Document Number 208 SLIP RINGS AND TWIST CAPSULES

2y ago
47 Views
10 Downloads
357.44 KB
5 Pages
Last View : 18d ago
Last Download : 2m ago
Upload by : Jenson Heredia
Transcription

SLIP RINGS AND TWIST CAPSULESFor E-O SENSOR SYSTEMSDocument Number 208Glenn Dorsey, P.E.Slip Ring Product Line ManagerABSTRACTThe dramatic increase in numbers and sophistication ofelectro-optic sensor systems has led to majordevelopments in the hardware that is associated withthis technology. Moog Components Group (MCG) hassupported EO system development with improvementsin slip rings, twist capsules, fiber optic rotary joints andmultiplexing technologies. MCG has participated in thedevelopment of many of the major airborne and groundbased EO systems and this Application Note is intendedto outline this experience and heritage as well asprovide a brief overview of the technologies available toEO designers for transferring data and power acrossrotating interfaces.capsule on the elevation, pitch, or yaw axes wherelimited rotation is sufficient.Slip Rings: Slip ring assemblies provide the functionalityof a continuously rotating electrical interface. Theseassemblies contain discrete noble metal rings for eachelectrical circuit and corresponding sliding wipers (orbrushes) to conduct the power and signals from theDESCRIPTIONElectro-Optic sensors or sensor suites are normallyhoused in a gimbaled assembly. These systems aretypically scanning systems and require the transmissionof power and data to and from the scanning sensor(s).Figure 2: Noble metal ring and brushconstructionFigure 1: Typical Gimbaled EO SystemThis transmission is accomplished by a slip ring in thecase of continuous rotation or a twist capsule in thecase of limited rotation.The most commonconfiguration is a slip ring on the azimuth or roll axiswhere continuous rotation is often desired, and a twist 2006 Moog, Inc. 11-01-06www.moog.com/componentsFor more information: mcg@moog.comrotating rings to the stationary member (Figure 2). Theslip rings used for the sensor gimbals typically requirevery dense circuit packaging to meet very stringent sizerequirements. The most slip ring requirements for sliprings in EO applications have developed around theneed to transmit high speed digital data for FLIR andday video.Twist Capsules: In most cases gimbaled EO systemsrequire continuous, unlimited rotation on just one axis,typically the azimuth or roll axis. Normally the other1

axes (pitch, elevation, or yaw), require only limitedrotation, i.e., less than 360 degrees. This allows theuse of a twist capsule, or Poly-Twist, to transmitelectrical power and signals. By the use of wrappingflexible circuits, the twist capsule designer is able toincrease circuit density, decrease weight, and improvesystem reliability over traditional cable wraps. The longlife, low and consistent torque, and the small size maketwist capsules the best solution for scanning, or limitedrotation axes in EO systems.Figure 4: Harnessed Twist Capsule AssemblyFigure 3: Wrapping Flexible Circuits of a TwistCapsuleThe stress on the flexible circuit is well below itsendurance stress limit producing very low torque levelsand very long operational life. A twist capsule isfrequently used as a substitute for a cable wrapproviding a very size and weight efficient alternative. Inaddition the reproducible and dependable torquecharacteristics of a twist capsule result improved servocontrol on the selected axis.Fiber Optic Rotary Joints (FORJ): In the case of systemsthat utilize optical fiber to carry high-speed data, themost straightforward rotational interface is a passivefiber optic rotary joint (FORJ). These devices arecharacterized by the numbers of optical fibers that arecarried through on discrete physical fibers (passes) andby whether the fibers are single or multi-mode. Forexample, a single pass, multi-mode FORJ contains onediscrete multi-mode fiber channel. These devices arebi-directional and their performance parameters areindependent of the direction of the signal. The size ofthe single channel FORJ is quite small (see Figure 5)with the length of less than 15 mm and the diameterControlled impedance flex tape lines can be used tocontrol impedance on video and high speed data lines.Coaxial cables and optical fibers can be integrated intothe design in special cases.This allows thetransmission of high speed digital data on both opticaland copper media.Figure 5: Single channel FORJ 2006 Moog, Inc. 11-01-06www.moog.com/componentsFor more information: mcg@moog.com2

