322results about How to "Good damping properties" patented technology

The invention concerns a method and a device for inspecting pipelines, in particular for detecting defects in pipelines by means of ultrasound. Towards this end, measuring sensors transmit ultrasound signals during passage through a pipeline. The signals reflected on boundary regions of a pipeline wall, e.g. surfaces or defects, are then measured and evaluated. The invention is characterized in that partial regions of the measuring sensors (virtual sensors) formed of a plurality of neighboring sensor elements irradiate ultrasound signals into the pipe wall at at least one radiation angle which is inclined with respect to the normal to the pipe wall and the signals reflected at boundary regions of the pipe wall are received by same and / or other partial regions of the respective measuring sensors, wherein defects in the pipe wall are determined by evaluation of the acoustical signals reflected by different boundary regions.

The invention belongs to the technical field of vibration and noise control and relates to a relatively-high-applicability passive isolation technology for ultralow-frequency vibration. In order to effectively solve the problem between the low-frequency vibration transmissibility and the high-frequency vibration attenuation rate of the vibration isolator, the invention provides the stiffness-adjustable magnetic vibration isolator with quasi zero stiffness, which adopts rectangular permanent magnets generating negative stiffness and an elastic capsule providing positive stiffness; and when a load is changed, the working position of the elastic capsule is controlled unchanged, the positive stiffness of the elastic capsule is changed because the pressure inside the elastic capsule is changed, and then, the negative stiffness is matched with the positive stiffness through regulating the distance among the rectangular magnets, so that the stiffness-adjustable magnetic vibration isolator with quasi zero stiffness is adaptable to vibration isolation objects with different weights. The stiffness-adjustable magnetic vibration isolator with quasi zero stiffness is simple in structure, convenient to mount, adjustable in bearing capacity, excellent in vibration isolation property, compact in structure, light in weight and suitable for popularization and application.

The invention relates to a piston pump with a piston received axially displaceably in a pump bore. To improve the aspiration performance of the piston pump. A cuff with a U-shaped annular cross section is provided, the cuff is inserted into the pump bore surrounding the piston, an outer lip forms a diaphragm, which rests against a wall of the pump bore and is acted upon on its outside with ambient pressure through a venting bore. The cuff is part of a fluid storage element, which makes an additional fluid volume available to the piston pump. The diaphragm acted upon by ambient pressure creates a pumping effect, if a fluid pressure in the fluid storage element drops below ambient pressure in an intake stroke of the piston.

An elastomeric O-ring compressed between a laminated plastic grip panel and a pistol grip frame provides a vibration dampening structure for a pistol. The elastomeric O-rings are placed around fastener bushings on the grip frame. The grip panels are secured to the grip frame by inserting threaded fasteners through fastener holes in the grip panel into the fastener bushings. Each O-ring is received by the grip panel in a corresponding annular recess that has a depth that is less than the diameter of the O-ring. When the threaded fasteners are tightened, the elastomeric O-rings are compressed between the grip frame and the grip panel. The compressed O-rings prevent loosening of the threaded fasteners by improving the vibration dampening characteristics of the pistol and by increasing frictional pressure between the grip panel and the head of each threaded fastener.

The invention belongs to the technical field of rubber and discloses an ultra-high damping rubber composite material and a preparation process of the rubber composite material. The preparation process disclosed by the invention is mainly technically characterized by comprising the following steps of: adding short fibers, carbon black, petroleum resin, a plasticizer, a vulcanizing agent, an active agent, an accelerant and an anti-aging agent in rubber; and mixing the components in an internal mixer and then vulcanizing in a flat vulcanizing machine. According to the ultra-high damping rubber composite material disclosed by the invention, a predetermined amount of short fibers, carbon black and petroleum resin are uniformly dispersed in a rubber matrix; compared with the common high-damping material, the damping coefficient of the ultra-high damping rubber composite material disclosed by the invention is increased by more than 20%; and the ultra-high damping rubber composite material disclosed by the invention has the advantages of being strong in energy consumption property and ductility and obvious in damping and shock insulating effects, effectively controlling the earthquake response of shock insulating structures, and being environment-friendly and stable in property. The stretching strength is greater under the condition with the same hardness, so that a rubber bearing prepared by the ultra-high damping rubber composite material disclosed by the invention is greater in bearing force; the whole size of the bearing is smaller than the size of the traditional high-damping rubber bearing; and the rubber bearing has the advantages of saving the use space, being convenient to construct and more excellent in resistance to fatigue performance.

