50 results about "Inertial mass" patented technology

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 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.

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.

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 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 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).

The invention relates to the technical field of sensors, in particular to a rotationally symmetrical L-shaped composite piezoelectric three-axis acceleration sensor which comprises a stainless steel base body frame, a central inertia mass block, a plane sensing unit, a shearing sensing unit and a signal leading-out system. Through the rotationally symmetrical L-shaped cantilever beam structure, the single inertial mass block is used for sensing the three-axis acceleration, the size and the mass of the sensor are remarkably reduced, the sensor is suitable for application scenes with extremely high requirements for the weight and the space, and on the basis of the single center inertial mass block, the three-axis acceleration can be sensed. The low-coupling, high-sensitivity and wide-band measurement of the three-axis acceleration is realized, and meanwhile, the sensor has the characteristics of small volume, light weight and high reliability, so as to solve the dilemma of a traditional orthogonal combined type and an existing integrated type MEMS sensor in high-end precision measurement application, and the suppression of common-mode interference is realized by combining differential output and a symmetrical structure. And the output stability of the sensor in a variable-temperature environment is improved.

The invention relates to a three-dimensional escapement for a timepiece movement comprising a driving device provided with a barrel and a gear train, the three-dimensional escapement comprising an inertial mass, an elastic return device and an escapement mechanism, wherein the three-dimensional escapement comprises an inner carrier and an outer carrier, the inner carrier carrying the inertial mass, the elastic return device and the escapement mechanism, the inner carrier being rotatable about a first axis of rotation, the outer carrier being rotatable about a second axis of rotation, the inner carrier being housed inside the outer carrier, the driving device being configured to actuate the rotation of the outer carrier in parallel with the rotation of the inner carrier, a first portion of the torque provided by the driving device being transmitted to the outer carrier, a second portion of the torque being transmitted to the inner carrier, the driving device being further configured to actuate the escapement mechanism in parallel with the rotation of the outer carrier and in parallel with the rotation of the inner carrier, a third portion of the torque provided by the driving device being transmitted to the escapement mechanism. The invention also relates to a timepiece movement comprising such a three-dimensional escapement.

A roller lifter (10, 10A) is provided, which is capable of preventing oscillations during reciprocating movement in the lifter guide. The roller lifter (10, 10A) comprises: a lifter body (21) that is cylindrical and moves back and forth in an up-down direction in a lifter guide (70); a pair of facing sections (22) that project downwards from the lifter body (21) and are spaced apart from each other in a radial direction of the lifter body (21); a rotation stop or stop (23, 23A) that is positioned between the pair of facing sections (22) and has a shape that projects downwards from the lifter body (21) and is bent outwards in the radial direction; a wave member (12) extending in the radial direction, both ends of which are supported or carried in the radial direction on the pair of facing sections (22); a roller (11) rotatably mounted on or on thea shaft element (12) is provided and is in contact with a cam (90); and an inertial mass (24, 24A) is provided below the lifting body (21). A portion below the rotary stop (23, 23A) does not have the inertial mass and is open.

The application provides a suspension type vibration isolation system, belonging to the technical field of transportation vibration isolation, comprising: an outer frame connected with an inner frame through a plurality of vibration isolation mechanisms arranged in a cable-stayed manner; the vibration isolation mechanism comprises: an inertial container, the inside of the inertial container is provided with a series connection of an inertial mass structure and a damper, and the outside of the inertial container is connected in parallel with an elastic device; the suspension type vibration isolation system of the application adopts the parallel combination of the elastic device and the inertial container, the damper is added to the inside of the inertial container, wherein the elastic device is responsible for bearing, the inertial mass structure is responsible for generating inertial force, and the damper is responsible for generating damping force, so that the bearing problem is solved and the damping force is increased. The inertial mass structure is a new type of mechanical element, has the advantages of "high frequency resistance and low frequency", "small mass and large inertia", and the like. Due to the advantages of the inertial mass structure, the inertial mass structure has a wide application prospect in the field of vibration isolation and can well improve the vibration isolation effect of the vibration isolation system on low frequency vibration.

The invention relates to a device for simulating a belt slack and / or for simulating belt forces, comprising a guide (12) for a seatbelt (20) which includes static guide elements (14) and a movable deflection element (16) which is adjustable relative to the latter from an initial state via an intermediate state to a final state, and at least one inertial mass (18), wherein the guideway (17) for a seatbelt (20) predetermined by the deflection element (16) and the adjacent guide elements (14) is V-shaped in the initial state and the deflection element (16) and the inertial mass (18) do not interact, in the intermediate state is designed to be less V-shaped and the deflection element (16) and the inertial mass (18) interact, and the predetermined guideway (17) is at least approximately linear in the final state.

