servon.¹

Brit.

/ˈsəːvəʊ/, U.S.

/ˈsərvoʊ/

Origin: Formed within English, by clipping or shortening. Etymons: servo motor n.; servomechanism n.

Etymology: Partly shortened < servo motor n., and partly (in later use) shortened < servomechanism n. Compare earlier servo motor n.

a. Originally: a mechanism which transmits and magnifies motion or pressure, so as to reduce the force needed to operate part of a machine. In later use: a powered device which produces precise and controlled motion or pressure by means of a feedback loop.Recorded earliest as a modifier in the name of a product.

ΘΚΠ

society > occupation and work > equipment > machine > parts of machines > mechanism > [noun] > servo-mechanism

servo1909

servomechanism1920

servo system1920

servo control1939

1909 Locomotive 15 Nov. 213/2 A patent ‘Servo’ regulator valve is fitted in the dome of the boiler.

1948 I. A. Greenwood in I. A. Greenwood et al. Electronic Instruments viii. 220 A convenient classification of servos may be made in accordance with their uses, the principal examples of which are ‘position servos’ and ‘velocity servos’.

1971 Sci. Amer. July 120/3 The first truly automatic servo..was the fantail, a small windwheel mounted at right angles to the main sails and geared to turn the entire top of the windmill.

2011 E. Sobey Robot Exper. iii. 46 The Super Cricket circuit board has eight servo motor ports, which means you can use it to control eight servos.

b. More fully brake servo. A device or mechanism in a motor vehicle which reduces the amount of pressure the driver has to apply to the brake pedal. Cf. servo brake n. at Compounds 2.One of the most common types of brake servo uses the vacuum produced by the vehicle's engine or a vacuum pump to provide additional force when braking.

ΚΠ

1924 Motor 7 Oct. 448/3 The servo actually trebles the braking effect usually obtainable for a given pedal pressure.

1959 Times 1 Sept. 12/2 The..company have now introduced a vacuum-hydraulic brake servo which can be fitted easily to cars and light motor vehicles and is claimed to make a vast improvement in braking.

1989 Pop. Sci. Aug. 16/3 In the absence of engine vacuum, BMW developed a special mechanical brake servo.

2005 A. Bonnick & D. Newbold Pract. Approach to Motor Vehicle Engin. & Maintenance (ed. 2) vii. 191/1 The servo is the device which allows the driver to apply a large braking force by the application of relatively light force from the foot.

c. Physiology. The contraction of a muscle in response to stretching of the same muscle (stretch reflex), regarded as a servo loop; the anatomical mechanism responsible for this.

ΘΚΠ

the world > life > biology > biological processes > mechanism for self-regulation > [noun]

regulation1898

servo1953

servomechanism1953

1953 P. A. Merton in J. L. Malcolm & J. A. B. Gray Spinal Cord (Ciba Found. Symp.) 249 The stretch reflex servo, which is so obviously concerned with maintaining length and not tension, must necessarily have receptors which record length.

1968 Brain 91 397 It would be hard to find elsewhere a better concise account of the stretch reflex and the muscle servo.

1983 Brain Res. 267 345/1 The increased amplitude tremor appears to result from a progressive increase in gain, or altered operating point, of the stretch servo.

2010 Human Movement Sci. 29 671 The muscle servo of Merton is effectively only brought into play when the actual length trajectory of the muscle deviates from the intended trajectory set on the fusimotor system.

Compounds

C1. As a modifier, with the sense ‘by means of a servo’, as in servo-actuated, servo-assisted, servo-driven, servo-operated (adjectives).

ΚΠ

1924 Times 14 Mar. 10/1 (advt.) Servo Operated Four-wheel Brakes on each.

1924 Commerc. Motor 18 Mar. 135 (heading) Three brakes—one servo-assisted and acting on all four wheels.

1925 Automotive Abstr. 20 Jan. 14/3 Geo. H. Lanchester of England states that while this feature may be necessary in the case of servo-actuated brakes, he considers that..the brake designed to relieve itself when cornering does not do so.

1941 R. C. Russell U.S. Patent 2,236,415 3/2 Under no circumstances..may the servo driven member be caused to rotate equally with the driving member.

