Noncontact Planar Stage Based on Near-Field Acoustic Transportation

2020 ◽  
Vol 8 (2) ◽  
Author(s):  
Yang Yang ◽  
Keyu Chen ◽  
Ping Guo
Keyword(s):  
Reynolds Equation ◽  
Closed Loop ◽  
Acoustic Radiation ◽  
Dimensional Space ◽  
Near Field ◽  
Radiation Force ◽  
Driving Mechanism ◽  
Two Dimensional ◽  
Closed Loop System ◽  
Novel Design

Abstract Acoustic radiation force in the near-field of a vibrating source can be utilized to lift and transport objects, which provides a noncontact driving technology in addition to maglev. This paper presents a novel design of a self-levitated planar stage based on near-field acoustic transportation. A closed-loop system is proposed to design a capacitance surface encoder to provide direct two-dimensional (2D) position feedback. A dynamic model based on the Reynolds equation is established to study its driving mechanism. A prototype including the levitation stage, encoder, and controller is implemented to demonstrate the potential of arbitrary trajectory tracking in two-dimensional space.

scholarly journals An Overshoot-Constrained Fast Setpoint Control for Nanopositioning Systems with Switched Controllers

2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
Zhizheng Wu ◽  
Tengfei Yue ◽  
Xinxiang Jiang ◽  
Ning Cao ◽  
Feng Li ◽  
...  
Keyword(s):  
Pid Controller ◽  
Closed Loop ◽  
Control Method ◽  
Near Field ◽  
Experimental System ◽  
Matrix Inequalities ◽  
Closed Loop System ◽  
Synthesis Algorithm ◽  
Key Technology ◽  
Near Field Optics

Nanopositioning control as the key technology has been applied in many fields such as near-field optics, biomedical engineering, and nanomanipulation, where it is required to possess high positioning accuracy, reliability, and speed. In this paper, a switched PID controller-based fast setpoint control method is proposed for nanopositioning systems. In order to improve the setpoint speed of the nanopositioning system without a large overshoot, a switched controller consisting of the approach mode and smooth mode is synthesized. The overshoot constraint of the resulting switched closed-loop system is investigated within a set of bilinear matrix inequalities, based on which the search of the controller parameters can be further processed by solving the properly formulated synthesis algorithm. The proposed control method is evaluated in a nanopositioning experimental system driven by a PZT actuator, and the experimental results demonstrate the effectiveness of the switched PID controller for the fast setpoint approaching operation.

H∞ control for a class of two-dimensional linear systems with fading measurements

2020 ◽  
pp. 014233122094462
Author(s):  
Wei Yu ◽  
Rui Wang ◽  
Xuhui Bu ◽  
Jiaqi Liang
Keyword(s):  
Closed Loop ◽  
Sufficient Conditions ◽  
Lyapunov Stability Theory ◽  
Linear Matrix ◽  
Two Dimensional ◽  
Closed Loop System ◽  
Discrete Time Systems ◽  
Control Schemes ◽  
Darboux Equation ◽  
Time Systems

In this paper, the [Formula: see text] control problem for a class of two-dimensional (2-D) linear discrete-time systems with fading measurements is investigated, where the 2-D systems are described by a Roesser model. The Rice fading model is applied to describe the fading phenomenon and the coefficients of the model satisfy the independent identical Gaussian distributions. The main objective of this paper is to design a controller such that both the 2-D closed-loop system is exponentially mean-square stable and the prescribed [Formula: see text] performance is guaranteed under the condition of applying the attenuation signals. By utilizing the Lyapunov stability theory and the linear matrix inequalities (LMIs) techniques, sufficient conditions are conducted to guarantee the desired tracking performance. Based on such conditions, the gain matrix of the proposed controller is obtained. Finally, the effectiveness of the proposed control schemes is illustrated with a numerical example and a Darboux equation example.

