Simulation and Experiment Researches on Acoustic Field of Spherical Shell Focused Ultrasonic Transducer

2013 ◽  
Vol 770 ◽  
pp. 281-284
Author(s):  
Zhen Yin ◽  
Hua Li ◽  
Zi Yang Cao ◽  
Yu Can Fu
Keyword(s):  
Spherical Shell ◽  
Acoustic Field ◽  
Acoustic Pressure ◽  
Ultrasonic Transducer ◽  
Pressure Curve ◽  
Bending Vibration ◽  
Element Simulation ◽  
Ultrasonic Technology ◽  
Simulation And Experiment ◽  
Simulation Results

Aiming at the deficiency of existing focused ultrasonic technology, a new high-power Spherical Shell Focused Ultrasonic Transducer (SSFUT) was designed. The SSFUT is composed of a sandwich piezoelectric ultrasonic transducer and a bending vibration spherical shell. Simulation on acoustic field of SSFUT was carried out. the acoustic field pressure distribution nephogram and the axial acoustic pressure curve of the SSFUT were obtained. The consistency of finite element simulation results and experimental results was verified by testing. The research provides a theoretical basis for implementation and application of the new focused ultrasonic technology.

To Improve Micro-Planar-Magnetic Generator Performance Based on Addition of Magnetic Material

2015 ◽  
Vol 645-646 ◽  
pp. 1195-1200
Author(s):  
Lin Du ◽  
Geng Chen Shi ◽  
Jing Jing Zhao
Keyword(s):  
Magnetic Material ◽  
Finite Element ◽  
Rotational Speed ◽  
Output Voltage ◽  
Experimental Results ◽  
Element Simulation ◽  
Simulation And Experiment ◽  
Simulation Results ◽  
Generator Performance ◽  
Magnetic Generator

By finite element simulation and experiment, this paper compares the performance of generators with magnetic material to generators without magnetic material (Fe) in its coil and analyzes the reason why there is difference between simulation results and experimental results. Experimental results present that under the same rotational speed, output voltage improves 60% with the addition of magnetic material in coil compared to generator without magnetic material in coil. We further discuss the feasibility to add magnetic material in coil, present the existed problems and improvement methods.

Experimental and Numerical Investigation of the Effect of Anisotropy on Springback in U-Bending Process

2011 ◽  
Vol 473 ◽  
pp. 645-652
Author(s):  
Vahid Daiezadeh ◽  
Majid Elyasi ◽  
Behzad Rahmani ◽  
Mohammad Bakhshi-Jooybari
Keyword(s):  
Finite Element ◽  
Steel Sheet ◽  
Experimental Approach ◽  
Rolling Direction ◽  
Bending Angle ◽  
Finite Element Software ◽  
Element Simulation ◽  
Bending Process ◽  
Simulation And Experiment ◽  
Simulation Results

In this research, the effect of anisotropy on springback in CK67 steel sheet in U-bending process was studied by finite element simulation and experimental approach. The finite element software, ABAQUS/EXPLICIT 6.7, was used for simulation. In order to verify the simulation results some experiments were performed. The obtained results indicated that increasing the bending angle to the rolling direction resulted in an increase in springback. The results of the experiments were compared with simulation results. There was significant agreement between simulation and experiment.

Investigation of Die Corner Filling in Hydroforming of Cylindrical Stepped Tubes Using Finite Element Simulation and Experiment

2009 ◽  
Vol 410-411 ◽  
pp. 335-343
Author(s):  
Mohammad Bakhshi-Jooybari ◽  
Majid Elyasi ◽  
A. Gorji ◽  
G. Mohammad-Alinejad ◽  
S.J. Hosseinipour ◽  
...  
Keyword(s):  
Material Flow ◽  
Tube Hydroforming ◽  
Fem Simulation ◽  
Complete Filling ◽  
Element Simulation ◽  
Hydroforming Process ◽  
Simulation And Experiment ◽  
Simulation Results ◽  
Corner Filling ◽  
Tubular Components

