62results about How to "Reduce dynamic stiffness" patented technology

The invention discloses a quasi-zero stiffness vibration isolator with positive and negative stiffness in parallel connection. The vibration isolator comprises a base, an upper cover, a supporting rod, spiral springs, spacers, an annular iron core, fan-shaped permanent magnet bodies, stators, a permanent magnet body clamping mechanism, working air gaps and a guide plate. The fan-shaped permanent magnet bodies, stators, permanent magnet body clamping mechanism, and working air gaps form a magnetic flow loop, and form magnetic springs with negative magnetic stiffness. The spiral springs are connected with the supporting rod and the upper cover, and initial positive stiffness of the vibration isolator is provided and is in parallel connection with magnetic negative stiffness. The dynamic stiffness of the annular iron core in the equilibrium position is reduced. The guide plate is mounted on the lower portion of the base, and is in sliding-fit with the supporting rod. Compared with an existing quasi-zero stiffness vibration isolator, the vibration isolator has the advantages that load bearing is high, and the mechanism is compact; and as a passive vibration isolator, the vibration isolator can effectively reduce the natural frequency of the vibration isolation system, broaden a vibration isolation frequency band, and has the advantages of easy maintenance and high reliability.

The invention provides a high-frequency decoupling piston magneto-rheological damper, relating to a damper and solving the problem of poor vibration isolation performance in high frequency caused by great dynamic rigidity of the magneto-rheological damper in high frequency. The high-frequency decoupling piston magneto-rheological damper comprises a cylinder barrel, a first end cover, a piston, a piston rod, a coil, magneto-rheological fluid and a decoupling mechanism, wherein, the decoupling mechanism comprises a first limit baffle, a second limit baffle, a first compression spring and a second compression spring. In high-frequency micro amplitude, the piston rod vibrates in high frequency and micro amplitude, the piston does not move, the piston rod and the piston perform micro relative movement between two limit baffles and no damping exists between the piston rod and the piston; and in low-frequency great amplitude, the piston rod vibrates drastically in low frequency, and the limit baffle pushes the piston to generate great damping. The invention can dramatically lower the high-frequency dynamic rigidity and damping, basically keeps the great damping characteristic of a common magneto-rheological damper, and can be used in the field of isolation vibration.

The invention belongs to the field of vibration and noise control, and relates to a three-dimensional vibration isolation device combining an inerter and a rubber support. The three-dimensional vibration isolation device combining the inerter and the rubber support comprises a spiral spring, a rotary shaft, a rotary disc, rotary disc constraint parts, coils, neodymium magnets, damping liquid, damping rods, an upper sleeve, a lower sleeve, a Teflon sleeve, laminated rubber, a lead core, a rubber protective sleeve, an upper connecting plate, a lower connecting plate, a rubber support upper protection plate and a rubber support lower protection plate. According to the three-dimensional vibration isolation device combining the inerter and the rubber support, three-dimensional vibration isolation is achieved by connecting an inerter vibration isolation system and the rubber support in a decoupling mode; and effective vertical vibration isolation can be achieved by connecting the spiral spring and the inerter system in parallel, horizontal vibration isolation can be achieved by the rubber support, and a decoupling system is arranged, so that horizontal vibration isolation and vertical vibration isolation function respectively to achieve three-dimensional vibration isolation. The three-dimensional vibration isolation device combining the inerter and the rubber support is widely applicable to buildings built over a subway and important instruments and equipment with three-dimensional vibration isolation requirements, and the three-dimensional vibration isolation effect is better than that of an existing steel spring vibration isolator.

The present invention discloses an ultralow-frequency hydraulic-pressure vibration isolation device based on shape memory alloy springs. The vibration isolation device is mainly composed of a fuel tank, a rubber holder, mobile side plates, a piston, a piston rod, an installation table board, a guide sleeve, common springs, the shape memory alloy springs, a seal ring and the like. According to the ultralow-frequency hydraulic-pressure vibration isolation device provided by the present invention, the shape memory alloy springs serve as elastic elements, and through pre-treatment of a shape memory alloy, the shape memory alloy springs can work within a hyperelastic working range. Within the hyperelastic working range, large deformations of the shape memory alloy springs only cause slight restoring forces, and thus the shape memory alloy springs can obtain an ultralow dynamic stiffness. With arrangement of a differential-type hydraulic device using the shape memory alloy springs as the elastic elements, ultralow-frequency vibrations can be effectively isolated.

