Showing papers on "Disk loading published in 2006"

Challenges Facing Future Micro-Air-Vehicle Development

Abstract: Nomenclature Ar = rotor disk area CD = sectional drag coefficient CD0 = zero-lift drag coefficient Clα = lift-curve slope CP = power coefficient CPi = induced power coefficient CP0 = profile power coefficient CT = thrust coefficient c = chord length D = drag force D.L . = disk loading L = lift force m = mass P.L . = power loading SF = separated flow T = rotor thrust V = local wind velocity perceived by flap W = weight W f = final weight Wo = gross takeoff weight α = blade section angle of attack η = efficiency μ = dynamic viscosity ρ = air density σ = rotor solidity = flapping amplitude (peak to peak)

Designs and Technology Requirements for Civil Heavy Lift Rotorcraft

Abstract: The NASA Heavy Lift Rotorcraft Systems Investigation examined in depth several rotorcraft configurations for large civil transport, designed to meet the technology goals of the NASA Vehicle Systems Program. The investigation identified the Large Civil Tiltrotor as the configuration with the best potential to meet the technology goals. The design presented was economically competitive, with the potential for substantial impact on the air transportation system. The keys to achieving a competitive aircraft were low drag airframe and low disk loading rotors; structural weight reduction, for both airframe and rotors; drive system weight reduction; improved engine efficiency; low maintenance design; and manufacturing cost comparable to fixed-wing aircraft. Risk reduction plans were developed to provide the strategic direction to support a heavy-lift rotorcraft development. The following high risk areas were identified for heavy lift rotorcraft: high torque, light weight drive system; high performance, structurally efficient rotor/wing system; low noise aircraft; and super-integrated vehicle management system.

Disk drive device having a motor, and manufacturing method of the motor

Abstract: An inner rotor type motor includes a turn table having a disk loading portion and a central opening portion arranged to allow a disk to be attached thereto and removed therefrom, a rotor concentric with a rotation axis of the turn table, the rotor including a rotor holder having therein a rotor magnet and a cylindrical portion arranged to retain on an outer circumferential surface thereof the rotor magnet, and a stator having an armature arranged to oppose an outer circumferential surface of the rotor magnet via a gap therebetween. The turn table is affixed in an axial direction on an upper portion of the rotor holder, and the disk loading portion is arranged radially outside the cylindrical portion of the rotor holder. A disk loading surface of the disk loading portion is arranged to make contact with the disk, and a bottom portion of the disk loading portion is arranged axially below an area where the turn table and the rotor holder make contact with one another. The disk loading portion has a predetermined thickness in the axial direction, thereby preventing a deformation of the disk loading portion even when the disk is placed thereupon.

Method for checking disk loading status in optical disk driver

Abstract: A method for checking a disk loading status in an optical disk driver including the steps of: discriminating a loading status of an optical disk during multiple loading stages of the disk; transmitting information to a host connected through an interface to the optical disk driver in case that disk has been jammed upon discrimination; and performing disk-ejection operation according to a disk ejection command received from the host, wherein in the step of discriminating the loading status of an optical disk by during multiple loading stages of the disk, a loading status of an optical disk is discriminated on the basis of sensing signals respectively outputted from a plurality of optical sensor for sensing a size of the optical disk and from a loading switch for sensing whether the optical disk has been clamped.

Disk loading device having a lift frame protrusion

Abstract: A disk unit wherein a disk inserted by a plurality of arms, the arms being able to convey the disk while supporting an outer periphery edge of the disk, is loaded to the interior of the disk unit or the disk accommodated in the interior of the disk unit is unloaded to the exterior of the disk unit, wherein a turntable for rotating the disk in a fixed state of the disk thereto is provided on a vertically movable lift frame and when the disk is inserted from a disk inlet in an initial descended state of the lift frame, a rear end portion of the disk is lifted and conducted to a holder of a disk supporting arm

Removable hard disc loading device

Abstract: A removable hard disk loading device includes a hard disc tray including a first loading place for placing a hard disk of a first size, and an accessory capable of being placed in the first containing place, wherein the accessory includes a second loading place for placing a hard disk of a second size.

