Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
  • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
  • F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
  • F16F15/18—Suppression of vibrations in rotating systems by making use of members moving with the system using electric, magnetic or electromagnetic means
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
  • F16F2232/00—Nature of movement
  • F16F2232/06—Translation-to-rotary conversion

Definitions

• the present invention is of a ball screw damper in the design of configuration.
• the damper described here is utilized to prevent machines, structures, automobiles etc from various types of shocks and vibrations and is a hybrid damper that has much higher reliability and versatility than hydraulic and pneumatic dampers being widely used.
• dampers employing a ball screw • nut mechanism such as a ball screw damper combined with the rotary eddy current devices, an electro-mechanical damper combined with the motor or generator, and an inertial damper combined with the rotational flywheel. They are disclosed in US patent numbers 5,775,469, 5,348,124, and German patent number 3,522,221.
• the present invention is to embody the hybrid damper that produces both the inertial force and the back electromotive force when it always operates.
• the damper can be operated passively or semi-actively by connecting a load variable resistive circuit(3) to control a damping level.
• the hybrid damper is an electrodynamic-shock-absorber type extendible and retractable strut.
• the damper is comprised of a DC motor/generator(l), a disk type of mass for inertial force(2), a resistive load variable circuit(3) for variable damping, and a telescoping structure(6, 7) with a ball screw(4) • nut(5) mechanism converting linear to rotary motion or rotary to linear motion.
• both the back electromotive force induced by the rotating DC motor/generator(l) shunted to the resistor and the inertial force by the rotating disk dissipate energy on both the extension and retraction of the damper wherein the damper provides a combination of a dissipative force and an inertial force.
• the ball nut(5) is attached to the telescoping rod(6), and is allowed to linearly move through the grooves of ball screw(4), and sitting inside the support cylinder(7).
• One end of the ball screw(4) rotated clockwise or counterclockwise by the linear motion of the ball nut(5) is contacted and supported with the thrust bearing(8), and the other end becomes the shaft that the inertia mass(2) and the motor/generator(1 ) are fixed in-line to.
• the motor/generator(l) and the rotational inertia mass(2) stay inside the case and is fixed to the bottom of the case wall.
• the load resistive variable circuit(3) is connected to the moto /generator( 1 ) .
• the hybrid damper allows us to design a large force capacity damper without severe difficulties by adjusting both the resistor(3) and the mass of disk(2) in an inexpensive way with simply adding a mass to the existing damper operated by a motor/generator(l) itself where the manufacturing cost of the damper considerably drops down.
• Various control schemes can be implemented with electronic circuits passively or semi-actively where a semi-active vibration control system enhances robustness and stability in the control system and thus is preferred.
• the semi-active control system in addition to simplicity and robustness, out performs an active system employing a linear optimal feedback control when the allowable control force is within a certain limit.
• the hybrid damper that is a electro-mechanical construction eliminates many problems associated with hydraulic and pneumatic shock absorbers that features cost effective/compact design, no seals to wear out, no periodic inspections to check fluid, high efficient and precise. 4) Brief Description of Drawings
• the hybrid damper is an electrodynamic-shock-absorber type extendible and retractable strut as can be best seen in Figure 1.
• the hybrid damper is comprised of a DC motor/generator(l), a disk type of mass for inertial force(2), a resistive load variable circuit(3) for variable damping, and a telescoping structure(6, 7) with a ball screw(4) • nut(5) mechanism converting linear to rotary motion or rotary to linear motion.
• the linear motion of the damper from shock forces or vibrations produces both an inertial force proportional to acceleration and a dissipative force proportional to velocity concurrently.
• Applications include high-rise buildings and structures, power plants, suspension bridges, landing struts, automobiles, rocket propulsion systems, military vehicles, submarines cradle systems & ships, missile launching systems, solar panels for satellites, any deployable civil and space structures, antenna support structures, etc

Landscapes

• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• General Engineering & Computer Science (AREA)
• Electromagnetism (AREA)
• Acoustics & Sound (AREA)
• Aviation & Aerospace Engineering (AREA)
• Mechanical Engineering (AREA)
• Vehicle Body Suspensions (AREA)
• Vibration Prevention Devices (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (2)

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ID=19701808

Family Applications (1)

Country Status (3)

Cited By (4)

Families Citing this family (2)

Citations (2)

Family Cites Families (6)

• 2000
  • 2000-11-27 KR KR1020000071087A patent/KR20020041261A/ko not_active Application Discontinuation
• 2001
  • 2001-11-27 WO PCT/KR2001/002043 patent/WO2002042659A2/en not_active Application Discontinuation
  • 2001-11-27 AU AU2002218562A patent/AU2002218562A1/en not_active Abandoned

Patent Citations (2)

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