400 Hz, 6400 - 9600 Hz, and 9600 - 11200 Hz. This research indicates that the natural frequencies arose because of the global vibration mode. The global vibration mode occurred at natural frequencies of 3118, 4805, 4821, 5021, 7129, 8601, and 11107 Hz. While other natural frequencies were associated with the local vibration mode because it appears only at one point of measurement.

A Study of Performance Influence Caused by Mode Interference for Vibratory Cylindrical Gyroscope

2013 ◽  
Vol 834-836 ◽  
pp. 1540-1543
Author(s):  
Yi Tao ◽  
Ding Bang Xiao ◽  
Bao Jun Wang ◽  
De Fu Sun ◽  
Jiang Wei Li ◽  
...  
Keyword(s):  
Frequency Response ◽  
Vibration Mode ◽  
Zero Bias ◽  
Steel Base ◽  
Working Frequency ◽  
Bias Instability ◽  
Mode Interference

The interference mode has a significant bad influence on the performance of the VCG, in order to reduce the interference, the interference modes frequency should be far away from the working frequency of the VCG. In this article, the FEM software ANASYS is used to analyze the vibration mode of the resonator with a PCB base and a steel base, the frequency response of these two kinds resonators are measured, finally, the performance of the gyroscopes are tested. From the testing results we can find, by changing the resonators base from PCB to steel, the interference mode is eliminated, and the zero-bias instability of the gyroscope is improved from 3.37°/h to 0.73°/h.

Dynamic Characteristics of Infants Riding on Stroller

2020 ◽  
Author(s):  
Hiroyuki Okajima ◽  
Shinichiro Ota ◽  
Ryo Ota
Keyword(s):  
Frequency Response ◽  
Transient Response ◽  
Upper Limb ◽  
Lower Limb ◽  
Vibration Mode ◽  
Vibration Characteristics ◽  
Vibration Modes ◽  
Response Characteristics ◽  
Resonance Frequencies ◽  
Frequency Response Characteristics

Abstract When a stroller with an infant ride over protrusions or irregularities, vibrations are transmitted from the infant’s lower limb to the upper limb through the tire-frame-cushion. To reduce the load on the infant, the challenge is to reduce the vibration at each part of the infant’s body. To design an equipment for reducing such vibration, it is important to understand the vibration characteristics of infants. Therefore, the purpose of this study was to clarify the vibration characteristics of infants. Transient and frequency response characteristics of the infant–stroller system were investigated by riding over protrusions and irregularities, respectively. In the transient response obtained by both wheels riding over the protrusion, the vibration of the head and chest is a mixture of the primary secondary vibration modes. In the transient response obtained with one wheel riding over the protrusion, the primary vibration mode becomes prominent when the vibration transmitted to the stroller seat is small, and the secondary vibration mode becomes prominent when the vibration transmitted to the stroller seat is large. The frequency response shows some resonance frequencies between 1 Hz and 6 Hz. Vibrations over 8 Hz have small effects on the infants because the acceleration ratio is low at values below 1.

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