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Qualifier for the rated speed of an optical disc drive
In optical storage, constant angular velocity (CAV) is a qualifier for the rated speed of any disc containing information, and may also be applied to
Constant_angular_velocity
Direction and rate of rotation
kinematics, angular velocity (symbol ω or ω → {\displaystyle {\vec {\omega }}} , the lowercase Greek letter omega), also known as the angular frequency
Angular_velocity
Qualifier for the rated speed of an optical disc drive
applied to the writing speed of recordable discs. CLV implies that the angular velocity (i.e. rpm) varies during an operation, as contrasted with CAV modes
Constant_linear_velocity
Disk drive optimization method
rate (constant linear velocity), the data rate (with constant angular velocity) or a combination of both (using zoned constant angular velocity). On a
Zone_bit_recording
Mechanisms for smoothly transmitting rotation through a bend in a drive shaft
A constant-velocity joint (also called a CV joint and homokinetic joint) is a mechanical connection between two rotating shafts, that keeps them rotating
Constant-velocity_joint
Digital optical disc data storage format
either constant angular velocity (CAV), constant linear velocity (CLV), Partial constant angular velocity (P-CAV) or Zoned Constant Linear Velocity (Z-CLV
DVD
Physical quantity
angular acceleration (symbol α, alpha) is the time derivative of angular velocity. Following the two types of angular velocity, spin angular velocity
Angular_acceleration
Shape of a spinning body of self-gravitating fluid
self-gravitating fluid body of uniform density rotates with a constant angular velocity. This spheroid is named after the Scottish mathematician Colin
Maclaurin_spheroid
Speed and direction of a motion
and direction. To have a constant velocity, an object must have a constant speed in a constant direction. Constant direction constrains the object to
Velocity
The angular velocity tensor is a skew-symmetric matrix defined by: Ω = ( 0 − ω z ω y ω z 0 − ω x − ω y ω x 0 ) {\displaystyle \Omega ={\begin{pmatrix}0&-\omega
Angular_velocity_tensor
Optical Storage Speeds
Original CD-ROM drives could read data at about 150 kB/s, 1× constant angular velocity (CAV), the same speed of compact disc players without buffering
Optical storage media writing and reading speed
Optical_storage_media_writing_and_reading_speed
Automotive transmission technology
CVT with suitable control may allow the engine to operate at a constant angular velocity while the vehicle moves at varying speeds. Thus, CVT has a simpler
Continuously variable transmission
Continuously_variable_transmission
is a curve on a sphere made by moving on the sphere with constant speed and angular velocity with respect to a fixed diameter. If the selected diameter
Seiffert's_spiral
Spiral with constant distance from itself
moving away from a fixed point with a constant speed along a line that rotates with constant angular velocity. Equivalently, in polar coordinates (r
Archimedean_spiral
Shape taken by a self-gravitating fluid body rotating at constant velocity
self-gravitating, fluid body of uniform density rotates with a constant angular velocity. It is named after the German mathematician Carl Gustav Jacob
Jacobi_ellipsoid
LaserDisc-based read-only memory format
early 1980s. Similar to standard-play LaserDiscs, LV-ROM used constant angular velocity (CAV) playback, with analog video encoded using pulse-width modulation
LV-ROM
When the angular frequency of a system matches its natural vibrational frequency
at a constant angular velocity. The angular velocity of the motion with respect to the rotating coordinate system is 2ω, twice the angular velocity of the
Rotational–vibrational coupling
Rotational–vibrational_coupling
Rate at which the phase of the wave propagates in space
The phase velocity of a wave is the speed of any wavefront, a surface of constant phase. This is the velocity at which the phase of any constant-frequency
Phase_velocity
Mathematical formula for viscous fluid
characterized by an azimuthal velocity Ω r {\displaystyle \Omega r} , where Ω {\displaystyle \Omega } is the constant angular velocity, the parameter Ω = Γ /
Rankine_vortex
Conserved physical quantity; rotational analogue of linear momentum