The invention relates to a semi-active particle damping rubber suspension device for a power assembly. According to the technical scheme of the semi-active particle damping rubber suspension device for the power assembly, the middle of a rubber spring (3) is coaxially embedded in a connecting framework (2), and the open end of the rubber spring (3) is fixedly connected with the open end of a suspension shell (5) in a face-to-face mode through a steel ring (4). The upper end face and the lower end face of an outer steel pipe (11) are coaxially connected with the lower plane of the connecting framework (2) and the upper plane of a base plate (10) correspondingly, the upper end face and the lower end face of an inner steel pipe (12) are coaxially connected with the lower plane of the connecting framework (2) and the upper plane of the base plate (10) correspondingly, steel balls (14) are contained in a damping cavity (15), and the volume of the steel balls (14) is 50%-80% of the volume of the damping cavity (15). An electromagnetic coil (13) is installed on the outer wall of the outer steel pipe (11) and is located on the upper plane of the base plate (10), the electromagnetic coil (13) is externally connected with a controller of a suspension assembly through a coil socket (6) which is fixed to the suspension shell (5), and the coil socket (6) is fixed to the suspension shell (5). The semi-active particle damping rubber suspension device for the power assembly has the advantages of being simple and reliable in structure, convenient to manufacture and low in cost, and the wideband vibration isolation performance, the vibration reduction performance and the noise reduction performance are achieved.

The invention discloses a compressor foot pad and a refrigerator. The compressor foot pad comprises a base body, a buffering part, a supporting part and an installation part connected with a compressor, wherein the base body, the buffering part and the supporting part are integrally arranged. The base body is cylindrical, a buffing hole penetrating through the base body is formed in the axial direction of the base body, and the aperture of the middle of the buffering hole is larger than that of the two ends. The installation part, the buffering part and the supporting part are formed on the side wall of the base body in the axial direction of the base body, a gap is formed between the installation part and the buffering part, and a gap is formed between the buffering part and the supporting part. According to the compressor foot pad, due to the fact that the installation part, the buffering part and the supporting part are arranged in the length direction of the base body in a spaced mode, the compressor foot pad is arranged to be of a multilayer structure, the compressor foot pad can deform easily when subjected to pressure in the length direction of the base body, so that the movable rigidity of the compressor foot pad is reduced, more kinetic energy can be absorbed, and thus a good buffering effect is achieved.

The invention discloses a stepless adjusting quasi zero rigidity center hanging device. The stepless adjusting quasi zero rigidity center hanging device comprises vertical springs, transverse springs, a hydraulic shock absorber, a vertical displacement sensor, a control device and a hydraulic executer. A bogie comprises a U-shaped side beam. A vehicle body connecting piece connected with the tops of the vertical springs and the hydraulic shock absorber is arranged at the bottom of a vehicle body. Spring connecting bases are arranged on the two side walls of the U-shaped side beam correspondingly. The transverse springs are connected between the spring connecting bases and the vehicle body connecting piece correspondingly. A telescopic rod of the hydraulic executer vertically points at the lower portion and is connected with the spring connecting bases. The vertical displacement sensor is arranged on the vehicle body connecting piece. By means of the above manner and the stepless adjusting quasi zero rigidity center hanging device, low-frequency vibration isolating and reducing performance is improved, the vibration isolating and damping frequency range is enlarged, meanwhile, it is guaranteed that a vehicle has good low-frequency vibration isolating and reducing performance under different loads, and the comfort degree of the vehicle is improved.

The invention provides a partial-zero-stiffness vibration isolator. By means of arrangement of a negative stiffness structure, according to the principle that positive stiffness and negative stiffnesscounteract, the stiffness, at the balance position, of the system approaches to zero, so that the inherent frequency of the system is greatly lowered; and in this way, the vibration isolation capacity is improved, low-frequency vibration isolation and ultra-low-frequency vibration isolation are achieved. The partial-zero-stiffness vibration isolator can bear large weight and can effectively lowerthe dynamic stiffness of the system, the inherent frequency of the whole system approaches to zero too, and therefore the partial-zero-stiffness vibration isolator is quite suitable for low-frequencyvibration isolation and even ultra-low-frequency vibration isolation. Compared with other vibration isolators, a cross arm structure, T-shaped sliding plates and guide rails can guarantee that extension and retraction of an extension spring are on the same horizontal line, so that the stability of a negative stiffness mechanism is guaranteed, and the unstable phenomenon existing when a main spring is compressed is avoided. The negative stiffness structure can be adjusted through fine movement of the T-shaped sliding plate on the guide rail, and meanwhile the height of the lower end face of the main spring can be adjusted in the vertical direction so as to be adapted to objects of different masses.

