79results about How to "Increase structural damping" patented technology

The invention discloses a minitype foil aerodynamic pressure bearing. The minitype foil aerodynamic pressure bearing comprises a bearing body, a top layer foil and a composite elastic wave foil structure, wherein the composite elastic wave foil structure is connected with the top layer foil for circumferential location, the composite elastic wave foil structure comprises an outer elastic wave foil and an inner elastic wave foil, the convex surface of the inner side of the composite elastic wave foil structure is connected with the tangent position of the outer surface of the top layer foil, the convex surface of the outer side of the composite elastic wave foil structure is contacted with the inner surface of the bearing body, and the bearing body has mounting, protecting and supporting actions; and a matching surface of the bearing and a rotating shaft is formed on the inner surface of the top layer foil. According to the minitype foil aerodynamic pressure bearing, the surface quality and the performance parameters of the wave foil are improved, the bearing damping and stiffness characteristics are improved, the bearing capacity and the impact vibration cushioning capability of the bearing are improved remarkably, and the life and the stability of the bearing are prolonged and improved.

The invention discloses a composite beam stayed cable-suspension cable cooperation bridge which comprises a bridge head, auxiliary piers, a steel girder, a concrete girder, a combining part girder, a transition region girder, a stayed cable, a transition region stayed cable, a main cable, a suspension cable, a transition region suspension cable and a length regulating device, wherein the steel girder is positioned in the middle of a bridge body; two ends of the steel girder are sequentially and fixedly connected to the concrete girder by virtue of the transition region girder and the combining part girder; the concrete girder is adopted at the whole or partial length of side span parts 12 at two ends of the bridge, and the side span parts 12 are supported on the auxiliary piers; The midspan region 13 of the midspan part of the bridge is equal to 1/311-2/311 and the midspan region is suspended by virtue of the main cable. The novel stayed cable-suspension cable cooperation bridge provided by the invention is high in structural rigidity, high in damping, good in economical efficiency, uniform and smooth structural rigidity transition of a steel-concrete combining part and a stayed cable-suspension cable transition region, and good in fatigue resistance.

The invention provides a high-efficiency and large-torque disk type switching magnetoresistive motor. The motor comprises a stator and a rotor, wherein both the stator and the rotor are in the shape of a yoke type round disk and comprise round disks and iron cores formed on the round disks; an integrated stator winding is wound on the iron core of the stator; and narrow magnetism isolating grooves which are arranged at intervals are radially formed in the iron core of the stator. The motor is simple in structure, high in efficiency and flexible in control method, can realize high-efficiency stepless speed regulation, and is very applicable to the application occasion requiring a short shaft, thin mounting, or low speed and large torque.

An anti-twisting novel soft steel energy dissipation device of a plane irregular structure comprises a locating connector 1, a first energy dissipation soft steel strip set 2, a second energy dissipation soft steel strip set 3, a first bolt hole set 4 and a second bolt hole set 5. Installation positions of soft steel energy dissipation strips can be accurately fixed through the arrangement of the locating connector. The soft steel energy dissipation device can not only improve rigidity of a building structure and improve structural damping, but also have effects of deformation and energy dissipation when the structure encounters an earthquake action and improve an earthquake resistant property of the structure, and meanwhile the soft steel energy dissipation device has functions of corrosion resistance and rust resistance, an installable/detachable function and other functions. The anti-twisting novel soft steel energy dissipation device of the plane irregular structure can be applied to not only a new-built structure, but also a reinforced improvement of an old building, and satisfies double needs of a newly-built building and an old building. With increasing complexity of a building structure form and increasingly improved requirements of people for building performance, the anti-twisting novel soft steel energy dissipation device of the plane irregular structure has a wide development space and wide engineering application prospect.

