70results about How to "Improve vibration isolation efficiency" patented technology

The invention discloses a method for controlling structural acoustic transmission on the basis of a combined type vibration isolation device. The method includes steps of S1, determining the required combined type vibration isolation device according to parameters of isolated mechanical equipment; S2, vertically placing the isolated mechanical equipment on the combined type vibration isolation device; S3, adjusting the weight of a middle counterweight of the combined type vibration isolation device; S4, adjusting the natural frequency of the combined type vibration isolation device so that the natural frequency of the combined type vibration isolation device is lower than the structural vibration acoustic transmission frequency generated during operation of the isolated mechanical equipment; and S5, fixing the isolated mechanical equipment. The method has the advantages that propagation of noise of high-frequency structure is controlled by a combined type vibration isolation system, the vibration isolation device is arranged between the isolated mechanical equipment and a carrying foundation, performance parameters of upper and lower vibration isolators, a damper and the middle counterweight are matched with one another, the middle counterweight absorbs energy, and the spring and rubber isolators effectively isolate vibration, so that energy transmission of the structural noise is reduced, and the structural acoustic transmission of mechanical vibrating equipment is efficiently isolated.

The invention discloses a spring vibration isolating device based on self-adaption electromagnetic damping. The spring vibration isolating device comprises a shell, a loading platform above the shell, a radial magnetic field generating unit in the shell, an electromagnetic damping generating unit in a radial magnetic field and a spring vibration isolating unit supporting the loading platform. A processing unit and a detecting unit sensing outer exciting force borne by the loading platform are further included. The processing unit controls the starting state of the electromagnetic damping generating unit according to an outer exciting force signal sensed by the detecting unit, and the direction and degree of electromagnetic damping force acting on the spring vibration isolating unit are generated. The invention further discloses a vibration isolating method based on the device. The self-adaption electromagnetic damping force is provided for the spring vibration isolating unit, and under the condition of keeping the low fixed frequency of the spring vibration isolating device, the vibration isolating requirement under different work conditions (different exciting frequencies) can be met by a vibration isolator.

The invention provides an equipment floor pipe vibration isolation structure. The equipment floor pipe vibration isolation structure is composed of a pipe vibration isolation assembly installed below a pipe and a lower vibration isolation structure installed between the pipe vibration isolation assembly and a floor. The pipe vibration isolation assembly is composed of a pipe bearing support, an elastic vibration absorption pad and an upper adjustable spring vibration isolator. The pipe bearing support is an integrated assembly formed by welding an arc-shaped steel plate, force-bearing steel plates on the two sides and a stiffening plate. The lower vibration isolation structure is composed of a vibration isolation weight block, a bearing steel structure, a lower adjustable spring vibration isolator and a rubber anti-vibration pad and the vibration isolation weight block is an integrated assembly composed of a steel plate frame structure and a counter weight. The equipment floor pipe vibration isolation structure can effectively control solid structure transmission of pipe vibration and is high in vibration isolation efficiency. Moreover, the height of the vibration isolation structure can be adjusted according to needs and load balancing of related equipment and pipes is guaranteed.

The invention discloses a double-layer active-passive electromechanical integrated type vibration isolation device. The double-layer active-passive electromechanical integrated type vibration isolation device comprises a passive upper rubber vibration isolator (a), an intermediate framework structure (c), a mounting bottom plate (d), four electromagnetic exciters (b), integrated type control signal conditioning equipment and acceleration signal conditioning equipment (f), the intermediate framework structure (c) is arranged between the upper rubber vibration isolator (a) and the mounting bottom plate (d), the four electromagnetic exciters (b) serve as active executing mechanisms symmetrically arranged at the left and right sides of the intermediate framework structure (c), and the integrated type control signal conditioning equipment and acceleration signal conditioning equipment (f) are symmetrically arranged in front and rear grooves of the intermediate framework structure (c). The double-layer active-passive electromechanical integrated type vibration isolation device can well inhibit the vibration due to wide-frequency band external disturbance excitation, and the double-layer active-passive electromechanical integrated type vibration isolation device is mainly used for controlling the vibration of different kinds of marine diesel engines, steam turbines, pumps, the like rotating and reciprocating mechanical equipment, nuclear emergency power generator sets and the like large power equipment.