Seamless tubular components, such as stepped tubes, conical tubes and box shape tubes, are mainly produced in tube hydroforming process. In forming the components in this process, complete filling the die corners is very difficult. In this paper, the mechanism of improvement of die corner filling in a proposed tube hydroforming die was investigated. The FEM simulation results showed that the material flow and stress distribution could theoretically clarify the die corner filling in the proposed die. Also, the comparison of the die corner filling between the new die and a conventional die was explained. In order to verify the simulation results, some experiments were performed.

Simulation and Experiment of New Longitudinal-Torsional Composite Ultrasonic Elliptical Vibrator

2011 ◽  
Vol 338 ◽  
pp. 79-83 ◽  
Author(s):  
Zhen Yin ◽  
Hua Li ◽  
Zi Yang Cao ◽  
Ou Xie ◽  
Yan Li
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Design Method ◽  
Laser Doppler Vibrometer ◽  
Torsional Vibrations ◽  
Impedance Analyzer ◽  
Elliptic Vibration ◽  
Element Simulation ◽  
Simulation And Experiment ◽  
Simulation Results

A new ultrasonic elliptic vibrator design method was proposed, the ultrasonic elliptic vibration was achieved by the structural curve of the longitudinal and torsional vibrations. The model, harmonic and transient analyses of the new longitudinal-torsional composite ultrasonic elliptical vibrator were performed by using the software ANSYS, the prototype of the new vibrator was tested by using impedance analyzer and PSV-400 laser Doppler vibrometer, the correctness of the finite element simulation results and the feasibility of the new longitudinal-torsional composite ultrasonic elliptical vibrator design methods were verified.

scholarly journals GPU Accelerated Acoustic Field Determination for a Continuously excited Circular Ultrasonic Transducer

2020 ◽  
Vol 53 (2) ◽  
pp. 10480-10484
Author(s):  
Alberto Lemos Duran ◽  
André K. Sato ◽  
Agesinaldo M. Silva ◽  
Ediguer E. Franco ◽  
Flávio Buiochi ◽  
...  
Keyword(s):  
Acoustic Field ◽  
Ultrasonic Transducer

scholarly journals Automated Insertion of Objects Into an Acoustic Robotic Gripper

Proceedings ◽  
2020 ◽  
Vol 64 (1) ◽  
pp. 40
Author(s):  
Marc Röthlisberger ◽  
Marcel Schuck ◽  
Laurenz Kulmer ◽  
Johann W. Kolar
Keyword(s):  
Acoustic Field ◽  
Acoustic Waves ◽  
Acoustic Pressure ◽  
Pressure Field ◽  
Acoustic Power ◽  
Industrial Applications ◽  
High Density ◽  
Analytical Models ◽  
Acoustic Levitation ◽  
Mechanical Contact

Acoustic levitation forces can be used to manipulate small objects and liquid without mechanical contact or contamination. To use acoustic levitation for contactless robotic grippers, automated insertion of objects into the acoustic pressure field is necessary. This work presents analytical models based on which concepts for the controlled insertion of objects are developed. Two prototypes of acoustic grippers are implemented and used to experimentally verify the lifting of objects into the acoustic field. Using standing acoustic waves and by dynamically adjusting the acoustic power, the lifting of high-density objects (>7 g/cm3) from acoustically transparent surfaces is demonstrated. Moreover, a combination of different acoustic traps is used to lift lower-density objects from acoustically reflective surfaces. The provided results open up new possibilities for the implementation of acoustic levitation in robotic grippers, which have the potential to be used in a variety of industrial applications.

scholarly journals A System in Package Based on a Piezoelectric Micromachined Ultrasonic Transducer Matrix for Ranging Applications

