Actuators Research Papers - Academia.edu (original) (raw)

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- Materials Science, Optics, Fiber Optics, Video
- by Duong Ho
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- Engineering, Computer Science, Algorithms, Information Retrieval
- by Fred Dickey
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- Engineering, Computer Science, Manufacturing, Statistical Analysis

هديكچ جارختـسا رد نملاك رتليف و يعاعش هياپ عباوت هكبش رب ينتبم راگزاس ياهشور ،هلاقم نيا رد ليسناتپ ليسـناتپ عيرـس جارختسا رد اهنآ دركلمع و هدش رورم هتخيگنارب ياه يياونـش هـتخيگنارب ياـه يم هسياقم دوش . هب يارب نينچمه ةصخشم دوب SNR ليسناتپ لدم رب ينتبم يشور ،هتخيگنارب ياه يزاـس يم هئارا نملاك رتليف بوچراچ رد هتخيگنارب لانگيس تبسن ار هتخيگنارب لانگيس جارختسا تقد هك دوش هب ،لبق ياهشور هب هظحلام لباق روط يم دوبهب يا دشخب . هيبش جياتن يزاس يم ناشن ياهـشور هـك دـنهد ليف و راگزاس نومزآ دادعت شهاك رد نملاك رت ليسـناتپ جارختـسا يارـب زاـين دروم ياه هـتخيگنارب ياـه هظحلام لباق توافت ،يياونش قـيقد جارختـسا ناـكما ،يداهنشـيپ شور و دنرادن يا ليسـناتپ هـنماد رـت نومزآ مك دادعت يارب ار هتخيگنارب يم مهارف اه دزاس .

- by Ali Heydari
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- Computer Science
- by Anh Minh Đỗ
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- Materials Science, Electrostatics, Optoelectronics, Actuators

Wireless sensor networks (WSNs) are now adopting mobile sensors due to their increased popularity in research and industry. To enhance WSNs' performance, mobility can be utilized to gather data. But, if the collector's route is fixed and movement is not manageable, current quality of service (QoS) strategies and protocols are ineffective in achieving timely data delivery while maintaining energy efficiency. In the real world, WSN networks use both actuator - actuator and sensor - actuator coordination. To conserve energy in communicati on tasks with heavy traffic and high volume, sensors/actuators can be relocated to desired locations. This study introduces a routing protocol that optimizes delivery latency and energy conservation in WSNs. The proposed latency, energy, and quality of ser vice aware (LEQA) protocol uses a cooperative approach to track the sink and coordinate communication between sensors and actuators. Each sensor schedules its time division multiple access (...

- by Dawit Hadush Hailu
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- Engineering, Electrical Engineering, Computer Science, Distributed Computing
- by Federico Thomas
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- Mathematics, Computer Science, Topology, Space Technology

In this study, an experimental investigation of separation control using a dielectric barrier discharge plasma actuator was performed on an NACA0015 airfoil over a wide range of Reynolds numbers, angles of attack, and nondimensional burst frequencies. The range of the Reynolds number was based on a chord length ranging from 2.52 × 105 to 1.008 × 106. A plasma actuator was installed at the leading edge and driven by AC voltage. Burst mode (duty-cycle) actuation was applied, with the nondimensional burst frequency ranging between 0.1–30. The control authority was evaluated using the time-averaged distribution of the pressure coefficient Cp and the calculated value of the lift coefficient Cl. The baseline flow fields were classified into three types: (1) leading-edge separation; (2) trailing-edge separation; and (3) the hysteresis between (1) and (2). The results of the actuated cases show that the control trends clearly depend on the differences in the separation conditions. In leadin...

