1900 results about "Vibration absorption" patented technology

The invention specifically relates to a mass tuned vibration reducer used for controlling the vibration of an aerobridge in the airport, a large-span pedestrian bridge, a port trestle, high-rise buildings and the related structures. The mass tuned vibration reducer comprises a mass block, a spring, a damper and a base; wherein, the spring can be a spiral spring, a disc spring or a plate spring, and the end part of the spring is provided with a rigidity regulating device. The mass tuned vibration reducer can successfully realize the regulation on the natural frequency of a TMD system under the condition of needing not to assemble and disassemble the TMD since the end part of the spring is provided with the rigidity regulating device, so as to simplify the difficulty of regulation work, avoid the waste of manpower and materials and greatly reduce the construction cost. Meanwhile, the natural frequency and the damping of the system can be regulated in an optimized way under the condition of needing not to assemble and disassemble the TMD, thereby better exerting the vibration absorption performance of the mass tuned vibration reducer, ensuring safety and stableness of the pedestrians and vehicles on the large-span bridge and the thin and high building, contributing to prolonging the service lives of the thin and high building and the bridge, and having remarkable economic and social benefits.

This disclosure concerns a cytometry system including a handling system that presents single cells to at least one quantum cascade laser (QCL) source. The QCL laser source is configured to deliver light to a cell within the cells in order to induce resonant mid-IR vibrational absorption by one or more analytes, leading to local heating that results in thermal expansion and an associated shockwave. An acoustic detection facility that detects the shockwave emitted by the single cell.

An acoustic noise reduction accessory apparatus attachable or made integral to a personal computer or other electronics equipment. The apparatus reduces acoustic noise emitted from the rear of the computer and in particular reduces the acoustic noise from circulating fans. The apparatus comprises an acoustic barrier or shielding member. The barrier is shaped in various forms externally of the computer or integrally extending from the back of the computer around one or more fans of the computer; the acoustic barrier member allows for minimum airflow reduction. Acoustic absorbing material is layered upon the acoustic barrier and may be combined with vibration absorbing material. The barrier may be shaped from solid or flexible members to accommodate different sized electronics and formed to include baffles and structures to direct airflow while absorbing noise; and may be made adjustable by one or more slidable members. The apparatus is easily assembled and collapsible for storage.

The invention specifically relates to a mass tuned vibration reducer used for regulating the subsidence ratio of the vibration of the related structures. The mass tuned vibration reducer comprises a mass block, a spring, a damper and a base, and is characterized in that the damper is an adhesion-type damper formed by a damping cylinder, adhesive damping fluid and a piston, wherein, the piston and the adhesive damping fluid are arranged in the damping cylinder, and at least part of the piston is immerged into the adhesive damping fluid. The mass tuned vibration reducer adopts the adhesion-type damper formed by the adhesive damping fluid and the piston and can provide three dimensional damping, so as to effectively prevent side tumbling and ensure the vibration reducer realizes smooth actions; vibration mass is not needed to be provided with a special guide device, so that the mass tuned vibration reducer has reliable work and higher cost performance, and basically needs no maintenance. Meanwhile, the mass tuned vibration reducer realizes the aim of regulating the natural frequency and the subsidence ratio at any time, thus better exerting the vibration absorption performance of the mass tuned vibration reducer, ensuring stableness and safety of the pedestrians and vehicles on the large-span bridge and the thin and high building, contributing to prolonging the service lives of the thin and high building and the bridge, and having remarkable economic and social benefits.

A tunable vibration absorption device is provided that is suitable for active or semi-active vibration absorption or damping of vibrations in vibrating structures. It comprises a stack including a force actuator mechanism for generating an axial actuation force and a force sensor mechanism which is responsive to an external force acting on the stack to generate a force signal. A controller unit is electrically connected to the force sensor mechanism for receiving the force signal generated by the force sensor mechanism, and it is also electrically connected to the force actuator mechanism for adjusting the axial actuation force generated by the force actuator mechanism in response to the received force signal generated by the force sensor mechanism.

The invention relates to a three-dimensional tuned mass damper device with a clamping groove. The three-dimensional tuned mass damper device comprises an outer sleeve, an outer bottom plate, an upper clamping plate, an upper tunable mass block, a lower tunable mass block, an upper clamping groove outer ring, an upper clamping groove inner ring, a lower clamping groove outer ring, a lower clamping groove inner ring, a horizontal spring, a vertical spring, a horizontal damper and a vertical damper. The mass of the dampers is adjusted by adjusting the number of the mass blocks so as to achieve the frequency adjustment of the dampers; and due to a three-way limiting device, the frequencies in different directions are not influenced and the purpose of three-dimensional shock/vibration absorption is achieved. The three-dimensional tuned mass damper device can control the influence of the air vibration effect on the structure and reduce the effect of an earthquake on the structure, and can be used for vibration control of building structures such as bridge constructions, ocean platforms, large-span cantilever structures and the like.

