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    Improvements in or relating to radio direction-finding equipment
    292.
    发明专利
    Improvements in or relating to radio direction-finding equipment 未知

    公开(公告)号：GB878592A

    公开(公告)日：1961-10-04

    申请号：GB3667059

    申请日：1959-10-28

    Applicant: SERVO CORP OF AMERICA

    IPC: G01S1/40

    Abstract: 878,592. Radio navigation. SERVO CORPORATION OF AMERICA. Oct. 28, 1959 [Feb. 20, 1959], No. 36670/59. Class 40(7) Relates to V.H.F. omni-directional ranges (V.O.R.s) in which the azimuth-dependent data is contained in a wave 30% amplitude-modulated at 30 c/s. and the azimuth reference is given by a 9À96 kc./s. sub-carrier frequency modulated at 30 c/s. with a maximum deviation of 480 c/s., the sub-carrier being 30% amplitude-modulated on the transmitted carrier, the airborne receiver comparing the phases of 30 c/s. filters one of which is fed from an F.M. detector connected to a 9À96 kc./s. filter. According to the present invention a Doppler-effect omni-range is provided using an aerial aperture of at least two wavelengths at the carrier frequency and is V.O.R.- compatible. Reduction of site &c. errors is thus afforded and existing aircraft receivers may be used for standard V.O.R. reception. The beacon Fig. 1 comprises a fixed aerial 9 fed from an amplitude-modulated amplifier 3 at a carrier frequency F and a commutated aerial array, Fig. 2 (not shown), fed with a carrier frequency of FŒ9À96 kc./s.; a 30 c/s. signal is derived from an alternator 4 driven by a motor 5 which also commutates the aerial at 30 r.p.s. Harmonic generator 22 may be included to increase angular resolution and speech modulation may be impressed on modulator 7. The aerial commutation described comprises a whirling primary coil and a ring of secondary coils connected to a corresponding ring of fixed aerials; or a whirling single aerial may be used. To ensure a frequency difference of 9À96 kc./s. between the carriers of the fixed and commutated aerials a stable oscillator 19 and reactance tube 13 are used. 48 aerials in a ring of 5À1# diameter are provided to give maximum Doppler-effect deviation. The airborne receiver Fig. 3 is partly of known form and to utilize the additional high resolution channel 39, 40 is provided. Since the Doppler-effect frequency deviation is proportional to cos. (elevation), a constant amplitude signal is fed from unit 41 to F.M. detector 36 the output of which is fed to indicator 44 via potentiometer 42 to allow for carrier frequency value; the indicator may be an A.C. voltmeter with cosinelaw calibration marks and reading directly in elevation.

    293.
    发明专利
    未知

    公开(公告)号：FR1248659A

    公开(公告)日：1960-12-23

    申请号：FR810748

    申请日：1959-11-20

    Applicant: SERVO CORP OF AMERICA

    IPC: G01S1/40

    294.
    发明专利
    未知

    公开(公告)号：FR1199244A

    公开(公告)日：1959-12-11

    申请号：FR1199244D

    申请日：1957-11-06

    Applicant: SERVO CORP OF AMERICA

    IPC: B61K9/06 ,  B61L1/20

    Abstract: 820,919. Hot-axle detectors. SERVO CORPORATION OF AMERICA. Nov. 6, 1957 [Nov. 6, 1956; Aug. 6, 1957], No. 34657/57. Class 40 (3). A detector for the hot axle bearings of rail wagons comprises a heat-responsive control element, e.g. an infra-red detecting thermistor, mounted alongside the track, and an inclined optical system with its axis preferably at 20- 50 degrees to the horizontal and in a plane parallel to the rail track. There may be two such systems pointing in opposite directions with trip means operating shutters appropriate to the direction of movement of the wagons. There may be two heat detectors with separate optical systems, or a single detector with a mirror operated by the trip means, to incline in the receiving direction and reflecting the heat on to the detector. Alternatively, the shutters are controlled and held by the trip means. The journal box 18 is progressively scanned by the detector 10 as the rail car 19 moves along the track 13. The wheel trip 34 maybe a magnetic circuit closed by the wheel flange 25 and in a circuit containing a single-stability multivibrator or a time-delay grop-out relay giving a gate interval for the detector of about 50 milliseconds, sufficient even for slow trains of 5 m.p.h. A storage device in conjunction with the wheel trip operates the shutter of the detector for a sufficient period when the train is slow. Two wheel trips in series with a flip-flop circuit give a square gating pulse sufficient for full exposure of the hot box (Fig. 6, not shown). A single detector cell 14 (Fig. 8) serves duplicate optical systems 44, 44 , with shutters 51, 52 operated by solenoids 53, 54. The sequence in which the wheel trips 34, 56 are operated affects the directionally responsive switch 74 which determines the actuation of the solenoid and storage means 38, 38 , supplies a steady signal to relay means 76 to control the trip pulses, and turns on the recorder, alarm and telemetering devices 30, 31, 32.

    ON-LINE ACOUSTIC DETECTION OF BEARING DEFECTS
    298.
    发明专利
    ON-LINE ACOUSTIC DETECTION OF BEARING DEFECTS 未知

    公开(公告)号：GB2209397B

    公开(公告)日：1991-12-11

    申请号：GB8815142

    申请日：1988-06-24

    Applicant: SERVO CORP OF AMERICA

    Inventor： BAMBARA JOSPEH E ,  FRAREY JOHN L ,  SMITH RICHARD L

    IPC: B61K9/04 ,  G01N29/14

    Abstract: This invention relates to apparatus for the detection of accustic impact frequencies, characteristic of bearing assembly failure during operation, which modulate an acoustic carrier frequency band. This apparatus allows for on-site or field application with high-level of ambient noise such as are present in railroad yards. This apparatus allows for early detection of such failures, so that a repair may be made before damaging heat build-up or catastrophic bearing failure occurs. Additionally, with sufficient early warning in railroad applications, a train may continue running to a railyard for convenient shop repair rather than expensive field repair.

    Bearing defect detector
    299.
    发明专利
    Bearing defect detector 未知

    公开(公告)号：GB2233761A

    公开(公告)日：1991-01-16

    申请号：GB9004343

    申请日：1990-02-27

    Applicant: SERVO CORP OF AMERICA

    Inventor： BAMBARA JOSEPH E

    IPC: B61K9/04 ,  G01H1/00 ,  G01H3/08 ,  G01N29/14 ,  G01N29/38

    Abstract: An acoustic system for detecting defects in the bearings of moving railroad cars and identifying the location of these defects has means for opening a window on detection of a wheel passing a particular point such that signals received relate only to the bearing and extraneous signals are excluded.

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