1961 Hovering Craft & Hydrofoil Oct. 18/2 The ultimate servo-actuated mechanical device may take ten years.

1972 J. Blish Star Trek 5 3 He..tried to release him, but the shackles turned out to be servo-driven.

2006 Daily Star (Nexis) 13 Aug. 49 A system of servo-operated butterfly valves cuts noise at urban speeds.

2017 Daily Tel. (Nexis) 3 Apr. (Cars section) It has servo-assisted brakes so it does stop pretty rapidly.

C2.

servo actuation n. the use of a servo to control a component or device; an instance of this.

ΚΠ

1936 C. G. J. Dunsford & P. G. E. Hand Brit. Patent 455,745 1 A water rudder for a flying-boat or sea-plane..is constructed with a main portion carrying an auxiliary portion, the latter being coupled to the operating mechanism and providing a servo-actuation of the main portion.

1962 IRE Trans. Automatic Control 7 72/2 One can deactivate any control element in any desired intermediate position in case of malfunction of the servo-actuation sub-system.

2014 R. Branfill-Cook Torpedo iv. 40/1 The Obry itself was further improved by the introduction of servo actuation of its control impulses.

servo actuator n. a servomotor or servomechanism.

ΚΠ

1938 E. Davis U.S. Patent 2,114,776 10/1 The air tube connection and its relay control from the cycle timer CT are not shown here, but are similar in arrangement to one or more servo actuators heretofore explained.

1970 Times 4 Sept. (Aviation Suppl.) p. iv/4 Savings will also accrue from the replacement of the common mechanically coupled control systems in the aircraft by electronic systems with electro-hydraulic servo-actuators operating various aircraft control surfaces.

2003 Business & Commerc. Aviation (Nexis) Sept. 90 The displays, LRUs and servo actuators are pretty much interchangeable between all aircraft we saw.

servo amplifier n. a component of a servomechanism that amplifies the control signal in order to transmit power to a servomotor, using feedback signals to automatically regulate the motor's operation; = servo drive n.

ΚΠ

1944 Port Arthur (Texas) News 12 Dec. 4/4 The operator merely presses a button and selsyns, servo amplifiers, amplidyne generators and other robots automatically compute range, aim several guns as a unit, load the chambers and fire the weapons at the right spot.

1966 McGraw-Hill Encycl. Sci. & Technol. (rev. ed.) XII. 199/2 The servoamplifier is often electronic but may be a magnetic amplifier, a relay type of amplifier, or any combination of these types.

2011 Computer Music Jrnl. 35 46/2 Current was sourced by a servo amplifier..in proportion to a voltage command issued from a desktop computer through an interface board.

servo assistance n. (in a motor vehicle) the use of a servo to assist with braking; a servo device or mechanism; see sense b.

ΚΠ

1925 Times 8 Dec. 22/5 The first pressure of the brake pedal causes lined shoes in enclosed ribbed drums on all four wheels to expand with servo assistance.

1972 Guardian 28 Jan. 3/4 (advt.) To stop, there's a dual circuit four-disc system with servo assistance.

2016 T. Denton Electric & Hybrid Vehicles (e-book ed.) iv Brakes are normally operated hydraulically, but with some sort of servo assistance.

servo brake n. a vehicle brake equipped with a device or mechanism which reduces the amount of pressure the driver has to apply to the brake pedal; cf. sense b.

ΚΠ

1920 Motor Age 13 May 32/2 The brakes are applied by means of a servo-brake which makes use of the momentum of the car to arrest its progress.

1965 Courier-Express (DuBois, Pa.) 23 June (Auto Show Suppl.) 11/3 A new braking system with double-action servo brakes and two-stage front and rear springs..are other features.

2014 W. Post in K. Reif Brakes, Brake Control & Driver Assistance Syst. 61/1 When the vehicle is reversing, the servo brake acts in the same way as a simplex brake.

servo braking n. (in a motor vehicle) braking that is assisted by a servo (see sense b).

