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338 results on '"Actuators -- Analysis"'

1. AXISYMMETRIC RESONANT VIBRATIONS AND VIBRATION HEATING OF AN INELASTIC CYLINDRICAL SHELL COMPLIANT TO SHEAR WITH PIEZOELECTRIC ACTUATORS AND RIGIDLY FIXED END FACES

Author

Kyrychok, I.F., Zhuk, Ya.O., Chernyushok, O.A., and Tarasov, A.P.

Subjects
Actuators -- Analysis, Mathematics
Abstract

We consider the problem of axisymmetric resonance vibrations of an inelastic cylindrical shell compliant to shear with piezoelectric actuators under the action of electromechanical monoharmonic loading. We take into account transverse shear strains, rotation inertia of a normal element, and temperature dependence of complex modules of piezopassive and piezoactive materials. The nonlinear problem is solved by using the iterative approach with respect to time within the framework of which the system of ordinary differential equations for vibrations is reduced to the integration of nonstationary heat-conduction equation by the finite-difference method. By using piezoelectric actuators, we analyze the influence of shear strains and the temperature of vibration heating on the amplitude and temperature-frequency characteristics and active damping of the resonance vibrations of the shell. Keywords: resonance vibrations, dissipative heating, cylindrical shell, piezoactuator, shear strains., Introduction In the contemporary engineering, for the purposes of damping of forced vibrations of thin-walled structural elements, parallel with passive methods, it is also customary to use the methods of [...]

Published
2023
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3. Supply of Gasket for Sc/v, 320 Actuator, Gasket for Cep Minimum, Recirculation, Valve Actuator, with Actuator, Type: Sc/v, Size:, 320 Mm, Stroke: 80 Mm, Id, No: A0910428, Make: Hora, 3, 2, Actuator Stem, Pa-n300: Id, No:116923 for, Actuator Model, No:pa-n

Subjects
Actuators -- Analysis, Business, international
Abstract

Tenders are invited for Supply of Gasket for Sc/v, 320 Actuator, Gasket for Cep Minimum, Recirculation, Valve Actuator, with Actuator, Type: Sc/v, Size:, 320 Mm, Stroke: 80 Mm, Id, No: [...]

Published
2024

4. Supply Of 50 Nb Pneumatic Diaphragm Valve, 80 Nb Pneumatic Diaphragm Valve, Spare Diaphragm Actuator Seal Kit For 50 Nb Diaphragm Valve, Spare Diaphragms Actuator Seal Kit For 80 Nb Diaphragm Valve, Seismic Analysis Charges - Pneumatic Diaphragm Valve Wit

Subjects
Nuclear Power Corporation of India Ltd., Nuclear energy -- Analysis, Electric utilities -- Analysis, Actuators -- Analysis, Business, international
Abstract

Tenders are invited for Supply of 50 Nb Pneumatic Diaphragm Valve, 80 Nb Pneumatic Diaphragm Valve, Spare Diaphragm Actuator Seal Kit for 50 Nb Diaphragm Valve, Spare Diaphragms Actuator Seal [...]

Published
2023

5. Repairing And Fitting Of One No Rotary Actuator Complete Set For The Udm Machine Make Eimco Elicon Model No 611 -157 At Shankarpur Colliery Under Bankola Area

Subjects
Eastern Coalfields Ltd., Actuators -- Analysis, Mineral industry -- Analysis, Mining industry -- Analysis, Business, international
Abstract

Tenders are invited for Repairing and fitting of one no rotary actuator complete set for the UDM machine make Eimco Elicon model no 611 -157 at Shankarpur Colliery under Bankola [...]

Published
2023

7. Supply of Rotork Complete Actuator Model No: IQM10-F10-B4, Speed: 24RPM, Torque: 34|17Nm, Motor Rating: 0 10 KW (Q3), Rotork Complete Actuator Model No: IQT1000-F14-1-Mark-III Travel time: 30-120Sec, Speed: 24RPM, Tq-1000Nm (Q3), Rotork Gears Type:

Subjects
Damodar Valley Corp., Electric utilities -- Analysis, Actuators -- Analysis, Business, international
Abstract

Tenders are invited for Supply of Rotork Complete Actuator Model No: IQM10-F10-B4, Speed: 24RPM, Torque: 34/17Nm, Motor Rating: 0 10 KW (Q3), Rotork Complete Actuator Model No: IQT1000-F14-1-Mark-III Travel time: [...]

