9results about How to "Reduce dynamic stiffness" patented technology

The invention discloses an active and passive composite vibration reduction system, and particularly relates to the technical field of vibration reduction equipment, the active and passive composite vibration reduction system comprises a bottom shell, a load platform, a passive vibration reduction device and an active vibration reduction device, and the passive vibration reduction device and the active vibration reduction device are both arranged between the bottom shell and the load platform; the passive damping device comprises a positive stiffness mechanism and a negative stiffness mechanism which are arranged in parallel; the active damping device comprises a controller, a sensor, a piezoelectric actuator and a flat plate type voice coil motor, the sensor is fixed on the load platform, the sensor, the piezoelectric actuator and the flat plate type voice coil motor are all in signal connection with the controller, and the controller processes signals transmitted by the sensor and transmits commands to the piezoelectric actuator and the flat plate type voice coil motor. The method has higher control precision, stronger anti-interference capability and more excellent adaptability and flexibility, the inherent frequency and the formant peak value of the damping device are effectively reduced, the high attenuation of high-frequency vibration is ensured, and broadband vibration attenuation is realized.

The invention discloses a multi-spring combined quasi-zero stiffness vibration isolator. A positive stiffness mechanism and a plurality of negative stiffness mechanisms are ingeniously arranged between a base and a bearing platform, wherein the positive stiffness mechanism is composed of linear bearings, vertical springs and guide rods, and the negative stiffness mechanisms form a quasi-zero stiffness system. The low-frequency vibration isolator not only can bear a vibration isolation object with larger mass, but also can effectively reduce the dynamic stiffness of a vibration isolation system, so that the inherent frequency of the whole system is close to zero, and the vibration isolator has good low-frequency vibration isolation performance during low-frequency vibration; compared with other vibration isolators, the telescopic arm structure and the baffle can effectively guarantee that the spring stretches out and draws back on the same horizontal line, it is guaranteed that a negative stiffness mechanism can effectively work, the spring can be prevented from being unstable, better vibration isolation performance is achieved in low-frequency vibration isolation, and the resonance peak value of the vibration isolator is remarkably reduced. Meanwhile, the limiting mechanism can prevent the negative stiffness mechanism from being excessively compressed or stretched, the situation that the negative stiffness mechanism is damaged is avoided, and the vibration isolator can be widely applied to the fields of vibration isolation of automobiles, precise instruments and equipment, ship equipment and the like.

The present invention discloses a device for simulating weightlessness environment based on nitrogen springs and air floating pads, comprising a base plate, a hinge fixing mechanism, a space hinge, a counterweight, an air floating support mechanism and an exciting device, wherein the hinge fixing mechanism, the air floating support mechanism and the exciting device are sequentially mounted on the base plate, one end of the space hinge is connected to the hinge fixing mechanism, the other end of the space hinge is connected to a side surface of the counterweight, the other side surface of the counterweight is connected to an exciting rod of the exciting device, the counterweight is arranged on the air floating support mechanism and air floating support is formed for the counterweight through the air floating support mechanism; the device is used for measuring dynamic stiffness, so the inherent characteristics of the rubber rope will affect the accuracy of the test result, while the present invention uses an air floating device to reduce the external influence on the dynamic stiffness of the hinge.

The invention belongs to the technical field of rail transit equipment, and provides a multi-stage damping spring floating slab ballast bed and an adjusting method, and the multi-stage damping spring floating slab ballast bed comprises a floating slab, an underneath type vibration isolator, a side type vibration isolator, a first rigidity adjusting device, a second rigidity adjusting device, a base, a drainage ditch and a shear hinge device. Compared with a common spring floating slab, the structure has lower dynamic stiffness, but static stiffness is not reduced, and the bearing capacity is guaranteed while the vibration reduction effect of a track system is improved. And the track structure has certain transverse rigidity, so that the stress condition of the track structure in a curve section is obviously improved. And ultralow-frequency vibration reduction within 10 Hz can also be achieved, and the phenomenon of low-frequency vibration amplification of a traditional spring floating slab is restrained.