ΚΠ

1924 Motor 28 Oct. 707/1 We are now able..to give the first complete description of the servo-braking system adopted.

1962 Times 8 Mar. 7 (advt.) Servo braking standard. Increased load carrying area. Diesel power.

2014 B. Wanklyn Austin Allegro (e-book ed.) ii. Servo braking assistance was standard, with twin horns to blast lesser cars out of its way.

servo drive n. an amplifier which supplies a servomotor with an electrical current specified by a control signal and regulates its operation in response to a feedback signal.

ΚΠ

1947 Jrnl. Inst. Electr. Engineers 94 177 A servo drive was incorporated in the next type, the Mark 6.

1979 Pop. Sci. June 74/1 Gearless servo drives, linked to ship-motion sensors, automatically adjust for pitch and roll.

2018 J. A. Melkebeek Electr. Machines & Drives 523 In contrast to other servo drives, they [sc. stepping motors] give a controlled, stepwise motion without any need for position measurement and feedback.

servo flap n. Aeronautics (a) a hinged flap on the trailing edge of a control surface of an aeroplane, designed to automatically move in the direction opposite that of the moving control surface; = balance tab n. at balance n.¹ Additions (now rare); (b) a flap attached to the trailing edge of a helicopter's rotor blade, where it performs a function similar to that performed by the elevators in an aeroplane.Cf. servo tab n.

ΚΠ

1929 Rep. & Mem. Aeronaut. Res. Comm. (H.M.S.O.) No. 1262. 2 The control column is attached directly to the servo flap by means of wires.

1964 U.S. Patent 3,129,769 1 This invention..deals more particularly with helicopters having main lifting rotors controlled in pitch by means of servo flaps attached to the blades of the rotors.

2016 R. Ganguli et al. Smart Helicopter Rotors iii. 71 There are primarily two types of flaps that are suitable to be mounted on helicopter blades: plain flaps and servo-flaps.

servohydraulic adj. both hydraulic and actuated by a servomechanism.

ΚΠ

1922 Illustr. London News 4 Nov. (Motor Suppl.) p. xiv/3 A notable point is the four-wheel braking, controlled by a servo-hydraulic mechanism with automatic compensator.

1972 Physics Bull. Aug. 492/2 Fulmer Research Institute has recently installed a Mand servohydraulic testing facility to meet the increasing demand for testing larger specimens under widely varying rates of loading.

2007 Science 5 Oct. 83 (caption) The tensile strengths reported were obtained using both a commercially available servohydraulic test system and a custom in house-built tensiometer.

servo loop n. a feedback loop (see loop n.¹ 4l) in operation in a servomechanism.

ΚΠ

1945 Proc. IRE 33 767/2 Curves II show the gain and phase of a servo loop after equalization.

1946 Radar: Summary Rep. & Harp Project (U.S. National Defense Res. Comm., Div. 14) 143/2 Servo loop, that collection of elements in a servomechanism which measures the error in the quantity to be controlled and applies a correction tending to reduce that error to zero.

1953 P. A. Merton in J. L. Malcolm & J. A. B. Gray Spinal Cord (Ciba Found. Symp.) 247 The stretch reflex is a feedback or servo loop, the feedback being negative.

1978 R. Jansson News Caper 10 Even with all the damping in the servo loops the controls leaped out of my hands... We flopped around the sky.

2012 Philos. Trans. (Royal Soc.) A. 370 851 These valves are in a servo loop, which keeps the temperature constant.

servo-multiplier n. Computing (now historical) (in an analogue computer) an electromechanical multiplier (multiplier n. 6) in which multiplication is performed by the movement of one or more potentiometers, across which different voltages are applied, by a servomechanism.

ΚΠ

1947 Proc. IRE 35 450/1 In view of the fact that the quantities involved are usually voltages, simple servomultiplier and divider circuits will be described.

1965 A. W. Langill Automatic Control Syst. Engin. II. xviii. 503 Although the servomultiplier is normally employed to form the product of two analog voltages, the system is also used extensively in the generation of arbitrary functions.