Published
2023

8. Supply of Spare Actuator Diaphram for Rk Controls Make Control Valve with Serial No - 03040213 Spare Actuator Diaphragm for Rk Controls Make Control Valve with Serial No-03040212 Spare Actuator Diaphragm for Rk Controls Make Control Valve Serial No-030402

Subjects
Actuators -- Analysis, Business, international
Abstract

Tenders are invited for Supply of Spare Actuator Diaphram for Rk Controls Make Control Valve with Serial No - 03040213 Spare Actuator Diaphragm for Rk Controls Make Control Valve with [...]

Published
2023

9. Supply of overhauling kit suitable for rotex magnet valve overhauling kit suitable for rotex magnet valve to model no. ulp-sv5 v02 consisting of 08 items.(for hhp locomotives). 1) manual actuator to pt. no. 01 no. 2) m.a.o. ring to pt. no. 22 - 01 no. 3)

Subjects
Actuators -- Analysis, Locomotives -- Analysis, Business, international
Abstract

Tenders are invited for Supply of overhauling kit suitable for rotex magnet valve overhauling kit suitable for rotex magnet valve to model no. ulp-sv5 v02 consisting of 08 items.(for hhp [...]

Published
2023

10. Supply Of Spare Actuator Diaphram For Rk Controls Make Control Valve With Serial No - 03040213 Spare Actuator Diaphragm For Rk Controls Make Control Valve With Serial No-03040212 Spare Actuator Diaphragm For Rk Controls Make Control Valve Serial No-030402

Subjects
Actuators -- Analysis, Business, international
Abstract

Tenders are invited for Supply of Spare Actuator Diaphram for Rk Controls Make Control Valve with Serial No - 03040213 Spare Actuator Diaphragm for Rk Controls Make Control Valve with [...]

Published
2023

11. Supply Of Diaphragm For Actuator, Model-sk-a-10-166087-a, Part No- V185989 (q3), Pneumatic Diaphragm For Diaphragm Actuated Valve - 160 L Sq Inch, Model- 6(150mm), Cl2500, Wcb, Bw, (q3), Actuator Stem Clamp, Part No- V340535, Part No - V340535 (q3)

Subjects
Damodar Valley Corp., Electric utilities -- Analysis, Actuators -- Analysis, Business, international
Abstract

Tenders are invited for Supply of Diaphragm for Actuator, Model-SK-A-10-166087-A, Part no- V185989 (Q3), Pneumatic Diaphragm for Diaphragm actuated valve - 160 L Sq Inch, Model- 6(150mm), CL2500, WCB, BW, [...]

Published
2023

12. Supply Of Procurement Of Overhauling Kit Suitable For Rotex Magne Overhauling Kit Suitable For Rotex Magnet Valve To Model No. Ulp-sv5 V02 Consisting Of 08 Items(for Hhp Locomotives). 1) Manual Actuator To Part No : 08 - 01no. 2) M.a.o Ring To Part

Subjects
Purchasing -- Analysis, Actuators -- Analysis, Locomotives -- Analysis, Business, international
Abstract

Tenders are invited for Supply of procurement of overhauling kit suitable for rotex magne overhauling kit suitable for rotex magnet valve to model no. ulp-sv5 v02 consisting of 08 items(for [...]

Published
2023

13. Supply Of Rotex Magnet Valve 3 Way Nc 10 Type With Manifold Model 3038c, Rotex Drg. No. 081-055-02-cworking Pressure Of Air 2-10 Kg|cm2, Coil Size Iii Railway Stud Type 110 Volt Dc, 3|8 Inch Bsp (f) Thread Pipeconnection With Manual Actuator, Body Materia

Subjects
Actuators -- Analysis, Railroads -- Analysis, Business, international
Abstract

Tenders are invited for Supply of Rotex Magnet Valve 3 Way Nc 10 Type With Manifold Model 3038C, Rotex Drg. No. 081-055-02-Cworking Pressure Of Air 2-10 Kg/Cm2, Coil Size Iii [...]

