Variable-stiffness nonlinear energy trap vibration reduction method based on magnetic liquid suspension characteristics
A non-linear energy trap, magnetic liquid technology, applied in the direction of shock absorber, non-rotation vibration suppression, shock absorber, etc., can solve the problem of limited vibration reduction effect, no active response to external vibration, etc., to achieve flexible use, structure Simple, easy-to-install effect
Active Publication Date: 2021-12-03
BEIJING UNIV OF TECH
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[0004] In related technologies, nonlinear energy trap devices designed based on the principle of targeted energy transfer and shock absorbers based on the second type of suspension characteristics of magnetic liquids mostly adopt passive control, do not have active response to external vibrations, and have limited vibration reduction effects
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[0050] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.
[0051] Combine below Figure 1 to Figure 9 A nonlinear-magneto-rheological self-tuning vibration absorber 10 according to an embodiment of the present invention is described in detail. The nonlinear-magneto-rheological self-tuning vibration absorber 10 is the most promising hydraulic system vibration control device, and will have a wide application prospect in the field of hydraulic engineering.
[0052] combine figure 1 , a nonlinear-magneto-rheological self-tuning vibration absorber, including an acceleration sensor, an elect...
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The invention discloses a variable-stiffness nonlinear energy trap vibration reduction method based on magnetic liquid suspension characteristics. The method comprises the following steps that axial and radial suspension forces generated by magnetic liquid under the action of a non-uniform magnetic field generate nonlinear stiffness, when external excitation causes a dynamic mass to relatively move along a guide assembly, one-way targeted energy transmission is generated, then, the absorbed energy causes the magnetic liquid in a vibration absorber to be extruded, and a driving module is used for receiving a control signal output by an electronic control unit, applying a certain gain to the control signal and generating an alternating current with a certain amplitude and frequency as a driving signal to act on a stator; the distributed electromagnetic field generates a shearing effect on a flowing gap of the magnetic liquid, the magnetic liquid generates a magnetorheological effect under the two working modes, and damping force opposite to the excitation direction is formed, so that an energy consumption effect is achieved. The vibration absorber has a relatively obvious damping effect, and is low in cost, small in size and flexible to use.
Description
technical field [0001] The invention belongs to the technical field of dynamic vibration reduction, and in particular relates to a vibration reduction method of a variable stiffness nonlinear energy well based on the levitation characteristics of magnetic liquid. Background technique [0002] Nonlinear Energy Sink (NES) is a spring vibrator structure with cubic nonlinear stiffness and linear damping. It is an efficient vibration control device. It is mainly composed of three parts, namely lighter additional mass, Strong nonlinear stiffness and damping elements. Among them, the nonlinear stiffness can provide a nonlinear restoring force, so that the NES has an inconstant natural frequency, so the NES can undergo transient resonance capture (Transient Resonance Capture) with a series of modes of the main structure, thereby expanding its vibration reduction frequency band . In addition, the damping element can consume the vibration energy absorbed by the NES from the main str...
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Login to View More IPC IPC(8): F16F9/53F16F15/00
CPCF16F9/535F16F15/002
Inventor 纪辉恭飞聂松林宁冬晶
Owner BEIJING UNIV OF TECH