The invention relates to a polydialkene composite rubber of trans-1,4- structure and preparation methods thereof. The composite rubber consists of 10 to 80 mass percent of trans-1,4-polyisoprene and 20 to 90 mass percent of trans-1,4-butadiene-isoprene copolymer, wherein over 90 percent of structural units of all dialkenes in the composite rubber have trans-1,4-structures. The first preparation method comprises the following steps of: homopolymerizing isoprene to obtain trans-1,4-polyisoprene by adopting a Ziegler-Natta catalysis system consisting of MgCl2 supported titanium and organic aluminum compound, and then adding butadiene to synthesize the trans-butadiene-isoprene copolymer. The second preparation method comprises the following steps of: adding mixed monomers of butadiene and isoprene into a polymerization device at the same time, performing copolymerization to obtain the butadiene-isoprene copolymer of the trans-1,4-structure, and continuously polymerizing the isoprene to obtain the trans-1,4-polyisoprene after the butadiene with high polymerization speed is completely consumed. The used polymerization device is a stirring reaction kettle or a screw extruder. The composite rubber has excellent performance such as low rolling resistance, low generated heat, abrasion resistance, particularly fatigue break increment resistance and the like, and is suitable for dynamically used rubber products such as tyres, vibration absorption materials and the like.

A method and apparatus for driving and extracting piles that includes a vibration/tension load absorber assembly mounted between a housing and the vibratory unit which includes shear-type vibration absorbers connected between the housing and the vibratory unit and operating in combination with at least one compression-type vibration absorber positioned to be compressed between first and second compression plates when the tension load reaches a predetermined level.

A vibrating hammer glove having a motor housing cover with a palm portion across the top of a hammer housing includes downwardly depending flaps which wrap around the housing and fasten with a stationary fitting. Further, a securement strap is trained through slots in the flaps so that the terminating ends thereof engage in a hook and pile fastener. A cushion between the palm portion of the cover and the underside of the strap provides additional shock and vibration absorption. A securement ring midway between opposite strap ends engages the stationary fitting so that the strap and glove are properly aligned, mounted, and retained on the housing. Air vents are provided in the palm portion and in the attachment flaps, whereby heat generated within the housing is dissipated to the environment.

The invention discloses a rail vibration absorber which comprises an elastic element, a mass block and at least one connection framework. The connection framework is the same as the surface of a steel rail non-working surface connection part in shape. The connection framework comprises at least one vibration absorption cavity. At least a part of the mass block is arranged in the vibration absorption cavity of the connection framework. The elastic element is arranged between the mass block and the cavity wall of the vibration absorption cavity. The rail vibration absorber has the advantages that due to the fact that a mass-spring system composed of the mass block and the elastic element is arranged in the connection framework, the mass block and the elastic element are effectively protected by the connection framework; the mass block is only connected with the elastic element in series so that the material selection range of the elastic element can be wide; the space occupied by the elastic element is small, so that a larger and heavier mass block is arranged under the same condition, and the quality tuning vibration reducing effect is achieved; the rail vibration absorber is simple in structure, stable in performance, good in weather resistance, wide in application frequency domain, long in service life, superior in cost-performance ratio, beneficial to delaying abrasion to a steel rail and prolonging the service life of the steel rail, and very wide in market application prospect.

Disclosed herein is a smart vibration absorber for traffic signal supports. In exemplary embodiments, the vibration absorber utilizes the mass of the signal head as a damped vibration absorber. The system may also include a spring and damper in mechanical communication with the signal head. The spring provides resistance to the compression force of the signal head while the damper provides a damping force removing energy from the system. Also disclosed herein is a controllable damper which may be connected to a computing device for varying the damping of the system. The controllable damper may be a magneto-rheological fluid damper. The smart vibration absorber may be constructed as a retrofit for installation on current traffic signals supports.