The double-flow-channel hydraulic mount comprises a rubber main spring, and an upper liquid chamber arranged in an opening mode is formed in the bottom of the rubber main spring; the base is arranged below the rubber main spring; the double-flow-channel structure is arranged in the base, the double-flow-channel structure comprises an upper flow channel assembly and a lower flow channel assembly, and the double-flow-channel structure has a first state and a second state. Through the arrangement of the double-flow-channel structure, a gap between a decoupling diaphragm and a decoupling diaphragm cavity can be blocked by the decoupling diaphragm under the large amplitude of a vehicle; damping liquid passes through an annular flow channel in the upper metal flow channel piece, so that a large damping angle is obtained, and aftershock generated after an engine passes through a pit and a ridge is relieved; due to the fact that a gap is formed between the decoupling diaphragm and the decoupling diaphragm cavity under the small amplitude, damping liquid can flow into the metal lower flow channel piece from the gap, dynamic stiffness peak valleys are generated at 40 Hz, and therefore the dynamic stiffness of the hydraulic mount is reduced, the vibration isolation rate under the idle speed is increased, and the comfort of the whole vehicle is improved.

The application provides a hydraulic bushing and a vehicle, and the hydraulic bushing comprises an outer tube, an inner tube and an elastic body connected between the outer tube and the inner tube, a cavity is formed between the elastic body and the outer tube, and a limiting structure abutting against the outer tube is arranged in the cavity; the limiting structure has two limiting blocks extending to the two sides of the elastic body, respectively, two liquid chambers are formed between the two limiting blocks and the elastic body, respectively, and a flow channel communicating the two liquid chambers is arranged on the limiting structure. The elastic body has a blocking structure arranged between the two liquid chambers, and the blocking structure has blocking blocks arranged corresponding to the two liquid chambers; when the pressure of damping liquid in one of the liquid chambers is greater than a preset threshold value, the corresponding blocking block can be deformed by extrusion, so that the damping liquid passes through the blocking block and flows to the other liquid chamber. The hydraulic bushing changes the fixed characteristics of the traditional bushing damping, and through the arrangement of the limiting structure and the blocking structure, the vehicle handling and comfort performance can be improved.

The utility model relates to a kind of bushing assembly, subframe structure and its vehicle, comprising: first bushing, second bushing and mounting piece, the first bushing is spaced apart with the second bushing, the mounting piece is connected with the first bushing and the second bushing, the mounting piece is used to install the first bushing and the second bushing.The bushing assembly, subframe structure and its vehicle of the present application, not only can improve the NVH performance of whole vehicle, but also facilitate the disassembly replacement of bushing.

The present application belongs to the field of rail transit equipment technology, and provides a multi-stage damping spring floating slab track bed and a regulating method, comprising a floating slab, a lower-mounted vibration isolator, a side-mounted vibration isolator, a first stiffness adjusting device, a second stiffness adjusting device, a base, a drainage ditch and a shear hinge device. The structure of the present application has lower dynamic stiffness than ordinary spring floating slab, but the static stiffness is not reduced, that is, the damping effect of the rail system is improved while the carrying capacity is ensured. It also has certain lateral stiffness, so that the stress condition of the rail structure in the curve section is significantly improved. It can also achieve ultra-low frequency damping within 10 Hz, and suppress the "low frequency vibration amplification" phenomenon of traditional spring floating slab.

This utility model discloses a nonlinear stiffness vibration reduction device, including a vibration damper assembly and a nonlinear vibration damping frame. The nonlinear vibration damping frame includes several double-link mechanisms hinged to both ends of the vibration damper assembly. The hinge joints of adjacent double-link mechanisms are connected by transverse springs. The vibration damper assembly includes a vibration damper and vibration damping springs disposed outside the vibration damper. A bearing top plate, a force transmission plate, and a base vibration plate are sequentially arranged along the vertical direction of the vibration damper, all connected to the ends of the corresponding vibration damping springs via spring seats. The two ends of the double-link mechanisms are respectively hinged to the bearing top plate and the base vibration plate. A transmission short rod connected to the double-link mechanism is provided on the force transmission plate, forming a rhomboid support structure through the transmission short rod and the double-link mechanism. This utility model has a stable structure, strong anti-tilting ability, and good impact resistance, improving the support reliability and vibration reduction effect of the device in complex vibration environments.