How to Moment of inertia?

Q: How to Moment of inertia?

Golf club head with peripheral weighting,Rotatory inertia piezoelectric actuator comprising dual-rhombic series driving mechanism and actuation method,Method for dynamically measuring rigidity of silicon balance spring and rotational inertia of balance wheel and measurement device,Permanent magnet double-stator synchronous machine,High power epicyclic gearbox and operation thereof

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The moment of inertia, otherwise known as the angular mass or rotational inertia, of a rigid body is a quantity that determines the torque needed for a desired angular acceleration about a rotational axis; similar to how mass determines the force needed for a desired acceleration. It depends on the body's mass distribution and the axis chosen, with larger moments requiring more torque to change the body's rotation rate. It is an extensive (additive) property: for a point mass the moment of inertia is just the mass times the square of the perpendicular distance to the rotation axis. The moment of inertia of a rigid composite system is the sum of the moments of inertia of its component subsystems (all taken about the same axis). Its simplest definition is the second moment of mass with respect to distance from an axis. For bodies constrained to rotate in a plane, only their moment of inertia about an axis perpendicular to the plane, a scalar value, matters. For bodies free to rotate in three dimensions, their moments can be described by a symmetric 3 × 3 matrix, with a set of mutually perpendicular principal axes for which this matrix is diagonal and torques around the axes act independently of each other.

Golf club head with peripheral weighting

InactiveUS6860818B2Increase moment of inertiaVariable distributionOptical fibre with multilayer core/claddingWound drainsEngineeringMoment of inertia

A golf club head with low peripheral and rearward weighting includes C-shaped and annular weights connected with at least one of the rear and bottom surfaces, respectively, of the head. The weighting within the peripheral weights is adjustable between the heel, rear, and toe portions of the head to customize the weight distribution of the head in accordance with a golfer's swing. The added weight and its orientation increases the moment of inertia of the head and reduces the rotation thereof.

Owner:TOPGOLF CALLAWAY BRANDS CORP

Rotatory inertia piezoelectric actuator comprising dual-rhombic series driving mechanism and actuation method

ActiveCN106208806AChange the status quo of power-off unlockingReduce assembly requirementsPiezoelectric/electrostriction/magnetostriction machinesInterference fitPiezoelectric actuators

The invention discloses a rotatory inertia piezoelectric actuator comprising a dual-rhombic series driving mechanism and an actuation method. The actuator consists of an upper baffle, a lower baffle, a bearing, a rotary output shaft, the dual-rhombic series driving mechanism and piezoelectric stacks, wherein the dual-rhombic series driving mechanism comprises series dual-rhombic rings; the piezoelectric stacks are in interference fit inside the series dual-rhombic rings; a friction block is arranged at a series joint of the piezoelectric stacks; the rotary output shaft of the actuator is connected with the upper baffle and the lower baffle through the bearing respectively; and the dual-rhombic series driving mechanism is fixedly assembled between the upper baffle and the lower baffle. After finish of assembly, a side face of the friction block is in close contact with the rotary output shaft, and the actuator can drive a load to output bidirectional rotary motion by control of voltage time sequences and amplitudes of the piezoelectric stacks. The rotatory inertia piezoelectric actuator has the characteristics of easiness in assembly, quick response and accurate action.

Owner:XIAN LONGWEI TECH CO LTD

Method for dynamically measuring rigidity of silicon balance spring and rotational inertia of balance wheel and measurement device

ActiveCN103674742AEliminate measurement effectsFast measurementStatic/dynamic balance measurementMaterial strength using repeated/pulsating forcesMeasurement deviceMoment of inertia

The invention discloses a method for dynamically measuring the rigidity of a silicon balance spring and rotational inertia of a balance wheel and a measurement device. The method comprises the following steps of A, adjusting a measurement state to a vibration state similar to the work of a watch and be close to the working frequency of the watch; B, dynamically measuring the vibration periods TB and TY of a balance wheel and balance spring vibration system; C, calculating the rotational inertia of the balance wheel to be measured and the rigidity of the balance spring to be measured, wherein the rotational inertia JB of a standard balance wheel in a swing body and the rigidity MB of a standard balance spring in the swing body are known; in FORMULA (1) and FORMULA (2), wherein M represents the rigidity of the silicon balance spring to be measured, and J represents the rotational inertia of the balance wheel to be measured. The method has the beneficial effects that the balance wheel and balance spring vibration system consisting of the balance spring and the swing body executes measurement under the condition of same working condition, so that the influence, which is caused by nonlinear errors, on the measurement is eliminated, the measurement speed is high, and the precision is high; the method belongs to a dynamic measurement method. Furthermore, the rigidity of the balance spring and the rotational inertia of the balance wheel can be measured through an instrument by only replacing the swing body.

Method for dynamically measuring rigidity of silicon balance spring and rotational inertia of balance wheel and measurement device

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Owner:TIANJIN SEAGULL WATCH CO LTD

Permanent magnet double-stator synchronous machine

InactiveCN101154863AReduce volumeReduced responseCooling/ventillation arrangementSupports/enclosures/casingsEngineeringMoment of inertia

A permanent magnetism double-stator synchronous machine is provided, wherein, a rotor is a multipolar drag cup rotor consisting of a tegular permanent magnetic steel, a non-magnetic bracket and a rotating shaft; the inner annulus and the outer annulus of the magnetic steel of the rotor are respectively provided with a bushing and a lantern ring; the single end of the drag cup rotor is fixed on the rotating shaft, and a fan is arranged on the rotor; an air passage is arranged on the bracket and between the bushing and the rotating shaft; the four corners of a square housing fixing an outer stator core are provided with air chutes; a left end closure and a right end closure are provided with vents correspondingly. The invention has the advantages of small cubage of the machine, minimal armature reaction and moment of inertia, convenient manufacturing and simple structure.

Owner:TIANJIN DEXIN ELECTRIC MACHINERY

High power epicyclic gearbox and operation thereof

InactiveCN112923026ASmall diameterReduce rotation input speedGas turbine type power plantsEngine fuctionsFlight vehicleGear wheel

The invention provides a high power epicyclic gearbox and operation thereof. A gas turbine engine (10) for an aircraft comprising: an engine core (11) comprising a turbine (19), a compressor (14), and a core shaft (26) connecting the turbine to the compressor; a fan (23) located upstream of the engine core, the fan comprising a plurality of fan blades; a gearbox (30) that receives an input from the core shaft (26) and outputs drive to a fan shaft (36) so as to drive the fan at a lower rotational speed than the core shaft, the gearbox (30) being an epicyclic gearbox (30) comprising a sun gear (28), a plurality of planet gears (32), a ring gear (38), and a planet carrier (34) arranged to have the plurality of planet gears (32) mounted thereon; and a gearbox support (40) arranged to at least partially support the gearbox (30) within the engine. The moment of inertia of the fan (23) is greater than or equal to 7.40x107 kgm2. A radial bending stiffness to moment of inertia ratio of: the radial bending stiffness of at least one of the fan shaft 36 at the output of the gearbox and the gearbox support 40 the moment of inertia of the fan 23 is in the range of from is greater than or equal to 2.5x10-2 Nkg-1m-3. A tilt stiffness to moment of inertia ratio of: the tilt stiffness of at least one of the fan shaft 36 at the output of the gearbox and the gearbox support 40 the moment of inertia of the fan 23 is greater than or equal to 4.0x10-4 Nrad-1kg-1m-1.