because it is a conserved quantity – the total angular momentum of an isolated system remains constant. Angular momentum has both a direction and a magnitude
Angular_momentum
Term from classical mechanics
multiplicative scalar constant, equal to the areal velocity of the object about the same origin. A crucial property of angular momentum is that it is
Areal_velocity
Equations that describe the behavior of a physical system
α is the constant angular acceleration, ω is the angular velocity, ω0 is the initial angular velocity, θ is the angle turned through (angular displacement)
Equations_of_motion
Type of coupling
following: Offset Couplings: Schmidt couplings which transmit constant angular velocity and torque in a wide range of parallel shaft misalignment. Semi
Schmidt_coupling
Removable disk storage medium
standard controller. Constant linear velocity was generally not used on floppy disks, so most computer systems used constant angular velocity (CAV) format, with
Floppy_disk
Unit of rotational speed
distinct quantity for describing rotation is angular frequency (or angular speed, the magnitude of angular velocity), for which the SI unit is the radian per
Revolutions_per_minute
Family of linear transformations
motion with constant velocity) and non-inertial (accelerating, moving in curved paths, rotational motion with constant angular velocity, etc.). The term
Lorentz_transformation
Floppy disk drive for the Commodore 64
17 to 21 (an early implementation of zone bit recording with 4 constant angular velocity zones). The drive's built-in disk operating system is CBM DOS
Commodore_1541
Laws describing planetary orbits
In the following example animations, the red ray rotates at a constant angular velocity and with the same orbital time period as the planet, T = 1 {\displaystyle
Kepler's laws of planetary motion
Kepler's_laws_of_planetary_motion
Recordable optical disk technology
write strategy changes from constant linear velocity (CLV) to constant angular velocity (CAV), or zoned constant linear velocity (ZCLV). The table below largely
DVD_recordable
Constants describing characteristics of electrical motors
The motor size constant ( K M {\displaystyle K_{\text{M}}} ) and motor velocity constant ( K v {\displaystyle K_{\text{v}}} , alternatively called the
Motor_constants
Observation in physical cosmology
Hubble constant. Hubble inferred the recession velocity of the objects from their redshifts, many of which were earlier measured and related to velocity by
Hubble's_law
Optical analog video disc format
formats were developed based on the disc's rotation speed: CAV Constant angular velocity (CAV), also known as Standard Play, offered several advanced playback
LaserDisc
Physical constant for the strength of gravity induced by a mass
Gaussian gravitational constant was historically in widespread use, k = 0.01720209895 radians per day, expressing the mean angular velocity of the Sun–Earth
Gravitational_constant
General category of storage mechanisms
and constant angular velocity (used in HDDs, standard FDDs, a few optical disc systems, and vinyl audio records) spins the media at one constant speed
Disk_storage
Scientific educational toy
with a constant angular velocity ω {\displaystyle \omega } . If the motion is non-dissipative (frictionless), ω {\displaystyle \omega } is constant, and
Euler's_Disk
Greek mathematician and physicist (c. 287 – 212 BC)
moving away from a fixed point with a constant speed along a line which rotates with constant angular velocity. Equivalently, in modern polar coordinates
Archimedes
Digital optical disc format
half-height Blu-Ray writers have reached writing speeds of up to 16× (constant angular velocity) on single-layer BD-R media, while the highest reading speeds
Blu-ray
Type of computer disk storage drive
observing the writing speeds and patterns (e.g. constant angular velocity, constant linear velocity and P-CAV and Z-CLV variants) with different writing
Optical_disc_drive
Number of rotations per unit time
velocity; it has dimension of squared reciprocal time and SI units of squared reciprocal seconds (s−2); thus, it is a normalized version of angular acceleration
Rotational_frequency
a conserved quantity–that is, the total angular momentum of a closed system remains constant. angular velocity (ω) A measure of the rate at which an object
Glossary_of_physics
Topics referred to by the same term
