25results about How to "Lower resonance frequency" patented technology

The invention relates to a composite sensor for acceleration and pressure monitoring and a working method thereof, and belongs to the field of sensors, the composite sensor comprises an upper shell, a middle shell and a lower shell, the upper end of the upper shell is provided with an M6 mounting thread, the lower end of the upper shell is a hexagonal base, and a groove space is reserved in the inner side of the lower end of the hexagonal base; the appearance of the middle shell is a hexagonal base, and M5 mouthpiece installation holes are formed in the left side and the right side of the middle shell. A double-end beam sheet is arranged in the middle of the inner side of the middle shell and is of a sheet-shaped structure, and the two ends of the double-end beam sheet are fixedly connected with the front inner wall and the rear inner wall of the middle shell or integrally formed. The center of the double-end beam sheet is provided with an integrally connected cylindrical screw rod, and the cylindrical screw rod is provided with an acceleration sensor core body structure; the appearance of the lower shell is a hexagonal base, and a mounting groove is formed in the bottom of the lower shell and used for mounting a pressure sensor core structure; the upper shell, the middle shell and the lower shell are connected in a welded mode. The device is simple in structure, can realize synchronous monitoring of acceleration and pressure without mutual interference, and can realize multi-scene application at the same time.

The present invention proposes a debugging method for a constant quasi-zero stiffness vibration isolation structure with double pairs of diagonal rod negative stiffness, and the steps are as follows: build a constant quasi-zero stiffness vibration isolation structure including a first pair of diagonal rod assemblies and a second pair of diagonal rod assemblies, and the double pairs of diagonal rod negative stiffness mechanisms are symmetrically arranged on both sides of the positive stiffness mechanism; determine that the pre-compression amount of the horizontal springs in the first pair of diagonal rod assemblies and the second pair of diagonal rod assemblies in the initial state is equal to the horizontal projection length of the diagonal rods; respectively determine the stiffness of the horizontal springs in the first pair of diagonal rod assemblies and the second pair of diagonal rod assemblies and the vertical springs of the positive stiffness mechanism, and construct dimensionless parameters to meet the conditions; when having a constant stiffness characteristic, calculate the stiffness, and calculate the starting vibration isolation frequency according to the relationship between the vibration isolation mass, and if the starting vibration isolation frequency does not meet the design requirements, reconstruct the dimensionless parameters. The present invention can obtain a zero stiffness characteristic that is a straight line near the static equilibrium point, and can obtain a wider range of constant quasi-zero stiffness characteristics.

The utility model relates to the technical field of generator set damping, and discloses a generator set damping device which comprises a device body, the device body comprises a device base and a connecting base plate, a damping assembly is connected between the device base and the connecting base plate, and the damping assembly comprises an external sleeve piece. A mounting groove body is formed in the top end of the external sleeve piece, a damping column is mounted in the mounting groove body, the top end of the damping column is fixedly connected with the bottom end of the connecting base plate, the damping column is composed of a damping spring, a damper support and a damper, and a vibration isolation foot body is mounted at the bottom end of the device base. The vibration isolation foot body is a rubber vibration isolation gasket. Through the arrangement of the device base, the connecting base plate and the damping assembly, vibration generated by the generator set can be absorbed and eliminated, the damping assembly can effectively reduce the resonance frequency of the generator set, and the overall stability and the vibration control effect are improved.

The utility model discloses a high-strength support loudspeaker, which comprises a support part and at least two sound production parts arranged in the support part, the supporting part comprises a magnetic cover, a supporting polar plate, a bracket and a vibrating diaphragm, the bracket is wound on the outer side of the magnetic cover and erected above the supporting polar plate, and the vibrating diaphragm is arranged above the bracket; the sound production part comprises a magnetic group and a voice coil, the magnetic group is arranged between the magnetic cover and the supporting polar plate, and the voice coil is wound in the magnetic group and connected with the vibrating diaphragm. According to the utility model, through the structure of the support pole plate, an original large-span support system is changed into two or more small-span systems, the overall strength of the loudspeaker is improved, and a series of problems caused by support deformation during assembly or later use are prevented.