The present invention teaches a method for enabling the formation of a high damping composition. The method includes mixing a centipede polymer, i.e., a poly(disubstituted ethylene-co-maleimide) polymer, and plasticizers or extenders within a non-vulcanized thermoplastic elastomer to form a relatively high damping gel composition.

An acceleration sensor has a substrate, a seismic mass and a detection unit. The seismic mass is configured to be deflected based on an external acceleration acting on the acceleration sensor, the deflection being in the form of a deflection motion with respect to the substrate along a deflection direction. The detection unit is configured to be deflected for the detection of a deflection of the seismic mass, the detection being in the form of a detection motion with respect to the substrate along a detection direction. The detection unit is connected to the seismic mass in such a way that the amplitude of the deflection motion along the deflection direction is greater than the amplitude of the detection motion along the detection direction.

A rotor aircraft has a fuselage with a rotor mounted above by a rotor shaft. An arm is pivotally engaged with a lower portion of the rotor shaft and pivotally engaged with the fuselage, enabling the rotor to move with little restriction vertically and horizontal in all directions relative to the fuselage as the rotor rotates in order to isolate rotor oscillations. An infinitely variable air spring is used to counter vertical and fore and aft loads. Damping in the form of elastomeric materials, piston seal friction, and fluid flow through an orifice may be added as required.

A hydrodynamic coupling device includes an impeller wheel with an impeller shell and a vane arrangement and a turbine wheel with a turbine shell and vane arrangement. The vane arrangements of the impeller wheel and the turbine wheel form a hydrodynamic circuit. A lockup clutch is constructed with an axially movable piston for transmitting torque by the application of pressure in the direction of a primary flange of a clutch housing via at least one friction facing provided axially between the piston and the primary flange. The lockup clutch has a torsional vibration damper with a drive-side transmission element and a driven-side transmission element which is movable relative to the latter, each of which is provided with driving means for elastic elements. The torsional vibration damper has a damping device that penetrates axially, at least along part of its axial extension, into an annular space that is enclosed by the turbine wheel and at least partially enclosed by the impeller wheel such that the damping device is arranged radially inside of the hydrodynamic circuit. The annular space is formed by an axial bulge of a radial lengthening of the turbine shell. The radial lengthening projects radially inward up to the turbine hub. The axial bulge approaches the side of the clutch housing remote of a drive up to the width of a gap, and this gap has a width which is sufficient to ensure that the turbine wheel can move relative to the clutch housing without contact.

The utility model discloses an excitation control method based on nonlinear robust power system stabilizer, which belongs to the technical field of power system stability control. The utility model is characterized in that a nonlinear robust power system stabilizer is put forth on the basis of multi-machine excitation system nonlinear mathematical model and by combining differential geometry control theory and nonlinear HíÌ method. The output signals of the nonlinear robust power system stabilizer are superimposed with the output signals of an original automatic voltage regulator to generate excited control signals, which are used to control the excitation system of the generating set, thus preventing the influence of external uncertainties, solving the problems of dynamic nonlinearity and high coupling in power system, overcoming the defects of neglecting the nonlinearity inherent in the system in prior art, improving the dynamic stability and expanding the installed capacity of the generating set to the maximum extent.

A piston for an air spring of a heavy-duty vehicle includes a sidewall and a central hub. The sidewall and the central hub are attached to a first bottom plate of the piston. A top plate is removeably attached to a top portion of the sidewall and a top portion of the central hub. A bottom portion of said central hub includes a second bottom plate that is recessed relative to the first bottom plate for attachment to a piston mounting pedestal that is in turn mounted to a beam of a suspension assembly of the heavy-duty vehicle.