1996 L. J. Kamm Understanding Electro-Mechanical Engin. i. 28 A more sophisticated form of electronic analog computer uses operational amplifiers to add, differentiate, and integrate. It uses EM servo-multipliers and EM sine/cosine generators for trigonometric functions.

servo system n. = servomechanism n.

ΘΚΠ

society > occupation and work > equipment > machine > parts of machines > mechanism > [noun] > servo-mechanism

servo1909

servomechanism1920

servo system1920

servo control1939

1920 Times 12 Nov. 7/4 The carburettor is fitted with a variable choke, and four-wheel braking on the ‘Servo’ system.

1946 Radar: Summary Rep. & Harp Project (U.S. National Defense Res. Comm., Div. 14) 143/2 Servo system, a mechanical, frequently electromechanical, system for transmitting accurate mechanical position from one point to another by electrical or other means. The position is corrected by feeding back an error signal.

1964 Language 40 219 The fact that some sort of neurological servosystem does monitor encoding cannot be doubted.

2012 Daily Mail (Nexis) 28 Apr. (India News section) The heavy gun has servo systems which can, with modifications, provide it autonomous firing capability on the battlefield.

servo tab n. Aeronautics (a) (originally) a hinged flap on the trailing edge of a control surface of an aeroplane, designed to automatically move in the direction opposite that of the moving control surface; = balance tab n. at balance n.¹ Additions; (b) (in later use also) a flap attached to the trailing edge of a helicopter's rotor blade, where it performs a function similar to that performed by the elevators in an aeroplane.

ΚΠ

1937 Jrnl. Aeronaut. Sci. 4 388/1 Balanced and unbalanced control surfaces, each equipped with the same servo tab.

1952 Flying May 31 Has improved servo tabs, longer rotor blades, twin fins.

2013 W. Johnson Rotorcraft Aeromech. i. 19 Servo tabs on the blades produced cyclic and collective pitch changes.

2016 Pilot's Handbk. Aeronaut. Knowl. (Federal Aviation Administration) (rev. ed.) vi. 11/2 Servo tabs are sometimes referred to as flight tabs and are used primarily on large aircraft.

servo valve n. a valve that supplies hydraulic fluid to an actuator in response to an electrical signal.

ΚΠ

1969 I. I. McNaughtan & S. W. Chisman Study of Hail Impact at High Speed on Light Alloy Plates 2 The gun is operated by compressed gas..and firing is by means of a gas driven servo-valve inside the firing chamber.

1986 Pop. Sci. July 62/2 Each strut can be powered either up or down, with speed and direction controlled by high-speed servo valves.

2015 K. Behbehani in J. D. Bronzino & D. R. Peterson Med. Devices & Human Engin. xviii. 1 Today's respirators employ an array of sophisticated components, such as microprocessors, fast-response servo valves, and precision transducers.

This entry has been updated (OED Third Edition, March 2021; most recently modified version published online March 2022).

