ECE5320 Mechatronics Assignment#01: Literature Survey on Sensors and Actuators Topic: Electrohydraulic powered ActuatorsOutlineReference listTo explore furtherMajor applicationsSlide 6Basic Working PrincipleSlide 8Typical Sample ConfigurationSlide 10Major SpecificationsOutput ShaftWork CapacityOutput ForceHysteresisOperating TemperatureDrive speed and RotationLinearityLimitationsPurchasing InformationECE5320 MechatronicsAssignment#01: Literature Survey on Sensors and Actuators Assignment#01: Literature Survey on Sensors and Actuators Topic: Electrohydraulic powered ActuatorsPrepared by: Oscar DelgadoDept. of Electrical and Computer Engineering Utah State UniversityE: [email protected] F: (435)797-3054 (ECE Dept.)3/7/20093/7/2009ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-2Outline –Reference list–To probe further–Major applications–Basic working principle illustrated–A typical sample configuration in application–Major specifications–Limitations–Purchasing Information01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-3Reference list•Robert Bishop, Mechatronics Handbook, CRC press. http://www.engnetbase.com//books/774/0066ch20.pdf•Hindwarsh John, Renfrew Alasdair. Electrical machines and Drive Systems. Third Edition. 2000.•www.wikipedia.com•machinedesign.com/article/electrohydraulic-actuators•http://www.woodward.com/turbine/steam/steam2/actuators.cfm3/7/2009ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-4To explore further •http://www.freshpatents.com/-dt20090212ptan20090041599.php•Flowcontrol.globalspec.com/LearnMore/Flow_Transfer_Control/...Actuators.../Hydraulic_Electrohydraulic_Valve_Actuators.•findarticles.com/p/articles/mi_m0FZX/is_3_74/ai_n249635123/7/2009ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-5Major applications •The application of electronic controls to fluid power systems resulted in electrohydraulic control systems. Electrohydraulics has been widely used in aerospace, industrial, and mobile fluid power systems.•Electrohydraulic controls have some advantages over other types of control. First, an electrohydraulic system can be operated over a wide range of speeds, and its speed can be controlled continuously.3/7/2009ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-6Major applications •More important, an electrohydraulic system can be stalled or operated under very large acceleration without causing its components to be damaged. One example of an application is on steam turbines where isochronous control, load sharing, or other functions are required. Another application is on positioning steam and fuel-control valves requiring low/high force linear inputs. Fig. No. 2 UG-UG/40 E/H ActuatorsFig. No. 1 TG-13E E/H Actuator http://www.woodward.com/turbine/steam/steam2/actuators.cfm3/7/2009ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-7Basic Working Principle•An electro-hydraulic actuator includes an electric motor that drives a hydraulic pump to move fluid from a reservoir to a hydraulic actuator. When the electric motor is driven in a first rotational direction, the hydraulic fluid moved by the hydraulic pump extends a rod of the actuator. Fig. No. 3. Electrohydraulic Scheme http://www.engnetbase.com//books/774/0066ch20.pdf3/7/2009ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-8Basic Working Principle•When the electric motor is driven in a second rotational direction, opposite to the first rotational direction, the hydraulic fluid moved by the hydraulic pump retracts the rod of the actuator.Fig. No. 4. Electrohydraulic actuator block diagram http://www.engnetbase.com//books/774/0066ch20.pdf3/7/2009ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-9Typical Sample Configuration•A typical sample configuration of an electrohydraulic actuator is as turbine and engine control. One example is a proportional actuator for positioning steam and fuel-control valves requiring low/high force linear inputs. This actuator provide one inch of linear movement of valves for steam or gas turbines. The configuration of this actuator is as follows: • Output—linear, 25 mm (1") max stroke, 10.7 kN (2400 lbf) maxInput Power—552 to 8274 kPa (80 to 1200 psig), external supply oil.3/7/2009ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-10Typical Sample Configuration•Another sample configuration is a proportional electrohydraulic actuator which is design to control diesel and gas engines or steam and industrial gas turbines, and particularly is well suited for use in control systems requiring a rotary mechanical output that is proportional to electrical input. Fig. No. 5 TM-55P Proportional Actuatorhttp://www.woodward.com/turbine/steam/steam2/actuators.cfmOutput—rotary, 45 degrees, 75 J (55 ft-lb) max, position feedback = redundant RVDT/LVDTInput Power—2758 to 6895 kPa (400 to 1000 psig), external supply oil.3/7/2009ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-11Major Specifications• Specifications changes on the kind of application required to the actuator, however the major specifications are as follows: - Output Shaft - Work Capacity - Output Force - Hysteresis - Operating Temperature - Drive speed and rotation - Linearity3/7/2009ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-12Output Shaft• Is the shaft that transmits torque from the actuator to an engine or other device to be controlled by the electrohydraulic actuator. •Typically is a hardened 17-4 stainless steel 0.625-inch (15.88 mm) round, with one-inch square (645 mm²) 17-4 stainless steel rod end attached by 0.375-inch (9.52 mm)/24-threads/inch threads. Optional rod end features 0.625-inch (15.88 mm) slot with 0.500-inch (12.70 mm) hole to pin linkage to valve.3/7/2009ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-13Work Capacity• Is the energy(work) required by the output shaft to do a full travel angle. Standard UG-ACTUATOR 19.4 J (14.3 ft-lb) in the increase direction; 23.3 J (17.2 ft-lb) in the decrease direction. 20 ft-lb UG-ACTUATOR 27.2 J (20 ft-lb) in both directions. Remote UG-ACTUATOR 27.2 J (20 ft-lb) when supplied with 2760 kPa (400 psi); pressurized oil must be supplied to the actuator.
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