The invention discloses a metal corrugated-metal rubber composite material and a preparation method thereof. A matrix metal corrugated material and stamped type metal rubber are adhered together through adhesives to obtain a multifunctional composite porous material, and preparation of the metal corrugated-metal rubber composite material is realized; the metal corrugated-metal rubber composite material has wide application prospect in fields of transportation, mechanical manufacture and military, structural damping can be effectively increased, nonlinear and variable damping properties are achieved, earthquake, vibration and sound absorption of the structure can be improved, and high strength, high rigidity and excellent damping performance in machine-building industry can be exerted; in addition, the composite porous composite material has the advantages of total environmental adaptability, corrosion resistance, high-and low-temperature resistance, no ageing, vacuum non-volatilization and the like and is light, simple in manufacture, low in cost and long in service life.

This invention relates to vibration and noise control field, especially structure which can increase common component self damping and composite material using this structure. The component surface is continuously or alternately fixed with connector with concavo convex structure. The connector and binding body with corresponding concavo convex structure are cooperated. There is damping material between connector and binding body. This invention greatly increases the contacted and working area between damping material and component as well as binding body. It also increases applied moment the damping action applied on component bend neutral plane and bend axes. Thus, this invention can increase structural damping of components.

The invention discloses a novel active air foil bearing based on PZT and SMA. The novel active air foil bearing comprises a shaft sleeve, piezoelectric ceramics (PZT), a memory alloy wire mesh block (SMA block), flexible hinges, a rigid push rod, pre-pressure applying devices, a cooling pipe, a wave foil and a top foil; the PZT and the SMA block are installed in pre-machined through grooves, the corresponding pre-pressure applying devices are designed for the PZT and SMA block, the wave foil is formed by pressing an elastic material, one end of the wave foil is welded, and the other end of thewave foil is free. The top foil overlies the wave foil. Power supply signals of the PZT are controlled, the flexible hinges are coupled, PZT deformation is amplified, the wave foil is supported by the rigid push rod, the wedge-shaped space is enlarged, therefore, the crossed coupling effect is weakened, the dynamic pressure effect of the bearing is enhanced, and the rigidity characteristic of thebearing is improved; by controlling the temperature of the SMA block, the SMA block expands and contracts to generate larger structural damping, and the damping characteristic of the bearing is improved; and finally, the rigidity and damping characteristics of the bearing are actively controlled, and the stability of the system is improved.

The present invention discloses a ductile prestressed concrete structural member and its production method. Said member includes concrete and prestressed reinforcement, the described concrete compression strength is greater than 60MPa, and the described prestressed reinforcement is prestressed stranded wire, its strength is greater than or equal to 1860 MPa, its relaxation rate is less than or equal to 2.5% and percentage elongation is greater than or equal to 5%. The bending deflection ductility ratio of the prestressed concrete structure meeting the above-mentioned technological parameters is greater than 3.0, and said prestressed concrete structure is superior to general concrete structure in ductility.

The invention relates to a composite material viscoelastic damping rod which comprises mounting flanges at two ends and an intermediate rod between the mounting flanges, wherein the intermediate rod comprises three layers which are a rod body (1), a viscoelastic damping layer (2) and a restraint layer (3) of T series high-intensity carbon fiber composite materials from inside to outside sequentially, and the length of the intermediate rod is 200-1000mm; a damping rubber material with the dissipation factor greater than 1 is selected for the viscoelastic damping layer (2) to be pasted to the outer part of the rod body (1); M series high-modulus carbon fiber composite materials are selected for the restraint layer (3), and the damping layer (2) and the restraint layer (3) are molded by adopting a co-curing technology; and the intermediate section is divided through opening a U-shaped groove out of the restraint layer (3), and the number of the sections of the intermediate rod at the length direction is 3-12.

