108 results about "Inertial mass" patented technology

An apparatus for damping vibrations includes an inertial mass disposed in a cavity in a rotatable downhole component, the rotatable component configured to be disposed in a borehole in a subsurface formation, such as a resource bearing formation, the inertial mass coupled to a surface of the cavity by a damping fluid and configured to move within the cavity relative to the downhole component. The apparatus also includes a damping fluid disposed in the cavity between the inertial mass and an inner surface of the cavity, where rotational acceleration of the rotatable downhole component causes shear in the damping fluid to dissipate energy from rotational acceleration of the rotatable downhole component and causing the rotational acceleration to be reduced.

The invention discloses a multi-point steady-state excitation system and method for a bridge load test, and relates to the technical field of bridge tests, and the multi-point steady-state excitation system comprises a main excitation device, a plurality of auxiliary excitation devices and a main controller; the main controller is configured to select a to-be-tested mode of a bridge girder; exciting the bridge girder at the maximum vibration mode of the to-be-tested mode at the frequency of the to-be-tested mode by using main excitation equipment, so that the bridge girder vibrates at a single frequency; exciting the bridge girder at a plurality of maximum vibration modes corresponding to the to-be-tested mode by using a plurality of auxiliary vibration excitation devices, and keeping a preset phase difference between the vibration of the inertial mass block of each auxiliary vibration excitation device and the vibration of the bridge girder at the position where the auxiliary vibration excitation device is located; and selecting the next to-be-tested mode of the bridge girder, and repeating the process of exciting the bridge girder to vibrate until the bridge load test is completed. The bridge can be excited to generate obvious single-frequency steady-state vibration, the purposes of static load test and dynamic load test are achieved at the same time, few excitation devices are needed, and the test result precision is high.

The present invention relates to an active damper (1) for vibration attenuation in a boring bar (100) comprising an actuator (101) with electromagnets (4) attached to a body (2) thereof, and an inertial mass (3) in a cavity (12) of the actuator (101) movable in directions perpendicular to the longitudinal direction of the actuator (101); comprising an acceleration sensor (5) in the actuator (101) and control means (9) of currents of the electromagnets (4) depending on the measurements of the acceleration sensor (5).

A watercraft comprises a motor, an inertial mass, and a fin. The motor oscillates the inertial mass about an axis, producing a torque reaction on and oscillation of the motor. Oscillation of the motor is communicated to the fin, producing thrust. The system can be operated in reverse, to generate electric power when the system is in a flowing stream of thrust fluid.

The invention relates to the field of active vibration isolation, in particular to a control method and device of an active vibration isolation device, and the active vibration isolation device comprises a controller, a load, a passive vibration isolation unit for supporting the load, a base arranged on the ground and a plurality of inertial mass actuators arranged on the load. The mass center of the base corresponds to the mass center of the load. And each inertial mass actuator is correspondingly provided with a feedback sensor, so that a plurality of feedback sensors are arranged on the load. And a plurality of feed-forward sensors are arranged on the base. The active vibration isolation control method comprises the steps that feedback acceleration collected by the feedback sensor is obtained, and feedback control force corresponding to each inertial mass actuator is determined according to the feedback acceleration. The feedforward acceleration collected by the feedforward sensor is obtained, and the feedforward control force corresponding to each inertial mass actuator is determined according to the feedforward acceleration. And determining the output force of each inertial mass actuator according to the feedback control force and the feedforward control force. And effective suppression of load vibration is realized.

The invention discloses a bridge electromagnetic inertial mass hybrid control damping system and an overall hybrid control method. The damping system comprises an inertial mass assembly, an electromagnetic assembly, a rigidity assembly and a corresponding parameter adjusting circuit. Wherein the ball screw system is used for converting linear translation into rotation, the inertial mass assembly is used for providing acceleration type inertial mass damping, the electromagnetic assembly is used for providing speed type electromagnetic damping, and the rigidity assembly is used for providing rigidity. In a normal operation stage, a parameter adjusting circuit is utilized, and the purpose of adjusting electromagnetic damping and rigidity values is achieved by changing circuit input, so that semi-active tuning is realized; under the action of an earthquake, circuit input is fixed, so that parameters of the damper are constant, and the anti-seismic robustness of the damper can be improved.