self-driving car Constant air volume, a type of heating, ventilating, and air-conditioning (HVAC) system Constant angular velocity, a qualifier for the
CAV
Rational function of the form (az + b)/(cz + d)
physical interpretation. Imagine that some observer rotates with constant angular velocity about some axis. Then we can take the two fixed points to be the
Möbius_transformation
Rate of change of angle
oscillations and waves). Angular frequency (or angular speed) is the magnitude of the pseudovector quantity angular velocity. Angular frequency can be obtained
Angular_frequency
closer to the center of the disk. In constant angular velocity (CAV) recording, in which the disk spins at a constant speed no matter where the data is written
Write_precompensation
1962 film directed by David Lean
Laserdisc editions in two speed formats, CAV (Constant Angular Velocity) and CLV (Constant Linear Velocity). RCA/Columbia Pictures also issued a movie-only
Lawrence_of_Arabia_(film)
Frame-dependent apparent force in Physics
force, which arises when a rotating system changes its angular velocity (i.e., due to angular acceleration). While these forces are not real in the sense
Fictitious_force
Rate of change of acceleration with time
the disks (or drums) of the wheels. Rotational velocity decreases linearly to zero with constant angular deceleration. The frictional force, torque, and
Jerk_(physics)
Proprietary optical disc format used in the Dreamcast and other Sega systems
GameCube consoles. The GD-ROM drive in the Dreamcast reads data in constant angular velocity (CAV) mode at up to 12× speed. Nintendo optical discs Double-density
GD-ROM
Type of motion
When the angular acceleration is constant, the five quantities angular displacement θ {\displaystyle \theta } , initial angular velocity ω 1 {\displaystyle
Rotation_around_a_fixed_axis
Measure of change in amplitude and phase of a wave
attenuation constant (SI the unit: neper / metre) β {\displaystyle \beta } : phase constant (SI unit: radian/metre) ω {\displaystyle \omega } : angular frequency
Propagation_constant
Force directed to the center of rotation
{\displaystyle r} does not change in time. The object moves with constant angular velocity ω {\displaystyle \omega } around the circle. Therefore, θ = ω
Centripetal_force
Type of non-magnetic compass based on the rotation of the Earth
gyroscope is moving. The rotation of 2-O relative to 1-O is performed with angular velocity Ω → = ( 0 , 0 , Ω ) T {\displaystyle {\vec {\Omega }}=(0,0,\Omega )^{T}}
Gyrocompass
SI derived unit of angle
factors are magnitudes (numbers). Similarly in the formula for the angular velocity of a rolling wheel, ω = v/r, radians appear in the units of ω but not
Radian
Pre-pressed compact disc containing computer data
linear velocity of 9.6 m/s and a transfer rate of 1200 Kbyte/s. Above 12× speed most drives read at Constant angular velocity (CAV, constant rpm) so
CD-ROM
Parameters characterizing properties of our galaxy
in a constant angular velocity, Ω {\displaystyle \Omega } , which is independent of R {\displaystyle R} . Following this we can see that velocity scales
Oort_constants
Intrinsic quantum property of particles
theorem, the angular velocity is equal to the derivative of the Hamiltonian to its conjugate momentum, which is the total angular momentum operator J =
Spin_(physics)
Equation for sedimentation under centrifugation
s, and ω represent the solute diffusion constant, sedimentation coefficient and the rotor angular velocity, respectively. The first and second terms
Lamm_equation
Concept in classical mechanics
If the rotation is about the z {\displaystyle z} axis with a constant angular velocity Ω {\displaystyle \Omega } (so z ′ = z {\displaystyle z'=z} and
Rotating_reference_frame
disk. It is a form of constant bit-density recording done by gradually increasing the clock rate (zone constant angular velocity, ZCAV) and storing more
Commodore_4040
Class of problems in classical mechanics
around the circumference of a circle of radius r. Since the angular velocity ω = v/r is constant, the area swept out in a time Δt equals ω r2Δt; hence, equal
Classical central-force problem
Classical_central-force_problem
Displacement measured angle-wise when a body is showing circular or rotational motion
infinitesimal rotations are applied is irrelevant. Angular distance Angular frequency Angular position Angular velocity Azimuth Rotation matrix § Infinitesimal rotations