less than 10 mm. The environmental robustness ofthese devices has been well proven in military as well asharsh commercial marine environments.vehicle uses Moog’s slip ring on the azimuth axis of it’sCommander’s Independent Viewer (CIV) and a twistcapsule on the elevation axis.The single and dual channel FORJ’s are powerful toolsfor “futureproofing” any rotary data interface. Thesesimple and compact devices provide a data bus for dataat speeds of well over 20 Gbps, allowing a convenientupgrade path for years to come.Although FORJtechnology exists for 3 or more optical channels, thesize of these devices preclude their use in most EOgimbals.Requirements for EO sensors are especially critical inUnmanned Ground Vehicles (UGV) since these systemsmust incorporate driver replacement sensors. The USArmy Tank and Automotive Research, Development andEngineering Center (TARDEC) outlines the sensorsystems required for Unmanned Ground Vehicle (UGV)technology as shown in Table 1. These sensor systemsnormally require some power, but the video and datarequirements are typically the significant design featuredue to the data requirements of the sensor detectors ordetector arrays. These detectors often need coolingfluid and the systems need precise positionalinformation, therefore the rotary interface often includesfluid rotary unions and rotary position feedback devices.As sensor systems become more sophisticated and thedigital battlefield continues to push for greaterinformation density, system architects are starting toview the rotational interface as a potential bottleneckfor data flow. Of course not all network data must goonto these rotating platforms, but in most systemsthere must be data communication between the sensorand the main platform. The reader is referred to MoogComponents Group Application Note 204 on High SpeedData for a more detailed discussion of the high speeddata options available for these systems.GROUND BASED SENSORSThe best example of ground based EO systemssupported by Moog is the Abrams Tank Commander’sIndependent Thermal Viewer (CITV). The CITV hasused an MCG slip ring assembly to allow continuousrotation on the azimuth axes since the program’sinception in the late 1980’s. A number of slip ringupgrades has allowed system improvements over the15 years of this program. The Bradley armoredTABLE 1:Unmanned Ground Vehicle (UGV)Sensor ht stereo vision;Scanning laser range-finder;Two radar systems (4GHz radar topenetrate vegetation, and 77 GHz radarfor imaging obstacles at longer ranges)Multi-spectral imagerPolarizing imagerSmall ultrasonic sensors (for close-insafeguarding functions)TV cameraHigh resolution forward-looking infrared(FLIR) sensor;Laser range-finder/designator;An array of acoustic sensorsUndefined* Reconnaissance, Surveillance, and Target AcquistionThe chart in Table 2 below shows the major productionarmored vehicle EO systems for which Moog producesslip rings or twist capsules.Figure 6: Slip Ring used in Military VehicleCommander's Viewer (CITV) 2006 Moog, Inc. 11-01-06www.moog.com/componentsFor more information: mcg@moog.com3

Table 2: MCG Production Armored Vehicle ThermalViewer ProgramsBradley CIVAbrams CITVSlip Ring and TwistCapsuleSlip RingStryker MGS ThermalViewerSGTS/ KEOTSSlip RingVBCI--Sagem MPS (MultiPurpose Sight)Korean K-1Slip RingTwist CapsuleLemur SightSlip RingSlip RingAIRBORNE SYSTEMSMoog Components Group’s slip rings and twist capsulesare used extensively in airborne EO systems. The latestupgrade to the F-18 Hornet’s EO targeting pod, ATFLIR,utilizes a Moog slip ring to allow continuous rotation inthe roll axis and a twist capsule for scanning, or limitedrotation, in the elevation and yaw axes. The LANTIRNand its successor Sniper used for EO targeting andnavigation on the F-16 uses Moog slip rings and twistcapsules exclusively.The Predator UAV, LAMPShelicopter, and Apache helicopter all “see in the dark”using Moog Components Group slip ring and twistcapsules. Table 3 shows just some of the E-O systemsthat contain Moog Components Group slip rings andtwist capsules.Table 3: AIRBORNE E-O SYSTEM HARDWARELamps Helicopter FLIR(AN/AAQ-27)Night Hawk FLIR AN/AAS38AN/AAQ-26 FLIR (AC 130)Slip Ring, Twist CapsulesATIRCM (InfraredCountermeasure)LANTIRN AN/AAQ-13 andAN/AAQ-14Sniper (AN/AAQ-38)Slip Ring, Twist CapsulesApache ArrowheadTwist CapsulesF117 IRADSTwist CapsulesATFLIR (AN/ASQ-228)PodPredator MTS (MultiSpectral TargetingSystem) AN/AAS 52IFTS (AN/AAQ-32)Slip Ring, Twist CapsuleAN/AAQ 15/17Twist CapsulesSAFIRE NTIS (AN/AAQ22)Multi-Sensor TurretAN/AAQ 35F35 (JSF) EOTSSlip RingASELFLIR 200Slip Ring and TwistCapsulesTwist CapsulesSlip Ring, Twist CapsuleSlip Ring, Twist CapsulesSlip Ring, Twist CapsulesSlip Ring, Twist CapsuleSlip ringSlip RingSlip RingLow Profile Azimuth Slip RingsHigh Speed DataSystem height is often the primary concern of the EOgimbal designer. Moog Components Group has thesolution with its patented broadband platter slip ringdesign. This broadband technology allows the slip ringdesigner to package multiple high speed data lines onslip ring platters, and then “stack” these platters withtheir accompanying brush blocks into a very low profiledesign. Power rings as well as discrete signals andvideo can also be placed on these slip ring platters.This has led to a dramatic decrease in typical slip ringheight or length over traditional slip ring “drum-style”designs.The dramatic improvement in image definition, the useof multi-sensors, and increased communicationrequirements have driven the need for EO Systems tosignificantly increase transmission speeds of datachannels with every generation of upgrade. MCG hasproduced EO slip rings and twist capsules that handle asmany as two dozen data channels at over 400 Mbpseach, for an aggregate bandwidth of 12 Gpbs. Slipring/fiber optic rotary joint hybrid designs contain bothcopper lines for power and signals, as well as fiber linesfor fiber optic signals. 2006 Moog, Inc. 11-01-06www.moog.com/componentsFor more information: mcg@moog.com4