Published
2023

14. Actuator - Brake Valve, 85 Psi, Bendix Model Bva-85

Subjects
Actuators -- Analysis, Business, international
Abstract

Tenders are invited for ACTUATOR - BRAKE VALVE, 85 PSI, BENDIX MODEL BVA-85 Major organization : METRO Address : 9th Floor, One Gateway Plaza, Los Angeles, CA 90012 Country :United [...]

Published
2023

16. Supply Of Spare Kit For Positioner Model Cl2, Slide Pilot Valve For Class 2 Positioner, Pilot Valve Stem For Class 3 Positioner, Seal Kit For Power Cylinder Of Seal Air Damper, Seal Kit For Power Cylinder C0816, Seal Kit For C1216 Actuator, Positioner Cl-

Subjects
Actuators -- Analysis, Business, international
Abstract

Tenders are invited for Supply of spare kit for positioner model cl2, slide pilot valve for class 2 positioner, pilot valve stem for class 3 positioner, seal kit for power [...]

Published
2023

17. Supply Of Actuator Diaphragm For Mil Make Cv Model No 38-211x5, Valve Sl No 250395 (q3), Actuator Diaphragm For Mil Make Cv Model No 38-41118, Valve Sl No 252175, (q3), Actuator Diaphragm For Mil Make Cv Model No 37-411x1, Valve Sl No 250031, (q3), Actuat

Subjects
Nuclear Power Corporation of India Ltd., Nuclear energy -- Analysis, Actuators -- Analysis, Business, international
Abstract

Tenders are invited for supply of actuator diaphragm for mil make cv model no 38-211x5, valve sl no 250395 (q3), actuator diaphragm for mil make cv model no 38-41118, valve [...]

Published
2023

18. Supply Of Overhauling Kit For Horn Magnet Valve Model No. 31133-10 For Hhp Locos. Make-rotex (kitconsisting Of 1) Mannual Actuator Part No. 08-01 No. 2) Mannual Actuator Spring Pat No. 17-01 No. 3) Piston Oring Part No. 18-01 No. 4) Seat O Ring Part No. 1

Subjects
Actuators -- Analysis, Business, international
Abstract

Tenders are invited for Supply of Overhauling kit for horn magnet valve model no. 31133-10 for hhp locos. make-rotex (kitconsisting of 1) mannual actuator part no. 08-01 no. 2) mannual [...]

Published
2023

20. Supply Of Over Hauling Kit For Sander Control Valve For Wdg 4 Locomotives To Rotex Model No 21114-10sb-3g Consisting Of 11 Items: 1) Manual Actuator(push Button) Pt No 08 Qty -01 2)m A Spring Ptno17 Qty-01 3)piston O Ring Pt No 18 Qty -01 4)seat O Ring Pt

Subjects
Actuators -- Analysis, Locomotives -- Analysis, Business, international
Abstract

Tenders are invited for Supply of Over hauling kit for sander control valve for wdg 4 locomotives to rotex model no 21114-10sb-3g consisting of 11 items: 1) manual actuator(push button) [...]

Published
2023

21. Hassan First University of Settat Researchers Advance Knowledge in Science (Finite element analysis for fatigue phenomena in mechatronic shape memory alloy actuator)

Subjects
Actuators -- Analysis, Fatigue testing machines -- Analysis, Shape-memory alloys -- Analysis, Finite element method -- Analysis, Materials -- Fatigue, Health, Science and technology
Abstract

2023 JUL 14 (NewsRx) -- By a News Reporter-Staff News Editor at Science Letter -- Data detailed on science have been presented. According to news reporting from Hassan First University [...]

Published
2023

23. Supply Of 50 Nb Pneumatic Diaphragm Valve, 80 Nb Pneumatic Diaphragm Valve, Spare Diaphragm Actuator Seal Kit For 50 Nb Diaphragm Valve, Spare Diaphragms Actuator Seal Kit For 80 Nb Diaphragm Valve, Seismic Analysis Charges - Pneumatic Diaphragm Valve Wit

Subjects
Nuclear Power Corporation of India Ltd., Nuclear energy -- Analysis, Electric utilities -- Analysis, Actuators -- Analysis, Business, international
Abstract

Tenders are invited for Supply of 50 nb pneumatic diaphragm valve, 80 nb pneumatic diaphragm valve, spare diaphragm actuator seal kit for 50 nb diaphragm valve, spare diaphragms actuator seal [...]