Angular_displacement
Toothed gear based on epicycloids and hypocycloids
the motion of one gear is transferred to the other at locally constant angular velocity. The size of the generating circle may be freely chosen, mostly
Cycloid_gear
Mechanism to convert between rotational and reciprocating motion
The sinusoidal motion, cosinusoidal velocity, and sinusoidal acceleration (assuming constant angular velocity) result in smoother operation. The higher
Scotch_yoke
Speed of electromagnetic waves
including "c" for "constant" or the Latin celeritas (meaning 'swiftness, celerity'). The "c" was used for "celerity" meaning a velocity in books by Leonhard
Speed_of_light
Measure of a civilization's evolution
a megastructure in the form of a disk rotating on itself at a constant angular velocity. According to him, the search for intelligent signals should be
Kardashev_scale
special case in flight dynamics where the aircraft's linear and angular velocity are constant in a body-fixed reference frame. Basic aircraft maneuvers such
Steady_flight
Company
and restructures a $78 million debt. All reading speeds are in constant angular velocity unless otherwise indicated. "?" indicates that the format is supported
Toshiba Samsung Storage Technology
Toshiba_Samsung_Storage_Technology
Branch of physics describing the motion of objects without considering forces
initial and final angular positions, ωi and ωf are, respectively, the initial and final angular velocities, and α is the constant angular acceleration. Although
Kinematics
System of stars and interstellar matter
the spiral arms rotate around the center, but they do so with constant angular velocity. The spiral arms are thought to be areas of high-density matter
Galaxy
Momentum curve of a rope
when anchored at its ends and spun around its long axis at a constant angular velocity. This shape is similar to the shape assumed by a skipping rope
Troposkein
Amount of energy transferred or converted per unit time
motor is the product of the torque that the motor generates and the angular velocity of its output shaft. Likewise, the power dissipated in an electrical
Power_(physics)
Laws in physics about force and motion
} When the torque is zero, the angular momentum is constant, just as when the force is zero, the momentum is constant. The torque can vanish even when
Newton's_laws_of_motion
Type of motor vehicle transmission
CVT with suitable control may allow the engine to operate at a constant angular velocity while the vehicle moves at varying speeds. CVTs are used in cars
Automatic_transmission
Vector quantity in celestial mechanics
question. Specific relative angular momentum plays a pivotal role in the analysis of the two-body problem, as it remains constant for a given orbit under
Specific_angular_momentum
Object movement along a circular path
mass, and radius are constant. Consider a body of one kilogram, moving in a circle of radius one metre, with an angular velocity of one radian per second
Circular_motion
Attitude control device used in spacecraft
spacecraft, applying a constant torque to the wheel using one of the gimbal motors causes the spacecraft to develop a constant angular velocity about a perpendicular
Reaction_wheel
Physical object which does not deform when forces or moments are exerted on it
to obtain the angular velocity. The angular velocity of a rigid body B in a reference frame N is equal to the sum of the angular velocity of a rigid body
Rigid_body
Type of motion in which the path of the moving object is a straight line
uniform linear motion, with constant velocity (zero acceleration); and non-uniform linear motion, with variable velocity (non-zero acceleration). The
Linear_motion
Spatial frequency of a wave
the wave, λ is the wavelength, ω = 2πν is the angular frequency of the wave, and vp is the phase velocity of the wave. The dependence of the wavenumber
Wavenumber
Method for deriving motion equations using calculus
angular velocity ω {\displaystyle \omega } as follows: A = ω t {\displaystyle A=\omega t\,} If angular velocity ω {\displaystyle \omega } is constant
Piston_motion_equations
Rate of change of velocity
maintain its inertial motion—to stay "as is," at rest or moving at constant velocity—while the frame accelerates. One example is that a person in an elevator