Acoustic radiation force on a rigid sphere in the near field of a circular piston vibrator

1990 ◽  
Vol 88 (3) ◽  
pp. 1578-1583 ◽  
Author(s):  
Takahi Hasegawa ◽  
Tohru Kido ◽  
Shigeki Takeda ◽  
Naoki Inoue ◽  
Kiichiro Matsuzawa
Keyword(s):  
Acoustic Radiation ◽  
Near Field ◽  
Radiation Force ◽  
Acoustic Radiation Force ◽  
Rigid Sphere

scholarly journals Two-Dimensional Mapping Separating the Acoustic Radiation Force and Streaming in Microfluidics

2019 ◽  
Vol 11 (4) ◽  
Author(s):  
Shilei Liu ◽  
Zhengyang Ni ◽  
Guangyao Xu ◽  
Xiasheng Guo ◽  
Juan Tu ◽  
...  
Keyword(s):  
Acoustic Radiation ◽  
Radiation Force ◽  
Acoustic Radiation Force ◽  
Two Dimensional ◽  
Dimensional Mapping

scholarly journals Manipulation of particles in two dimensions using phase controllable ultrasonic standing waves

2011 ◽  
Vol 468 (2138) ◽  
pp. 337-360 ◽  
Author(s):  
C. R. P. Courtney ◽  
C.-K. Ong ◽  
B. W. Drinkwater ◽  
A. L. Bernassau ◽  
P. D. Wilcox ◽  
...  
Keyword(s):  
Acoustic Radiation ◽  
Sudden Change ◽  
Standing Waves ◽  
Radiation Force ◽  
Two Dimensions ◽  
Two Dimensional ◽  
Dimensional Plane ◽  
System A ◽  
Propagating Waves ◽  
The Relationship

The ability to manipulate dense micrometre-scale objects in fluids is of interest to biosciences with a view to improving analysis techniques and enabling tissue engineering. A method of trapping micrometre-scale particles and manipulating them on a two-dimensional plane is proposed and demonstrated. Phase-controlled counter-propagating waves are used to generate ultrasonic standing waves with arbitrary nodal positions. The acoustic radiation force drives dense particles to pressure nodes. It is shown analytically that a series of point-like traps can be produced in a two-dimensional plane using two orthogonal pairs of counter-propagating waves. These traps can be manipulated by appropriate adjustment of the relative phases. Four 5 MHz transducers (designed to minimize reflection) are used as sources of counter-propagating waves in a water-filled cavity. Polystyrene beads of 10 μm diameter are trapped and manipulated. The relationship between trapped particle positions and the relative phases of the four transducers is measured and shown to agree with analytically derived expressions. The force available is measured by determining the response to a sudden change in field and found to be 30 pN, for a 30 V pp input, which is in agreement with the predictions of models of the system. A scalable fabrication approach to producing devices is demonstrated.

Estimation of Acoustic Energy and Performance Characterization of Acoustic Concentrator

2016 ◽  
Vol 842 ◽  
pp. 217-227
Author(s):  
Min Htike Thein ◽  
Kian Meng Lim
Keyword(s):  
Energy Density ◽  
Particle Concentration ◽  
Acoustic Radiation ◽  
Radiation Force ◽  
Ultrasonic Field ◽  
Acoustic Energy ◽  
Two Dimensional ◽  
Ultrasonic Standing Wave ◽  
Acoustic Energy Density

Among many methods of particle concentration in liquid, acoustic concentrator uses ultrasonic standing wave to concentrate microparticles in liquid. In order to determine its performance on particle concentration, estimation of acoustic energy density inside the concentrator is important since energy density is the main contributing factor in calculating the primary acoustic radiation force acting on the particles. The balance between the primary radiation force and hydrodynamic force acting on the particles inside the acoustic concentrator determine the performance of the acoustic concentrator. Therefore, this study focuses on the measurement of acoustic energy density inside the h-shaped acoustic concentrator and characterization of performance of the concentrator. First, energy density is estimated by curve-fitting the experimental particle position in the ultrasonic field with one-dimensional theoretical position. Second, two-dimensional acoustic and hydrodynamic fields are determined using two-dimensional simulation model in COMSOL Multiphysics. Integrating the governing equation for particle motion in the balance of acoustic and hydrodynamic forces result in the particle trajectory and it is compared with the experimental observation. The results would provide deeper insight into the operation of acoustic concentrator and the detailed phenomenon of particle motions inside the concentrator.

Characteristics of Underwater Near-Field Acoustic Radiation Force Acting on a Planar Object

1999 ◽  
Vol 38 (Part 2, No. 11A) ◽  
pp. L1284-L1285 ◽  
Author(s):  
Toru Hatanaka ◽  
Yoshikazu Koike ◽  
Kentaro Nakamura ◽  
Sadayuki Ueha ◽  
Yoshiki Hashimoto
Keyword(s):  
Acoustic Radiation ◽  
Near Field ◽  
Radiation Force ◽  
Acoustic Radiation Force
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