- by Masayuki Anyoji
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- Materials Science, Mechanics, Actuators, Trailing edge noise
- by Francesco Durante
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- Engineering, Electrical Engineering, Chemical Engineering, Robotics
- by Tường Vy Lê Lam
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- Engineering, Materials Science, Carbon Nanotube, Nanotechnology
- by Yameen Hussain
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- Aerospace Engineering, Aerospace, Actuator

Physical interactions with socially assistive robots (SARs) positively affect user wellbeing. However, haptic experiences when touching a SAR are typically limited to perceiving the robot’s movements or shell texture, while other modalities that could enhance the touch experience with the robot, such as vibrotactile stimulation, are under-explored. In this exploratory qualitative study, we investigate the potential of enhancing human interaction with the PARO robot through vibrotactile heartbeats, with the goal to regulate subjective wellbeing during stressful situations. We conducted in-depth one-on-one interviews with 30 participants, who watched three horror movie clips alone, with PARO, and with a PARO that displayed a vibrotactile heartbeat. Our findings show that PARO’s presence and its interactive capabilities can help users regulate emotions through attentional redeployment from a stressor toward the robot. The vibrotactile heartbeat further reinforced PARO’s physical and social presence, enhancing the socio-emotional support provided by the robot and its perceived life-likeness. We discuss the impact of individual differences in user experience and implications for the future design of life-like vibrotactile stimulation for SARs.

- by Frank Slomka
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- Engineering, Computer Science, Architecture, Automotive Industry

This paper considers a three-dimensional micropump based on a piezoelectric actuator. COMSOL software version 6.5 is used to simulate the performance of the micropump. At first, a reference micropump is defined, which works at a frequency of 60 Hz and a voltage of 1500 V that is capable of pumping a maximum flow rate of 0.038 ml/s. The influence of frequency, voltage, the axial position of input and output of micropump, dimensions of piezoelectric actuator and membrane, and shape of the actuator on the fluid output flow rate and pumped fluid volume is investigated. The results demonstrate that the frequency, voltage, dimensions of the piezoelectric actuator and the membrane has a direct effect on the output flow rate and the pumped fluid volume so that the output flow rate of the fluid and the volume of the pumped fluid increase with the increase of these parameters. For example, the output flow rate of the micropump at 100 and 20 Hz frequency is 0.065 and 0.011 ml/s, respectively. By increasing the voltage from 1500 to 1875 V, the micropump output flow rate increases to 0.047 ml/s. The results show that the rectangular piezoelectric actuator has a lower efficiency than the circular one.

- by Vijaya S Chellaboina
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- Aerospace Engineering, Mathematics, Computer Science, Control Theory
- by Vijaya S Chellaboina
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- Engineering, Mathematics, Applied Mathematics, Computer Science
- by Mark Glauser
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- Physics, Flow Control, Aeroacoustics, Computational Aeroacoustics
- by Mark Glauser
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- Geology, Flow Control, Closed Loop Control, Wind Tunnel
- by Mark Glauser
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- Geology, Turbulence, Control system, Feedback Control
- by Mark Glauser
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- Physics

Shack Hartmann Wavefront Sensor (SHWS) device is most commonly used in Adaptive Optics Systems. However, the same device can also be effectively used as an optical metrology instrument to characterize any optical system made of lenses or mirrors. To get acquainted with SMT, a prototype segment mirror telescope (PSMT) is being designed and developed at Indian Institute of Astrophysics (I.I.A) Bangalore. The proposed prototype telescope will use seven hexagonal mirrors, which will be supported by simple mirror support assembly and driven by developed voice coil based indigenous actuators. The PSMT mirror segments are planned to be manufactured in IIA optics fabrication facility. One of the stringent requirement associated with the PSMT mirror segments is that they should have almost matching ROC and any relative departure in the ROC by few hundred micron will results in substantial degradation in the telescope image quality. During the optics manufacturing process, the relative ROC of mirror segments need be measured precisely and then after any departure from required ROC has to be corrected at the manufacturing stage itself. After exploring various options to measure ROC, the PSMT engineering team has come up with an approach which uses SHWS. Since SHWS needed for the optics metrology has got specific requirements and therefore any commercially available SH may not serve the purpose. Therefore, we have been attempting to develop a customized SHWS which can be used to test PSMT mirror segments. As a first step we have designed the optics of the instrument using ZEMAX, then after mechanical structure and the control. We also developed necessary software to control the instrument as well as data analysis software. In this poster, we present the Opto-mechanical design and the Instrument control system of the instrument.

