72 results about "Mass moment" patented technology

Wave energy conversion to produce electricity uses wave-engaging articulated, forward and after barges connected to a center inertial barge. A damper plate attached to the central barge minimizes heaving to increase stability. The barges use composite materials, steel or other materials that can withstand the impact and wear caused by a corrosive weather environment. A movable ballast weight in each barge adjusts the mass moment of inertia, and changes the natural pitching frequency. Electrical energy is generated from the motions of the barges and the movement of the movable ballast weights being converted by linear induction motor/generators and/or Pelton Wheel hydraulic systems connected to electrical generators. A dynamic computer control system controls the energy generating system to keep the forward/after barges and the movable ballast moving in phase with the wave excitation force. During dangerous wave action, the system is submerged and then re-surfaced when the waves have subsided.

A wheel, such as a traction wheel, with a momentum enhancing apparatus. The momentum enhancing apparatus may selectively enhance the wheel's ability to maintain its angular velocity at relatively high speeds, while having a reduced effect on the angular velocity of the wheel at relatively slow speeds. The momentum enhancing apparatus may include one or more bodies that either translate radially between the hub and the rim of the wheel to change the mass moment of inertia of the wheel, or rotate with the wheel and transfer the momentum of the bodies to the wheel under increasing loads. Methods of using such apparati and vehicles equipped with such apparati are also enclosed.

The present invention relates to a method of correcting rotor imbalance and a wind turbine thereof. The correction method comprises measuring the vibrations within at least one time window and determining an imbalance factor and an imbalance phase. The values of the parameters in the equation for calculating the correction action are then updated based on the imbalance factor and an imbalance phase. A correction angle for each of the wind turbine blades is calculated using these adjusted parameters. The correction angle is used to aerodynamically balance the rotor, and a model may be used to determine the initial values of the parameters. Another imbalance factor and imbalance phase is determined based on another set of measurements. This imbalance factor is then used to calculate a mass moment for correcting the mass imbalance in the wind turbine blades. The weight and location of a balancing mass is finally calculated based on this mass moment and installed in the respective wind turbine blades.

A multilayered torsional hinged device such as a scanning mirror including a hinge layer with an attaching member pivotally supported by torsional hinges. A front layer is bonded to the front side of the attaching member and a back layer is bonded to the back side of the attaching member. The front layer and the back layer have equal mass moments to balance the moment of inertia and stresses on the torsional hinges. Further, the attaching member and a back portion of the front layer define a spine structure that extends to the tips of the mirror. The spine structure allows reduction of weight and mass of the mirror while maintaining mirror stiffness. The back layer may be a permanent magnet if the mirror oscillating drive is a magnetic drive. Alternately, the back layer may be another silicon slice.

A handheld electronic game comprises a rotational body, an processor, a storage cell for powering the processor, a display screen for displaying images processed by the processor, and a number of keys for providing game-control input to the processor. A generator is electrically connected to the storage cell for applying voltage to and recharging the storage cell. There is also a flywheel rotatably with respect to the body, which is connected to the generator and provides a mass moment of inertia enabling rotation of the body relative thereto during dynamic rotational movement of the body.

In a rotary evaporator, the rotating speed of the rotating flask is automatically controlled or regulated dependent upon a detected process value, particularly the vibration behavior or the mass moment of inertia of the rotating flask.

The present invention relates to a magnetic suspension spherical flywheel imbalance vibration inhibition method. The Newton's second law and the gyro technique equation are employed to establish a magnetic bearing-rotor dynamics equation, based on the D'Alembert's principle, the disturbing force of imbalance mass moment on a rotor caused by deviation of rotor inertial axis from a geometrical axis, the disturbing force of the eccentricity on the rotor caused by the deviation of the rotor mass center from the geometrical axis and the disturbing force of the deflection negative moment on the rotor caused by suspension force passing through the rotor centroid and not passing through the rotor mass center are obtained. Rotor displacement amounts under the three disturbing forces are converted to the displacement amount under a sensor coordinate system and the displacement amount under a magnetic bearing coordinate system through a conversion matrix, the two displacement amounts are respectively acted in the controller and the magnetic bearing, and the feedforward inhibition method is employed to perform inhibition of the three disturbing forces. The magnetic suspension spherical flywheel imbalance vibration inhibition method can effectively improve the control precision of the imbalance vibration of the magnetic bearing-rotor system.

