51results about How to "Good vibration control" patented technology

A vehicle has a drive control ECU that controls an internal combustion engine or a transmission on the basis of a target drive force. The drive control ECU has a first arbitrator that sets the target drive force on the basis of a driver's request and the like, and filters that have individually different damping characteristics and that correct the target drive force from the first arbitrator so that the vibration of a sprung weight of the vehicle is controlled, as well as a switch that includes a switching portion and a filter setting portion. The filter setting portion determines whether a pitching resonance frequency has changed. If having determined that the pitching resonance frequency has changed, the filter setting portion switches the filter having been used for correcting the target drive force to a filter corresponding to a post-change pitching resonance frequency.

A material for vibration control of the invention includes a propylene polymer (A) containing a constitutional unit (a) derived from propylene in the proportion of 40 to 100 mol % and a constitutional unit (b) derived from α-olefin having 2 to 20 carbon atoms excluding propylene in the proportion of 60 to 0 mol % [provided that the total of (a) and (b) is 100 mol %], and having a melting point measured by DSC of 90° C. or below or no observed melting point, and the material has excellent vibration controllability such as vibration damping property, vibration preventing property, sound insulating property, and sound absorbing property.

The invention discloses an adaptive internal model vibration control method based on gray information optimization for intelligent fan blades. The method aims at various uncertain factors existing in the vibration system of intelligent fan blades in a complex operating environment, and adopts a method based on gray information theory optimization. The self-adaptive internal model vibration control method uses the differential evolution identification method of gray relational optimization to accurately identify the blade vibration system under the influence of uncertainty, making the identification of the internal model vibration process more ideal and accurate; The parameters of the modal vibration controller are adaptively optimized and adjusted, which is conducive to improving the dynamic characteristics and robustness of the control system, so that the closed-loop system can achieve high-performance adaptive vibration control of intelligent fan blades while overcoming the influence of uncertain factors. Through the present invention, the gray optimization self-adaptive internal model vibration control method provided can overcome the influence of multiple uncertain factors of intelligent fan blades in a complex working environment.

The present invention provides a suspension control apparatus capable of an excellent vibration control by a model thereof designed to incorporate nonlinearity and a time-lag element of a control damper. The present invention employs the backstepping method which is one of nonlinear control methods, and is designed so as to incorporate the nonlinearity of a damper 4. In addition, a nonlinear controller 5 uses a damping force Fu obtained by expressing the dynamics of a damping force characteristic variable portion [damping force Fu(v, i)] by a first-order lag system, so as to compensate the dynamics of the damper 4, whereby a control system is formed so as to incorporate the time-lag element of the control damper. As a result, it is possible to reduce time lag, and to practically adjust a control force according to the characteristics of the control damper.

The invention provides a vibration reduction structure for a ball screw pair, and belongs to the technical field of damper vibration attenuation. The vibration reduction structure comprises the ball screw pair and damper units. A screw rod of the ball screw pair is a hollow screw rod, wherein the multiple damper units are distributed inside a cavity of the screw rod. Each damper unit is composed of a mass block, rubber rings and adjusting nuts. The two ends of each mass block are provided with the corresponding rubber rings which are fastened through the corresponding adjusting nuts. The mass block of each damper unit is fixed in one inner hole of the hollow screw rod in a supported mode through the corresponding rubber rings at the two ends, the supporting stiffness on each mass block by the corresponding rubber ring is changed through the adjusting nuts, as a result, the inherent frequency of all dampers is matched with the dynamic property of the ball screw pair, and the optimal vibration control effect can be achieved.

The invention provides a micro-wind vibration energy consumption suppression device for a service steel pipe tower rod part, and the device is suitable for vortex-induced wind vibration control of animportant lattice type steel pipe tower framework part such as a power transmission tower. The micro-wind vibration energy consumption suppression device is composed of a steel sleeve sheet, a first viscoelastic material, a second viscoelastic material, SMA springs, a flow guide sheet, connecting bolts and connecting plates. The device has a two-stage micro-wind vibration control effect, can destroy the Karman vortex to inhibit or reduce the generation of micro-wind vibration, and can completely achieve the purpose of controlling the micro-wind vibration of a steel pipe component through the deformation consumption of the viscoelastic materials. Meanwhile, the SMA springs with the super-elastic effect are connected between the steel pipe and the steel sleeve, so that the device has a remarkable self-resetting capability. The device is simple in structure, light in structure, flexible in arrangement, low in manufacturing cost and convenient to replace. The device has the self-resettingcapability, is strong in resistance to external interference and is good in robustness; and the two-stage micro-wind vibration control principle is achieved, the vibration control effect is remarkable, good social and economic benefits are achieved, and the application prospect is wide.