- by Jayanth S Narasimha
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- Optics, Imaging Science, Telescope Making, Wavefront Sensors

Rock breaking using a top hammer drill is achieved with a combination of four distinct hydraulically driven functions; percussion, feed, rotation and flushing the hole. Percussion, feed and rotation are applied to the drill string outside the drill hole. Flushing water or another flushing medium is pumped through the drill string to the bit. Controlling top hammer drill rigs in varying rock conditions is an important task, as non-optimal control can damage drilling equipment and waste energy. Damage occur especially when percussion-induced stress waves are not optimally transmitted to the rock and are thus reflected from the drill bit–rock interface to the drill. Therefore, to design an adaptive control system to manage drilling in all rock conditions, it is meaningful to develop a simulator that can produce data comparable to real-life drilling. This paper presents a rock drill simulator designed in MATLAB/Simulink environment. The rock drill model has hydraulic feed and rotation c...

- by Suvi Peltokangas
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- Mechanical Engineering

This work aims to develop a classification model for drives actuators features depending on their feature. The proposed model consists of nine levels that include the most common actuators, which in turn will facilitate easy identification of relationships and ease of finding alternatives. On the basis of the proposed classification, an information model of actuator alternatives has been created, which reflects key information about them. The created model will provide an opportunity to reduce the design time of the actuators.

Basic dynamic characteristics of a 1:12 scaled experimental model of a 4 stories 3-D steel frame are obtained using different methods. The frequency sweep method is used to calculate the modal damping ratio and mode shapes of the frame. The optimal values of the TMD different parameters are evaluated using try and error method. Then the associated TMD system is constructed and installed on the top story andthe model is tested under support harmonic excitation.The experimentally measured results of the model frame under resonant harmonic support excitationshow the significant effectiveness of the proposed TMD system in reducing the model frame response.The above model is also analytically examined under 23 world-wide earthquake accelerogrames with different level of frequency content.

This study investigates the higher harmonic generation of the Lamb wave at a delamination due to contact acoustic nonlinearity, which is a clapping phenomenon between sublaminate surfaces due to the Lamb wave interaction with the delamination. In this study, higher harmonics of the Lamb wave induced at the delamination in composite laminates are studied in detail. This study performs both numerical and experimental studies. A three-dimensional finite element model is proposed for predicting the propagation of nonlinear Lamb waves in composite laminates and is verified using experimentally measured data. The results show the proposed numerical model can reasonably predict higher harmonic generated by contact acoustic nonlinearity. It is found that the delamination is the major source of contact acoustic nonlinearity in the composite laminates. A mode conversion study is also carried out to gain further physical insight into the higher harmonic generation of the Lamb wave at the delamination.

This paper addresses the concept of partial stabilization for driftless control systems called "nonholonomic systems". We introduce a class of feedback transformations that transforms our system in to a multi-chained triangular form. We show that we can bounded the first component; this can be done by using a smooth feedback control depending on the state. In addition the (n − 1) other components will be stabilized asymptotically. In first step this approach is applied to unicycle system and in second step it is generalized to nonholonomic systems with m controls .

- by Henri Bourlès
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- Engineering, Computer Science, Control Theory, Control Systems
- by mekki ksouri
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- Control Systems Engineering, Computer Science, Hybrid Systems, Sensor
- by hung hung
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- Engineering, Electronic Engineering, High Frequency, Actuators
- by Hector Eduardo Roman
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- Materials Science, Actuators, DIELECTRIC, Plasma
- by Vijay Varadan
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- Engineering, Computer Science, Proceedings, Sensors

This study investigates the vibration reduction of tall wind-excited buildings using a tuned mass damper (TMD) with an inerter (TMDI). The performance of the TMDI is computed as a function of the floor to which the inerter is grounded as this parameter strongly influences the vibration reduction of the building and for the case when the inerter is grounded to the earth whereby the absolute acceleration of the corresponding inerter terminal is zero. Simulations are made for broadband and harmonic excitations of the first three bending modes, and the conventional TMD is used as a benchmark. It is found that the inerter performs best when grounded to the earth because, then, the inerter force is in proportion to the absolute acceleration of only the pendulum mass, but not to the relative acceleration of the two inerter terminals, which is demonstrated by the mass matrix. However, if the inerter is grounded to a floor below the pendulum mass, the TMDI only outperforms the TMD if the ine...