单词	servo
释义	servon.¹ Brit. /ˈsəːvəʊ/, U.S. /ˈsərvoʊ/ Origin: Formed within English, by clipping or shortening. Etymons: servo motor n.; servomechanism n. Etymology: Partly shortened < servo motor n., and partly (in later use) shortened < servomechanism n. Compare earlier servo motor n. a. Originally: a mechanism which transmits and magnifies motion or pressure, so as to reduce the force needed to operate part of a machine. In later use: a powered device which produces precise and controlled motion or pressure by means of a feedback loop.Recorded earliest as a modifier in the name of a product. ΘΚΠ society > occupation and work > equipment > machine > parts of machines > mechanism > [noun] > servo-mechanism servo1909 servomechanism1920 servo system1920 servo control1939 1909 Locomotive 15 Nov. 213/2 A patent ‘Servo’ regulator valve is fitted in the dome of the boiler. 1948 I. A. Greenwood in I. A. Greenwood et al. Electronic Instruments viii. 220 A convenient classification of servos may be made in accordance with their uses, the principal examples of which are ‘position servos’ and ‘velocity servos’. 1971 Sci. Amer. July 120/3 The first truly automatic servo..was the fantail, a small windwheel mounted at right angles to the main sails and geared to turn the entire top of the windmill. 2011 E. Sobey Robot Exper. iii. 46 The Super Cricket circuit board has eight servo motor ports, which means you can use it to control eight servos. b. More fully brake servo. A device or mechanism in a motor vehicle which reduces the amount of pressure the driver has to apply to the brake pedal. Cf. servo brake n. at Compounds 2.One of the most common types of brake servo uses the vacuum produced by the vehicle's engine or a vacuum pump to provide additional force when braking. ΚΠ 1924 Motor 7 Oct. 448/3 The servo actually trebles the braking effect usually obtainable for a given pedal pressure. 1959 Times 1 Sept. 12/2 The..company have now introduced a vacuum-hydraulic brake servo which can be fitted easily to cars and light motor vehicles and is claimed to make a vast improvement in braking. 1989 Pop. Sci. Aug. 16/3 In the absence of engine vacuum, BMW developed a special mechanical brake servo. 2005 A. Bonnick & D. Newbold Pract. Approach to Motor Vehicle Engin. & Maintenance (ed. 2) vii. 191/1 The servo is the device which allows the driver to apply a large braking force by the application of relatively light force from the foot. c. Physiology. The contraction of a muscle in response to stretching of the same muscle (stretch reflex), regarded as a servo loop; the anatomical mechanism responsible for this. ΘΚΠ the world > life > biology > biological processes > mechanism for self-regulation > [noun] regulation1898 servo1953 servomechanism1953 1953 P. A. Merton in J. L. Malcolm & J. A. B. Gray Spinal Cord (Ciba Found. Symp.) 249 The stretch reflex servo, which is so obviously concerned with maintaining length and not tension, must necessarily have receptors which record length. 1968 Brain 91 397 It would be hard to find elsewhere a better concise account of the stretch reflex and the muscle servo. 1983 Brain Res. 267 345/1 The increased amplitude tremor appears to result from a progressive increase in gain, or altered operating point, of the stretch servo. 2010 Human Movement Sci. 29 671 The muscle servo of Merton is effectively only brought into play when the actual length trajectory of the muscle deviates from the intended trajectory set on the fusimotor system. Compounds C1. As a modifier, with the sense ‘by means of a servo’, as in servo-actuated, servo-assisted, servo-driven, servo-operated (adjectives). ΚΠ 1924 Times 14 Mar. 10/1 (advt.) Servo Operated Four-wheel Brakes on each. 1924 Commerc. Motor 18 Mar. 135 (heading) Three brakes—one servo-assisted and acting on all four wheels. 1925 Automotive Abstr. 20 Jan. 14/3 Geo. H. Lanchester of England states that while this feature may be necessary in the case of servo-actuated brakes, he considers that..the brake designed to relieve itself when cornering does not do so. 1941 R. C. Russell U.S. Patent 2,236,415 3/2 Under no circumstances..may the servo driven member be caused to rotate equally with the driving member. 1961 Hovering Craft & Hydrofoil Oct. 18/2 The ultimate servo-actuated mechanical device may take ten years. 1972 J. Blish Star Trek 5 3 He..tried to release him, but the shackles turned out to be servo-driven. 