Figure 7: Example of Low Profile, Platter SlipRingDesign and manufacturing techniques have beendeveloped and patented that increase signal bandwidthwhile controlling crosstalk and EMI/EMC. A range ofsolutions is available to handle data channels such asGigE, Fibre Channel, and IEEE1394 to name just a few.These high speed data solutions are being used inexisting EO systems. 2006 Moog, Inc. 11-01-06www.moog.com/componentsFor more information: mcg@moog.com5

Moog Components Group’s slip rings and twist capsules are used extensively in airborne EO systems. The latest upgrade to the F-18 Hornet’s EO targeting pod, ATFLIR, utilizes a Moog slip ring to allow continuous rotation in the roll axis and a twist capsule for scanning, or lim

Related Documents:

black velvet alannah myles 208 13 who knew pink 208 13 believe cher 208 13 gimme hope joanna eddy grant 208 13 shine years & years 208 13 metulji pliŠ 208 13 words boyzone 208 13 ivona djavoli 208 13 rise gabrielle 208 13 hotel california eagles 208 13 under the bridge re

Approved under MIL-PRF-23699F Class STD specification, US Navy. 18 kg OEM approvals include General Electric, Rolls Royce (Allison), Centrax, Rolls Royce (Derby). Bulk 208 L 208 L 208 L 208 L 208 L 20 L 208 L Bulk 1,000 L 208 L IBC Chevron Global Lubricants’ scientists and engineers wor

2.4 Homomorphism and quotient rings 28 2.5 Special rings 30 2.6 Modules 34 2.7 Rings with chain conditions 35 3. Smarandache rings and its properties 3.1 Definition of Smarandache ring with examples 38 3.2 Smarandache units in rings 41 3.3 Smarandache zero divisors in rings 46

Heavy Duty Back-Up Rings Heavy Duty back-up rings are configured with a greater axial thickness (T) dimension. The extra thickness provides more extrusion protec-tion for O-Rings. These rings are interchange-able with MS27595, MS28774, MS28782 and MS28783 back-up rings used in MIL-G-5514 packing glands. Heavy duty rings are available

MOOG COMMERCIAL - INDUSTRIAL SLIP RINGS Moog SRA-73540 Compact Slip Ring Capsule Moog SRA-73625 Compact Slip Ring Capsule Moog AC6373 Compact Slip Ring Capsule Moog SRA-73762 Compact Slip Ring In Various Circuit Configurations P r o d u c t s & S e r v i c e s. MOOG

gear, slip-rings, external rotor resistances etc. A squirrel cage motor is thus preferred to a slip-ring motor. A slip-ring motor also requires a larger space for the motor and its controls. 5.2 Starting of slip-ring motors These can be started by adopting either a ‘current limiting’ .

Video Signals and Slip Rings Glenn Dorsey Moog Inc. Business Development Specialist www.moog.com Figure 1a: Capsule assemblies. 2 Video Signals and Slip Rings Capsule Assemblies (Figure 1a) Sli

Adolf Hitler revealed everything in Mein Kampf and the greater goals made perfect sense to the German people. They were willing to pursue those goals even if they did not agree with everything he said. History can be boring to some, but do not let the fact that Mein Kampf contains a great deal of history and foreign policy fool you into thinking it is boring This book is NOT boring. This is .