A highly dynamic motion simulator comprised of an occupant platform 22 which is supported and articulated between two vertically oriented multi-axis translation mechanisms 21 and 23. The five degrees of freedom embodiment produces motion with five degrees of freedom (FIG. 1). The six degrees of freedom embodiment adds a longitudinal translation assembly which produces motion with six degrees of freedom (FIG. 2). This design minimizes inertial mass providing high dynamic performance.

A method for the fine adjustment of the rate of a mechanical oscillator with an oscillating inertial mass, equipped, in a first step, with an actuator made of material suitable for irreversible local micro-expansion under the action of laser fires, to impart to an inertia-block a radial travel during suitable laser fires on a writing zone of the actuator, in a second step, the initial rate of the oscillator is set and measured, in a third step, the direction and the value of the deviation required to achieve a predetermined rate range, and of the travel to be imparted to inertia-blocks are calculated, in a fourth step, a writing zone is subjected to femtosecond laser fires to create expansion lines by local molecular expansion to radially deform the actuator, in a fifth step the rate is measured and the third step and fourth step are repeated if required.

The invention discloses an MEMS (Micro Electro Mechanical System) inertial sensor with high static friction resistance. The MEMS inertial sensor includes a support structure and an inertial structure. The inertial structure comprises at least one inertial mass block, an elastic structure and a stop structure. The resilient structure is mechanically coupled to the inertial mass and the support structure such that when the support structure is subjected to acceleration parallel to the first direction, the inertial mass is movable in a direction parallel to the first direction. The stop structure is fixed relative to the support structure and includes at least one primary stop element and one secondary stop element. If the acceleration exceeds a first threshold, the inertial mass abuts the primary stop element and then rotates about an axis of rotation defined by the primary stop element. If the acceleration exceeds a second threshold, rotation of the inertial mass is terminated when the inertial mass abuts the secondary stop element.

The application belongs to the technical field of structural vibration control, and relates to a mechanical-electrical clutch variable inertial damper, which is a semi-active damping device applicable to civil structures and used for inhibiting the vibration of the structure under the action of an earthquake or wind load. The device is realized by matching a mechanical inertial system, an electrical inertial system, an energy recovery control system and an active inertial mass control system. The application ensures that the device provides an inertial force in the acceleration stage of the structure and does not provide a force in the deceleration stage of the structure. The electrical inertial system can effectively reduce the design capacity of the mechanical inertial system, and in combination with the active inertial mass control system, the semi-active variable inertial control similar to bang-bang control can be realized, and in combination with the energy recovery control system, the kinetic energy of the flywheel can be recovered in the deceleration stage.

The application discloses a parameter intelligent adjustable inertial mass damper and a control method thereof, which are applied to efficient vibration control of super-long stay cables on large-span cable-stayed bridges in the field of civil engineering, and the damper is composed of an inertial mass element, a damping element, a self-power supply system and a heat dissipation system.The inertial mass element is combined with a conductor disc and a linear module through a ball screw, and the continuous adjustment of the equivalent inertial mass is realized by using a stepping motor to control the position of a sliding block; the damping element adopts an electric eddy current structure, a damping force is generated by cutting the magnetic field of a permanent magnet and an electromagnet by a rotating conductor disc, and the real-time regulation and control of the damping force are realized by adjusting the current of the electromagnet.The application realizes the real-time calculation and self-adaptive adjustment of optimal and suboptimal control parameters of a target mode by combining acceleration spectrum analysis and an optimization algorithm, and has the advantages of high power, high efficiency, compact structure, intelligent control, self-power supply and strong durability, and the vibration reduction effect of the stay cable is significantly improved.

A stud-holder (1) for a regulating member (10) of a horological movement, the regulating member (10) including an inertial mass, for example a balance (23), a balance spring (25) including a strip (2) wound about itself in several turns, and a balance cock (22), the stud-holder (1) including a main body (31) intended to be mounted on the balance cock (42), and a stud (34) mounted on the main body (31) in a first direction, wherein the stud-holder (1) includes an arm (5) extending from the stud (34), the arm (5) being directed in a second direction under the main body (31), the second direction forming a non-zero angle with the first direction, so as to pass at least in part beneath a balance spring (25) held by the stud (34), when the stud-holder (1) is mounted on the regulating member (10).