In sealing elements (3, 3′, 3″) made of synthetic material (14) having embedded fiber reinforcement (11), as it has been used for some time for automatic compressor valves, the fiber reinforcement (11) consists of at least one piece of an essentially flat, non-woven fiber fabric (12), which has, at least in its plane, a directionally independent (random) fiber orientation. Disadvantages of short-fibered reinforced synthetic materials can thereby be avoided, as well as the ones for synthetic materials reinforced by means of long-fibered fabrics, and sealing elements (3, 3′, 3″) may be obtained thereby having a very high durability.

The invention relates to an active flexible control method for a hydraulic drive unit of a foot-type robot. A method for reducing the displacement of a valve core of a servo valve is adopted, so as to reduce the output flow and furthermore the damp control effect is achieved. A method of combining rigidity feedback control and load feedforward control is adopted to achieve high-precision rigidity control of the hydraulic drive unit; the damp control of the hydraulic drive unit is combined with the high-precision rigidity control of the hydraulic drive unit to achieve active flexible control of the hydraulic drive unit of the foot-type robot. The method has the following advantages that the active flexible control can be achieved by the control method, the adverse effect on the robot foot-state control due to the instantaneous stall of the hydraulic drive unit of each joint hydraulic drive unit caused by instantaneous power loss of the foot can be avoided and the high-precision rigidity control can be achieved under different load conditions.

A magneto-rheological damper comprises a cylinder barrel, a left end cap, a piston rod, a piston, a right end cap, a connecting barrel, a winding barrel, a coil, an external guide magnet and a cap nut. The magneto-rheological damper has the advantages that the coil slides on the cylinder barrel in the direction identical with motion direction of the piston rod, so that a magnetic core on the piston and the external guide magnet are always guaranteed to form a closed magnetic loop, flow guiding can be functioned by an axial central hole and a radial hole in the piston, and magneto-rheological fluid viscosity can be changed by changing the size of the holes during working of the damper, and further, high-viscosity damping force can be generated. The coil is arranged outside the cylinder barrel, convenient for winding, convenient to maintain and check and good in sealing performance. By directly inflating the damper, extra purchasing an energy storage device is omitted, and the magneto-rheological damper has high applicability. Since the magneto-rheological damper is good in damping property, the magneto-rheological damper can be mounted on mechanical structures required to be damped, such as suspension damping of automobiles, damping of undercarriages of planes, damping of seats and bridges.

The invention discloses an ultrahigh strength self-compaction bare concrete for a wind turbine generator tower. The ultrahigh strength self-compaction bare concrete is prepared from the following components: 650-680kg / m3 binding material, 640-680kg / m3 machine-made sand, 980-1020kg / m3 macadam, 7-11kg / m3 water reducer, 6-10kg / m3 enhancing compacting agent, 1-2kg / m3 cellulosic fiber and 115-130kg / m3 water, wherein the binding material contains the following components by dosage per stere (kg / m3): 390-408kg / m3 cement, 35-37kg / m3 micro-bead, 142-149kg / m3 mineral powder, 35-37kg / m3 coal ash and 48-49kg / m3 silica fume. The ultrahigh strength self-compaction bare concrete for the wind turbine generator tower has the advantage that the concrete with strength grade within the scope of C100-C120, self-compaction, pumpability, excellent hook surface crack resistance and fatigue resistance property can be prepared.

A composition for damping mechanical motions, such as for damping of mechanical impacts or oscillations can include at least one collagen as well as at least one carrier matrix for the at least one collagen. The carrier matrix contains a formable material. The composition also can include at least one liquid having or containing polar molecules. The carrier matrix, the at least one collagen and the liquid form a mixture (or batch). A method for manufacturing a material for use in damping mechanism motions includes preparing an essentially non-cross-linked, liquid elastomer parent substance as well as providing a liquid collagen parent substance that contains at least one collagen and at least one liquid with polar molecules. The method also includes generating a mixture from the elastomer parent substance and the collagen parent substance as well as cross-linking molecules of the elastomer parent substance in the generated mixture.