The invention relates to a high-speed rail joist supporting structure, and relates to the technical field of supporting structures. The device comprises a pier, a supporting beam and a plurality of supporting seats, the pier is vertically arranged, the supporting beam is horizontally arranged and fixed to the top of the pier, the supporting seats are arranged on the supporting beam and distributed at intervals in the length direction of the supporting beam, the top ends of the supporting seats are connected with a high-speed railway bridge, and buffering assemblies are arranged on the supporting seats. The joist supporting structure has the effect that the supporting stability of the joist supporting structure cannot be affected when the high-speed rail bridge is vibrated.

The present invention discloses an acoustic device, comprising a first closed cavity and a second closed cavity, wherein the spacer can be at least partially flexibly deformed, the first closed cavity is adjacent to the vibrating diaphragm, and the second closed cavity is far away from the vibrating diaphragm; when the vibrating diaphragm vibrates, the internal sound pressure of the first closed cavity changes, and the flexible deformation part of the spacer is deformed as the sound pressure in the first closed cavity changes, and the volume size of the first closed cavity is flexibly adjusted; the second closed cavity confines the sound waves generated by the flexible deformation part when deformed in the second closed cavity; the Young's modulus or strength of at least a local area of ​​the flexible deformation part is less than the cavity wall of the first closed cavity and / or the cavity wall of the second closed cavity, and the Young's modulus of all or a local area of ​​the flexible deformation part is less than or equal to 8000Mpa. The acoustic device in the present invention can effectively reduce the resonant frequency and significantly improve the low-frequency sensitivity of the product as a whole.

The invention discloses a pre-pressing type ultrathin matrix spring vibration isolation support and a mounting method thereof. The support comprises an upper seat plate, a lower seat plate, a vibration reduction assembly, a pre-pressing assembly and a horizontal buffering and limiting assembly. And the upper seat plate and the lower seat plate are fixedly connected with an upper building and a lower building respectively. The two ends of the vibration reduction assembly are connected with the bottom of the upper seat plate and the top of the lower seat plate correspondingly, and the vibration reduction assembly comprises multiple sets of high-rigidity springs arranged in an array. Each pre-pressing assembly comprises a first supporting frame, a second supporting frame, an adjusting screw rod and a locking nut, the first supporting frame and the second supporting frame are symmetrically arranged up and down, the two ends of the adjusting screw rod penetrate through the first supporting frame and the second supporting frame correspondingly, the locking nuts are in threaded connection with the two ends of the adjusting screw rod, and the damping assembly can be adjusted to be in a rated bearing state through the pre-pressing assemblies. The horizontal buffering and limiting assembly buffers and limits the horizontal relative movement between the upper base plate and the lower base plate. The vibration isolation support is small in size, light in weight and capable of pre-pressing and adjusting the rated load bearing of the vibration reduction assembly, and meanwhile has the buffering and vibration reduction function in the horizontal direction.

The invention provides a vehicle exhaust system which comprises an exhaust pipe and a standing wave breaking section, the standing wave breaking section is arranged on the exhaust pipe, the standing wave breaking section and the exhaust pipe jointly form an exhaust passage, and when the exhaust passage exhausts, standing waves with the frequency the same as the resonant frequency of the exhaust passage are generated in the exhaust passage; wherein a through hole is formed in the standing wave breaking section, the interior of the exhaust pipe is communicated with the exterior of the exhaust pipe through the through hole, the standing wave breaking section is arranged to be capable of generating sound waves with the frequency the same as that of standing waves through the through hole, and the position of the standing wave breaking section on the exhaust pipe is staggered from the antinode position of the standing waves. According to the vehicle exhaust system, original standing waves are broken into waves with shorter wavelengths through the standing wave breaking section, so that the resonant frequency of an exhaust passage is avoided, and the purposes of noise elimination and resonance reduction are achieved; meanwhile, the structure is small in size, capable of saving the space of a chassis, simple in structure, difficult to store water and capable of reducing corrosion of a tail pipe of the exhaust pipe.

