scholarly journals Input Shaping Based on an Experimental Transfer Function for an Electrostatic Microscanner in a Quasistatic Mode

Micromachines ◽  
2019 ◽  
Vol 10 (4) ◽  
pp. 217 ◽  
Author(s):  
Kwanghyun Kim ◽  
Seunghwan Moon ◽  
Jinhwan Kim ◽  
Yangkyu Park ◽  
Jong-Hyun Lee
Keyword(s):  
Transfer Function ◽  
Dynamic Modeling ◽  
Experimental Results ◽  
Input Shaping ◽  
Driving Voltage ◽  
Driving Frequency ◽  
Optical Scan ◽  
Shaping Process ◽  
Electrostatic Torque ◽  
Scan Line

This paper describes an input shaping method based on an experimental transfer function to effectively obtain a desired scan output for an electrostatic microscanner driven in a quasistatic mode. This method features possible driving extended to a higher frequency, whereas the conventional control needs dynamic modeling and is still ineffective in mitigating harmonics, sub-resonances, and/or higher modes. The performance of the input shaping was experimentally evaluated in terms of the usable scan range (USR), and its application limits were examined with respect to the optical scan angle and frequency. The experimental results showed that the usable scan range is as wide as 96% for a total optical scan angle (total OSA) of up to 9° when the criterion for scan line error is 1.5%. The usable scan ranges were degraded for larger total optical scan angles because of the nonlinear electrostatic torque with respect to the driving voltage. The usable scan range was 90% or higher for most frequencies up to 160 Hz and was drastically decreased for the higher driving frequency because fewer harmonics are included in the input shaping process. Conclusively, the proposed method was experimentally confirmed to show good performance in view of its simplicity and its operable range, quantitatively compared with that of the conventional control.

Experimental and Numerical Hydrodynamic Modeling of an Underwater Manipulator

2001 ◽  
Author(s):  
A. Khanicheh ◽  
A. Tehranian ◽  
A. Meghdari ◽  
M. S. Sadeghipour
Keyword(s):  
Drag Coefficient ◽  
Dynamic Modeling ◽  
Hydrodynamic Model ◽  
Degrees Of Freedom ◽  
Added Mass ◽  
Hydrodynamic Modeling ◽  
Degree Of Freedom ◽  
Experimental Results ◽  
Underwater Manipulator ◽  
Three Degrees Of Freedom

Abstract This paper presents the kinematics and dynamic modeling of a three-link (3-DOF) underwater manipulator where the effects of hydrodynamic forces are investigated. In our investigation, drag and added mass coefficients are not considered as constants. In contrast, the drag coefficient is a variable with respect to all relative parameters. Experiments were conducted to validate the hydrodynamic model for a one degree-of-freedom manipulator up to a three degrees-of-freedom manipulator. Finally, the numerical and experimental results are compared and thoroughly discussed.

Initial Experiments on the Control of a Mobile Tower Crane

2007 ◽  
Author(s):  
Joshua Vaughan ◽  
William Singhose ◽  
Paulo Debenest ◽  
Edwardo Fukushima ◽  
Shigeo Hirose
Keyword(s):  
Theoretical Model ◽  
Material Handling ◽  
Operational Efficiency ◽  
Experimental Results ◽  
Input Shaping ◽  
Oscillatory Dynamics ◽  
Tower Crane ◽  
Operational Capabilities ◽  
The World

Cranes are used extensively throughout the world in a wide variety of construction and material handling applications. The speed at which these cranes are operated is limited by payload oscillation. Input shaping is one method that reduces this oscillation, allowing higher speeds and improving operational efficiency. Another method to improve the operational capabilities of cranes is to allow base motion. This paper presents initial experimental results from a portable, mobile tower crane. A theoretical model of the crane is presented and experimentally verified. The oscillatory dynamics of the crane are highlighted and controllers to combat these unwanted dynamics are presented.

Modified Zero Time Delay Input Shaping for Industrial Robot With Flexibility

2017 ◽  
Author(s):  
Yu Zhao ◽  
Masayoshi Tomizuka
Keyword(s):  
Time Delay ◽  
Vibration Suppression ◽  
Industrial Robot ◽  
Experimental Results ◽  
Input Shaping ◽  
Smooth Motion ◽  
Zero Time

Although input shaping is an effective approach for vibration suppression in a variety of applications, the time delay introduced is not desired. Current techniques to reduce the time delay can not guarantee zero delay or may cause non-smooth motion, which is harmful for the actuators. In order to address such issue, a modified zero time delay input shaping is proposed in this paper. Experimental results show the advantage of the proposed approach.