The invention discloses a self-synchronizing translation elliptical vibrating screen with three shock excitation motors. The self-synchronizing translation elliptical vibrating screen with the three shock excitation motors consists of a feeding hopper, a first shock excitation motor, a second shock excitation motor, a third shock excitation motor, a screen box, an isolation spring and a base, wherein the axis of the second shock excitation motor is parallel to that of the third shock excitation motor; the eccentric mass moment of the second shock excitation motor is the same with that of the third shock excitation motor; the second shock excitation motor and the third shock excitation motor rotate oppositely at equal speed; a perpendicular bisector of a connecting line of the axle center of the second shock excitation motor and the axle center of the third shock excitation motor is deviated from the total mass center of the screen box by a certain distance; the mass center of the screen box moves linearly and the screen box swings around the mass center by using generated linear shock excitation force; the axis of the first shock excitation motor is parallel to the axis of the second shock excitation motor and the axis of the third shock excitation motor; and by using shock excitation force generated by the first shock excitation motor, the mass center of the screen box moves circularly, and the screen box swings around the mass center. By exactly designing mounting positions of the three shock excitation motors, translation elliptical movement of the screen box is realized. By using the self-synchronizing translation elliptical vibrating screen, large shock excitation force can be provided, and the motor mounting positions are not limited by the structure of the screen box during design. The self-synchronizing translation elliptical vibrating screen is simple in structure, easy to manufacture and mount, easy and convenient to maintain, low in noise and low in cost.

A method and apparatus for determining the mass moment of inertia of a given object is disclosed, The apparatus is a mass moment of inertia platform whereon objects to be measured can be placed. The platform uses flex pivots as torsional springs and the method ensures the flex pivots are procured and assembled in such a way so as to limit flex pivot misalignment systemic errors thereby resulting in a highly accurate and low-cost apparatus for measuring the mass moment of inertia.

A lightweight, portable artificial sport log having physical properties that mimic a selected natural log is disclosed that has a hollow cylindrical shell of a suitable polymeric material defining a volume having the desired dimensions of length and diameter of a selected natural log of interest, an internal baffle support shape of a rigid polymeric foam material is fixed to said internal surface of said cylindrical shell, end closure members at ends of said hollow cylindrical shell provided with sealable fill/discharge openings for adding and draining water from the artificial log. The internal baffle volume and shape are determined such that the buoyancy of the artificial log generally equals the buoyancy of the natural log of interest and the mass moment of inertia resembles that of the natural log of interest when the artificial log is filled with water.

The invention relates to an unbalanced shaft for compensating for mass forces and/or mass moments of an internal combustion engine (1), having an unbalanced segment (8), the center of mass of which extends eccentric to the axis of rotation (11) of the unbalanced shaft (6) for generating the shaft imbalance (7), a bearing segment (9) adjacent to the unbalanced segment, and a bearing race (10) joined thereto, the outer surface (13) of which serves as a race for the rolling elements of a roller bearing rotationally supporting the unbalanced shaft, and the inner surface (12) of which retracts radially relative to the outer circumscribed circle (14) of the unbalanced segment in a bearing circumference region running in the direction of the imbalance. In order to assemble the bearing race on the bearing segment, the following geometric relationships are provided: (i) d2 > d1, (ii) e > 1/2 (d2 - d1), (iii) e < 1/2 (d2 + d1), where d1 = outer circumscribed circle diameter of the unbalanced segment and the bearing segment, d2 = inner diameter of the bearing race, and e = center point offset between d2 and d1.

A vehicle steering wheel has a skeleton (10) and an insert (16), housed in a receiving space (14) in the skeleton (10), to increase a mass moment of inertia. The accommodation space comprises walls (20, 22). The insert (16) is elastically bent by the walls (20,22) of the receiving space (14) abutting against it and is thereby tensioned clamped in the receiving space (16) and held therein.