- by Felix Weber
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- Physics, Vibration, Actuators, Acceleration
- by Vicenç Puig
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- Engineering, Computer Science, Fault Tolerant Systems, Stability
- by Vicenç Puig
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- Mathematics, Set Theory, Computer Science, Fault Tolerant Computing
- by Athmane BOUZIDI
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- Engineering, Electrical Engineering, Mechanical Engineering, Mathematics

Surge and rotating stall phenomena are two dynamic instabilities that occur in both axial and centrifugal compressors. Surge is the stream instability phenomenon in compressor that imposes severe damages to the compressors. Nowadays, suppressing surge phenomenon is one of the most important issues in oil and gas industries, especially when flow reduction or gas reflux is considered. This research seeks to extract the required technical information about control lines, surge lines, and to present a new combined method to determine the performance curve of 6 rows of gas compressors in Asmari Kupal gas pressure boost station (National Iranian South Oil Company) made in Germany by MAN BORSIG Company, and to design a smart controller in order to increase the reliability of the control system and improve the machine performance. Finally, the system performance validity is shown by simulating a surge characteristic curve and implementing two points of the compressor operation condition.

- by karim salahshoor
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- Engineering, Axial Compressor, Centrifugal Compressor, Surge

In recent years human-machine interaction attracts scientific community attention because of human quality and health issues. Driver seat should be designed so that it would ensure occupational health as well as increase work efficiency.... more

- by karim salahshoor
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- Engineering, Mechanism in Biology

In recent years, active material driven actuators have been widely researched for potential applications in the fields of aerospace, automotive, and civil engineering. While most of these active materials, such as piezoelectric, magnetostrictive, and electrostrictive materials, have high force and bandwidth capabilities, they are limited in stroke. In combination with hydraulic systems, the field-dependent motion of these materials can be amplified to produce high force, high stroke actuators. In a hybrid hydraulic pump, the motion of an active material is used to pressurize a hydraulic fluid. Since the properties of active materials vary greatly in terms of free strain and block force, there is a need to identify the optimum active material for a particular application. This study compares four active materials, Lead—Zirconate—Titanate (PZT), Lead—Magnesium—Niobate (PMN), Terfenol-D and Galfenol, as the drivers of a hybrid hydraulic actuation system. The performance of each of thes...

- by Jayant Sirohi
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- Engineering, Civil Engineering, Materials Science, Stress

This paper characterizes the static, dynamic, and controlled behavior of a high-performance electro-hydraulic actuator to assess its suitability for use in evaluating machine tool behavior. The actuator consists of a double-acting piston and cylinder arrangement controlled by a servo valve and a separate rear chamber controlled by a separate valve, designed to work in conjunction to generate static forces of up to 7000 N that can be superposed with dynamic forces of up to ±1500 N. This superposition of periodic forces with a non-zero mean makes the actuator capable of applying realistic loading conditions like those experienced by machines during cutting processes. To characterize the performance of this actuator, linearized static and dynamic models are described. Since experiments with the actuator exhibit nonlinear characteristics, the linearized static model is expanded to include the influence of nonlinearities due to flow, leakages, saturations, and due to friction and hystere...