Optimum Design of a Compound Helicopter

Abstract: A design and aeromechanics investigation was conducted for a 100,000-lb compound helicopter with a single main rotor, which is to cruise at 250 knots at 4000 ft/95 deg F condition. Performance, stability, and control analyses were conducted with the comprehensive rotorcraft analysis CAMRAD II. Wind tunnel test measurements of the performance of the H-34 and UH-1D rotors at high advance ratio were compared with calculations to assess the accuracy of the analysis for the design of a high speed helicopter. In general, good correlation was obtained when an increase of drag coefficients in the reverse flow region was implemented. An assessment of various design parameters (disk loading, blade loading, wing loading) on the performance of the compound helicopter was conducted. Lower wing loading (larger wing area) and higher blade loading (smaller blade chord) increased aircraft lift-to-drag ratio. However, disk loading has a small influence on aircraft lift-to-drag ratio. A rotor parametric study showed that most of the benefit of slowing the rotor occurred at the initial 20 to 30% reduction of the advancing blade tip Mach number. No stability issues were observed with the current design. Control derivatives did not change significantly with speed, but the did exhibit significant coupling.

Disk loading device and disk device

Abstract: A disk loading device has a drive roller (6) that rotates and also has a disk guide (8) for holding an optical disk (3) between itself and the drive roller (6). The disk guide (8) has pressing sections (8a, 8b, 8c, 8d) placed facing the drive roller (6), rocking shafts (8e, 8f) supported by bearing sections (11a, 11b), and springs (10a, 10b) for urging the disk guide (8) toward the drive roller (6). The bearing sections (11a, 11b) support the rocking shafts (8e, 8f) so that the inclination of the disk guide (8) relative to the rotation axis of the drive roller (6) is variable.

Reproducing method and device matching kind of medium

Abstract: PROBLEM TO BE SOLVED: To automatically switch the current drive to start the predetermined operation (reproduction start or the like) by detecting the state of the medium to use (disk loading or the like). SOLUTION: This reproducing device switches the current drive in the device having a hard disk and an optical disk as a recording medium (ST903), and/or makes the predetermined operation relevant to the recording medium (ST904) corresponding to the kind (rewritable or not) of the medium loaded in the device (ST902). COPYRIGHT: (C)2007,JPO&INPIT

Disk recorder and player

Abstract: The invention provides a disk recorder and player having a disk loading tray capable of mounting both large-diameter and small-diameter disks, wherein especially the small-diameter disk mounted on the disk loading tray is prevented from popping out and slipping into the disk recorder and player. A disk stopper projection composed of a notch portion, a supporting portion and a bent portion is formed near a large-diameter inner wall of the disk loading tray. Thereby, when a small-diameter disk mounted on a predetermined position on the disk loading tray is displaced, the disk stopper projections prevent the disk from falling, so as to prevent malfunction of the disk recorder and player caused by the small-diameter disk falling into the recorder and player.

Rotor disk of gas-turbine engine (versions)

Abstract: FIELD: mechanical engineering; gas-turbine engines ^ SUBSTANCE: proposed rotor disk of gas-turbine engine contains row of ring hubs surrounding central line Each hub is connected with disk rim by bridge Great number of dovetail slots spaced circumference pass between posts of disk in axial direction from front end to rear end of disk rim and in radial direction, inwards from outer surface of disk rim To prevent breaking, ring slots pass over circumference in radial direction through rim in dovetail slots between each two adjacent bridges In typical design version, dovetail slots are made arc-shaped Overhand projecting forward in axial direction is arranged radially outwards on each of disk posts, and bevel is found on part of overhand of each of disk post radially to outer angle Great number of holes of posts pass in axial direction back to rim, each hole in post passes in axial direction back into corresponding post of disk ^ EFFECT: possibility of making fan disk unit for smaller radius hub which includes arc-shaped root and dovetail slot to provide adequate area of support and disk loading paths ^ 22 cl, 27 dwg

Disk loading device

Abstract: PROBLEM TO BE SOLVED: To provide a disk loading device in which the stability for centering action can be inexpensively enhanced only by modifying the shape of a guide groove without adding excess components and complicate structures. SOLUTION: The disk loading device is provided with a feed roller 2, a disk arm 4 moved back and forth between an initial position to accept a disk 100 drawn by the feed roller 21 and a retreat position corresponding to a chucking position of the disk 100, and the guide groove 5. The device is provided with a function for the feed roller 2 to center the disk 100. The guide groove 5 is provided with an inclined wall surface 57 for gradually narrowing the groove width toward the forward moving direction of the disk arm 4 and a receiving surface 58 for regulating the inclination angle of the disk arm 4. COPYRIGHT: (C)2008,JPO&INPIT