2006 Daily Star (Nexis) 13 Aug. 49 A system of servo-operated butterfly valves cuts noise at urban speeds. 2017 Daily Tel. (Nexis) 3 Apr. (Cars section) It has servo-assisted brakes so it does stop pretty rapidly. C2. servo actuation n. the use of a servo to control a component or device; an instance of this. ΚΠ 1936 C. G. J. Dunsford & P. G. E. Hand Brit. Patent 455,745 1 A water rudder for a flying-boat or sea-plane..is constructed with a main portion carrying an auxiliary portion, the latter being coupled to the operating mechanism and providing a servo-actuation of the main portion. 1962 IRE Trans. Automatic Control 7 72/2 One can deactivate any control element in any desired intermediate position in case of malfunction of the servo-actuation sub-system. 2014 R. Branfill-Cook Torpedo iv. 40/1 The Obry itself was further improved by the introduction of servo actuation of its control impulses. servo actuator n. a servomotor or servomechanism. ΚΠ 1938 E. Davis U.S. Patent 2,114,776 10/1 The air tube connection and its relay control from the cycle timer CT are not shown here, but are similar in arrangement to one or more servo actuators heretofore explained. 1970 Times 4 Sept. (Aviation Suppl.) p. iv/4 Savings will also accrue from the replacement of the common mechanically coupled control systems in the aircraft by electronic systems with electro-hydraulic servo-actuators operating various aircraft control surfaces. 2003 Business & Commerc. Aviation (Nexis) Sept. 90 The displays, LRUs and servo actuators are pretty much interchangeable between all aircraft we saw. servo amplifier n. a component of a servomechanism that amplifies the control signal in order to transmit power to a servomotor, using feedback signals to automatically regulate the motor's operation; = servo drive n. ΚΠ 1944 Port Arthur (Texas) News 12 Dec. 4/4 The operator merely presses a button and selsyns, servo amplifiers, amplidyne generators and other robots automatically compute range, aim several guns as a unit, load the chambers and fire the weapons at the right spot. 1966 McGraw-Hill Encycl. Sci. & Technol. (rev. ed.) XII. 199/2 The servoamplifier is often electronic but may be a magnetic amplifier, a relay type of amplifier, or any combination of these types. 2011 Computer Music Jrnl. 35 46/2 Current was sourced by a servo amplifier..in proportion to a voltage command issued from a desktop computer through an interface board. servo assistance n. (in a motor vehicle) the use of a servo to assist with braking; a servo device or mechanism; see sense b. ΚΠ 1925 Times 8 Dec. 22/5 The first pressure of the brake pedal causes lined shoes in enclosed ribbed drums on all four wheels to expand with servo assistance. 1972 Guardian 28 Jan. 3/4 (advt.) To stop, there's a dual circuit four-disc system with servo assistance. 2016 T. Denton Electric & Hybrid Vehicles (e-book ed.) iv Brakes are normally operated hydraulically, but with some sort of servo assistance. servo brake n. a vehicle brake equipped with a device or mechanism which reduces the amount of pressure the driver has to apply to the brake pedal; cf. sense b. ΚΠ 1920 Motor Age 13 May 32/2 The brakes are applied by means of a servo-brake which makes use of the momentum of the car to arrest its progress. 1965 Courier-Express (DuBois, Pa.) 23 June (Auto Show Suppl.) 11/3 A new braking system with double-action servo brakes and two-stage front and rear springs..are other features. 2014 W. Post in K. Reif Brakes, Brake Control & Driver Assistance Syst. 61/1 When the vehicle is reversing, the servo brake acts in the same way as a simplex brake. servo braking n. (in a motor vehicle) braking that is assisted by a servo (see sense b). ΚΠ 1924 Motor 28 Oct. 707/1 We are now able..to give the first complete description of the servo-braking system adopted. 1962 Times 8 Mar. 7 (advt.) Servo braking standard. Increased load carrying area. Diesel power. 2014 B. Wanklyn Austin Allegro (e-book ed.) ii. Servo braking assistance was standard, with twin horns to blast lesser cars out of its way. servo drive n. an amplifier which supplies a servomotor with an electrical current specified by a control signal and regulates its operation in response to a feedback signal. ΚΠ 1947 Jrnl. Inst. Electr. Engineers 94 177 A servo drive was incorporated in the next type, the Mark 6. 