A MEMS inertial sensor with high resistance to static friction is disclosed. The MEMS inertial sensor includes a support structure and an inertial structure. The inertial structure includes at least one inertial mass, an elastic structure, and a stop structure. The elastic structure is mechanically coupled to the inertial mass and the support structure so that when the support structure is subjected to an acceleration parallel to a first direction, the inertial mass can move in a direction parallel to the first direction. The stop structure is fixed relative to the support structure and includes at least one primary stop element and one secondary stop element. If the acceleration exceeds a first threshold, the inertial mass abuts the primary stop element and subsequently rotates about a rotation axis defined by the primary stop element. If the acceleration exceeds a second threshold, the rotation of the inertial mass is terminated when the inertial mass abuts the secondary stop element.

The present invention relates to an energy conversion device, and in particular to a fully enclosed pendulum inertia-driven rope-pulled wave energy power generation device, comprising an inertial mass body, an inertial mass shell, a first motor, a second motor, a third motor, and a fourth motor arranged in an outer floating body, wherein the outer floating body is a closed body, the inertial mass shell is arranged on the periphery of the inertial mass body, the inertial mass body is connected to the inertial mass shell, the inertial mass shell is suitable for driving the inertial mass body to swing, the inertial mass shell is suitable for swinging relative to the outer floating body, the inertial mass shell drives the third motor and the fourth motor to generate electricity when it swings back and forth or vibrates up and down relative to the outer floating body, and the inertial mass shell drives the first motor and the second motor to generate electricity when it drives the inertial mass body to swing left and right relative to the outer floating body. The present invention can absorb wave energy from multiple directions, improve energy utilization, and has higher working reliability.

A work string and method of absorbing a vibration at the work string. The work string includes an outer member, an inertial mass disposed within the outer member and a damping element between the outer member and the inertial mass. The damping element includes a liquid having a viscosity that increases with increasing temperature. The damping element absorbs the vibration being transferred from the outer member to the inertial mass.

This invention provides a vibration damping device and a method for designing such a device that can simultaneously tune to multiple natural vibration modes without increasing the installation space or weight. [Solution] The system includes a weight 2 attached to the building 11 (the structure to be damped) via a first spring 3, a first damping element 4 provided in parallel with the first spring 3 between the building 11 and the weight 2, and an inertial mass element 5, a second spring 7, and a second damping element 6 provided in parallel with the first spring 3 and the first damping element 4 between the building 11 and the weight 2. The inertial mass element 5 and the second damping element 6 are provided in parallel, and the second spring 7 is provided in series with the inertial mass element 5 and the second damping element 6. The period of the vibration system composed of the weight 2, the first spring 3, and the first damping element 4 is set to tune to one natural vibration mode of the building 11, and the period of the vibration system composed of the inertial mass element 5, the second damping element 6, and the second spring 7 is set to tune to another natural vibration mode of the building 11.

A regulating member for a horological movement including an inertial mass, for example a balance, a balance spring, and an index-assembly system for adjusting the rate of the balance spring, the index-assembly system including a stud-holder including a first portion and a second portion, the first portion being movable relative to the second portion, wherein the regulating member includes locking device configured to block the second portion of the stud-holder in one position with respect to a plate of the movement.

To overcome some or all of drawbacks in the conventional index systems by providing an actuation system compatible with a regulating device.SOLUTION: A regulating member 1 for a horological movement is provided, including an inertial mass, for example a balance 23, a balance spring 25, a balance cock 22, and an actuation system 20 for adjusting the rate of the balance spring. The balance spring includes a coiled ribbon and means 30 of adjusting stiffness of the balance spring, where the means is provided with a resilient element arranged in series with the coiled ribbon. The adjustment means includes a pre-stress device for applying a variable force or torque to the flexible (resilient) element. The actuation system includes an eccentric 10 for actuating the pre-stress means) of the adjustment means.SELECTED DRAWING: Figure 1

A MEMS tri-axial accelerometer is provided with a sensing structure having: a single inertial mass, with a main extension in a horizontal plane defined by a first horizontal axis and a second horizontal axis and internally defining a first window that traverses it throughout a thickness thereof along a vertical axis orthogonal to the horizontal plane; and a suspension structure, arranged within the window for elastically coupling the inertial mass to a single anchorage element, which is fixed with respect to a substrate and arranged within the window, so that the inertial mass is suspended above the substrate and is able to carry out, by the inertial effect, a first sensing movement, a second sensing movement, and a third sensing movement in respective sensing directions parallel to the first, second, and third horizontal axes following upon detection of a respective acceleration component. In particular, the suspension structure has at least one first decoupling element for decoupling at least one of the first, second, and third sensing movements from the remaining sensing movements.