The invention discloses a shape memory alloy sealing gasket. The sealing gasket is characterized in that the material comprises the following components in parts by weight: 53.25-58.42 parts of Ni, 41.63-45.82 parts of Ti, 0.1-0.2 part of Al, 0.01-0.03 part of Cu and 0.015-0.12 part of V. The shape memory alloy sealing gasket utilizes the superelasticity and shake-suction performance of the NiTi alloy and has the advantages of good compression elasticity, corrosion resistance, fatigue resistance, high pressure resistance and good safe reliability.

The invention discloses an elastic support foil hydrodynamic gas bearing with inherent structure pre-wedge space. The elastic support foil hydrodynamic gas bearing comprises a bearing body and a rotary shaft located in the bearing body. An elastic support element is arranged on the inner side of the bearing body. Top-layer flat foil is arranged between the elastic support element and the rotary shaft. A smooth shaft segment is arranged on the axial middle area of the surface of the rotary shaft. The positions, located on the two sides of the smooth shaft segment, of the surface of the rotary shaft are each provided with a line of inclined grooves. The inner side of the top-layer flat foil surrounds and wraps the rotary shaft, a pre-clearance is formed between the top-layer flat foil and the rotary shaft, meanwhile, the elastic support element and one end of the top-layer flat foil are fixed to the same position of the bearing body, and the other end of the top-layer flat foil is free.The elastic support foil hydrodynamic gas bearing has the beneficial effects that a hydrodynamic gas film can be formed at the relatively-low rotating speed with small foil deformation, the rotary shaft and the bearing body are in contact uniformly in the start stage and the stop stage, the contact friction time between the rotary shaft and the bearing body is shortened, wear between the rotary shaft and the bearing body is reduced, and the operation stability and reliability of a system are improved.

The invention provides an intelligent controllable bearing and a method for controlling rotor vibration. The bearing comprises an excitation system, a bearing block, a bearing shell, a bearing bush and a floating ring. Magnetorheological fluid is adopted as a lubricating agent. After the magnetorheological fluid is supplied, the shaft neck and the inner surface of the floating ring form a lubricating oil film, namely, an inner oil film, and the outer surface of the floating ring and the bearing bush form a lubricating oil film, namely, an outer oil film. The property of the magnetorheological fluid is changed by the magnetic field generated by the excitation system, the property of the lubricating oil films is further changed, and intelligent behaviors of the bearing are achieved. The floating ring rotates at the speed lower than that of a rotary shaft. By means of the external magnetic field, stiffness and damping characteristics of the bearing are changed, so that vibration control of a rotor is achieved. The method is suitable for rotor occasions sensitive to vibration, and semi-active control over a rotor system can be easily achieved.

The invention discloses an epoxide resin based piezoelectricity damping composite material and a preparation method thereof. The composite material consists of piezoelectric ceramics, graphitized carbon black and epoxide resins, wherein the components are integrated into one whole body by the secondary casting; the introduced piezoelectric ceramics is centralized on the upper part and the lower part of the composite material respectively, naturally settled in the process of forming and finally forms a sandwich structure with graded distribution. The invention utilizes the secondary casting forming process to prepare the epoxide resin based piezoelectricity damping composite material with the gradient sandwich structure, on the basis of realizing the piezoelectricity damping by the three-phase cooperation effect, the composite material also has the advantages of the sandwich structure, thereby greatly improving the damping performance of the composite material; through the dynamic mechanical analysis of a sample, the max. damping factor (tan delta max) is increased by more than 20 percent, the damping temperature zone delta T (the temperature zone where tan delta is more than 0.3)) is increased by more than 33 percent, and the area TA included under the tan delta-T curve is increased by more than 19 percent.