Loading device, disk drive and loading method

Abstract: A loading device (11) for loading a disk (22) by a slot system, comprising an insert/eject mechanism (30), a retreat mechanism (35), and a control section (40) The insert/eject mechanism (30) moves a disk inserted into a slot (21) up to a loading position The retreat mechanism (35) moves the disk loaded at the loading position to a retreat position When a new disk is inserted, the control section (40) drives the retreat mechanism (35) in order to move the disk loaded at the loading position to the retreat position, and drives the insert/eject mechanism (30) in order to move the new disk up to the loading position when movement to the retreat position is completed Consequently, troublesomeness of disk loading procedure is eliminated

Disk unit and disk ejection method

Abstract: PROBLEM TO BE SOLVED: To surely eject a disk from a slot loading type disk unit with a simple operation. SOLUTION: The disk unit into which the disk is directly inserted in the front face of chassis coating 23 is equipped with a disk ejection means 44 to release the loading status of a disk from a spindle motor 31 and eject the disk outside the disk unit, a disk ejection status detection means 45 which detects the status that disk is ejected, and a disk loading standby detection means 25 which detects the status that loading action of the disk is possible. COPYRIGHT: (C)2007,JPO&INPIT

Disk loading device and rotating cam device

Abstract: PROBLEM TO BE SOLVED: To provide an inexpensive and thin disk loading device with fewer numbers of parts. SOLUTION: The device has multiple tray units which can move between a first position where the disk can be unloaded or loaded, a second position where the disk is accommodated and waits and a third position where the disk can be reproduced. The tray units are: arranged overlapping each other; each equipped with a first tray movable between the first position and the second position, respectively, and a second tray movable between the second position and the third position when the first tray is in the second position; equipped with a tray drive unit for driving the first tray and the second tray. The device has a disk reproduction means for reproducing the disk, the disk reproduction means moving means for moving up and down or turning the disk reproduction means, a first control means for controlling reciprocation between the first position and the second position of the tray unit, the reciprocation between the second position and the third position of the second tray and operation of the disk reproduction means moving means, and a second control means to control vertical movement of the disk reproduction means and vertical movement of each drive source of the first tray drive means and the second tray drive means. COPYRIGHT: (C)2006,JPO&NCIPI

Disk apparatus and initialization method of disk apparatus

Abstract: PROBLEM TO BE SOLVED: To initialize a disk apparatus of a slot loading system directly after a power source is turned on to smoothly boot up the disk apparatus. SOLUTION: In the disk apparatus, a disk loading port 11 for directly loading a disk is disposed on a front surface of a chassis outer casing 23 constituted of a base body 10 and a lid body 19, a traverse 30 and a printed board 14 are provided in the base body 10 and a spindle motor 31, a pickup 32 and a driving means 33 transferring the pickup 32 are held by the traverse 30. Whether the disk exists in the disk apparatus is judged, spin-up process is performed when the disk exist and disk ejection operation is performed until a disk ejection state detecting means 45 detects a disk ejection state and a disk loading means 26 or a disk ejecting means 44 is made to operate until a disk loading waiting state is detected when the disk does not exist. COPYRIGHT: (C)2007,JPO&INPIT

Disk reproducer for vehicle

Abstract: PROBLEM TO BE SOLVED: To provide a disk reproducer capable of loading and unloading a disk and moving a pickup using a single driving motor. SOLUTION: The disk reproducer comprises: the driving motor which operates when a disk is present; a first rotary unit which rotates while being coupled to the driving motor; a second rotary unit which moves a pickup moving unit; a third rotary unit rotated when loading and unloading the disk, and stopped when driving the pickup moving unit; a switchable rotator for switching a rotational force of the first rotary unit to the second rotary unit or to the third rotary unit; a fourth rotary unit selectively coupled to the third rotary unit, rotated and inversely rotated to entrance and leaving of the disk when loading and unloading the disk, and stopped during a final stage of disk loading; a rotary switching member, on which the third rotary unit is mounted so as to be rotated, coupling or decoupling the third rotary unit and the fourth rotary unit during disk loading and unloading and during a final stage of disk loading. COPYRIGHT: (C)2006,JPO&NCIPI