The invention provides a longitudinal loading device with low dynamic stiffness characteristic for a rotor shaft system. The device comprises a servo rotation module, a loading disc, a main spring, an auxiliary spring, a loading screw rod, an electromagnetic suction module, an excitation rod, an electromagnetic vibration exciter and a fixing support, wherein one end of the loading screw rod is fixed on a front panel of the fixing support, and the other end of the loading screw rod runs through the loading disc; the main spring is arranged on the loading screw rod between the fixing support and the loading disc in a sleeving manner; the auxiliary spring is arranged at the tail end of the loading screw rod in a sleeving manner, and is matched with a bolt to compress the loading screw rod and the loading disc; the servo rotation module is arranged at the front end of the loading disc, and is connected with the rotor shaft system; the electromagnetic suction module is arranged on the front panel of the fixing support, and the electromagnetic exciter is rigidly fixed or flexibly suspended on the fixing support; the excitation rod runs through an opening in the front panel of the fixing support and an intermediate hole of the electromagnetic suction module to be fixed at the center of the rear end face of the loading disc. The device can avoid the influence on the longitudinal coherent characteristics of the rotor shaft system caused by a longitudinal loading device.

The invention relates to the field of vehicles and discloses an air spring assembly comprising a shell, a piston rod and an upper suspension. One end of the piston rod penetrates through the shell andis connected to the upper suspension. The piston rod is sleeved with a seal assembly. The seal assembly is clamped between the upper suspension and the outer wall of the shell, so that the upper suspension does not make contact with compressed air in the shell throughout in the axial moving process of the piston rod. An installation cavity is formed in the outer wall of the shell in a concave mode. The upper suspension and the seal assembly are both arranged in the installation cavity. According to the air spring assembly, the upper suspension is arranged outside the shell, the upper suspension does not make contact with the compressed air in the shell throughout in the axial moving process of the piston rod through the seal assembly, durability of the upper suspension can be ensured, anddynamic stiffness and static stiffness of the upper suspension can also be lowered to a certain extent. In addition, the upper suspension and the seal assembly are both arranged in the installation cavity formed in the outer wall of the shell in the concave mode, and the occupied space of the air spring assembly is lowered as far as possible.

The invention discloses a device for measuring the dynamic stiffness of a griffe support connecting system of a heald griffe. The device comprises two griffe supports connected to the two ends of the heald griffe, the griffe supports are fastened to the heald griffe through two sets of bolts, the number of the bolts is six, one end of each pull rod is connected to the upper portion of the corresponding griffe support through a bolt and a nut, six testing shafts are connected to the side, with the six bolt holes of the griffe supports, of the heald griffe, the testing shafts are connected with sensors respectively, and the sensors are connected to a signal analyzer through a load amplifier and transmitters. The device further comprises a force hammer, a force sensor is installed on the force hammer, the signal analyzer is connected to the force hammer, the force sensor is connected to the signal analyzer through a charge amplifier, and the signal analyzer is connected with a display screen. A tilt angle sensor, a displacement sensor and an acceleration sensor are used for measuring the responses of the connecting parts of the heald griffe and the griffe supports, and thus the dynamic stiffness and the dynamic damp of the heald griffe connecting system can be obtained.

The invention provides a repulsive force type magnetic force negative stiffness honeycomb structure. The structure comprises an upper structure and a lower structure, the upper structure and the lowerstructure are in a mirror image, magnetisms of magnets of the upper structure and the lower structure are arranged in the opposite direction, the upper structure and the lower structure are connectedthrough a support, the upper structure is formed by multiple single-cell structures which are connected, and each single-cell structure comprises a wall plate, joints, a first transmission rod, a second transmission rod, a first bending beam, a second bending beam and a permanent magnet plate. The wall plates are connected with the first bending beams through the first transmission rods, the first bending beams and the second bending beams are arranged in a mirror image, the joints are arranged at the two ends of the first bending beams and the two ends of the second bending beams, the secondtransmission rod is arranged at the shortest distance position of each first bending beam and the corresponding second bending beam, and the permanent magnet plates are arranged on the connecting lines of the vertical middle positions of the second transmission rods and the joints. Through positive and negative stiffness combination, high static stiffness and low dynamic stiffness can be obtained, the vibration isolation interval can be expanded, and the contradiction between the static displacement and the vibration isolation effect can be solved.