Published
2023

24. Supply Of Overhauling Kit Suitable For Rotex Magnet Valve. Overhauling Kit Suitable For Rotex Magnet Valve To Model No. Ulp-sv5 V02 Consisting Of 08 Items.(for Hhp Locomotives). 1) Manual Actuator To Pt. No. 01 No. 2) M.a.o. Ring To Pt. No. 22 - 01

Subjects
Actuators -- Analysis, Locomotives -- Analysis, Business, international
Abstract

Tenders are invited for Supply of overhauling kit suitable for rotex magnet valve. overhauling kit suitable for rotex magnet valve to model no. ulp-sv5 v02 consisting of 08 items.(for hhp [...]

Published
2023

25. Supply Of Complete Bevel Gear Type Actuator, Assembly, Type Ba-1, Make Limitorque, India Ltd., Limitorque Make Valve Actuator Model Ba-1, Bevel Gear, Part No. # 1, Limitorque Make Valve Actuator Model Ba-1, Drive Sleeve, Part No. # 4, Limitorque Make Valv

Subjects
Actuators -- Analysis, Business, international
Abstract

Tenders are invited for Supply of complete bevel gear type actuator, assembly, type ba-1, make limitorque, india ltd., limitorque make valve actuator model ba-1, bevel gear, part no. # 1, [...]

Published
2023

26. Repairing And Fitting Of One No Rotary Actuator Complete Set For The Udm Machine Make Eimco Elicon Model No 611-201 At Shyamsundarpur Colliery Under Bankola Area

Subjects
Eastern Coalfields Ltd., Actuators -- Analysis, Mineral industry -- Analysis, Mining industry -- Analysis, Business, international
Abstract

Tenders are invited for Repairing and fitting of One No rotary actuator complete set for the UDM machine make EIMCO ELICON model no 611-201 at Shyamsundarpur colliery under Bankola Area. [...]

Published
2023

27. Procurement Of Rotork Make Mov Actuator Spares At Iocl Refinery Yoke Assy.model No.k600f14e|96rpm,rotork, Clutch Ring,model No.k600f14e|96rpm, Clutch Ring Type K800g3a Make Rotork, Worm Wheel Assy Mov,type: K150f10e, Worm Wheel&worm Shaft,k600g1g2a|96

Subjects
Purchasing -- Analysis, Actuators -- Analysis, Business, international
Abstract

Tenders are invited for Procurement of rotork make mov actuator spares at iocl refinery yoke assy.model no.k600f14e/96rpm,rotork, clutch ring,model no.k600f14e/96rpm, clutch ring type k800g3a make rotork, worm wheel assy mov,type: [...]

Published
2023

28. Procurement Of Spares For Lp Bypass Valves For Mtps, Soft Goods Kit Na 60 700 Model, Spacer, Actuator Soft Goods Kit, Bypass Control Valve Actuator, Valve Soft Goods Kit Model 840 H Part No 202447 2 Ch Soft Drg Item 8 9 10 13, Actuator Soft Goods Kit Mode

Subjects
Damodar Valley Corp., Purchasing -- Analysis, Actuators -- Analysis, Business, international
Abstract

Tenders are invited for Procurement of spares for lp bypass valves for mtps, soft goods kit na 60 700 model, spacer, actuator soft goods kit, bypass control valve actuator, valve [...]

Published
2023

29. Supply Of Spares Of Neles Make Control Vlv,ball,ctrl,a217,ss316,stel,rf,4in,600, C|v Valve Body|studs & Nuts,model:2 In, Vlv On|off,10 Dm150fddbb7100xtddo-exxx, Actuator For Rotary Vlv,model:qpx3c|mc, Positioner, Mounting Set M-l-l1l200|25-f10 H0234

Subjects
Indian Oil Corporation Ltd., Actuators -- Analysis, Petroleum services industry -- Analysis, Business, international
Abstract

Tenders are invited for Supply of spares of neles make control vlv,ball,ctrl,a217,ss316,stel,rf,4in,600, c/v valve body/studs & nuts,model:2 in, vlv on/off,10 dm150fddbb7100xtddo-exxx, actuator for rotary vlv,model:qpx3c/mc, positioner, mounting set m-l-l1l200/25-f10 h023415 [...]

