Characterization of 0.5 MHz Silicon-Based Ultrasonic Nozzles Using Multiple Fourier Horns

2003 ◽  
Vol 782 ◽  
Author(s):  
Shirley C. Tsai ◽  
Yu L. Song ◽  
Yuan F. Chou ◽  
Terry K. Tseng ◽  
W. J. Chen ◽  
...  
Keyword(s):  
Resonant Frequency ◽  
Vibration Amplitude ◽  
Longitudinal Vibration ◽  
Impedance Analysis ◽  
Experimental Results ◽  
Vibration Measurement ◽  
Drive Power ◽  
Cross Sectional ◽  
Half Wavelength ◽  
Silicon Based

ABSTARCTThis paper presents the experimental results of impedance analysis and longitudinal vibration measurement of micro-fabricated 0.5 MHz silicon-based ultrasonic nozzles. Each nozzle is made of a piezoelectric drive section and a silicon-resonator consisting of multiple Fourier horns each with half wavelength design and twice amplitude magnification. The experimental results verified the simulation prediction of one pure longitudinal vibration mode at the resonant frequency in excellent agreement with the design value. Furthermore, at the resonant frequency, the measured longitudinal vibration amplitude gain at the nozzle tip increases as the number of Fourier horns (n) increases in good agreement with the theoretical value of 2n. Using this design, very high vibration amplitude at the nozzle tip can be achieved with no reduction in the tip cross sectional area. Therefore, the required electric drive power should be drastically reduced, decreasing the likelihood of transducer failure in ultrasonic atomization.

Modeling and Simulation of a High Frequency MEMS-Fabricated Ultrasonic Nozzle

2002 ◽  
Vol 729 ◽  
Author(s):  
S. C. Tsai ◽  
T.K. Tseng ◽  
Y. L. Song ◽  
Y. F. Chou ◽  
C. S. Tsai ◽  
...  
Keyword(s):  
Resonant Frequency ◽  
High Frequency ◽  
Longitudinal Vibration ◽  
Ambient Pressure ◽  
Nanoparticle Synthesis ◽  
Frequency Increase ◽  
Drive Power ◽  
Ultrasonic Atomization ◽  
Half Wavelength ◽  
Design Value

AbstractThis paper reports on the design and simulation of micro-fabricated 0.5 MHz Si-based ultrasonic nozzles that consist of multiple sections of Fourier horns of half wavelength design. Such high frequency ultrasonic nozzles should produce 10-15μm-diameter uniform precursor drops for nanoparticle synthesis by means of spray pyrolysis at ambient pressure. Results of 3-D simulation using a commercial FEM program, ANSYS, show existence of one resonant frequency of pure longitudinal vibration, which is very close to the design value. The results also show that at this resonant frequency increase in vibration amplitude at the nozzle tip is very close to the theoretical values of 2n, where n is the number of horn section. Therefore, the required electric drive power should be drastically reduced and the transducer failure in ultrasonic atomization can be more readily avoided.

Photothermal Response in Semiconducting Microcantilevers Produced by Laser Excitation

2013 ◽  
Vol 705 ◽  
pp. 81-84
Author(s):  
Ya Qin Song ◽  
Xiao Gang Yang
Keyword(s):  
Resonant Frequency ◽  
Probe Beam ◽  
Vibration Amplitude ◽  
Laser Excitation ◽  
Modulation Frequency ◽  
Elastic Vibration ◽  
Pump Laser ◽  
Experimental Results ◽  
Optically Detected ◽  
Good Agreement

The elastic vibration of semiconducting microcantilever, which was excited with a frequency-modulated pump laser, was optically detected use another probe beam. The photothermal signals were measurement near the resonant frequency. The changes of vibration amplitude and phase with the change of modulation frequency were obtained for a set of different sized microcantilevers. The results showed that the experimental results had a good agreement with the theoretical ones.