1979 Pop. Sci. June 74/1 Gearless servo drives, linked to ship-motion sensors, automatically adjust for pitch and roll. 2018 J. A. Melkebeek Electr. Machines & Drives 523 In contrast to other servo drives, they [sc. stepping motors] give a controlled, stepwise motion without any need for position measurement and feedback. servo flap n. Aeronautics (a) a hinged flap on the trailing edge of a control surface of an aeroplane, designed to automatically move in the direction opposite that of the moving control surface; = balance tab n. at balance n.¹ Additions (now rare); (b) a flap attached to the trailing edge of a helicopter's rotor blade, where it performs a function similar to that performed by the elevators in an aeroplane.Cf. servo tab n. ΚΠ 1929 Rep. & Mem. Aeronaut. Res. Comm. (H.M.S.O.) No. 1262. 2 The control column is attached directly to the servo flap by means of wires. 1964 U.S. Patent 3,129,769 1 This invention..deals more particularly with helicopters having main lifting rotors controlled in pitch by means of servo flaps attached to the blades of the rotors. 2016 R. Ganguli et al. Smart Helicopter Rotors iii. 71 There are primarily two types of flaps that are suitable to be mounted on helicopter blades: plain flaps and servo-flaps. servohydraulic adj. both hydraulic and actuated by a servomechanism. ΚΠ 1922 Illustr. London News 4 Nov. (Motor Suppl.) p. xiv/3 A notable point is the four-wheel braking, controlled by a servo-hydraulic mechanism with automatic compensator. 1972 Physics Bull. Aug. 492/2 Fulmer Research Institute has recently installed a Mand servohydraulic testing facility to meet the increasing demand for testing larger specimens under widely varying rates of loading. 2007 Science 5 Oct. 83 (caption) The tensile strengths reported were obtained using both a commercially available servohydraulic test system and a custom in house-built tensiometer. servo loop n. a feedback loop (see loop n.¹ 4l) in operation in a servomechanism. ΚΠ 1945 Proc. IRE 33 767/2 Curves II show the gain and phase of a servo loop after equalization. 1946 Radar: Summary Rep. & Harp Project (U.S. National Defense Res. Comm., Div. 14) 143/2 Servo loop, that collection of elements in a servomechanism which measures the error in the quantity to be controlled and applies a correction tending to reduce that error to zero. 1953 P. A. Merton in J. L. Malcolm & J. A. B. Gray Spinal Cord (Ciba Found. Symp.) 247 The stretch reflex is a feedback or servo loop, the feedback being negative. 1978 R. Jansson News Caper 10 Even with all the damping in the servo loops the controls leaped out of my hands... We flopped around the sky. 2012 Philos. Trans. (Royal Soc.) A. 370 851 These valves are in a servo loop, which keeps the temperature constant. servo-multiplier n. Computing (now historical) (in an analogue computer) an electromechanical multiplier (multiplier n. 6) in which multiplication is performed by the movement of one or more potentiometers, across which different voltages are applied, by a servomechanism. ΚΠ 1947 Proc. IRE 35 450/1 In view of the fact that the quantities involved are usually voltages, simple servomultiplier and divider circuits will be described. 1965 A. W. Langill Automatic Control Syst. Engin. II. xviii. 503 Although the servomultiplier is normally employed to form the product of two analog voltages, the system is also used extensively in the generation of arbitrary functions. 1996 L. J. Kamm Understanding Electro-Mechanical Engin. i. 28 A more sophisticated form of electronic analog computer uses operational amplifiers to add, differentiate, and integrate. It uses EM servo-multipliers and EM sine/cosine generators for trigonometric functions. servo system n. = servomechanism n. ΘΚΠ society > occupation and work > equipment > machine > parts of machines > mechanism > [noun] > servo-mechanism servo1909 servomechanism1920 servo system1920 servo control1939 1920 Times 12 Nov. 7/4 The carburettor is fitted with a variable choke, and four-wheel braking on the ‘Servo’ system. 1946 Radar: Summary Rep. & Harp Project (U.S. National Defense Res. Comm., Div. 14) 143/2 Servo system, a mechanical, frequently electromechanical, system for transmitting accurate mechanical position from one point to another by electrical or other means. The position is corrected by feeding back an error signal. 1964 Language 40 219 The fact that some sort of neurological servosystem does monitor encoding cannot be doubted. 