The embedded metal rubber compound damping material and the forming method relate to the metal compound damping material. It solves the problem of the no continuous material room, rough surface, no ideal part character, not bear collecting load, not proper for the tension, the shear and the torsion. The connecting part of the metal rubber material is embedded into the continuous material which is fixed with the rubber material. The forming method is: one, preparing the metal rubber material; two, the formed metal rubber material is embedded into the die; three, pouring the liquid metal or the resin into the die. After the liquid metal or the resin solidifying, it is separated from the die and gets the metal rubber compound damping material. The compound material avoids the reliability to the holding structure and decreases the process and cost which has the good damping ability under the out bearing.

An elevator system includes a roller (16) having a hardness that varies responsive to a magnetic field (20). The roller (16) rolls along a guide rail (28) to maintain a desired orientation of the elevator car (12). In one example, the roller (16) includes a membrane (30) defining a generally annular chamber (36) containing fluid (22) that changes viscosity responsive to changes in the magnetic field (20). The rollers (16) are associated with at least one magnetic field generator (18) that generates a magnetic field (20) of a selected strength. Varying the magnetic field varies the hardness of each roller (16) to control vibrations of the elevator car (12) to improve ride quality.

A turbine bucket is provided that can make centrifugal stress acting on a blade or dovetail not greater than a limit value of a material and that is provided with a shape of a blade root that can ensure a steam passage even if the blade is increased in length in order to increase an exhaust area.The turbine bucket is for a steam turbine low-pressure final stage and has an exhaust area exceeding 9.6 m2 (13.8 m2) in steam-turbine final-stage buckets for a rated speed 3600 rpm (3000 rpm) machine. The turbine bucket is made of martensite steel. A blade portion of the turbine bucket has a suction surface 7 and a pressure surface 8 which are each formed, at a turbine blade root, of three areas consisting of a steam inlet side area 12 with curvature, a steam outlet side area 13 with curvature and an approximately straightly formed area put between the two areas. An airfoil of the turbine bucket root is formed such that the relationship between a blade pitch t and a turbine-axial width BW of the blade portion is BW / t≧5.

An anti-knock device of large distortion and heavy load visco-elasticity damper is composed by a large distortion visco-elasticity damper and lead compacting damper. The large distortion visco-elasticity damper is put in the middle and surrounded by several lead compacting dampers with the top and bottom linked to the armor plate to from an integrated damper.

A manually guided implement, such as a power saw, a cut-off machine, or the like, having a drive motor for driving a tool of the implement. The drive motor has a drive shaft that is rotatably driven about an axis of rotation. The implement has a handle on which is disposed at least one control handle for the drive motor. Formed between the handle and the drive motor is a vibration space that is spanned by at least one anti-vibration element, at least one of which includes a coil spring, the longitudinal axis of which is disposed approximately perpendicular to a longitudinal plane of the implement. The vibration space is spanned by at least one connecting element, the longitudinal axis of which is inclined relative to a transverse plane of the implement that is disposed perpendicular to the longitudinal plane.

The invention discloses a turning gradient control valve, which is designed to provide a two-functional turning gradient control valve which can absorb vibration of the system, has low noise and energy saving, and can be applied to a static signal type and a dynamic signal type, wherein a first hole (P) in communication with a first throttle groove (4a1) and a second throttle groove (4a2) of a second hole (CF) is arranged on a beading at the right side along the circumference direction; the first hole (P) is in communication with a third throttle groove (4b1) and a fourth throttle groove (4b2) of a third hole (EF), wherein the first throttle groove (4a1) and the second throttle groove (4a2) are matched with a throttle side (5a) of a first sunken cutting groove of a valve body (5a) to form a valve port through which the first hole (P) is led to the second hole (CF); the third throttle groove (4b1) and the fourth throttle groove (4b2) are matched with a throttle side (5b) of a second sunken cutting groove of the valve body (5) to form a valve port through which the first hole (P) is led to the third hole (EF); the left end of the valve core (4) is provided with an asymmetric composite damper (3) while the right end of the valve core (4) is provided with a first damping hole (6).