Published
2023

30. Investigators at Kaunas University of Technology Detail Findings in Mechanical Science [Actuation Performance of Macro Fibre Composite (Mfc) As Actuator In Vibration Reduction of Cantilever Beams]

Subjects
Actuators -- Analysis, Technical institutes -- Analysis, Health, Science and technology
Abstract

2023 JUN 23 (NewsRx) -- By a News Reporter-Staff News Editor at Science Letter -- Data detailed on Science - Mechanical Science have been presented. According to news originating from [...]

Published
2023

32. Supply Of Cylinder Actuator For Plate Valve For Mill Rejection System, Type Double Acting Pneumatic Metallic Cylinder, Model :ccmc-6, Seal Kits Of Power Cylinder. Qty : 22

Subjects
Damodar Valley Corp., Electric utilities -- Analysis, Actuators -- Analysis, Business, international
Abstract

Tenders are invited for Supply of Cylinder actuator for plate valve for mill rejection system, type double acting pneumatic metallic cylinder, model :ccmc-6, Seal kits of Power cylinder. Qty : [...]

Published
2022

33. Supply Of Various Sizes Of Beacon Actuators As Per Technical Specification 3 Items 'beacon Rotork K-60 Actuator, Wiring Diagram: 2529, Output Speed-24 Rpm, Max Torque Setting-61 Nm, Motor:0.18 Kw, 415v 3ph 50hz. Technical Specn. 1) Actuator Model : K60f10

Subjects
Actuators -- Analysis, Business, international, Group of Eight
Abstract

Tenders are invited for Supply of various sizes of beacon actuators as per technical specification 3 items 'beacon rotork k-60 actuator, wiring diagram: 2529, output speed-24 rpm, max torque setting-61 [...]

Published
2022

34. Supply Of Seal Kit For Actuator Of Model Drc 80 , Seal Kit For Actuator Of Model Drc 125 , Seal Kit For Actuator Of Model Drc 150 , Seal Kit For Actuator Of Model Number Mentioned In Item Description Field , Complete Actuator Assembly Of Actuator Model Dr

Subjects
Nuclear energy -- Analysis, Actuators -- Analysis, Business, international
Abstract

Tenders are invited for Supply of seal kit for actuator of model drc 80 , seal kit for actuator of model drc 125 , seal kit for actuator of model [...]

Published
2022

35. Supply Of New Actuator For Replacement Of Existing Rotork Actuator Model 90af30z (q3), Extended Drive Assembly Of Valve For Stem Extension Upto 1 Meter Length (q3)

Subjects
Indian Oil Corporation Ltd., Actuators -- Analysis, Petroleum services industry -- Analysis, Business, international
Abstract

Tenders are invited for Supply of new actuator for replacement of existing rotork actuator model 90af30z (q3), extended drive assembly of valve for stem extension upto 1 meter length (q3) [...]

Published
2022

36. Supply Of Set Of Air Filter, Service Kit, Coupling, Actuator, Regulator, Valve, Transmitter. Set Of Air Filter, Service Kit, Coupling, Actuator, Regulator, Valve, Transmitter, Sensor, As Per Listsattached For Repairing Of Compressor Make Elgi Model

Subjects
Communications equipment -- Analysis, Actuators -- Analysis, Cellular transmission equipment, Telecommunications equipment, Business, international
Abstract

Tenders are invited for Supply of set of air filter, service kit, coupling, actuator, regulator, valve, transmitter. set of air filter, service kit, coupling, actuator, regulator, valve, transmitter, sensor, as [...]

Published
2022

37. Research from Jiangsu University of Science and Technology Has Provided New Study Findings on Electronics (Loss analysis of a novel compound electromagnetic linear actuator under different operating modes and working conditions)

Subjects
Actuators -- Analysis, Electromagnetism -- Analysis, Electronics
Abstract

2023 MAR 7 (VerticalNews) -- By a News Reporter-Staff News Editor at Electronics Newsweekly -- Data detailed on electronics have been presented. According to news originating from Jiangsu University of [...]

Published
2023

38. Reports from Harbin Institute of Technology Provide New Insights into Information Technology (Sensing Data-based Degradation Estimation of Electromechanical Actuator Under Dynamic Operating Conditions)

Subjects
Control systems -- Analysis, Actuators -- Analysis, Sensors -- Analysis, Computers
Abstract

2022 DEC 13 (VerticalNews) -- By a News Reporter-Staff News Editor at Information Technology Newsweekly -- Current study results on Information Technology have been published. According to news originating from [...]

