Topic
Dynamic Vibration Absorber
About: Dynamic Vibration Absorber is a research topic. Over the lifetime, 4764 publications have been published within this topic receiving 49429 citations.
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Patent•
25 Apr 2007
TL;DR: In this article, a damping device, especially active vibration absorber and the control method are discussed. And the control is based on half active and active combined control and is provided with low consuming and wide vibration damping frequency so on.
Abstract: The invention relates to a damping device, especially active vibration absorber and the control method. Said vibration absorber in vibration absorbing system comprises main drive part, vibration absorbing block, changeably stiffness part, magnetic insulation block and U-shaped bracket. The main drive part comprises permanent magnet and column electromagnet. The column iron core is fixed on the bottom of bracket and permanent magnet is fixed with vibration absorbing block by magnetic insulation block. The changeably stiffness part comprises U-shaped electromagnet and MR elastomer. U-shaped iron core is opened downward, of which MR elastomer are set on two inner sides respectively. Vibration absorbing block is set among two chips and the lower end of U-shaped iron core is fixed with the upper end of U-shaped bracket to form inner space where the main drive part, vibration absorbing block, MR elastomer and magnetic insulation block are accommodated. The control method is that the changeably stiffness part and main drive part are controlled respectively according to frequency, amplitude value and phase information of vibration-damping objects. The invention belongs to half-active and active combined control and is provided with low consuming and wide vibration-damping frequency so on.
13 citations
TL;DR: The proposed HSLDS vibration isolator can effectively isolate the self-excitation of the under-chassis equipment from the carbody and enhance the ride quality of the high-speed train.
Abstract: To minimize the self-excitation effects of the equipment on the carbody, a high static and low dynamic stiffness (HSLDS) vibration isolator is proposed by connecting a negative stiffness unit and a positive linear stiffness spring in parallel. The nonlinear stiffness of the HSLDS isolator can be designed according to the needs of any target stiffness curve. A vibration test is applied to obtain the vibration acceleration of the under-chassis equipment. A rigid-flexible coupling multi-body dynamic model of a high-speed train is established which considers the elastic vibration of the carbody and the self-excitation of the under-chassis equipment based on the tested result. Different connection methods of the under-chassis equipment including rigid hanging, vibration isolation theory (VIT) hanging, dynamic vibration absorber (DVA) hanging and HSLDS hanging are applied and their effects on the carbody vibration and ride quality are investigated. The simulation results reveal that the proposed HSLDS vibration isolator can effectively isolate the self-excitation of the under-chassis equipment from the carbody and enhance the ride quality of the high-speed train.
13 citations
TL;DR: A helicopter is roll vibration resistant having cantilever spring (40) supported masses (42) located at extreme outboard locations (30, 28, and 28, respectively) as discussed by the authors.
Abstract: A helicopter (10) is roll vibration resistant having cantilever spring (40) supported masses (42) located at extreme outboard locations (30) The spring portion (40) extends substantially horizontally and is rigidly secured to rigid structure (28) This vibration absorber (34) is tuned to the forced frequency established by the normal rotor (14) RPM times the number of rotor blades (16)
13 citations
Patent•
06 May 2015
TL;DR: In this article, an electromagnetic branch circuit damping vibration absorber adopting a ring-shaped permanent magnet was proposed. But the magnet yoke and the permanent magnet were not attached to the inner wall of the yoke.
Abstract: The invention provides an electromagnetic branch circuit damping vibration absorber adopting a ring-shaped permanent magnet. The electromagnetic branch circuit damping vibration absorber comprises an electromagnetic damping vibration absorber and a branch circuit; the electromagnetic damping vibration absorber comprises an axis rod, a sleeve sleeves fixedly on the axis rod and a coil wound on the outer wall of the sleeve; a magnet yoke sleeves on the axis rod, the ring-shaped permanent magnet is adhered on the inner wall of the magnet yoke, the sleeve sleeves the interior of the magnet yoke, the coil is arranged in the centre of the magnet yoke, the upper end of the magnet yoke is connected with the sleeve by an upper spring, and the lower end of the magnet yoke is connected with a bottom cover fixed on the axis rod by a lower spring; a vibration absorbing object is fixed on the upper end of the axis rod, namely, the sleeve and the coil are also fixed on the vibration absorbing object; the magnet yoke and the ring-shaped permanent magnet vibrate up and down along the axis rod, namely the ring-shaped permanent magnet and the coil move relatively; a negative-resistance negative-inductance branch circuit is adopted as the branch circuit, and two ends of the coil of the electromagnetic branch circuit damping vibration absorber are connected with the branch circuit to form an integral loop. The electromagnetic branch circuit damping vibration absorber can perform vibration absorbing control on structures such as beam, plate and shell, and can perform vibration absorbing control multi-stage vibration modes at the same time.
13 citations
13 citations