Disk loading mechanism

Abstract: PROBLEM TO BE SOLVED: To surely stop a disk by ejecting the disk up to a position at which the center hole of the disk can be grabbed with fingers when the disk is ejected. SOLUTION: This disk loading mechanism is provided with a holder (40) supported in a vertically movable way with respect to a base and while pressed in the direction of approaching the base, a holding member (80) for holding the holder at an ascending position, a pair of left and right dragging-in arms (50a and 50b) for dragging the disk into the holder while the disk is carried in, an ejection arm (60) for ejecting the disk from the holder while the disk is carried out, a sliding member (70) for giving rotating force in the direction of dragging the disk in to the dragging-in arms by sliding in an energizing direction, and a tray (45) attached with energizing force given movably in the direction of ejecting the disk outward from the holder and in the opposite direction. When the ejection arm is turned to eject the disk from the holder outward during carrying the disk out, the disk pushes the tray (45) from the holder (40) outward up to a prescribed position in the direction of ejecting the disk. COPYRIGHT: (C)2007,JPO&INPIT

Disk loading apparatus

Abstract: There is provided a disk loading apparatus capable of centering and loading a disk reliably with a simple structure. There is provided an anti-sinking rib protruding forward from the outer peripheral surface in the lower end portion of each boss of a disk stopper 6, that is, toward an insertion slot 4 a. That is, anti-sinking ribs 6 aa, 6 ba, and 6 da are provided, respectively, on the bosses 6 a, 6 b, and 6 d. These anti-sinking ribs have a function of receiving the inserted disk at the lower end portion of each boss so that the disk may not get into under the disk stopper 6.

Disk-shaped storage medium loading/ejection mechanism, disk device, and disk autochanger

Abstract: A disk loading/ejection mechanism in a disk device inserting and taking out a disk-shaped storage medium (disk D) through an opening and enabling a combined relatively large space to be secured inside the disk device, provided with an offset drive function unit for shifting the loading/ejection direction when inserting and taking out the disk D to a loading/ejection direction (B) offset from the straight direction (A) perpendicularly intersecting the opening direction of the opening.

Disk driving device and disk recording and/or reproducing device

Abstract: PROBLEM TO BE SOLVED: To solve the problem that there is the possibility of generating an abnormal sound or damaging the surface of the optical disk by coming a rotary-driven optical disk into contact with surrounding mechanical components in a conventional thin disk driving device. SOLUTION: The disk driving device includes a casing 11, a disk conveying mechanism 30, a rotary-driving mechanism 41, an optical pickup 42, a pickup moving mechanism 43, a base member 40, a base moving mechanism 83, and a posture adjusting mechanism 90. A disk insertion port 24 for inserting/ejecting an optical disk 7 is provided in the casing. The disk conveying mechanism, conveys an optical disk between a disk ejecting position and a disk loading position. The rotary-driving mechanism is provided with a disk loading part, and rotates the optical disk. The optical pickup records/reproduces an information signa. The pickup moving mechanism moves the optical pickup. The rotary-driving mechanism, the optical pickup, and the pickup moving mechanism are mounted on the base member. The base moving mechanism supports the base member to change a posture. The posture adjusting mechanism adjusts the posture of the base member with respect to the casing. COPYRIGHT: (C)2008,JPO&INPIT

Preliminary Experimental Investigation on Autorotation Performance of Scale Model Helicopter in Vertical Manoeuvre

Abstract: This paper presents the results of the preliminary experimental investigation of reducing the steady rate of descent of a typical helicopter in vertical autorotation. Test data for two types of blades with different driving region areas were obtained. Results were summarized for zero collective pitch, same disk loading and same mass moment of inertia. The results of this preliminary test indicated that the expanding of the driving region area did reduce the steady rate of descent in vertical autorotation slightly and in agreement with the corresponding theoretical values. Further experimental investigation will be conducted looking for suitable driving region areas and collective pitch conditions that will give the reduction in the steady rate of descent significantly for ensuring safe landing condition.

Aeromechanics Analysis of a Compound Helicopter

Abstract: A design and aeromechanics investigation was conducted for a 100,000-lb compound helicopter with a single main rotor, which is to cruise at 250 knots at 4000 ft/95 deg F condition Performance, stability, and control analyses were conducted with the comprehensive rotorcraft analysis CAMRAD II Wind tunnel test measurements of the performance of the H-34 and UH-1D rotors at high advance ratio were compared with calculations to assess the accuracy of the analysis for the design of a high speed helicopter In general, good correlation was obtained with the increase of drag coefficients in the reverse flow region An assessment of various design parameters (disk loading, blade loading, wing loading) on the performance of the compound helicopter was made Performance optimization was conducted to find the optimum twist, collective, tip speed, and taper using the comprehensive analysis Blade twist was an important parameter on the aircraft performance and most of the benefit of slowing the rotor occurred at the initial 20 to 30% reduction of rotor tip speed No stability issues were observed with the current design and the control derivatives did not change much with speed, but did exhibit significant coupling