Method and system for generating vortex sound field by using transducer array
A transducer array, electro-acoustic transducer technology, applied in the direction of fluids, sensors, electrical components, etc. that utilize vibration, can solve problems such as unfavorable use of acoustic levitation technology, easy to be flattened, and unfavorable application of acoustic levitation technology, etc. question
Inactive Publication Date: 2020-04-28
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology
The disadvantage of standing wave acoustic levitation is that the suspended liquid or soft matter is easily crushed into a flat shape in the standing wave field, which is not conducive to the use of acoustic levitation technology
Near-field acoustic levitation can only suspend solids, and the distance between the acoustic emission surface and the solid surface is very close to the micron level, which is not conducive to the manipulation of suspended objects
In addition, neither the standing wave acoustic levitation nor the near-field acoustic levitation technology can control the rotation state of the suspended object, and the suspended object usually rotates randomly, which is not conducive to the application of the acoustic levitation technology
Method used
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specific Embodiment
[0019] Specific embodiment: this vortex field acoustic levitation device is made of the acoustic array that four electro-acoustic transducers (1-4) form and a cylindrical ring support 5, and the electro-acoustic transducer passes through the annular support to form a circle, Such as figure 2 shown. The acoustic emission end faces point to the same point in space and are arranged rotationally symmetrically around the same axis.
[0020] The material of the electro-acoustic transducer is stainless steel, and optional 45 steel, titanium alloy, etc.
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The invention relates to a method and system for generating a vortex sound field by using a transducer array. According to the system for generating the vortex sound field by using the transducer array, a plurality of electroacoustic transducers are arranged facing to the same point in space; all electroacoustic transducers work at the same frequency; and the phase difference between adjacent electroacoustic transducers is equal to an integral multiple of 2 pi divided by the number of electroacoustic transducers involved in an experiment. By optimizing the structures of the electroacoustic transducers, an object can be suspended by the vortex sound field; and by changing the phase directions of the electroacoustic transducers, the rotation of the suspended object can be controlled. According to the method for generating the vortex sound field by using the transducer array, a pollution-free non-contact acoustic suspension technology is provided; and the pollution-free non-contact acoustic suspension technology can be used for suspending solids and liquids, can actively control the rotation speed of the suspended object, and can be widely applied to the research fields of material science, physical chemistry, medical biology and the like.
Description
technical field [0001] The invention belongs to the acoustic levitation method and the field of acoustics, and relates to a method and a system for generating a vortex sound field by using a transducer array. Background technique [0002] At present, the methods of levitating objects mainly include: electrostatic levitation, electromagnetic levitation, pneumatic levitation, acoustic levitation, etc. Among them, the acoustic levitation method is a technology that uses the sound radiation force generated by a strong sound field to levitate objects. At present, the acoustic levitation technology mainly includes standing wave acoustic levitation technology and near-field acoustic levitation technology. The standing wave acoustic levitation system consists of one or more pairs of acoustic emission and reflection devices. The sinusoidal signal output by the signal generator is amplified by the power amplifier to drive the electroacoustic transducer to work and excite the surface ...
Claims
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IPC IPC(8): B06B1/02B06B3/00H04R9/02
CPCB06B1/02B06B3/00H04R9/02
Inventor 洪振宇张博文魏炳波
Owner NORTHWESTERN POLYTECHNICAL UNIV
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