GB419186A - Improvements in and relating to a method of and apparatus for balancing rotating bodies - Google Patents

Improvements in and relating to a method of and apparatus for balancing rotating bodies

Info

Publication number
GB419186A
GB419186A GB4769/34A GB476934A GB419186A GB 419186 A GB419186 A GB 419186A GB 4769/34 A GB4769/34 A GB 4769/34A GB 476934 A GB476934 A GB 476934A GB 419186 A GB419186 A GB 419186A
Authority
GB
United Kingdom
Prior art keywords
rod
determined
shaft
balance
quantities
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB4769/34A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Publication of GB419186A publication Critical patent/GB419186A/en
Expired legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M1/00Testing static or dynamic balance of machines or structures
    • G01M1/02Details of balancing machines or devices
    • G01M1/04Adaptation of bearing support assemblies for receiving the body to be tested

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Testing Of Balance (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)

Abstract

419,186. Testing balance of rotary bodies. BRITISH THOMSON-HOUSTON CO., Ltd., Crown House, Aldwych, London.- (Assignees of Thearle, E. L.; 1278, Dean Street, Schenectady, New York, U.S.A.) Feb. 13, 1934, No. 4769. Convention date, Feb. 15, 1933. [Classes 106 (ii) and 106 (iv).] Comprises a method of and means for determining the amplitude and direction of maximum vibration at each of the bearings of the body in three cases : (a) as the body normally is ; (b) with the addition of a known out of balance weight at one end ; and (c) with the addition of a known out of balance weight at the other end. From the six readings taken the necessary corrections to secure balance are calculated. The rotor 1 to be balanced is mounted on the shaft 2 in its usual frame, the pedestals 3 of which carry brackets supporting small generators 4, 5. A single generator may be used and transferred from one pedestal to another as required. A contact device 6 is driven by a flexible shaft 7 from the shaft 2. The generators are connected to the contact device 6 through a switch 8 and galvanometer 9 calibrated in terms of vibration movement of the pedestals. Generators. Each generator 4, 5, Fig. 5, is carried by a bracket 10 rigidly secured to the pedestal. Mounted on a rod or tube 11 secured to the bracket 10 are spaced springs 12. These support the relatively massive magnet 13 of annular form having an annular air gap 14 between the poles. Each spring 12, Fig. 7, has four arms and by means of slits 15 is divided into two parts 16, 16<a> which are secured respectively to the non-magnetic head 17 and to the rod 11. The right hand spring is similarly secured to the head 18 and rod. The axial stiffness of the springs is compensated by a device consisting of two stiff struts 23 having knife edges at the ends located in grooves in blocks 20 carried by the part 18 and a block 22 carried by the rod 11, the blocks 20 being drawn together by two parallel and adjustable springs 24. This device is so adjusted that it assists the relative movement of field structure and rod 11 sufficiently to compensate axial stiffness of the springs 12. Modified arrangements of this compensating device are described. The armature comprises a coil of wire 25 mounted on an insulated annular support 25<a> carried by a spider 25<b> on the rod 11. As the machine pedestal vibrates, the coil moves axially and generates an electromotive force proportional to the velocity of vibration of the pedestal. Contact device. A stub shaft 26a in the casing 26 is driven from the shaft 7 and carries a cam 27 which has a raised surface 27<a> for 180‹ and also a pointer 28 located opposite the middle of the raised surface. A ring member 29 concentric with the shaft 26<a> can be turned through gearing from a handle 37 and carries fixed and movable contacts 31, 32 which are moved into engagement for half a revolution by the cam. A pointer 38 on the ring 29 reads over a fixed scale 39. Operation. A correct balance requires the addition or removal of two masses, one near each end. Four quantities must be determined, the amount and phase of each mass. This is determined in three runs. With the motor run up to a predetermined speed the switch 8 is operated to connect the motor at the end nearest the device 26. The plate 29 is adjusted until reading of the galvanometer is "zero." The pointer 38 gives the phase of maximum vibration. If the contacts are shifted further through 90‹ in the direction of rotation the galvanometer reading will be proportional to the relative amplitude. Thus one rector quantity N is determined. By switching to the other motor a similar quantity F is determined for the far end. A trial weight Wn is applied to the near end and quantities N2, F2 determined. A third run is made with a weight Wf applied to the far end and two quantities N3, F3 determined. From these six quantities the necessary corrections for out of balance can be calculated.
GB4769/34A 1933-02-15 1934-02-13 Improvements in and relating to a method of and apparatus for balancing rotating bodies Expired GB419186A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US419186XA 1933-02-15 1933-02-15

Publications (1)

Publication Number Publication Date
GB419186A true GB419186A (en) 1934-11-07

Family

ID=21919043

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4769/34A Expired GB419186A (en) 1933-02-15 1934-02-13 Improvements in and relating to a method of and apparatus for balancing rotating bodies

Country Status (1)

Country Link
GB (1) GB419186A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1568848A2 (en) * 2004-02-27 2005-08-31 ROLLS-ROYCE plc A method and machine for rotor imbalance determination
CN104236799A (en) * 2014-09-23 2014-12-24 国家电网公司 Dynamic balance method for fast eliminating vibration, in horizontal direction, of bearing pedestals
RU2781305C1 (en) * 2021-11-25 2022-10-11 Федеральное государственное бюджетное образовательное учреждение высшего образования "Уральский государственный лесотехнический университет" Method for determining the rotor fitting runout value of a disk mill

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1568848A2 (en) * 2004-02-27 2005-08-31 ROLLS-ROYCE plc A method and machine for rotor imbalance determination
EP1568848A3 (en) * 2004-02-27 2013-04-24 Rolls-Royce Plc A method and machine for rotor imbalance determination
CN104236799A (en) * 2014-09-23 2014-12-24 国家电网公司 Dynamic balance method for fast eliminating vibration, in horizontal direction, of bearing pedestals
RU2781305C1 (en) * 2021-11-25 2022-10-11 Федеральное государственное бюджетное образовательное учреждение высшего образования "Уральский государственный лесотехнический университет" Method for determining the rotor fitting runout value of a disk mill

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