A method for setting the rate of a regulating organ (10) in a horology movement, the regulating organ (10) including an inertial mass (5), such as a balance, and resilient means (2) for returning the inertial mass (5), such as a balance spring, the resilient return means (2) being configured to enable the inertial mass (5) to carry out an oscillatory movement, the method including a step in which material is added to and / or removed from the inertial mass (5) by projecting material (9) using a laser (7).

The invention discloses a cable parallel robot vibration suppression device matching design method based on frequency and power, and the method comprises the steps: firstly obtaining the vibration energy distribution and inherent frequency characteristics of an under-constrained cable parallel robot system in a full working space through the building of a system dynamic model of the under-constrained cable parallel robot and the modal analysis; secondly, establishing an alternative device library comprising various actuators such as a flywheel, a rotor wing, a pendulum bob, a linear inertia mass block and an air injection device, and constructing a parameterized kinetic model of each device; based on a parameter matching derivation method of a physical mechanism, quantitative constraint relations among motor power, response bandwidth, geometric dimensions and system vibration frequency and energy are respectively established for different devices; and finally, based on the deduced matching criterion, determining an optimal device configuration and design parameters by using an optimization algorithm. According to the method, it can be ensured that the dynamic response capacity of the vibration suppression device is highly matched with the vibration characteristic of the robot system from the physical mechanism level, and the multi-dimensional coupling vibration problem of the under-constrained cable parallel robot is effectively solved.

The utility model relates to an adjusting member (1) for a clock movement, a clock movement and a clock. The adjusting member of the timepiece movement comprises an inertial mass such as a balance (23), a balance spring (25) comprising a winding band (2) and an adjusting device (30) for adjusting the stiffness of the balance spring, a balance clip (22) and an actuation system (20) for adjusting the rate of the balance spring (25), the device being provided with a flexible element (5) arranged in series with the winding band (2), the adjustment device (30) comprises prestressing means (6) for applying a variable force or torque to the flexible element (5), and the actuation system (20) comprises eccentric means for actuating the prestressing means (6) of the adjustment device (30).

A three-dimensional karussel for a horological movement including a drive device provided with a barrel and a gear train, the three-dimensional karussel including an inertial mass, an elastic return device for the inertial mass and an escapement mechanism, wherein the horological movement includes an inner carriage and an outer carriage, the inner carriage carrying the inertial mass, the elastic return device for the inertial mass and the escapement mechanism, the inner carriage being capable of moving in rotation about a first axis of rotation, the outer carriage being capable of moving in rotation about a second axis of rotation, the inner carriage being housed inside the outer carriage, the drive device being configured to actuate the rotational motion of the outer carriage in parallel with the rotational motion of the inner carriage.

A three-dimensional karussel- or tourbillon-type regulating member for a horological movement, the regulating member including a drive device provided with a barrel and a gear train, the regulating member including an inertial mass, elastic return device for the inertial mass, an escapement mechanism, an inner carriage capable of moving in rotation about a first axis of rotation, and an outer carriage capable of moving in rotation about a second axis of rotation, the inner carriage being housed inside the outer carriage, the inner carriage carrying the inertial mass, the elastic return device for the inertial mass and the escapement mechanism, and including a first ball bearing arranged to enable the outer carriage to rotate in the horological movement, with the first ball bearing being arranged at the periphery of the outer carriage.

The embodiment of the invention provides a damping device and a damping system, and relates to the technical field of bridge construction.The damping device comprises a simple pendulum assembly, a transmission assembly and an inertia mass piece, the pendulum length of the simple pendulum assembly is adjustable, the simple pendulum assembly is rotationally connected with a deck crane, and the transmission assembly is rotationally connected with a pendulum mass piece of the simple pendulum assembly; the inertia mass part is connected with the transmission assembly, and during bridge construction, vibration is transmitted to the deck crane to promote the simple pendulum assembly to swing so as to absorb vibration energy transmitted by the deck crane; the pendulum length of the simple pendulum assembly is increased along with increase of the length of a bridge cantilever, and when the pendulum length of the simple pendulum assembly is adjusted to the maximum value, the pendulum mass piece enables the transmission assembly to output torque to drive the inertia mass piece to rotate so as to absorb vibration energy transmitted by the bridge deck crane. In the embodiment of the invention, the pendulum length adjustment is matched with the inertial mass part, so that the frequency adjustment range of the vibration reduction device is expanded, ultralow-frequency vibration caused by an overlong cantilever in large-span bridge construction is covered, and an overlarge space does not need to be occupied.