Published
2022

39. Studies in the Area of Brain Injury Reported from University of Auckland (Analyzing pericytes under mild traumatic brain injury using 3D cultures and dielectric elastomer actuators)

Subjects
Brain research -- Analysis, Brain damage -- Analysis, Brain -- Analysis -- Injuries, Actuators -- Analysis, Elastomers -- Analysis, Health, University of Auckland
Abstract

2022 DEC 2 (NewsRx) -- By a News Reporter-Staff News Editor at Health & Medicine Week -- Fresh data on brain injury are presented in a new report. According to [...]

Published
2022

40. Influence of Additives on the Properties of Casting Nafion Membranes and SO-Based Ionic Polymer-Metal Composite Actuators

Author

Wang, Yanjie, Chen, Hualing, Wang, Yongquan, Luo, Bin, Chang, Longfei, Zhu, Zicai, and Li, Bo

Subjects
El Al Israel Airlines Ltd., Ethylene glycol -- Analysis, Metal castings industry -- Analysis, Actuators -- Analysis, Fluorine compounds -- Analysis, Dimethylformamide -- Analysis, Polymers -- Analysis, Airlines -- Analysis, Engineering and manufacturing industries, Science and technology
Abstract

As a typical smart material, ionic polymer metal composite (IPMC) has a sandwich structure, which consists of a base membrane and two thin metallic electrodes on both sides of the [...]

Published
2014

41. New Chemical Sensors and Actuators Data Have Been Reported by Investigators at Isfahan University of Medical Sciences (One-step wettability patterning of PDMS microchannels for generation of monodisperse alginate microbeads by in Situ external ...)

Subjects
Drug delivery systems -- Analysis, Physical fitness -- Analysis, Sensors -- Analysis, Actuators -- Analysis, Microfluidics -- Analysis, Biochemistry, Obesity, Chemical research, Control equipment, Editors, Health
Abstract

2019 JUL 20 (NewsRx) -- By a News Reporter-Staff News Editor at Obesity, Fitness & Wellness Week -- New research on Chemical Research - Chemical Sensors and Actuators is the [...]

Published
2019

42. Studies from Kwangwoon University in the Area of Chemical Sensors and Actuators Described (High-ionic-strength Pre-concentration Via Ion Concentration Polarization for Blood-based Biofluids)

Subjects
Physical fitness -- Analysis, Actuators -- Analysis, Sensors -- Analysis, Obesity, Chemical research, Control equipment, Editors, Biochemistry, Health
Abstract

2019 APR 20 (NewsRx) -- By a News Reporter-Staff News Editor at Obesity, Fitness & Wellness Week -- Current study results on Chemical Research - Chemical Sensors and Actuators have [...]

Published
2019

44. New Data from Anna University Illuminate Research in Data Analytics (Prefatory data analysis approach to synthetically generated pneumatic actuator data set)

Subjects
Control engineering -- Analysis, Actuators -- Analysis, Information management -- Analysis, Information accessibility, Computers, Anna University
Abstract

2022 SEP 13 (VerticalNews) -- By a News Reporter-Staff News Editor at Information Technology Newsweekly -- New research on data analytics is the subject of a new report. According to [...]

Published
2022

45. Reports on Information Technology Findings from Shanghai Jiao Tong University Provide New Insights (Resilient Anti-disturbance Dynamic Surface Control of Uncertain Strict-feedback Systems Subject To Partial Loss of Actuator Effectiveness)

Subjects
Actuators -- Analysis, Computers
Abstract

2022 AUG 23 (VerticalNews) -- By a News Reporter-Staff News Editor at Information Technology Newsweekly -- Current study results on Information Technology have been published. According to news originating from [...]

Published
2022

46. Researchers at University of Jinan Release New Data on Chemical Sensors and Actuators (Bioactivity-protective Electrochemiluminescence Sensor Using Ceo2/co4n Heterostructures As Highly Effective Coreaction Accelerators for Ultrasensitive ...)

Subjects
Actuators -- Analysis, Sensors -- Analysis, Biological sciences, Health
Abstract

2022 APR 12 (NewsRx) -- By a News Reporter-Staff News Editor at Life Science Weekly -- Investigators discuss new findings in Chemical Research - Chemical Sensors and Actuators. According to [...]