The invention relates to a segmented flexible isolation bag, device and method. The segmented flexible isolation bag comprises an inner membrane which encloses an empty cavity; the outside of the inner membrane is covered with an outer protective layer; the empty cavity is filled with an isolation medium and includes an upper empty cavity, a middle empty cavity and a lower empty cavity arranged from top to bottom and isolated from one another; the upper empty cavity is as large as the lower empty cavity in volume; the middle empty cavity is greater than the upper empty cavity in volume; the pressure upon the isolation medium in the middle empty cavity is less than that of the isolation medium in the lower empty cavity. Empty ditches can be filled with the segmented flexible isolation bag instead of gravels; collapse of the empty ditches is avoided, and it can be avoided that vibration is transferred to a protective zone from the isolation bag.

The invention discloses a vibration isolator in a floating slab track system and a method for determining operating parameters of the vibration isolator. The vibration isolator is disposed between a floating slab of the floating slab track system and a track foundation, and comprises parallel steel springs, damping fluid and controllable Coulomb damping elements. The method comprises the steps: in the case of not considering Coulomb damp, establishing a vehicle-floating slab track coupling dynamics time-domain analysis model, taking maximum vertical vibrating displacement of a floating slab and a steel rail as a control index, determining a minimum supporting rigidity Ka of the floating slab without considering the Coulomb damp, then determining a displacement threshold value of floating slab by combining a floating slab vertical vibration displacement time travel curve characteristic under the minimum supporting rigidity working condition without considering the Coulomb damp, determining the magnitude of a Coulomb damping force and an operating time period, and finally calculating the minimum supporting rigidity Kb with the Coulomb damp by utilizing a vehicle-controllable Coulomb damp vibration isolator floating slab track coupling dynamic time-domain analysis model. The vibration isolation efficiency of the traditional steel spring floating slab track can be effectively improved.

The invention relates to a vibration isolation system with back pressing devices, and belongs to the technical field of vibration reduction of civil engineering structures. The vibration isolation system is used for controlling influences of vibration of machinery equipment on external environments or relieving influences of vibration of the external environments on the machinery equipment. The vibration isolation system comprises a counterweight bench and vibration isolators, the vibration isolators are located between a base and the counterweight bench which is supported on the vibration isolators, elastic supporting elements are arranged in the vibration isolators, and the elastic supporting elements are at least composed of metal helical springs; and the vibration isolation system further comprises the back pressing devices, each back pressing device comprises a back pressing elastic element and a connecting part, one end of each back pressing elastic element acts on the counterweight bench, the other end of each back pressing elastic element acts on the corresponding connecting part, the connecting parts is connected with the base or vibration isolator bases, and the direction of acting force of the back pressing elastic elements on the counterweight bench is opposite to that of supporting force of the elastic supporting elements on the counterweight bench. Compared with the prior art, according to the vibration isolation system with the back pressing devices, the inherent frequency is easy to control, and the vibration isolation effect is better guaranteed.

The invention relates to the technical field of structural vibration control and discloses a vibration isolator. The vibration isolator comprises a steel plate spring, a first air spring, a second air spring, a foundation and a device waiting vibration isolation, wherein the first air spring and the second air spring are horizontally arranged and are located on the two sides of the device waiting vibration isolation, and the two ends of each of the first air spring and the second air spring are hinged to the foundation and the device waiting vibration isolation respectively through bolts; the two air springs provide non-linear restoring force and damping force for the device waiting vibration isolation and guarantee that the device waiting vibration isolation moves in the vertical direction; the steel plate spring is horizontally arranged and provides linear and elastic support for the device waiting vibration isolation, and the two ends of the steel plate spring are fixedly connected to the device waiting vibration isolation and the foundation respectively through bolts. The vibration isolator has the advantages that the static deformation can be effectively reduced, and therefore the static rigidity can be improved, and the stability of a system can be improved; the inherent frequency of the system can be effectively lowered, and therefore the vibration isolation area can be expanded, and the vibration isolation efficiency can be improved; the transmissibility of a resonance region and a vibration isolation region can be simultaneously and effectively lowered, and therefore the vibration isolation effect of the vibration isolator can be improved.