- by Govind Narayan Sahu
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- Computer Science, Nonlinear dynamics, CNC Machine tools, Actuators
- by Keith Hekman
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- Engineering, Mechanical Engineering, Vibrations, Vibration Control
- by Alastair MacDowell
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- by tú Dương thanh
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- Engineering, Mechanical Engineering, Applied Mathematics, Actuators

The design and implementation of a piezoelectric energy-harvesting system, aimed at stimulating the Tibialis anterior muscle to aid patients struggling with a foot drop disability, are investigated. A physical prototype designed to be installed inside a shoe sole, consisting of an energy-harvesting unit along with a power-management circuit and a functional electrical-stimulation circuit, is fabricated. The piezoelectric energy harvester (PEH) incorporated six layers of Polyvinylidene-Fluoride sheets to achieve a mean-charge generation of 65.25 μC/step and a peak power of 10.76 mW/step. A peak voltage of +80.0 V generation was achieved during a stomping motion. The electrical systems store, convert, and deploy 60 mA electric pulses at the desired frequencies to the target muscle. The finalized prototype is best-suited to prolong the duration of the charged batteries whilst in use. In a practical sense, it should be used alongside external-power sources to recharge the batteries inst...

- by Ganga Poudel
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- Functional Electrical Stimulation, Energy Harvesting, Actuators, Piezoelectricity

The fuller die, which is used for elongated components, is a type of perform die employed in the closed-die forging process. In this research, using the finite-element method and the model test technique, both the required load and material flow are studied for the four-blow fullering operation. The experiments are conducted using lead as the model material and steel tools. Comparison of the numerical predictions and experimental results show a good agreement between them. For the extension of various process variables, FEM simulations are performed using ANSYS commercial software. Then, by means of linear regression and based on the finite-element results, some useful relationships are proposed for prediction of elongation, sideways spread and the required load for the four-blow fullering process. The designers can use the results of this investigation for prediction of elongation, sideways spread and fullering load instead of time consuming and expensive experiments.

Various methods for parametric interpolation of NURBS curves have been proposed in the past. However, the errors caused by the approximate nature of the NURBS interpolator were rarely taken into account. This paper proposes an integrated look-ahead algorithm for parametric interpolation along NURBS curves. The algorithm interpolates the sharp corners on the curve with the Pythagorean-hodograph (PH) interpolation. This will minimize the geometric and interpolator approximation errors simultaneously. The algorithm consists of four different modules: a sharp corner detection module, a PH construction module, a feedrate planning module, and a dynamics module. Simulations are performed to show correctness of the proposed algorithm. Experiments on an X-Y table confirm that the developed method improves contour accuracy significantly compared to previously proposed adaptive-feedrate and curvature-feedrate algorithms.

Vibration cutting (VC), elliptical vibration cutting (EVC) and ordinary cutting (OC) of In738 work-pieces have been experimentally investigated in the present research. The experiments were carried out by using single crystal diamond tool and ultra-precision CNC lathe. Vibration frequency is 36.16KHz and the amplitude is . The influence of various cutting parameters including cutting speed, feed-rate, vibration amplitude and phase angle on the cutting force, surface roughness and tool life have been studied and the results have been compared. The results indicate that the cutting force in EVC is much less than the two other processes. The surface roughness in both the cutting and feed directions was also less than those in other processes.

- by John Stankovic
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- Computer Science, Distributed Computing, Biomedical Engineering, Embedded Systems
- by Ravi Shenoy
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- Engineering, Aerospace Engineering, Materials Science, Microstructure

Yoo and Okjoo Oh. I also dedicate this work to my beautiful wife, Eunjoo and my lovely sweet daughter, Gina. Acknowledgments I am very grateful to my supervisor, Prof. Delbert Tesar, for his continuous guidance and support throughout my graduate studies. He always encouraged me to accomplish my work to be an outstanding job and gave me the motivation to build the nonlinear test bed with a full support. Thanks to his deepest concerns and advices, I could have finished a successful research topic. Also, I would like to thank Dr. Chetan Kapoor and Dr. Mitch Pryor of the Robotics Research Group for our discussions that have been very useful throughout this work. I thank many of the colleagues in the Robotics Research Group in the University of Texas at Austin for having their time with me to discuss a various of engineering topics. I would like to express my deep gratitude to Prof. Melba Crawford of the

- by Chetan Kapoor
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- Bed