Acceleration
Rotating circular machine part with teeth that mesh with another toothed part
straight or circular, but of special form designed to achieve a constant angular velocity ratio. There is an infinite variety of tooth profiles that will
Gear
Physical acceleration experienced by an object
its measured weight. When holding onto a carousel that turns at constant angular velocity an observer experiences a radially inward (centripetal) proper-acceleration
Proper_acceleration
Paradox in special relativity
said to be "rigid"). Imagine a disk of radius R rotating with constant angular velocity ω {\displaystyle \omega } . The reference frame is fixed to the
Ehrenfest_paradox
Measurement of viscosity in fluid dynamics
fluid confined in the gap between two rotating cylinders. For low angular velocities, measured by the Reynolds number Re, the flow is steady and purely
Taylor–Couette_flow
Measure of similarity between curves
r_{1}+r_{2}} ), and the shortest leash when both owner and dog walk at a constant angular velocity around the circle ( | r 1 − r 2 | {\displaystyle |r_{1}-r_{2}|}
Fréchet_distance
Analog recording disc used mainly for early radio recordings
from the outside to the inside of the disc when recording in RPM/Constant Angular Velocity. From an archival perspective, the changeover traded long-term
Aluminum_disc
Turbomachinery Equation in Fluid Dynamics
{\displaystyle u_{2}\,} are the velocities of the blade at the inlet and outlet respectively. ω {\displaystyle \omega } is angular velocity. Figures 'a' and 'b'
Euler's pump and turbine equation
Euler's_pump_and_turbine_equation
Concept in celestial mechanics
In celestial mechanics, escape velocity or escape speed is the minimum speed needed for an object to escape from contact with or orbit of a primary body
Escape_velocity
Turning force around an axis
inertia and ω {\textstyle {\boldsymbol {\omega }}} is the orbital angular velocity pseudovector. It follows that τ n e t = I 1 ω ˙ 1 e ^ 1 + I 2 ω ˙ 2
Torque
Flow created by a uniformly rotating infinitely long plate disk
etc. Consider a planar disk of infinite radius rotating at a constant angular velocity Ω {\displaystyle \Omega } in fluid which is initially at rest
Von_Kármán_swirling_flow
features. The read-only optical drive reads Blu-ray discs at 6× constant angular velocity for a maximum read speed of 27 MB/s – a significant upgrade from
PlayStation 4 technical specifications
PlayStation_4_technical_specifications
Theorem regarding circulation in a barotropic ideal fluid
theorem can be applied to a rotating frame which is rotating at a constant angular velocity given by the vector Ω {\displaystyle {\boldsymbol {\Omega }}}
Kelvin's_circulation_theorem
Vector describing a wave; often its propagation direction
related by a fixed constant of proportionality, 2π radians per cycle. It is common in several fields of physics to refer to the angular wave vector simply
Wave_vector
Competition between proprietary formats in the same market
Discs saved space and were cheaper and sturdier, but due to the constant angular velocity (CAV) of their rotation, the sound quality varied noticeably from
Format_war
Observed discrepancy in galactic angular momenta
results indicated that the central part of the galaxy rotates at a constant angular speed. In 1932, Jan Hendrik Oort became the first to report that measurements
Galaxy_rotation_curve
2) constant angular velocity (CAV), used in HDDs, standard FDDs, a few optical disc systems, and vinyl audio records, spins the media at one constant speed
Hard disk drive performance characteristics
Hard_disk_drive_performance_characteristics
Geometric method for visualizing a rotating rigid body
inertial laboratory frame. The angular velocity vector ω {\displaystyle {\boldsymbol {\omega }}} of the rigid rotor is not constant, but satisfies Euler's equations
Poinsot's_ellipsoid
Physical quantity conserved throughout a motion
include energy, linear momentum, angular momentum and the Laplace–Runge–Lenz vector (for inverse-square force laws). Constants of motion are useful because
Constant_of_motion
Relative direction using a dial
pole star, the real reason being that the Earth rotates at a constant angular velocity. If hours were to represent divisions of the uniform rotation
Clock_position
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