An automatic height adjustment valve of an optical vibration isolation platform comprises a lever plate, a hinged support, an ejector pin, an insert bushing, an upper steel bushing, a lower steel bushing, a valve element, a valve body, compressed springs, thin seal rings and the like. According to the automatic height adjustment valve of the optical vibration isolation platform, the structure is simple, the performance is stable and reliable, the reset accuracy is high, the response time is short, and the automatic balancing speed is high; the size is small, and the installation and the adjustment are very convenient. The automatic height adjustment valve of the optical vibration isolation platform can adjust the height of the optical vibration isolation platform automatically and has the advantages of being high in response speed and high in sensitivity.

The invention discloses a satellite sensitive load system and a magnetic levitation nonlinear vibration isolator and a design method thereof. Aiming at the performance index requirement of isolated load, magnetic field force of a series magnetic levitation system is analyzed to obtain the influence on the system rigidity from the diameters of different permanent magnets and the widths of different air gas so as to form the magnetic levitation nonlinear vibration isolator with three permanent magnets in serial connection; and the magnetic levitation nonlinear vibration isolator is provided with an output rod only moving in the axial direction, and is encapsulated by a shell. A vibration isolating system formed by the magnetic levitation nonlinear vibration isolator is mounted between a satellite platform and a satellite sensitive load. The magnetic levitation nonlinear vibration isolator has such advantages as no contact, nonlinearity, variable rigidity, small amplitude and low rigidity, and large amplitude and high rigidity, and can effectively isolate the transfer of vibration to achieve the purpose of wide-frequency vibration isolation when being capable of bearing the weight of a vibration-isolated object and guaranteeing the manufacturability.

The invention belongs to the field of vibration control technology on the electromechanical device, specifically, a beam type three-direction vibration isolator. The vibration isolator is composed of 12 spring beams. Wherein, two groups of spring beams (four beams) are respectively connected by a rigid block to form a crisscross beam support, two crisscross beam supports are formed a whole spacial crisscross beam support by four equal-length vertical spring beams by eight rigid blocks. The upper and the lower rigid blocks in the middle are respectively connected with a vibrating body and vibration isolation object; in this way, the vibration isolation purpose can be realized at three directions. The vibration isolator is simple in structure, low in cost, convenient to install and can be applied for the vibration isolation in fields of aviation, spaceflight, electronic product, mechanical equipment, transportation, communication and so on.

The invention provides a high-rise suspension detecting structure micro-vibration control device. The device comprises a steel rigid T-shaped table (1) which is a horizontal platform and is used for placing a radar inspected device and supporting a frame weight to maintain the balance thereof, a stopper system which comprises a class I stopper (2) and a class II stopper (4) and is used to preventimpact vibration and a sudden load from causing the steel rigid T-shaped table (1) to be separated from a supporting device to improve the stability. The class I stopper (2) is used to limit the relative position of the steel rigid T-shaped table (1) and an air spring in an air floating system (3). The class II stopper (4) is used to limit the relative position of a supporting rigid frame column (5) and an air spring in the air floating system (3). The device further comprises the air floating device (3) which is provided with 6 air springs to ensure stable horizontal face of the steel rigid T-shaped table (1), and a building structure basic floor (10) which is used to withstand the full load of a building and transfer the load to the foundation to realize anti-vibration.

The invention discloses an inertial component independent control method used for helicopter main reduction anti-resonance vibration isolation. The method comprises the following steps of in a finite element model and a solid model of a main reduction vibration isolation system, carrying out simulation measurement to acquire four mass block positions of the main reduction vibration isolation system and a corresponding anti-resonance frequency sample; using a BP neural network method to train the finite element model and a solid model quality block position prediction neural network; taking a minimum of a maximum variation of a single mass block position as a constraint condition, and in the finite element model and the solid model, determining an optimal mass block position by multiple sets of neural networks; using an integrated frequency tracking algorithm and a neural network algorithm to compile a control program for controlling independent motion of a mass block; and according to a measured excitation frequency, driving each mass block to a predicted optimal mass block position by a motor so that the system quickly recovers a vibration isolation effect. In the invention, vibration isolation efficiency can cover all frequencies of a frequency band, and a vibration isolation system can recover the vibration isolation effect quickly when external excitation changes.