An air spring in an automobile suspension system is critical to improving the smoothness and the comfort of a vehicle, protecting a road and goods, and restricting overload. In a passive air suspension system which is commonly used in the prior art, because the matching between the static rigidity of the air spring and the whole vehicle is not reasonable and individuation regulation cannot be carried out, the side swinging phenomenon of the vehicle in running is quite serious, so that a passenger and a driver are dizzy and uncomfortable, and the comfort of the passenger and the safe driving of the driver are badly affected. The invention relates to a composite air spring which is occupied by an inner volume of an airbag and is impact-reduced by an auxiliary air chamber specially developed to solve the difficult problem. The air spring regulates the static rigidity through the volume, and solves the difficult problem that the rigidity of the air spring which is selected according to a standard is not matched with an actual requirement and cannot be regulated. The air spring regulates the dynamic rigidity through the auxiliary air chamber, can automatically reduce the dynamic rigidity when the vehicle runs and encounters a bulge on a road surface, so that the impact of the bulge on the vehicle body is reduced, and the comfort of the vehicle can be improved.

The invention relates to a hydraulic suspension, which comprises a main spring, a flow passage, a platen, a metal skeleton, a bottom film, a decoupling membrane, an upper hydraulic chamber and a lower hydraulic chamber, wherein a plurality of through holes are formed in the places, which are opposite to the decoupling membrane, of the platen; a plurality of openings are formed in the places, which are opposite to the decoupling membrane, of the flow passage; a connecting line between the center of each opening and the center of through hole opposite to the opening is perpendicular to the decoupling membrane; the decoupling membrane is provided with bulges which outwards extend from the upper surface and the lower surface at the same time; the bugles are not opposite to the through holes. The through holes in the platen and in the flow passage are enabled to form a net structure; meanwhile, the bulges are added on the decoupling membrane to fix the decoupling membrane; the decoupling membrane can be effectively prevented from a large deformation quantity when being strongly impacted; the reliability problem of the decoupling membrane is solved.

The present disclosure relates to a grinding machine. More particularly, the present disclosure relates to a centerless grinding machine comprising a damping device. The present disclosure also relates to a spindle for a grinding machine, and to a damping device for a spindle of a grinding machine, particularly for a grinding spindle or regulator spindle of a centerless grinding machine, wherein the damping device comprises at least one damping unit including an auxiliary mass section, an elastic section and a damping section, which are integrated in the spindle, and which jointly define a damped vibratory system for increasing the dynamic stiffness of the spindle.

The invention discloses a power assembly suspension bushing which comprises an inner sleeve, an anti-rotating pin, an outer sleeve, a rubber main spring and a plurality of vibration isolation blocks arranged on the rubber main spring, and the inner sleeve and the outer sleeve are sequentially and coaxially arranged from inside to outside. The rubber main spring is arranged between the inner sleeve and the outer sleeve, and the inner sleeve and the outer sleeve are connected together through partial vulcanization of the rubber main spring. An anti-rotating pin mounting hole is formed in the inner sleeve. The anti-rotating pin is pressed into the anti-rotating pin mounting hole through interference fit. The plurality of vibration isolation blocks are asymmetrically distributed on the rubber main spring, and the shapes of the vibration isolation blocks are different. The power assembly suspension bush has low dynamic stiffness at the high-frequency band of 600Hz-3000Hz, is suitable for pure electric vehicles, has an anti-rotation function, and is simple in structure, low in cost and easy to produce.

The invention discloses a composite support plate device between a double-layer hull board with high-silence-low-motion stiffness. The composite support plate device between the double-layer hull board with high-silence-low-motion stiffness comprises a pressure cylinder between the double-layer hull board, an outer side support plate, an inner side support plate and an adhesive elastic damping material, wherein a piston panel is arranged in the pressure cylinder, and the piston panel is in gap coordination with the inner wall of the pressure cylinder; the upper part of the outer side support plate is fixedly connected to a light surrounding shell, and the lower part of the outer side support plate extends into the pressure cylinder and is fixedly connected to the piston panel; the lower part of the inner side plate is fixedly connected to a pressure resistant hull, and the upper part of the inner side plate is fixedly connected to the bottom of the pressure cylinder; the adhesive elastic damping material is sealed in the pressure cylinder, and the upper surface and the lower surface of the adhesive elastic damping material are vulcanized with board pieces in contact with the upper surface and the lower surface of the adhesive elastic damping material into an entirety. According to the composite support plate device between the double-layer hull board with high-silence-low-motion stiffness, the working stiffness is low when in normal load, the limiting stiffness is high when big load and big deformation occur, the structure is simple, the use and the maintenance are convenient, and the damping effect is remarkable. The invention further discloses a modeling method of the composite support plate device between the double-layer hull board with high-silence-low-motion stiffness.