A novel device for the study of self-contained timely sequential vehicular inertial thrust drive is presented, comprising a tandem mechanical frequency modulated oscillator using the combined effort of straight line and rotational inertial reluctance contained in the mass of flywheels. The flywheels are having straight line parallel axial orientation, opposite freewheeling rotation and opposite alternate cyclic free flowing non-uniform reciprocal motion in union with vehicular travel by means of a straight line to rotational-coupled motion. The straight line to rotational-coupled motion accomplishes the cyclic realignment of the flywheel motion to combine the straight line and rotational motion into one timely gradient vector sum motivating thrust drive. The free flowing straight line and rotational inertial reluctance of the flywheel mass is used as the motivating drive kinetic energy by timely non-uniform mutual reciprocal separation against the device mass and the freewheeling rotational inertial reluctance of the flywheel's mass moment is used to absorb rotational mutually reciprocal contrary rotational kinetic energy. An integral motor-generators rotor contained within each flywheel accumulates rotational kinetic energy subsequently used for the propulsion of the device and is used to obtain the frequency modulation and non-uniform motions. The motor-generator with attached rotational-to-reciprocating transmission is directing the accumulated kinetic energy non-uniformly mutually reciprocally into the device in direction of vehicular travel and into the free flowing straight line and rotational flywheel mass. The cyclic sum of all mutual and reciprocal actions is a closed loop cycle with two self-contained superior centripetal inertial thrust drives.

The invention discloses a cubic satellite mass moment bi-symmetrical layout attitude control device, include control module, Kinematic mechanism and fixture, A control module includes a system control board and a motor drive board, Four motor drive panels are secured to the system control panel, A linear motor is connected with that flexible wire, Four linear motors are arranged in parallel and vertically symmetrically, the linear motor and the counterweight block constitute a motion mechanism, the fixing device limits the freedom of the motion mechanism, and the linear motor shaft is fixed,the linear motor can be translated freely in the guide rail slot, and the fixing device and the control module determine the relative position relationship through four-corner through holes and studs.The cubic satellite mass moment bi-symmetrical layout attitude control device uses the double symmetrical counterweight block layout mode, reduces the occupied space of the device, simplifies the kinematics and dynamics model of the satellite, and realizes the effective control of the actuator.

A method to balance a crank drive of an internal combustion engine comprising: using a balancer unit comprising a first balance weight and a second balance weight serving as counterbalance; rotating the first and second balance weight at an engine rotation speed when a crankshaft rotates at the engine rotation speed; rotating the first balance weight in a same direction as the crankshaft; rotating the second balance weight in an opposite direction to the crankshaft; arranging the first balance weight and the second balance weight such that a resulting balancing moment about a velocity pole of a 1st order of a rigid body rotation of a drive unit at least partially balances a rotary movement about a velocity pole provoked by a resulting mass moment of the 1st order, an external effect of the resulting mass moment of the 1st order being at least partially balanced.

The invention refers to a device for reducing vibrations and sounds in a structure (1). The device comprises at least a dynamic element (4), which extends along two main axes and has a mass-moment of inertia, and at least a spring element (5) which is connected to the dynamic element (4) and which is adapted to be connected to the structure. The mass-moment of inertia is different with respect to the two main axes. The dynamic element is rotatable around an axis (x) of rotation, which is perpendicular to the two main axes.

In a method for measuring the speed of an electrical machine having a stator, a rotor and a winding, in particular of an electronically commutated motor, a speed-measurement signal ω is sampled, in that a measured speed value ω(k) for the rotor is determined for each of a series of sampling instants. Moreover, a moment of inertia value for the mass moment of inertia of the rotor is determined. In addition, a current signal I is sampled, in that a current value I(k) for the electrical current in the winding is determined for each of the sampling instants. An estimated value ω_s(k) for each of the measured speed values ω(k) is determined from a measured speed value ω_k(k−1) assigned to an earlier sampling instant, from the current signal I and from the moment of inertia value. A tolerance band containing the estimated value ω_s(k) is assigned to this estimated value ω_s(k). If the measured speed value ω(k) lies outside of the tolerance band, the measured speed value ω(k) is replaced by a speed value ω_k(k) that is within the tolerance band.