The invention belongs to the field of mechanical shock isolation, and particularly discloses an impact-resistant multi-degree-of-freedom composite vibration isolator and a vibration isolation system.The vibration isolator comprises a mounting assembly, a vibration isolation assembly and a positioning assembly, the mounting assembly comprises a central shaft and a base mounted at the lower end ofthe central shaft, and the upper end of the central shaft is disc-shaped; the vibration isolation assembly comprises a shell and an elastic element, the shell sleeves the central shaft and is locatedbetween the base and the upper end of the central shaft, a cavity structure is formed between the inner wall of the shell and the outer wall of the central shaft, and a flat plate structure is arranged on the outer wall of the shell; the elastic element comprises an inner vibration isolation piece and an outer vibration isolation piece, the inner vibration isolation piece is installed in the cavity structure and comprises a radial elastic piece and an axial elastic piece which are arranged up and down, and the shell is sleeved with the outer vibration isolation piece; the positioning assemblyis mounted between the mounting assembly and the vibration isolation assembly; and the vibration isolation system comprises the vibration isolator. Effective isolation of multi-directional violent impact response can be realized, and the vibration isolator has the advantages of good isolation effect, simple structure and the like.

The invention discloses a vibration damper of airborne crystal oscillator. The vibration damper comprises a damping frame and an installation base, wherein a crystal oscillator installation part is arranged on the damping frame, the damping frame is connected with the installation base through a plurality of sets of steel cables, copper pipes are connected to the steel cables in a pressing mode, and the steel cables are connected with the damping frame and the installation base through the copper pipes respectively. When external vibration acts on the installation base, the external vibrationis transmitted to the vibration reduction frame after passing through the multiple sets of steel cables of the spatial three-dimensional structure, and the airborne crystal oscillator is rigidly installed on the vibration reduction frame. External strong vibration is transmitted to the crystal oscillator after being transmitted and attenuated by the vibration reduction device, energy transmitted to the crystal oscillator by the vibration is attenuated to different degrees along with the change of excitation frequency, the phase noise of the crystal oscillator is improved, and the anti-vibration performance of the crystal oscillator under the strong vibration condition is realized. The vibration damper has the advantages of being low in frequency, high in vibration isolation efficiency, small in magnification factor, wide in temperature range, light in weight and the like, can be used for rapid installation of airborne crystal oscillators of various specifications and models, and is lowin cost and easy and convenient to use and maintain.

The invention provides an eight-strut type multi-degree-of-freedom dynamic anti-resonance vibration isolation device which belongs to the field of helicopter vibration control. The device comprises aload platform, a foundation platform, a plurality of upper connecting blocks, a plurality of lower connecting blocks and eight strut assemblies. The upper connecting blocks are uniformly distributed on that same circumference of the low end face of the load platform; the lower connecting blocks are evenly distributed on the same circumference of the upper end face of the foundation platform; eachstrut assembly is composed of a liquid elastic vibration isolator, one end of which is connected with an upper connecting block and the other end of which is connected with a lower connecting block. The invention blocks the transmission of the multi-directional rotor hub force with the frequency f=N omega to the body through the dynamic anti-resonance effect of the liquid elastic vibration isolator, the vibration isolation frequency can be stabilized at f=N omega. In addition, the eight strut assemblies can realize redundant vibration control, so the vibration isolation device has certain anti-crash performance.

