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Temperature characteristics of ultrasonic suspension Experimental study and finite element analysis

Author: CuiWeiFang
Tutor: ZhaoBo
School: Henan Polytechnic University
Course: Mechanical Design and Theory
Keywords: Uniaxial ultrasound suspension No container handling Acoustic radiation pressure
CLC: TB559
Type: Master's thesis
Year: 2009
Downloads: 36
Quote: 0
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Abstract


Ultrasound suspension is an important non- container processing technology, it is able to simulate the space environment , avoiding contact with the object and the container wall , while there is no electromagnetic properties of an object flying in the special requirements , in principle, can be suspended material of any nature , and does not generate additional thermal effects, so in a variety of suspension technology favorites. However , the sound processing suspension no container in the heating process is carried out , the heating process will affect the physical condition of the sound field and could lead to failure of the experiment . Therefore, in the acoustic levitation without heating the container during the experiment , to understand the temperature change on the suspension performance is very necessary. Thesis basic principles of ultrasonic suspension based on the analysis , the development of a set of temperature-controlled ultrasonic levitation device axis . Papers on different parameters suspension suspension device performance experimental study found that use of concave spherical reflector plate suspension was significantly stronger than the plane reflector plate , and found that the use of appropriate radius of curvature and the larger cross-sectional radius of the disk can be significantly reflected improve acoustic levitation force . In addition , the paper samples were also different heating experiments , the realization of steel balls, ceramic balls, plastic balls , respectively, at 56 ℃, 133 ℃, 208 ℃ the stable suspension resonance spacing found to increase with increasing temperature during the experiment, the need to constantly tuned resonance spacing increases , the sound field to achieve resonance , in order to achieve a stable suspension of the sample . Established a uniaxial ultrasound suspension system of the finite element model, using numerical analysis methods discussed emitter plate with different sectional radius , the radius of curvature of the concave spherical different combination of suspension performance , and analyze the sound field at different temperatures , calculated the different temperatures acoustic radiation pressure . The analysis revealed that acoustic radiation pressure as the temperature rises rapidly decay , when the temperature is increased to 150 ℃ , the maximum acoustic radiation pressure is reduced by 60 % and the temperature changes on the acoustic radiation pressure effects than the impact on the resonance spacing more intense .

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CLC: > Industrial Technology > General industrial technology > Acoustic engineering > Ultrasonic Engineering > The application of ultrasound
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