The application aims to provide a low-frequency broadband sound insulation unit with ventilation and heat exchange functions, comprising an acoustic resonance cavity, a ventilation adjusting baffle, an elastic pre-tightening film, and a sound absorption rib group, wherein the acoustic resonance cavity comprises an upper cavity, a middle cavity, and a lower cavity from top to bottom, and the inner and outer sides of the acoustic resonance cavity are respectively provided with an inner ventilation hole and an outer ventilation hole; the ventilation adjusting baffle comprises a baffle and an adjusting handle, the adjusting handle is fixed on the baffle, the baffle is installed and constrained on the acoustic resonance cavity through an L-shaped positioning slot, one end of the elastic pre-tightening film is constrained through a film fixing device, and the other end is bonded with the end of the acoustic resonance cavity; and the sound absorption rib group is distributed in the upper cavity and the lower cavity. The application has the advantages of light weight, reliability, small space occupation, etc., can be arranged in a periodic array according to the size of the sound insulation space, has strong applicability, has double functions of sound insulation and heat exchange, and makes up for the disadvantages of deterioration of sound insulation quantity when the traditional sound insulation device has ventilation holes.

The utility model relates to the technical field of automobile body structures, and discloses an automobile engine ECU support which comprises a support body, the support body comprises an ECU protection face and an EUC installation face, first vertical rods are fixedly installed at the four corners of the bottom of the EUC installation face respectively, baffles are fixedly installed at the bottoms of the first vertical rods, and the baffles are fixedly installed at the bottoms of the first vertical rods respectively. A first rubber pad is movably installed on the surface of the first vertical rod, counter bores are formed in the two sides of the bottom of the first rubber pad, and through holes are formed in the tops of the counter bores. Through the structural design of the first vertical rod, the barrier plate, the first rubber pad, the counter bore and the through hole and mutual cooperation of the structures, the function of protecting the ECU is achieved, vibration and impact force in the vehicle running process can be absorbed and relieved, transmission of the force to the ECU is reduced, the stability of the ECU is ensured, the service life of the ECU is prolonged, and the service life of the ECU is prolonged. ECU faults caused by vibration of a traditional support are avoided, and then the reliability of the vehicle is improved.

The present invention discloses an acoustic device, comprising: a sound-emitting unit, the sound-emitting unit comprises a vibrating diaphragm, a sound outlet is arranged on the acoustic device, and the sound waves on the front side of the vibrating diaphragm are radiated outward through the sound outlet; a closed closed cavity is formed on the rear side of the vibrating diaphragm, and the closed cavity is divided into a first closed cavity and a second closed cavity by a partition, wherein the partition can be at least partially flexibly deformed, the first closed cavity is adjacent to the vibrating diaphragm, and the second closed cavity is far away from the vibrating diaphragm, and the volume of the second closed cavity is greater than the volume of the first closed cavity; the second closed cavity seals the sound waves generated by the flexible deformation part when deformed in the second closed cavity; at least a part of the housing of the electronic device for installing the acoustic device is used to form the first closed cavity and / or the second closed cavity. The acoustic device in the present invention can effectively reduce the resonant frequency and significantly improve the low-frequency sensitivity of the product as a whole.

This utility model provides an automatic feeding device for steel shot production, relating to the field of automatic feeding technology. It includes: a feeding mechanism, a collecting mechanism at the top of the feeding mechanism, a support frame, a main board at the top of the support frame, a flexible hopper at the lower end of the main board, a rubber vibration damper at the front end of the main board, and a side plate on the left side of the rubber vibration damper. This utility model designs the feeding hopper as a split structure, consisting of a main board, a side plate, and a second side plate. Rubber vibration dampers are installed between the main board and the side plates, and between the side plates themselves. When the feeding hopper is severely worn by the steel shot, it is not necessary to replace the entire feeding hopper; only the severely worn parts need to be replaced individually. Furthermore, the rubber vibration dampers can reduce the resonance frequency transmitted from the main board to the side plate, and reduce the resonance frequency transmitted from the first side plate to the second side plate, thereby reducing noise.