The invention discloses an active and passive integrated vibration isolator system which comprises a signal collecting device, a control device and a vibration damper. The signal collecting device collects vibrating signals of mechanical equipment and transfers the signals to the control device, the control device controls the vibration damper to conduct vibration attenuation according the signalsby means of an FxLMS algorithm, and the vibration damper comprises a shell, the passive vibration isolator arranged in the shell and fixedly arranged relative to the shell and an electromagnetic actuator, wherein the passive vibration isolator is connected with the electromagnetic actuator in series through a decoupling film, the decoupling film of the electromagnetic actuator and an active vibration damper are connected through a shaft sleeve, the shaft sleeve is fixed to the active vibration damper, and the passive vibration damper is fixed to the shaft sleeve. The passive vibration damperis formed by a rubber main spring, upper and lower liquid chambers, an inertia channel and the decoupling film, and the projected area of the decoupling film is smaller than that of the area of the main spring by 1/2.

The invention provides a large-scale optical instrument transportation vibration protection system, and a protection structure form which combines a six-degree-of-freedom vibration isolation device and a four-line pendulum structure is formed. The large-scale optical instrument transportation vibration protection system comprises a vibration protection structure upper part and a vibration protection structure lower part which jointly form a transportation accompanying vibration protection structure, the vibration protection structure upper part is composed of an outer frame structure (3), a vibration isolation catenary unit (1) and a vibration isolation inhaul cable unit (5), the vibration protection structure lower part is composed of a structure base (9), a horizontal and vertical multi-dimensional vibration isolation element (8) and a rack middle connecting plate (7), the large-scale optical instrument transportation vibration protection system further comprises a turnover device and a limiting damping pad (6) which is located on the side face of the turnover device (4) in the vertical direction, the turnover device is a prefabricated part with certain rigidity and bearing capacity, a bolt hole is reserved at the bottom of the turnover device, and the turnover device can be connected with the rack middle connecting plate (7). The large-scale optical instrument transportationvibration protection system has the advantages of being low in inherent frequency, efficient in vibration isolation and high in stability, and the vibration protection problem in the transportation process of large optical instruments can be effectively solved.

The invention provides a vibration isolation structure of a plate heat exchanger of an equipment layer air conditioning system. The vibration isolation structure of the plate heat exchanger of the equipment layer air conditioning system is formed by a plate heat exchanger main body vibration isolation structure and a steel column vibration isolation structure; the plate heat exchanger main body vibration isolation structure is formed by a rubber vibration isolation cushion, a bearing steel structure, a rigid quality block, an adjustable spring vibration isolator and a galvanized bearing steel plate and arranged between a plate heat exchanger main body and the floor; the bearing steel structure is arranged between a heat exchanger base, a lower steel beam and a ground beam; one side of the bearing steel structure is arranged under the plate heat exchanger main body and the other side of the bearing steel structure is arranged outside the plate heat exchanger main body; the steel column vibration isolation structure is formed by bearing structures, an adjustable spring vibration isolator and a rubber vibration isolation cushion; the bearing structures are arranged on the bilateral sides of a steel column. According to the vibration isolation structure of the plate heat exchanger of the equipment layer air conditioning system, the solid structure transmission of vibration of the plate heat exchanger main body and the steel column can be effectively controlled and the vibration isolation structure can be arranged under the condition that the installation of the plate heat exchanger and related equipment and pipes is achieved.

The invention discloses a magnetic suspension active vibration isolator and a vibration isolation method. Vibration isolation equipment is supported through a supporting piece, and the supporting piece is supported through a base; the supporting piece and the base are each provided with a magnetic device and a disturbance force collector, a magnetic suspension state can be formed between the supporting piece and the base through the magnetic devices, and disturbance force of the equipment and the ground is obtained through the disturbance force collectors of the supporting piece and the base;and the magnetic devices of the supporting piece and the base are connected to a control system, according to the obtained disturbance force signal condition, the disturbance force can be corrected while the magnetic suspension state is formed between the supporting piece and the base, and the purpose of vibration isolation is achieved. The magnetic suspension active vibration isolator can collectvibration disturbance force signals of the equipment and the ground and feed the vibration disturbance force signals back to the control system in time, the magnetic suspension active vibration isolator generates acting force opposite to the disturbance force, and therefore the vibration disturbance force of the ground and the equipment is offset, the equipment is stable, and accurate running andthe service life of the equipment are guaranteed.