The invention relates to a three-dimensional seism isolation system, which comprises preburied parts, first horizontal limit springs, a connecting plate, a horizontal slide bearing sliding plate, a horizontal slide bearing slider, upper slope leveling connecting plates, flush bolts, lead rubber bearings, second horizontal limit springs, lower slope leveling connecting plates and retaining blocks. Vertical seism is isolated by the deformation displacement of the inclined lead rubber bearings; horizontal seism is isolated by the sliding of the horizontal slide bearing slider; restoring force is supplied by the springs, and thereby the purpose of three-dimensional seism/vibration absorption is realized. The novel three-dimensional seism isolation system can protect protected objects of an upper building during horizontal and vertical vibration and seism and effectively attenuate the vibration transmission of vibrating equipment. The three-dimensional seism isolation system is applicable to the seism and vibration control and protection of building structures and large equipment.

A vibration, motion and dampening system is provided for use with air conditioning, mechanical or electro-mechanical equipment to reduce or eliminate the deleterious effects of vibration, movement and excessive noise created by the equipment. The system includes specially designed upper and lower channel frame members. The frame members receive geometrically compatible spring assemblies and plate members, as well as locking assemblies, wherein the assemblies are slidingly positioned with the frame members at desired locations. The spring assemblies and frame members receive and diminish the undesirable phenomena created by the equipment.

The invention discloses an active vibration absorber with a flexible structure and a control method thereof. The active vibration absorber comprises a signal acquisition unit and a control vibration absorption unit; in the signal acquisition unit, the flexible structure is provided with an ICP acceleration transducer, and a signal is transmitted to a constant current source, a data acquisition device and an analog/digital converter in turn and then transmitted to a computer to be processed; and in the control vibration absorption unit, a computer control signal is transmitted to the analog/digital converter and a first power amplifier and then transmitted to an actuator to execute vibration absorption. In order to simulate external excitation, the active vibration absorber is provided with an exciting force output unit, a signal generator of the unit is connected with an input end of a second power amplifier, a signal generated by the signal generator is amplified by the second power amplifier and then input to a vibration exciter, and the vibration exciter is connected with the flexible structure through a post rod to provide external disturbance. The method mainly comprises an off-line recognition process and a real-time control process. A random walk and input estimation method is introduced into active vibration control of the flexible structure, and good control effect is acquired from an experimental angle.

A hammock-type vibration-absorbing air sheath includes a first buffering wall having at least one first node, and a second buffering wall having at least one second node. The first buffering wall is bent along the first node, and the second buffering wall is bent along the second node. At least one first heat-sealed edge of the first buffering wall is connected to at least one second heat-sealed edge of the second buffering wall by heat sealing means. Thus, a receiving space is formed between the first buffering wall and the second buffering wall, while a buffering sheet is suspended within the receiving space for receiving an article. The buffering sheet is used to absorb vibrations of the article, while the first buffering wall and the second buffering wall are used to protect the article.

The present invention relates to a variable rigidity initiative power absorber applied to vibration damping for machinery, electrical equipment and noise control. The fault that the control band width of the passive control type absorber is too narrow, the control energy needed by initiative control type absorber is excessive and the vibration absorption effect of semi- initiative control type absorber is insufficient is solved. The structure feature of the absorber is that: an execution unit includes a base frame, the top of the base frame is disposed with a pair of base seats, the base seats are disposed with annular guide rods, and the two sides of the opening of the annular guide rod are respectively connected with magnetic current variable elastic bodies, the annular guide rods are connected with movable mass blocks, power mechanisms are disposed at the lower part of the power mass blocks. The invention has good vibration absorption effect, wide oscillation damping frequency band, less consume energy, the input energy is less than the initiative control absorber, therefore, the stability is better than the initiative control absorber; the absorber is simple in structure, easy in control method, and high in system reliability.

The invention discloses a thermoplastic styrene elastomer material and a preparation method of the thermoplastic styrene elastomer material. The thermoplastic styrene elastomer material is prepared from a styrene elastomer, filling oil, a polyolefin elastomer, polypropylene, an active inorganic packing, a lubricating agent, an antioxidant and a surface slipping agent. The VOC content of the prepared thermoplastic styrene elastomer material is less than 300ppm (VDA278 test standard); the hardness is less than 90A (Shore); the melt mass flux rate is greater than 40g/10min (ISO1133-1:2001, 230 DEG C, 2.16Kg); the density of the prepared thermoplastic styrene elastomer material is greater than 1.4g/cm<3>; the elongation at break is greater than 200%; and the thermoplastic styrene elastomer material has certain sound insulation and vibration absorption properties.