Improving Cylindrical Pin Cage Bearing Performance in Mill Applications Using Dynamic Modeling and Space Filling Design

2007 ◽  
Author(s):  
Bradley M. Pederson ◽  
Jerry Rhodes
Keyword(s):  
Transfer Function ◽  
Dynamic Modeling ◽  
Space Filling ◽  
Input And Output ◽  
Performance Response ◽  
Response Optimization ◽  
Space Filling Design

A dynamic cylindrical bearing model was modified to analyze large bore cylindrical mill bearings with pin cages. A factor-response methodology was coupled to the dynamic modeling input and output variables in order to generate a suitable transfer function for predicting bearing performance. Response optimization of the transfer function indicated that a traction-based parameter was determined to have the greatest effect on reducing roller slip and improving bearing performance.

On the Determination of the Transfer Function of Infinite Line Pressure Probes for Turbomachinery Applications

2012 ◽  
Author(s):  
Nicolas Van de Wyer ◽  
Jean-François Brouckaert ◽  
Rinaldo L. Miorini
Keyword(s):  
Transfer Function ◽  
Frequency Response ◽  
Pressure Fluctuations ◽  
Axial Compressor ◽  
Fast Response ◽  
Experimental Results ◽  
Geometrical Parameters ◽  
Electrical Transmission ◽  
Infinite Line ◽  
Line Pressure

This paper deals with the use of the infinite line pressure probes (ILP) to measure fluctuating pressures in hot environments in turbomachinery applications. These probes, sometimes called waveguide measuring systems, and composed of a series of lines and cavities are using a remote pressure sensor. Ideally they should form a non-resonant system. This is however not always the case and the frequency response of these systems is of course limited by the tubing (diameter and length) but is also highly dependent on other geometrical parameters like sudden expansions or discontinuities in the tubing, or parasite cavities. The development of a new model for ILP simulation, based on the analogy between the propagation of the pressure waves in a line-cavity system and the electrical transmission line, is presented. Unlike the models based on the Bergh and Tijdeman equations, this approach allows the simulation of systems presenting parallel branches. This makes the model appropriate for the prediction of the frequency response of ILP. The model is validated by a comparison of the results with the theory of Bergh and Tijdeman, and with experimental results from the literature and from shock tube tests. Finally, the model is applied for the optimization of ILPs, representative of the systems used in the aeronautics industry, and compared to the experimental results performed on an axial compressor. In those tests, a typical ILP geometry is installed on the compressor casing to measure static pressure fluctuations in the rotor tip gap. Simultaneous measurements with a fast response flush-mounted sensor provided data for comparison and validation of the predicted transfer function.

Fluid Structure Coupling Analysis of Ultrasonic Traveling Wave Driving

2012 ◽  
Vol 562-564 ◽  
pp. 1724-1727
Author(s):  
Chang Zhi Wei ◽  
Shou Shui Wei ◽  
Ya Tao Zhang ◽  
Chong Zhang
Keyword(s):  
Fluid Velocity ◽  
Element Model ◽  
Travelling Wave ◽  
Fluid Viscosity ◽  
Driving Voltage ◽  
Driving Frequency ◽  
Coupling Analysis ◽  
Fluid Structure ◽  
Resonance Frequencies ◽  
Driving Model

An ultrasonic travelling wave micro-fluid driving model was presented. Principle of the driving model was introduced and finite element model was developed. Resonance frequencies were predicted by modal analysis. Fluid structure coupling analysis was done to observe the transient fluid velocity. The time-averaged velocity was calculated. Influences of driving voltage, driving frequency and fluid viscosity on time-averaged velocity were taken into accounted. The results indicate that the time-averaged velocity profile is asymmetric parabola and is influenced by the driving frequency obviously. The maximum time-averaged velocity decreases with the increasing of fluid viscosity and reflux appears when the fluid viscosity reaches to 0.07Pa·s.