The application belongs to the technical field of structure damping, and discloses an inertia-capacitor-particle composite damping device with structure reinforcing function. The particle damper is optimized based on the inertia capacitor and the cross partition reinforcing structure, so that the damping device is light and efficient, and has the functions of structure reinforcing and multidirectional damping. The damping box structure is complementary to the inertia mass effect of the inertia capacitor through the collision energy consumption between the steel ball particles and the cavity in the particle box and the multidirectional free motion of the particle box caused by the structure vibration, effectively reduces the vibration response of the power transmission tower, and realizes the lightweight design goal. The adjustable telescopic arm and the lock structure add the cross partition reinforcing performance to the damping box, and guarantee the overall spatial stability of the power transmission tower structure when bearing the vibration force. In addition, the design of the adjustable telescopic arm and the lock structure type makes the application have the characteristics of convenient transportation and carrying, quick maintenance, small construction difficulty, operation safety and the like.

The invention relates to a high-frequency dynamic stiffness measuring device which comprises a frame, an inertial mass assembly arranged at the bottom of the frame, a preloading assembly connected to the top of the frame and a high-frequency excitation assembly connected to the frame and located between the inertial mass assembly and the preloading assembly. The preloading assembly comprises an air chamber connected to the top of the frame and an air spring which is communicated with the air chamber and faces the inertial mass assembly; the high-frequency vibration excitation assembly comprises a piezoelectric vibration exciter abutting against the lower portion of the air spring and an elastic supporting assembly for fixing the piezoelectric vibration exciter to the frame. The piezoelectric vibration exciter further comprises an acceleration sensor arranged on the piezoelectric vibration exciter and a force sensor arranged between the piezoelectric vibration exciter and the inertial mass assembly. The device has the advantages of being high in preload adjustment flexibility, high in test universality, high in detection accuracy, suitable for high-frequency detection and the like.

A friction damper for mitigating high-frequency torsional oscillations in a drill string includes first and second inertia masses radially disposed about a drill string, each having equal rotational inertia. First and second bearings extend axially from the inertia masses, while third and fourth bearings are affixed to the drill string. Axial springs between the inertia masses apply a normal force, urging them apart so that friction surfaces of the bearings interface. Optional centering elements may maintain alignment and prevent unwanted motion between the inertia masses. The normal force is adjusted to provide a transition from sticking to sliding friction within a predetermined amplitude range, dissipating energy and damping oscillations. The damper may have an open configuration allowing mud flow, with protective elements preventing blockage, or a closed configuration with coverings sealing the annulus to prevent pressure drop.

This invention discloses a modular automotive bumper assembly and its installation method, belonging to the field of automotive bumper technology. The modular automotive bumper assembly of this invention includes a bumper cover plate, a pneumatically driven liquid booster pump, and a magnetorheological fluid energy-absorbing box. Side guards are welded to both sides of the bumper cover plate. An inertial plate is installed at one end of the magnetorheological fluid energy-absorbing box. Magnetorheological fluid storage tanks are provided at both ends of the pneumatically driven liquid booster pump. A booster sleeve is installed inside the magnetorheological fluid energy-absorbing box. This invention solves the problem that existing modular bumpers cannot achieve adaptive energy absorption and cannot guarantee instantaneous compressive strength. This invention utilizes the magnetorheological fluid, which mainly flows in a low-viscosity Newtonian fluid state, to provide basic damping. During a collision, the deceleration causes the inertial mass block to generate sufficient force, instantly pushing the inertial plate and changing the gap or flow channel shape of the shear valve, generating a huge damping force, thereby significantly improving the instantaneous compressive strength of the magnetorheological fluid energy-absorbing box.

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.

This invention provides a landing gear anti-sway device with a nonlinear inertial container, comprising an upper end cover and a lower end cover fixedly connected. A piston rod is inserted into the lower end cover, and the lower end cover is fixedly connected to the upper torsion arm of the landing gear. The portion of the piston rod extending out of the lower end cover is fixedly connected to the lower torsion arm of the landing gear. The piston rod has two stages of pistons. The first stage piston is the piston of the hydraulic inertial container, and the inertial mass coefficient of the inertial container changes with the piston displacement, thus playing the role of energy absorption by the nonlinear inertial container. The second stage piston is the piston of the conventional hydraulic damper, which plays the role of energy absorption and energy dissipation.

The invention relates to a method for precisely regulating the speed of a mechanical pendulum with a pendulum inertia mass, which in a first step is equipped with an actuator made of a material adapted to undergo irreversible local microswelling under the action of laser irradiation, in order to impart radial movement to the inertia mass during appropriate laser irradiation on a writing zone of the actuator, in a second step, the initial speed of the pendulum is set and measured, in a third step, the direction and value of the deviation required to achieve a predetermined speed range, and the direction and value of the stroke to be imparted to the inertia mass are calculated, in a fourth step, the writing zone is subjected to femtosecond laser irradiation in order to generate a swelling line by local molecular swelling, thus deforming the actuator radially, in a fifth step, the speed is measured, and if necessary, the third and fourth steps are repeated.