The invention relates to the technical field of vehicles, in particular to a roar control method and device of a hybrid power vehicle, the vehicle and a storage medium, and the method comprises the following steps: obtaining an in-vehicle noise value of the hybrid power vehicle; if the in-vehicle noise value is greater than the roar threshold value, determining a target resonant frequency according to the engine speed; and determining a target rotating speed change slope and a target rotating speed adjustment interval of the engine according to the target resonant frequency, and controlling an in-vehicle noise value of the engine to be smaller than or equal to a roar threshold value according to the target rotating speed change slope and the target rotating speed adjustment interval. Therefore, the problem that in-vehicle roaring is caused by resonance generated by coupling with a vehicle body mode at a certain rotating speed during feed low-speed driving of the hybrid electric vehicle is solved.

According to the technical scheme, the exhaust temperature sensor is characterized in that the exhaust temperature sensor comprises a mounting pipe and a temperature measuring head, the temperature measuring head is arranged at the first end of the mounting pipe and extends out of the second end of the mounting pipe through a wire, the mounting pipe comprises a main rod and a sliding rod, and the main rod is provided with a nut, a first damping part, a second damping part and a control part; the multiple sets of first damping parts are arranged in the circumferential direction of the main rod at equal intervals. A mounting gap is reserved between every two adjacent first damping parts, and the second damping parts are arranged in the mounting gaps in a one-to-one mode. The end, facing the sliding rod, of the main rod is provided with a mounting part for mounting the control piece, and the control piece is rotationally connected to the mounting part and is in linkage with each second damping piece. One end, facing the main rod, of the sliding rod is provided with a plugging part, a rotation limiting structure is arranged between the plugging part and the mounting part, and the temperature sensor can improve the contact area with the wall of a mounting pipe, reduces the temperature influence, and is not influenced by the mounting position.

The present invention discloses a high static and low dynamic vibration isolator for a ship diesel engine, which relates to the field of vibration isolators, and comprises a bottom shell, the bottom shell is mounted on a mounting block at the bottom of a ship main engine, a bearing plate is slidably mounted on the inner top side of the bottom shell, the top of the bearing plate is fixedly connected with symmetrically arranged guide rods, the bearing plate is slidably mounted on a fixed block through the guide rods, the fixed blocks are provided with two, the mounting block is fixed between the two fixed blocks, a screw is inserted on the fixed block, and a symmetrically arranged guide groove is provided on the bottom wall of the bottom shell. The present invention adopts multiple groups of springs to improve the vibration isolation efficiency, and can effectively prevent the vibration isolator from being too statically deformed while bearing a higher load, and has a good vibration isolation effect, so that the resonance frequency of the ship diesel engine vibration isolator is reduced, and at the same time, the stability of the ship main engine can be ensured, and the low-frequency vibration isolation effect can be effectively improved.

This utility model discloses a wireless controller with automatic magnetic pole positioning function, belonging to the field of wireless controller technology. It includes a controller and a mounting plate. The lower surface of the controller is provided with a sliding groove, and the upper surface of the mounting plate is provided with a shock-absorbing component. In this utility model, by providing the shock-absorbing component, during the movement of the controller, the travel block slides within the travel groove under the limitation of the limiting rod. Under the action of the shock-absorbing spring, the movement distance of the travel block is controlled, thereby controlling the up-and-down vibration frequency of the controller under the action of the connecting rod and the damping shock absorber. This realizes the shock-absorbing function of the wireless controller, improves the vibration reduction effect during operation, reduces the resonance frequency of the wireless controller, further reduces the possibility of loosening of internal components during operation, and improves the service life and stability of the wireless controller.

The utility model relates to the technical field of electroacoustic conversion, in particular to an acoustic device and electronic equipment, the acoustic device comprises a shell, a sounding unit and a plurality of flexible parts, the shell is provided with an accommodating cavity, and the shell is provided with a first sound hole; the sound production unit is arranged in the accommodating cavity, a rear cavity is separated from the accommodating cavity, and sound waves of the sound production unit are radiated to the outside of the shell through the first sound hole; the plurality of flexible parts are arranged in the rear cavity and divide the rear cavity into a first cavity body and a plurality of second cavity bodies, at least part of the first cavity body takes the sound production unit as a side wall, and each flexible part is located between the first cavity body and one second cavity body. Through the arrangement, the equivalent sound order of the first accommodating cavity can be increased, so that the resonant frequency of the acoustic device is effectively reduced, and the low-frequency sensitivity is improved.