The invention discloses a nonlinear stiffness vibration-isolation platform for optoelectronic equipment, and relates to the technical field of vibration-isolation buffering of the photovoltaic equipment. The vibration-isolation platform is composed of an upper panel, a lower panel, a nonlinear stiffness assembly, an auxiliary stiffness assembly and a vertical guiding assembly; the upper surface ofthe upper panel is fixedly connected with the photovoltaic equipment subjected to vibration isolation, and the lower surface of the lower panel is fixedly connected with a moving carrying platform; the nonlinear stiffness assembly serves as a main force bearing part of the vibration-isolation platform to convert vertical motion into horizontal motion and provide linear restoring force; the auxiliary stiffness assembly achieves the effect of auxiliary support on the load and is used for increasing the bearing capability of the vibration-isolation platform; and the vertical guiding assembly isused for constraining motion loaded by the upper panel and the vibration-isolation platform. Thus the nonlinear stiffness vibration-isolation platform has very low dynamic stiffness while having the large bearing capability, accordingly, the inherent frequency of a system can be decreased significantly, and the very good low-frequency vibration-isolation effect is achieved; and the nonlinear stiffness vibration-isolation platform is suitable for vibration-isolation buffering application of the large-scale photoelectric equipment.

The invention provides a variable cross section plate spring assembly. The variable cross section plate spring assembly comprises a plate spring set. The plate spring set is formed in a manner that a plurality of single plate springs are assembled together through a certain prestress by means of a center bolt or a U-shaped bolt, the end portions of the single plate springs are additionally provided with damping rubber blocks, that is, the end portion of each plate spring is additionally provided with one elastic rubber block in a manner of through hole positioning, vulcanizing, cementing and the like, meanwhile, the end portions of the single plate springs are subjected to bending treatment, good attaching between the elastic rubber blocks and the plate spring end portion planes is guaranteed, the stress distribution among the springs is improved, the reliability of the plate spring assembly is improved, the appearance structure is simple, the installation manner of the variable cross section plate spring assembly and the installation manner of a current traditional plate spring are the same, and direct replacing can be achieved.

The invention relates to the technical field of compressors, in particular to a compressor leg convenient to install. The compressor leg convenient to install comprises a fixing base and a compressorshell. A supporting plate is movably installed at the upper portion of the fixing base, a supporting column is fixedly installed in the middle of the upper side of the supporting plate, an installinghole is formed in the edge of the bottom of the compressor shell, a first spring is arranged between the portion, close to the fixing base, of the supporting column and the compressor shell in a sleeving mode, two corresponding elastic sheets are arranged at the upper portion of the side wall of the supporting column, and are arranged in two limiting grooves respectively, a connecting hole is formed in the portion, close to the center of the inner sides of the two elastic sheets, of the supporting column, limiting rods are inserted into the two ends of the connecting hole, and second springs are arranged between the portions, close to the supporting column, of the limiting rods and the elastic sheets in a sleeving mode. The compressor leg convenient to install is simple in structure and convenient to install, the stability of a compressor can be effectively improved, and the poor consequence of vibration can also be effectively eliminated or relieved.

The invention provides a rubber compound with a low dynamic/static stiffness ratio, a preparation method thereof, and a mounting structure. The rubber compound with the low dynamic/static stiffness ratio comprises, by weight, 50-95 parts of natural rubber, 5-50 parts of cis-polybutadiene rubber, 3-10 parts of zinc oxide, 0.5-5 parts of 2-ethyl zincate, 1-5 parts of a chemical anti-aging agent, 1-5parts of a physical anti-aging agent, 30-50 parts of carbon black, 0.5-5 parts of a coupling agent, 0-10 parts of a plasticizer, 0.5-3 parts of sulfur and 1-6 parts of a promoter. The natural rubberand cis-polybutadiene rubber are used together, and the components such as 2-ethyl zincate and the coupling agent are also used, so that the prepared rubber compound has a good static stiffness and alow dynamic stiffness, thereby the rubber compound with the low dynamic/static stiffness ratio is obtained.