The invention provides an adjustable-inherent-frequency composite power vibration absorber and a control method of the adjustable-inherent-frequency composite power vibration absorber. The adjustable-inherent-frequency composite power vibration absorber comprises a signal collecting unit, a control unit and an executing unit, wherein the executing unit consists of two parts including a rigidity adjustment unit and a mass adjustment unit, the rigidity adjustment unit comprises a U-shaped base frame, excitation coils and a pre-tightening screw bolt are attached to the U-shaped base frame, a vibration absorption block is positioned between two magneto-rheological elastic bodies and is fixedly arranged between two clamp plates through the pre-tightening effect of the pre-tightening screw bolt, and a liquid storage box, a liquid pump and a liquid lower cavity are connected through a hose. The adjustable-inherent-frequency composite power vibration absorber and the control method have the advantages that the design structure is simple, the vibration absorption effect is good, an effective vibration reduction frequency band is wide, the performance is stable, the control response time is short, and practical values are very high; on the basis of the existing self-adaptation type vibration absorber, the effective vibration reduction frequency band is further widened, and the problem of too short effective vibration reduction frequency band of a traditional power vibration absorber is solved; the defect that an active type power vibration absorber excessively depends on external energy is overcome.

An on-road energy conversion and vibration absorber apparatus receives the kinetic energy from moving vehicles and pedestrians when being weighed down, and converts the received kinetic energy into a potential energy using a restorable elastic element compressing a fluid thereby storing the potential energy in a pressure chamber, and then conducting the pressurized fluid to pass though a check valve along a conduit and drive a vane wheel by releasing its potential energy. The vane wheel in turn drives a generator to generate electric energy, and the vibration of the vehicles is alleviated by cushion effect provided by the apparatus.

The invention provides a magnetorheological elastomer intelligent vibration absorber used for ships, which comprises an outer shell, a magnetorheological elastomer, a magnetic coil group and an internal iron core. The outer shell, the magnetorheological elastomer, the magnetic coil group and the internal iron core are together distributed on the same concentric circle. The inner surface of the outer shell is tightly connected with the outer surface of the magnetorheological elastomer by a bond. The inner surface of the magnetorheological elastomer is stuck into a whole body with the inside iron core by the bond. The coils are divided into four groups and are respectively twisted on the internal iron core. The invention is prepared by using the characteristic that the magnetic shearing rigidity of the magnetorheological elastomer is changed with the changing of the current, and has the advantages of simple structure, good vibration absorption effect, broad applicable frequency bands(using frequency bands of several HZ to scores of HZ), strong environment adaptive capacity(resisting oil stain and dampness), good stability (the control effect is not reduced after being used for a long period), etc.

Provided is a vacuum pump which can detect precisely physical contact between a rotor portion and a stator portion, and contact between the rotor portion and the stator portion that occurs as the amount of deposited solid product reaches the clearance between the rotor portion and the stator portion.

A vibration sensor is provided, taking advantage of a clearance, at the outer peripheral of a thread groove spacer. Contact between the rotor portion and the stator portion is decided, when a particular vibration during contact between the rotor portion and the stator portion exceeds a predetermined threshold value. The vibration sensor is mounted on the outer peripheral of the thread groove spacer at the end of the side of an exhaust port. The thread groove spacer is fixed on a casing via an elastic member (an O-ring) that have a vibration absorption (vibration damping) function of a cutoff frequency (fc1). A vibration signal outputted from the vibration sensor is converted into a digital vibration signal, and is inputted to a digital filter having a passing band of fc1 to fc2 [Hz]. If the vibration level of the vibration signal having passed through the digital filter exceeds a predetermined threshold value, it is detected that contact between the rotor portion and the stator portion has occurred in a turbo-molecular pump.

The invention provides a hydraulic driving four-footed robot with a space hybrid leg structure. The hydraulic drive space four-footed robot is composed of a rack and space hybrid legs which are symmetrical in structure; each hybrid leg comprises three hydraulic driving oil cylinders, a leg rack, a swing rod, a connection rod, thighs, shanks and feet; each hybrid leg is provided with three drivingdegrees of freedom; the hydraulic driving oil cylinder A drives the whole leg to carry out side swing movement; and the hydraulic driving oil cylinder B and the hydraulic driving oil cylinder C are capable of cooperatively driving the feet to carry out plane parallel movement output in the plane of a leg mechanism. The feet are connected through buffering so that vibration absorption, energy storage and reutilization can be finished in a striding period. Four legs are symmetrically distributed or equidirectionally distributed so that an omnibearing movement of the robot can be realized through a certain tread. The hydraulic driving four-footed robot with the space hybrid leg structure provided by the invention is simple in structure, easy to control and high in kinematic accuracy, has a high-speed response capability and a high bearing capability, and is applicable to high-speed and high-load transportation work and dangerous environment work under complicated non-structure topographic conditions in the wild.