Published
2022

47. Tuning of the acoustic boundary conditions of combustion test rigs with active control: extension to actuators with nonlinear response

Author

Bothien, Mirko R. and Paschereit, Christian Oliver

Subjects
Actuators -- Analysis, Control systems -- Analysis, Combustion -- Analysis, Engineering and manufacturing industries, Science and technology
Abstract

In the design process, new burners are generally tested in combustion test rigs. With these experiments, as well as with computational fluid dynamics, finite element calculations, and low-order network models, the burner's performance in the full-scale engine is sought to be predicted. Especially, information about the thermoacoustic behavior and the emissions is very important. As the thermoacoustics strongly depend on the acoustic boundary conditions of the system, it is obvious that test rig conditions should match or be close to those of the full-scale engine. This is, however, generally not the case. Hence, if the combustion process in the test rig is stable at certain operating conditions, it may show unfavorable dynamics at the same conditions in the engine. In previous works, the authors introduced an active control scheme, which is able to mimic almost arbitrary acoustic boundary conditions. Thus, the test rig properties can be tuned to correspond to those of the full-scale engine. The acoustic boundary conditions were manipulated using woofers. In the present study, an actuator with higher control authority is investigated, which could be used to apply the control scheme in industrial test rigs. The actuator modulates an air mass flow to generate an acoustic excitation. However, in contrast to the woofers, it exhibits a strong nonlinear response regarding amplitude and frequency. Thus, the control scheme is further developed to account for these nonlinear transfer characteristics. This modified control scheme is then applied to change the acoustic boundary conditions of an atmospheric swirl-stabilized combustion test rig. Excellent results were obtained in terms of changing the reflection coefficient to different levels. By manipulating its phase, different resonance frequencies could be imposed without any hardware changes. The nonlinear control approach is not restricted to the actuator used in this study and might therefore be of use for other actuators as well [DOI: 10.1115/1.4000599] Keywords: burner development, impedance tuning, acoustic boundary condition, thermoacoustic

Published
2010

49. Parametric optimization of a four-link close-chain manipulator with active and passive actuators

Author

Demydyuk, M.V.

Subjects
Actuators -- Analysis, Algorithms -- Analysis, Control equipment industry -- Analysis, Algorithm, Mathematics
Abstract

We investigate the problem of optimization of motion laws and design parameters of a four-link manipulator with a closed-chain kinematic structure. The manipulator performs cyclic transfer operations in a horizontal plane under the action of active and passive (springs and dampers) actuators. As a minimization criterion, we take a quadratic (with respect to control moments of forces) functional. An algorithm is proposed for constructing a suboptimal solution of the formulated problem based on parametrization of the generalized coordinates of the manipulator with a family of given functions and on the use of numerical procedures of mathematical programming. UDC 531.8+62-50, In recent years, among manipulation robots operating in various branches of modern industry, manipulator systems with a closed-chain kinematic structure are rather extensively used. The closeness of the kinematic structure [...]

Published
2010

50. Dahl model-based hysteresis compensation and precise positioning. Control of an XY parallel micromanipulator with piezoelectric actuation

Author

Xu, Qingsong and Li, Yangmin

Subjects
Actuators -- Design and construction, Actuators -- Analysis, Mathematical models -- Usage, Engineering and manufacturing industries, Science and technology
Abstract

This paper presents a new control scheme for the hysteresis compensation and precise positioning of a piezoelectrically actuated micromanipulator. The scheme employs an inverse Dahl model-based feedforward in combination with a repetitive proportional-integral-derivative feedback control algorithm along with an antiwindup strategy. The dynamic model of the system with Dahl hysteresis is established and identified through particle swarm optimization approach. The necessity of using global optimization and how to choose the model parameters to be optimized are addressed as well. The effectiveness of the proposed controller is demonstrated by several experimental studies on an XY parallel micromanipulator. Experimental results reveal that both antiwindup and repetitive control strategies can improve the positioning accuracy of the system, and a well performance of the proposed scheme for both one-dimensional tracking and two-dimensional contouring tasks of the micromanipulator is achieved. Moreover, due to a simple structure, the proposed methodology can be easily generalized to other micro- or nanomanipulators with piezoelectric actuation as well. [DOI: 10.1115/1.4001712]

Published
2010

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