The utility model relates to a speed regulating mechanism (1) for a clock movement, which comprises an inertial mass body such as a balance wheel (23), a hairspring (25) comprising a strip (2) wound for multiple circles, and an actuating system used for regulating the travel time difference of the speed regulating mechanism (1), the actuating system comprises an actuator (30) mechanically connected to the hairspring (25), the travel time difference of the speed regulating mechanism can be changed by the displacement of the actuator, the actuator (30) comprises a hook (39) engaged with the hairspring (25), and the stiffness of the hairspring (25) can be changed by the displacement of the actuator (30). The utility model also relates to a clock movement comprising the speed regulating mechanism and a clock comprising the clock movement.

The invention relates to an energy conversion device, in particular to a totally-closed pendulum inertia driving type rope traction wave energy power generation device which comprises an inertia mass body arranged in an outer floating body, an inertia mass shell, a first motor, a second motor, a third motor and a fourth motor. The inertia mass shell is arranged on the periphery of the inertia mass body, the inertia mass body is connected with the inertia mass shell, the inertia mass shell is suitable for driving the inertia mass body to swing, and the inertia mass shell is suitable for swinging relative to the outer floating body. The inertia mass shell drives the third motor and the fourth motor to generate power when swinging front and back or vibrating up and down relative to the outer floating body, and drives the first motor and the second motor to generate power when driving the inertia mass body to swing left and right relative to the outer floating body. Wave energy can be absorbed from multiple directions, the energy utilization rate is increased, and the working reliability is higher.

The present invention relates to the field of active vibration isolation, and particularly to a control method and device for an active vibration isolation device. The active vibration isolation device includes a controller, a load, a passive vibration isolation unit for supporting the load, a base arranged on the ground, and a plurality of inertial mass actuators arranged on the load. The centroid of the base is set corresponding to the centroid of the load. Each inertial mass actuator is correspondingly provided with a feedback sensor, so that a plurality of feedback sensors are arranged on the load. A plurality of feedforward sensors are arranged on the base. The control method for active vibration isolation includes obtaining the feedback acceleration collected by the feedback sensors, and determining the feedback control force corresponding to each inertial mass actuator according to the feedback acceleration. Obtaining the feedforward acceleration collected by the feedforward sensors, and determining the feedforward control force corresponding to each inertial mass actuator according to the feedforward acceleration. Determining the output force of each inertial mass actuator according to the feedback control force and the feedforward control force. The effective suppression of the vibration of the load is achieved.

The invention belongs to the technical field of bridge structure vibration control, and discloses a polynomial rigidity-based mass and damping integrated sling vibration reduction damper, which comprises a rigidity system mainly consisting of a first magnet group and an arc-shaped base and a mass and damping integrated system mainly consisting of an inertial mass ball. The inertial mass ball is arranged in the arc-shaped base, so that a TMD system which is simple in structure and high in reliability is formed; the arc-shaped surface of the arc-shaped base is formed by rotating a curve conforming to a cubic polynomial, and compared with a TMD with a fixed curvature, the vibration reduction effect and robustness are better; the mass ball made of various materials is the inertial mass of the TMD system and forms a damping system with the magnets on the inner surface of the arc-shaped base, so that the structure is simple and the reliability is high; the TMD system only has rolling friction force, so that the TMD system is more sensitive to start; the limiting device formed by the permanent magnets can effectively reduce collision impact force, and system damage is avoided.

A regulating member (1) for a horological movement including an inertial mass, for example a balance (23), a balance spring (25), a balance cock (22), and an actuation system (20) for adjusting the rate of the balance spring (25), the balance spring (25) including a coiled ribbon (2) and device (30) for adjusting the stiffness of the balance spring, which device is provided with a resilient element (5) arranged in series with the coiled ribbon (2), the adjustment device (30) including a pre-stress device (6) for applying a variable force or torque to the flexible element (5), the actuation system (20) including an eccentric actuating the pre-stress device (6) of the adjustment device (30).