The invention relates to a gas treatment device for an electric control room under a coal mine. The gas treatment device comprises a hollow shell and an airflow guide pipe used for guiding the airflow, wherein the shell comprises a cylindrical part and a circular cone part, wherein the upper end of the cylindrical part is in a cylindrical shape, and the lower end of the circular cone part is in acircular cone shape; the shell wall of the circular cone part is internally provided with a cold airflow channel; the inner wall of the circular cone part is provided with a plurality of aeration spacer plates which incline downwards; the plurality of aeration spacer plates are arranged up and down at intervals and are arranged on the inner wall of the circular cone part at the equal intervals; each aeration spacer plate is internally provided with an airflow channel I, and the airflow channels I are communicated with the cold airflow channel of the circular cone part; the aeration spacer plates are separately provided with an air nozzle structure used for discharging cold air; a material dispersing cone is arranged at the middle lower part of an inner cavity of the circular cone part, andthe bottom end of the circular cone part is provided with a plurality of outlet pipes. The gas treatment device can be arranged at a gas inlet of the electric control room in a matching way, so thatthe external oily and dusty gases can be effectively treated by purifying, the air quality in the electric control room is improved, the safety of electrical equipment of the coal mine is improved, and the service life of the electrical equipment of the coal mine is prolonged.

An impact-resisting damping device with multi-freedom-degree high-damping viscoelastic damping semi-spheres is characterized in that the damping device is a sealed hexahedron device combined by a damping base, two damping cavity lateral covers, a damping cavity front cover and a damping cavity upper cover. A mechanical structural component inner cavity is formed in the vibration damper. The damping semi-spheres are attached to the entire inner wall of the mechanical structural component inner cavity. A damping cavity for mounting damping parts is formed in vibration damper. The damping base comprises a front positioning seat, a damping cavity base plate and a damping cavity rear plate. Each semi-sphere is made of high-viscoelasticity, high-damping and multi-freedom-degree polyether urethane materials. By the damping device, normal operation of highly-sensitive equipment under vibration and impact can be guaranteed.

The invention relates to a gas purifying chamber for coal mine electrical equipment. The gas purifying chamber for the coal mine electrical equipment comprises a sealed cavity body structure with an internal space formed by abutting a plurality of wall plates, wherein a sound insulating plate is arranged in a sealed cavity body, and a certain ventilation gap is arranged between the lower end surface of the sound insulating plate and the bottom wall plate of the sealed cavity body; the other end surfaces of the sound insulating plate are sealingly connected with the inner wall of the sealed cavity body, and the space of the sealed cavity body is divided by the sound insulating plate into a ventilation cavity and a purification cavity; the ventilation cavity is communicated with an air inlet, and the air inlet in the ventilation cavity is sequentially connected with a coarse filter, a purifier and a drying box through connecting pipelines; the dirty air discharged through the air inlet is sequentially processed by the coarse filter, the purifier, the drying box, and enters the purification cavity through the ventilation gap to realize the air circulation. The gas purifying chamber can coarsely filter, purify and dry the external oily and dusty gas effectively, thereby improving the air quality in an electric control room, improving the safety of the coal mine electrical equipmentand prolonging the service life.

The invention discloses a vibration reducing device for restraining wind-induced vibration of a lifting rod of a large-span suspension bridge, which is an auxiliary cable net system arranged on a suspension bridge lifting rod (2); the auxiliary cable net system is a netty structure formed by across arranging multiple auxiliary cables (1); included angles between the auxiliary cables (1) and the lifting rod (2) are 30-70 degrees; and in a connecting area (8) of the auxiliary cables and the lifting rod, the auxiliary cables (1) and the lifting rod (2) are fixedly connected by bolts through two second connecting devices (10) at two sides of the lifting rod (2), connecting clamping pieces (81) of two auxiliary cables at two sides of the two second connecting devices (10) and the lifting rod and rubber washers between the connecting clamping pieces (81) of the auxiliary cables and the lifting rod and the lifting rod (2). The vibration reducing device is simple in connecting structure, has the advantages of convenience for installation and maintenance construction, and can be convenient to replace cable bodies in the use period.

