Mechanical Drift of Ultrasonic-Linear-Motor-Driving Motion Platforms

2012 ◽  
Vol 190-191 ◽  
pp. 1311-1316 ◽  
Author(s):  
Jin Sha ◽  
Zhi Yuan Yao ◽  
Ran Ran Geng

During the experiment of cell poking, it is required that the point of a probe is aimed at the cell with the help of a precision motion platform, and then, controlled by this motion platform, the tip of the probe pokes into the cell. When these operations are done, the driving force of this platform will be removed. But within a certain period (for example, an hour), the platform doesn’t stop moving. This kind of movement, which should be only several microns, is termed in this paper as the mechanical drift of ultrasonic linear motors. Experiments show that the forms used for clamping the stator is one of the factors that affect the mechanical drift. It is studied through experiments the impacts of several clamping forms on mechanical drift, the drift value’s relationship with the slide rail’s damping and the motor’s step size, and how the drift direction is related to the motion direction. The mechanism of mechanical drift of ultrasonic linear motors has also been explored preliminarily. This kind of research will facilitate refinements of the design and control methods for ultrasonic linear motor as well as motion platforms.

2012 ◽  
Vol 182-183 ◽  
pp. 1673-1680
Author(s):  
Yu Wang ◽  
Ri Na Su

A kind of 3-RPS and 3-DOF parallel robotic mechanisms is used as motion-sensible-platform of gun training simulator to implement the motion simulation. Its dynamics is analyzed and driving force of joint is gained. This paper introduces the study on motion generation of gun training simulator. The moving model of gun is established on the basis of the model of vehicle. We solve the pose of gun by applying the theory of homogeneous matrix. In order to ensure actuators moving at a preset speed and enable the motion-sensible-platform to perform a real-time moving posture simulation of a wheeled gun vehicle in running, the speed equation of actuator is given. The feasibility of models was tested through the simulation experiments. All of these works are beneficial to optimize design and control realization of motion platform structure.


2019 ◽  
Vol 27 (7) ◽  
pp. 1536-1543
Author(s):  
王荣坤 WANG Rong-kun ◽  
于作超 YU Zuo-chao ◽  
王 杰 WANG Jie

Author(s):  
Shalom D. Ruben ◽  
Tsu-Chin Tsao ◽  
Robert J. Hocken ◽  
Ronnie Fesperman ◽  
Ozkan Ozturk ◽  
...  

High precision motion is critical in the semiconductor industry and as feature size continues to decrease, the need for higher precision increases. This paper presents the control system design and integration of a novel multi-degree of freedom precision stage for nano-manufacturing. It is composed of a 6 DOF wafer holder and a 3 DOF module holder. The modules can be chosen for a desired task, such as a nano-imprint lithography module. Capacitance gauges, interferometers, and photo detectors provide position feedback of the stage. Piezo-electric actuators and linear motors, that produce two orthogonal forces each, produce the desired output. Modeling of the coordinate transformation among the spaces of sensors, stage position, and actuators along with dynamic modeling of the stage is presented. Controller design, hardware, and software is described and results comparing simulation and implementation show a closed-loop positioning of less than 1 nm error in x and y and 0.01 arc seconds in θz with a sensor noise level of less than 0.2 nm.


2017 ◽  
Vol 12 ◽  
pp. 108
Author(s):  
Evžen Thöndel

Interactive motion platforms are intended for vehicle simulators, where the direct interaction of the human body is used for controlling the simulated vehicle (e.g. bicycle, motorbike or other sports vehicles). The second use of interactive motion platforms is for entertainment purposes or fitness. The development of interactive motion platforms reacts to recent calls in the simulation industry to provide a device, which further enhances the virtual reality experience, especially with connection to the new and very fast growing business in virtual reality glasses. The paper looks at the design and control of an interactive motion platform with two degrees of freedom to be used in virtual reality applications. The paper provides the description of the control methods and new problems related to the virtual reality sickness are discussed here.


2021 ◽  
Vol 226 ◽  
pp. 108826
Author(s):  
Chenguang Liu ◽  
Junlin Qi ◽  
Xiumin Chu ◽  
Mao Zheng ◽  
Wei He

Sign in / Sign up

Export Citation Format

Share Document