Sensors ◽  
2021 ◽  
Vol 21 (8) ◽  
pp. 2590
Author(s):  
Alexandre Robichaud ◽  
Dominic Deslandes ◽  
Paul-Vahé Cicek ◽  
Frederic Nabki
Keyword(s):  
High Voltage ◽  
Integrated Circuit ◽  
Ultrasonic Transducer ◽  
Ultrasonic Transducers ◽  
Transimpedance Amplifier ◽  
Measurement Results ◽  
Ultrasonic Ranging ◽  
High Voltage Pulser ◽  
Working Frequency ◽  
Simulation Results

This paper proposes a system in package (SiP) for ultrasonic ranging composed of a 4 × 8 matrix of piezoelectric micromachined ultrasonic transducers (PMUT) and an interface integrated circuit (IC). The PMUT matrix is fabricated using the PiezoMUMPS process and the IC is implemented in the AMS 0.35 µm technology. Simulation results for the PMUT are compared to the measurement results, and an equivalent circuit has been derived to allow a better approximation of the load of the PMUT on the IC. The control circuit is composed of a high-voltage pulser to drive the PMUT for transmission and of a transimpedance amplifier to amplify the received echo. The working frequency of the system is 1.5 MHz.

Virtual Material Model of Joint Interfaces Considering Elastic-Plastic Deformation of Asperities

2013 ◽  
Vol 457-458 ◽  
pp. 257-261
Author(s):  
Li Gang Cai ◽  
Teng Yun Xu ◽  
Yong Sheng Zhao
Keyword(s):  
Plastic Deformation ◽  
Elastic Modulus ◽  
Fractal Theory ◽  
Material Model ◽  
Contact Theory ◽  
Hertz Contact ◽  
Calculation Methods ◽  
Elastic Plastic ◽  
Element Simulation ◽  
Simulation Results

A virtual material model of joint interfaces was established based on the Hertz contact theory and fractal theory, this model was improved by considering the influence of the elastic-plastic deformation of asperities and ameliorating the calculation methods of the elastic modulus. The simulation results of elastic-plastic considered and elastic-plastic unconsidered were compared, moreover, the finite element simulation results and experimental results were compared to fully explain the necessity of considering the influence of the elastic-plastic deformation and the the correctness of the method to calculate the elastic modulus. The research suggested that under a same load the elastic modulus of the model considering the influence of the elastic-plastic deformation was slightly larger than the un considering one, which means it could describe the characteristics of joint interfaces more accurately.

scholarly journals The Effect of Layer Variation Between Liner and Cement Mantle on Reducing Cracks of PMMA Material Hip Joints

2018 ◽  
Vol 73 ◽  
pp. 12013
Author(s):  
Eko Saputra ◽  
J Jamari ◽  
Han Ay Lie ◽  
Iwan Budiwan Anwar ◽  
Rifky Ismail ◽  
...  
Keyword(s):  
Finite Element ◽  
Hip Replacement ◽  
Cement Mantle ◽  
Initial Crack ◽  
Thickness Variation ◽  
Hip Joints ◽  
Element Simulation ◽  
Two Factors ◽  
Simulation Results ◽  
Reducing Stress

Failure of cement mantle of bond loosening between liner and cement mantle is an important issue in total hip replacement. Two factors that commonly cause cement mantle failure are initial crack and stress. A solution for reducing stress on the cement mantle has been proposed by adding insertion material between liner and cement mantle. Nevertheless, further study is needed to optimize the proposed solution. A possible option is to vary the thickness of the insertion material. If the thickness of the PMMA material is constant, then the variation of the insertion thickness will be followed by the variation of the thickness of the liner. Consequently, the stress value on the liner will follow the variation of liner thickness. The objective of this study is to examine the effect of the thickness variation of the insertion material to stress on cement mantle and liner using finite element simulation. Results revealed that the magnitude of stress and deflection decreased in the cement mantle and the liner along with the increasing thickness of the insertion material.

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