Design and Tuning of the Ultrasonic Wide-Blade Horn for Joining and Cutting Non-Woven Fabrics

2014 ◽  
Vol 941-944 ◽  
pp. 1932-1936
Author(s):  
Chang Hee Lee ◽  
Jeong Seok Seo ◽  
Dong Sam Park
Keyword(s):  
Resonant Frequency ◽  
Vibration Amplitude ◽  
Woven Fabrics ◽  
Experimental Results ◽  
Cutting Process ◽  
Operating Frequency ◽  
Response Analysis ◽  
Harmonic Response ◽  
Output Surface ◽  
Harmonic Response Analysis

For joining and cutting non-woven fabrics, an ultrasonic wide-blade horn is expected to be used effectively. During the joining and cutting process, this horn can work as the punch in the punching and blanking systems. The performance of a wide-blade horn is normally relevant to the resonance at the operating frequency, the vibration amplitude, and the uniformity of the amplitude on the output surface. In this study, an ultrasonic wide-blade horn is optimally designed and fabricated for joining and cutting non-woven fabrics, and it is tuned to operate at 20 kHz, the resonant frequency of the converter. Analytic and experimental results show that based on the modal and harmonic response analysis and repeated tuning, the wide-blade horn could be optimally designed and fabricated. The resonant frequency of the developed horn was 19,979 Hz, and the amplitude uniformity of the output surface was 76%.

Design and Simulation of Silicon-Based Ultrasonic Nozzles for Production of Monodispersed Droplets

2007 ◽  
Author(s):  
C. H. Cheng ◽  
N. Wang ◽  
Y. L. Song ◽  
S. C. Tsai ◽  
Y. F. Chou ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Mode Shape ◽  
High Frequency ◽  
Vibration Amplitude ◽  
Vibration Mode ◽  
Longitudinal Vibration ◽  
Ultrasonic Frequency ◽  
Resonant Frequencies ◽  
Silicon Based ◽  
Good Agreement

This paper reports the design and simulation of Si-based ultrasonic nozzles (or atomizers) that consist of multiple Fourier horns at ultrasonic frequency ranging from 0.57 to 2.75 MHz. Such high frequency ultrasonic nozzles should produce monodispersed droplets (or drops) 2 to 6 μm in diameter, which are ideal to efficiently target medications to different locations within the respiratory system depending on the site of disease. 3-D simulations on vibration mode shape and impedance of the nozzles using a commercial finite element method (FEM) program, ANSYS, yield resonant frequencies of pure longitudinal vibration in good agreement with the measured values. The mode shape simulation also shows that at the resonant frequency the longitudinal vibration amplitude gain at the nozzle tip for 3-horn nozzle is 8, four times that for a single-horn nozzle.

Effect of Varied Probe Length on the Resonant Frequency of a Circular Cross-Sectional Cavity

2005 ◽  
Vol 2 (2) ◽  
pp. 79
Author(s):  
Mohd Khairul Mohd Salleh ◽  
Mohamad Syukri Suhaili ◽  
Zuhani Ismail ◽  
Zaiki Awang
Keyword(s):  
Resonant Frequency ◽  
Cavity Resonator ◽  
Simple Design ◽  
Cross Sectional ◽  
Probe Length ◽  
Mode Wave ◽  
The One

A simple design of a metallic circular cross-sectional air-filled cavity is presented. Two probes of varied lengths are used to excite TE112-mode wave into the cavity to give a resonant frequency of 5.86 GHz. The experiments show that the resonant frequency of the cavity resonator decreases as the lengths of the probes are increased. The shortest probe in the range of study gives the closest resonant frequency to the one desired.

scholarly journals Gender-specific analysis for the association between trunk muscle mass and spinal pathologies

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yusuke Hori ◽  
Masatoshi Hoshino ◽  
Kazuhide Inage ◽  
Masayuki Miyagi ◽  
Shinji Takahashi ◽  
...  
Keyword(s):  
Muscle Mass ◽  
Bioelectrical Impedance ◽  
Vertical Axis ◽  
Impedance Analysis ◽  
Poor Quality ◽  
Trunk Muscle ◽  
Sagittal Vertical Axis ◽  
Cross Sectional ◽  
Lower Trunk ◽  
Significant Difference

AbstractWe investigated the relationship between trunk muscle mass and spinal pathologies by gender. This multicenter cross-sectional study included patients aged ≥ 30 years who visited a spinal outpatient clinic. Trunk and appendicular muscle mass were measured using bioelectrical impedance analysis. The Oswestry Disability Index (ODI), visual analog scale (VAS) score for low back pain, sagittal vertical axis (SVA), and EuroQol 5 Dimension (EQ5D) score were investigated to evaluate spinal pathology. The association between trunk muscle mass and these parameters was analyzed by gender using a non-linear regression model adjusted for patients’ demographics. We investigated the association between age and trunk muscle mass. We included 781 men and 957 women. Trunk muscle mass differed significantly between men and women, although it decreased with age after age 70 in both genders. Lower trunk muscle mass was significantly associated with ODI, SVA, and EQ5D score deterioration in both genders; its association with VAS was significant only in men. Most parameters deteriorated when trunk muscle mass was < 26 kg in men and < 19 kg in women. Lower trunk muscle mass was associated with lumbar disability, spinal imbalance, and poor quality of life in both genders, with significant difference in muscle mass.