A method for the fine adjustment of the rate of a mechanical oscillator with an oscillating inertial mass, equipped, in a first step, with an actuator made of material suitable for irreversible local micro-expansion under the action of laser fires, to impart to an inertia-block a radial travel during suitable laser fires on a writing zone of the actuator, in a second step, the initial rate of the oscillator is set and measured, in a third step, the direction and the value of the deviation required to achieve a predetermined rate range, and of the travel to be imparted to inertia-blocks are calculated, in a fourth step, a writing zone is subjected to femtosecond laser fires to create expansion lines by local molecular expansion to radially deform the actuator, in a fifth step the rate is measured and the third step and fourth step are repeated if required.

A karussel for a horological movement, the karussel including an inertial mass, a guide and a resilient return element for returning the inertial mass, configured to cause it to oscillate in a plane, as well as an escapement mechanism cooperating with the inertial mass, the karussel including a carriage intended to be rotatable, the inertial mass, the guide, the resilient return element and the escapement mechanism being arranged inside the carriage, the karussel including a first ball bearing allowing the carriage to rotate, when mounted in a horological movement, and a second ball bearing allowing the escapement mechanism to be actuated, the first ball bearing and the second ball bearing being arranged substantially in the same plane. A horological movement can include such a karussel, and a timepiece can include such a horological movement.

The present invention relates to the field of vibration damping technology, and particularly to a vibration suppression device and method for a parallel platform. The vibration suppression method for a parallel platform is applied to the vibration suppression device for a parallel platform. The vibration suppression device for a parallel platform is arranged on the upper platform of the parallel platform, and the upper platform is used to place a load. The vibration suppression method includes determining the natural frequency corresponding to the load placed on the upper platform. According to the natural frequency corresponding to the load, a virtual vibration absorber is designed. The acceleration collected by the acceleration sensor of the inertial mass actuator is obtained and input into the virtual vibration absorber to determine the control force generated by the virtual vibration absorber. According to the control force generated by the virtual vibration absorber, the force output by the inertial mass actuator is determined. In this way, when the load mass changes and the natural frequency changes, the vibration suppression of the parallel platform at the natural frequency can be achieved without changing the mechanical structure.

The application provides a fixed offshore wind turbine system underwater shaking table hybrid test method and system considering multi-field coupling, which can be used in the technical field of structure test. The fixed offshore wind turbine system underwater shaking table hybrid test method considering multi-field coupling comprises the following steps: inputting a test load and a horizontal inertia mass into a numerical substructure model for dynamic calculation, and outputting a first acceleration of a tower top; in the case that a test seismic wave is applied to the offshore wind turbine model through an underwater shaking table and a test wave flow load is applied through a wave and current generating device, determining a displacement stroke according to a difference between a second acceleration generated by a shaking table surface of the underwater shaking table and the first acceleration; and based on the displacement stroke, controlling horizontal movement of a mass block, so as to superimpose an inertial force generated by the mass block movement on the tower to apply a fluctuating wind load in the case that an average wind load in a test wind load is applied to the tower through a counterweight block loading device.

To enable a rotor to be pressed in an axial direction by a magnetic attraction force, and enable stable sensing to be performed while suppressing an increase in an inertia mass.SOLUTION: An axially central part of a ring magnet 43 is offset from an axially central part of a stator core 31 in a direction opposite to an abutting direction of an abutting member 44 against a first ball bearing 23. Therefore, by supplying a drive current to a coil 34 to drive an electric motor part 20, it is possible to generate a magnetic attraction force MF that attempts to move a rotor 40 to the other side in an axial direction. Due to an action of the magnetic attractive force MF, it is possible to prevent an axial position of the rotor 40 from fluttering and shifting, and consequently, it is possible to keep a separation distance between the ring magnet 43 and a total of three Hall elements Hv and Hw (only two are shown in Fig.9) in an axial direction of a rotating shaft 41 constant, and it is possible to perform stable sensing while suppressing an increase in inertia mass.SELECTED DRAWING: Figure 9

An actuator (10) of a steer-by-wire steering device of a motor vehicle comprises a housing (46, 146), a spindle (42, 142) and a positionally fixed spindle nut (43, 143) mounted so that it can rotate, which within the housing (46, 146) form a spindle drive (41, 141) for the axial displacement of the spindle (42, 142) relative to the spindle nut. An inertial mass (100, 300, 400, 400a, 500, 600) is at least indirectly coupled to the spindle (142), taking into account the oscillation behavior of at least one component of the actuator (10), in particular the spindle (142).