2012 Daily Mail (Nexis) 28 Apr. (India News section) The heavy gun has servo systems which can, with modifications, provide it autonomous firing capability on the battlefield. servo tab n. Aeronautics (a) (originally) a hinged flap on the trailing edge of a control surface of an aeroplane, designed to automatically move in the direction opposite that of the moving control surface; = balance tab n. at balance n.¹ Additions; (b) (in later use also) a flap attached to the trailing edge of a helicopter's rotor blade, where it performs a function similar to that performed by the elevators in an aeroplane. ΚΠ 1937 Jrnl. Aeronaut. Sci. 4 388/1 Balanced and unbalanced control surfaces, each equipped with the same servo tab. 1952 Flying May 31 Has improved servo tabs, longer rotor blades, twin fins. 2013 W. Johnson Rotorcraft Aeromech. i. 19 Servo tabs on the blades produced cyclic and collective pitch changes. 2016 Pilot's Handbk. Aeronaut. Knowl. (Federal Aviation Administration) (rev. ed.) vi. 11/2 Servo tabs are sometimes referred to as flight tabs and are used primarily on large aircraft. servo valve n. a valve that supplies hydraulic fluid to an actuator in response to an electrical signal. ΚΠ 1969 I. I. McNaughtan & S. W. Chisman Study of Hail Impact at High Speed on Light Alloy Plates 2 The gun is operated by compressed gas..and firing is by means of a gas driven servo-valve inside the firing chamber. 1986 Pop. Sci. July 62/2 Each strut can be powered either up or down, with speed and direction controlled by high-speed servo valves. 2015 K. Behbehani in J. D. Bronzino & D. R. Peterson Med. Devices & Human Engin. xviii. 1 Today's respirators employ an array of sophisticated components, such as microprocessors, fast-response servo valves, and precision transducers. This entry has been updated (OED Third Edition, March 2021; most recently modified version published online March 2022). servon.² Brit. /ˈsəːvəʊ/, U.S. /ˈsərvoʊ/, Australian English /ˈsɜːvoʊ/ Origin: Formed within English, by derivation. Etymons: service station n., -o suffix. Etymology: < serv- (in service station n.) + -o suffix. Australian colloquial. A service station (sense 2). ΚΠ 1985 Telegraph (Brisbane) 20 Aug. 5 The servo would have gone up [in flames], taking with it the adjoining house. 1994 J. Birmingham He died with Felafel in his Hand (1997) vi. 135 We went into a Shell servo to get some change. 2013 C. Tsiolkas Barracuda (2014) 284 Uni's tough, you have to work hard. It's not a piece of piss like working in a servo or a supermarket. This entry has been updated (OED Third Edition, March 2021; most recently modified version published online March 2022). servov. Brit. /ˈsəːvəʊ/, U.S. /ˈsərvoʊ/ Origin: Formed within English, by conversion. Etymon: servo n.¹ Etymology: < servo n.¹ Compare earlier servo-control v. and servoing n. transitive. To control or operate by a servomechanism. ΘΚΠ society > occupation and work > equipment > machine > parts of machines > mechanism > operate mechanism [verb (transitive)] > operate by servo-mechanism servo control1919 servo1954 1954 Trans. IRE Professional Group Electronic Computers 3 No. 2. 27/1 The register is then servoed until the input rates of each input are the same. 1971 New Scientist 12 Aug. 359/2 Ferguson solved this problem with their ingenious double-sided vacuum servo, which servos the brakes on. 2005 Publ. Astron. Soc. Pacific 117 222/2 A German sensor that was servoed to follow a characteristic curve drawn on graph paper in conducting ink. Derivatives ˈservoed adj. ΚΠ 1957 IRE Trans. Instrumentation Mar. 12/1 The present state of engineering of electromechanical follow-up type servoed phase meters allows a measurement to be made to an accuracy of between one-half and one degree of phase data. 1978 Nature 20 Apr. 704/2 The mapping operation was achieved by driving the telescope in declination at the maximum servoed rate of 130′ min^—1 back and forth across the galactic plane. 2003 I. Banks Raw Spirit (2004) viii. 160 There is power-assisted steering and it does have upgraded, servoed brakes. This entry has been updated (OED Third Edition, March 2021; most recently modified version published online March 2022). < n.¹1909n.²1985v.1954
随便看	saneliest sanely saneness sanenesses saner sanes sanest sanfan sanfedist sanforized sanforizing sang sang royal sang-de-bœuf sang-froid sanga sangam sangar sangaree sangarees sangars sangas sangdebœuf sangeet sanger

servon.1

Compounds

servon.2

servov.

Derivatives

servon.¹

servon.²