The invention relates to a vibration damping structure for portable electronic equipment and a laptop. The vibration damping structure for portable electronic equipment comprises a casing, a damping cavity arranged on the casing, a cover board covering the damping cavity and damping parts arranged in the damping cavity. The damping cavity can be independent or a plurality of sub-aspect damping cavity divided by a separator and the damping parts can be particles, small rods or plates. When the vibration damping structure for portable electronic equipment of the invention vibrates periodically or non-periodically especially randomly due to vibration, drop and other external shocks, the damping parts enclosed in the cavity will move and lose a large amount of energy by mutual collision, thus absorbing and consuming a substantial amount of vibration energy and reducing the harm caused by vibration. The damping structure is compact, thin and light weighted and the damping does not change within a temperature range of minus forty DCG to eighty DCG, which represents the excellent property of the damping structure.

The invention discloses an interlayer reinforcement component of a cold-bent thin-wall type steel house. The interlayer reinforcement component is characterized by being of a truss type structure and comprising four upright steel bushings (4) with rectangular projections, and hollow supports (5) which are fixed at two ends of the steel bushings (4) and are coaxial with the steel bushings (4), wherein horizontal transverse steel bars (6) or horizontal longitudinal steel bars (7) are welded between every two adjacent hollow supports (5); oblique steel bars (1) with equal lengths are welded on the hollow supports (5) at four corners of each of front and rear side walls formed by the horizontal transverse steel bars (6) and the steel bushings (4) along the diagonal direction; the far end of each oblique steel bar (1) is welded on a perforated steel plate (2); reinforcement hoops (3) are welded alternately on the steel bushings (4). The reinforcement component is applicable to the cold-bent thin-wall type steel house which is of a multilayer house beam column structure; the force transmission path is direct and reliable; the lateral resistant ability and the capability of bearing the vertical load action of the whole structure can be obviously improved.

The invention discloses a multi-mass-sheet two-side clamping device for rail vibration reduction. The multi-mass-sheet two-side clamping device comprises elastomers, supports, elastomer-steel member assemblies, pressing plates, first locking pieces, second locking pieces, pressing bars with pressing ends, leaf springs and rail gaskets, wherein the elastomers, supports, the elastomer-steel member assemblies, the pressing plates, the first locking pieces, the second locking pieces and the pressing bars with pressing ends are arranged on the first side and the second side of a rail, and the leafsprings and the rail gaskets are located on the pressing plates and the elastomer-steel member assemblies; the spring gaskets and the elastomer-steel member assemblies are attached to the rail, so that the vibration impact of a train on the rail is retarded; the elastomer-steel member assemblies increase structural damp of the rail and adjust the vibration frequency of the rail to be close to thefrequency of a main structure, and the resonance characteristic of the structure is changed, so that the vibration reduction and noise reduction effects are achieved. The multi-mass-sheet two-side clamping device can greatly reduce the energy transmitted by wheels and the rail, prevents the generation of vibration and noise, greatly prolongs the service life of the wheels and the rail, is beneficial to reduction of the use cost of a railway and noise pollution, is convenient to replace and disassemble, and has a very strong practical value and application prospect.

The invention belongs to the technical field of mechanical equipment, and in particular relates to a flexible assembly and a dynamic pressure radial gas bearing. The variable range of stiffness is limited due to the fact that in a traditional foil bearing structure, the wave foil arch bottom only contacts with the upper surface of a bearing seat in one direction; and at the same time, the effect of friction damping on energy dissipation is poor due to the fact that the space of a wave foil bearing structure is not fully utilized. The flexible assembly comprises a first foil group and a secondfoil group, the first foil group intersects with the second foil group, and the space phase of the first foil group is opposite to the space phase of the second foil group; and the flexible assembly is provided higher structural damping. According to the dynamic pressure radial gas bearing, by adopting the flexible assembly, the limited working space of the foil bearing is fully utilized, the contact area among the flexible assembly and the flat foil surface and the bearing seat surface is increased, bearing friction damping is improved, thus energy dissipation in the bearing is enhanced, andthe stability of a rotor-bearing system is effectively maintained.