Simulation and Experimental Verification of Silicon Microgyroscope's Closed-Loop Driving Circuits Based on Cadence

2015 ◽  
Vol 645-646 ◽  
pp. 543-547
Author(s):  
Wei Feng Tang ◽  
Guo Ming Xia ◽  
An Ping Qiu ◽  
Yan Su
Keyword(s):  
Experimental Verification ◽  
Closed Loop ◽  
Experimental Results ◽  
Resonant Circuit ◽  
Driving Frequency ◽  
Q Value ◽  
Output Current ◽  
Series Resonant ◽  
Stability Time ◽  
Very High

The output-current of silicon microgyroscope is at the level of 10-7A, so the requirements for circuits’ SNR are very high. This paper conducts the simulation of closed-loop driving circuits in Cadence on the basis of a RLC series resonant circuit. It turns out that experimental results fit the simulation which has a great significance for improving the property of circuits. First of all, the operating principle of silicon microgyroscope is introduced. Secondly, a RLC series resonant circuit is established by measuring Q value and driving frequency. Then the overall simulation is conducted in Cadence combined with chips’ models offered by the manufacturers. Finally, the accuracy of simulation is verified by experiments. Experimental results show that, the relative error of driving sense signal’s value is 0.5%, for stability time the value is 0.6% and for driving frequency the value is 38ppm. Experimental results agree well with the simulation, which confirms simulation’s accuracy. This has a great significance for improving the property of circuits.

scholarly journals A Novel Traveling Wave Sandwich Piezoelectric Transducer With Single Phase Drive: Theoretical Modeling , Experimental Validation and Application Investigation

2020 ◽  
Author(s):  
Liang Wang ◽  
Fushi Bai ◽  
Viktor Hofmann ◽  
Jiamei Jin ◽  
Jens Twiefel
Keyword(s):  
Transfer Matrix ◽  
Piezoelectric Transducer ◽  
Traveling Wave ◽  
Single Phase ◽  
Longitudinal Vibration ◽  
Experimental Results ◽  
Sandwich Composite ◽  
Driving Frequency ◽  
Mobile System ◽  
Mean Velocity

Abstract Most of traditional traveling wave piezoelectric transducers are driven by two phase different excitation signals, leading to a complex control system and seriously limiting their applications in industry. To overcome these issues, a novel traveling wave sandwich piezoelectric transducer with a single-phase drive is proposed in this study. Traveling waves are produced in two driving rings of the transducer while the longitudinal vibration is excited in its sandwich composite beam, due to the coupling property of the combined structure. This results in the production of elliptical motions in the two driving rings to achieve the drive function. An analytical model is firstly developed using the transfer matrix method to analyze the dynamic behavior of the proposed transducer. Its vibration characteristics are measured and compared with computational results to validate the effectiveness of the proposed transfer matrix model. Besides, the driving concept of the transducer is investigated by computing the motion trajectory of surface points of the driving ring and the quality of traveling wave of the driving ring. Additionally, application example investigations on the driving effect of the proposed transducer are carried out by constructing and assembling a tracked mobile system. Experimental results indicated that 1) the assembled tracked mobile system moved in the driving frequency of 19410 Hz corresponding to its maximum mean velocity through frequency sensitivity experiments; 2) motion characteristic and traction performance measurements of the system prototype presented its maximum mean velocity with 59 mm/s and its maximum stalling traction force with 1.65 N, at the excitation voltage of 500 V RMS . These experimental results demonstrate the feasibility of the proposed traveling wave sandwich piezoelectric transducer.

scholarly journals Influence of the driving frequency and equivalent parameters on displacement amplitude of electrostatic linear comb actuator

2018 ◽  
Vol 40 (4) ◽  
pp. 397-306
Author(s):  
Hoang Trung Kien ◽  
Vu Cong Ham ◽  
Pham Hong Phuc
Keyword(s):  
Sine Wave ◽  
Displacement Amplitude ◽  
Damping Factor ◽  
Driving Voltage ◽  
Driving Frequency ◽  
Dynamic Parameters ◽  
Motion Direction ◽  
Amplitude Error ◽  
Differential Motion ◽  
Air Damping

A new method determining the equivalent dynamic parameters such as stiffness, vibrating mass, and air damping factor in motion direction of shuttle (i.e. in y-direction) is proposed, thence the differential motion equation of shuttle is established and solved to achieve a typical displacement formula. Simulation and experimental results show that the change of ELCA' displacement is inappreciable while the range of driving frequency up to 27 Hz (error of 10% with driving voltage is a square wave). Moreover, the range of driving frequency for the ELCA can be extended up to 1 kHz with displacement amplitude error of 10% while the shape of driving voltage is a harmonic sine wave.

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