Review of Fire Performance Experiment of Concrete-Filled Steel Tubular Columns

2014 ◽  
Vol 638-640 ◽  
pp. 1397-1401
Author(s):  
Kai Xiang ◽  
Guo Hui Wang ◽  
Yan Chong Pan
Keyword(s):  
Load Ratio ◽  
Experimental Results ◽  
Research Progress ◽  
Future Research ◽  
Fire Performance ◽  
Cross Sectional ◽  
Tubular Columns ◽  
Cross Sectional Dimension ◽  
Cfst Columns ◽  
In Fire

This paper presents a review of research progress in fire performance of concrete-filled steel tubular (CFST) columns. Experimental results of CFST columns in fire are reviewed with influence parameters, such as heights, cross-sectional dimension, section types, concrete types, concrete strengths, load ratio, load eccentricity, fire exposed sides and so on. Some conclusions of CFST columns under fire conditions are summarized. Deficiencies in the fire performance experiments of CFST columns are identified, which provide the focus for future research in the field.

Study on a Novel MEMS High G Acceleration Sensor

2012 ◽  
Vol 490-495 ◽  
pp. 499-503
Author(s):  
Ping Li ◽  
Yun Bo Shi ◽  
Jun Liu ◽  
Shi Qiao Gao
Keyword(s):  
Resonant Frequency ◽  
Natural Frequency ◽  
Impact Load ◽  
Hopkinson Bar ◽  
Experimental Results ◽  
Structure Parameters ◽  
Acceleration Sensor ◽  
Piezoresistive Effect ◽  
Sensor Structure ◽  
The Impact

This paper presents a novel MEMS high g acceleration sensor based on piezoresistive effect. For the designed sensor structure, the formula of stress, natural frequency and damping was derived in theory, and the resonant frequency can up to 500kHz. After the structure parameters were designed, the sensor was fabricated by the standard processing technology, and the sensitivity was tested by Hopkinson bar. According to the experimental results, the sensitivity of the high g acceleration sensor is 0.125μV/g at the impact load of 164,002g.

An Experimental Method for Fast Evaluating Thermoelectric Generators Using one pair of P- and N-type Legs

2021 ◽  
pp. 1-12
Author(s):  
Ting Zhao ◽  
Kewen Li ◽  
Yuhao Zhu ◽  
Lin Jia ◽  
Xiaoyong Hou ◽  
...  
Keyword(s):  
Experimental Method ◽  
Output Power ◽  
Temperature Difference ◽  
Open Circuit Voltage ◽  
Open Circuit ◽  
Experimental Results ◽  
Single Pair ◽  
Thermoelectric Generators ◽  
Cross Sectional ◽  
Specific Temperature

Abstract Thermoelectric generators (TEG) are widely used in many industries. The voltage and output power of TEG chips are critical indicators to evaluate the performance of TEGs. The conventional method is to directly test the output voltage and power of the whole TEG chip that contains 127 pairs of PN (P- and N-type) legs (127-PN-TEG). However, the assembling of these PN legs is very time-consuming. In order to reduce experimental time and the consumption of TEG materials, we proposed an experimental method. We developed the test apparatus for the rapid evaluation of TEG performance using a TEG chip with a single pair of PN legs (1-PN-TEG). We made several 1-PN-TEGs and 127-PN-TEGs using the same thermoelectric material (bismuth telluride). We then measured the voltage and the power of these 1-PN-TEGs and 127-PN-TEGs, respectively. The experimental results were compared and analyzed. The comparison showed that the voltage of 127-PN-TEG is equal to the voltage of 1-PN-TEG times 127, which implies that we could use the test data of 1-PN-TEG to evaluate the performance of 127-PN-TEG. Using the experimental device developed in this paper, we also studied the effects of the PN leg area (cross-sectional area of PN legs) and the pressure applied over the TEGs on the output power of 1-PN-TEG. The experimental results showed that the power per unit area decreases with an increase in the 1-PN-TEG's PN leg area when the temperature difference between the hot and cold sides was constant. Under a specific temperature difference conditions, the open-circuit voltage and the output power will increase with the pressure applied on the TEG chips.

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