The invention relates to the technical field of vibration sensing, in particular to a self-powered three-degree-of-freedom absolute vibration sensor. The device comprises a hanging block, a connecting rod mechanism is assembled on the outer side of the hanging block, the connecting rod mechanism comprises an X-shaped rod set, supporting columns, a buckling beam, a piezoelectric ceramic piece, a detachable damper, a bottom ring, a top ring and a power management circuit, and the three supporting columns are evenly distributed and fixed to the bottom of the hanging block. According to the invention, the suspension block can obtain an extremely low resonant frequency in the horizontal direction through the well designed connecting rod mechanism, the extremely low resonant frequency in the vertical direction is realized through the X rod group, the combination of the two can realize the capture of ultra-low frequency vibration in a three-dimensional space, and the sensitivity is high. And meanwhile, mechanical energy generated by vibration can be converted into electric energy through the piezoelectric buckling beam, and the relative displacement measurer is driven to work, so that self-powered measurement is achieved, use is more environmentally friendly and convenient, the overall structure is compact, transportation is more convenient, and practicability is high.

The daily use goods sorting device based on the Internet of Things comprises a workbench, three openings are formed in the inner wall of the workbench, the outer walls of the three openings are fixedly connected with a first sliding way, a second sliding way and a third sliding way correspondingly, and the outer wall of the workbench is fixedly connected with a rotating shaft; the inner wall of the rotating shaft is rotatably connected with a first connecting column, the outer wall of the first connecting column is rotatably connected with a conical sliding table, the bottom of the conical sliding table is fixedly connected with the outer wall of the workbench, the outer wall of the connecting plate is fixedly connected with a connecting block, and the outer wall of the connecting block is fixedly connected with the outer wall of the first connecting column. When articles need to be sorted, the articles fall onto a conical sliding table, then a first motor is started, the first motor can drive a connecting plate and the surface of the conical sliding table to rotate during movement, the articles can be pushed from a small opening, a middle opening, a large opening and a third sliding way in sequence, and therefore the effect that the multiple articles can be sorted in sequence is achieved.

The utility model relates to the technical field of acoustic detection, in particular to an acoustic sound absorption performance detection sample piece with a spiral groove, which comprises a sealed shell with a resonant cavity, one surface of the shell protrudes inwards to form a convex block, and the convex block is provided with a spiral groove. A spiral groove is formed in the surface, provided with the protruding block, of the shell in the direction of the protruding block, and the spiral groove is communicated with the resonant cavity. The spiral groove is located in the protruding block of the detection sample piece, namely the neck of the resonator, the equivalent length is increased, the size is compressed, the spiral groove can achieve a long sound channel path in a very small physical space, equivalently, the equivalent neck length is increased, and a very long linear structure is not needed. Besides, low-frequency resonance can be realized while the small size can be kept through the structural arrangement, and the resonant frequency under a given volume can be made lower by taking the convex block with the spiral groove in the detection sample piece as the neck part.

The utility model belongs to the technical field of constructional engineering, and particularly relates to a light modular equipment base system. Comprising a plurality of equipment base units, and each equipment base unit comprises a concrete base, a vibration isolator, a steel structure column foot, first profile steel and second profile steel; the bottom of the vibration isolator is fixedly connected to the top of the concrete base; the bottoms of the steel structure column feet are fixedly connected to the tops of the vibration isolators, and the tops are used for installing equipment; the two transverse side walls of a stand column of the steel structure column foot are symmetrically connected with two pieces of first profile steel arranged in parallel correspondingly, and the two longitudinal side walls of the stand column of the steel structure column foot are symmetrically connected with two pieces of second profile steel arranged in parallel correspondingly. The equipment base units are at least connected with one adjacent equipment base unit through the first profile steel or the second profile steel, so that all the equipment base units form an integral frame. The fixing and vibration isolation mounting base is provided for equipment, meanwhile, the using amount of concrete is reduced, the overall weight is light, and the manufacturing cost is low.

The utility model discloses a sound-absorbing and noise-reducing integrated design structure of a wall decorative surface, which comprises an outer layer frame, an inner layer frame, an inner layer frame and a sound-absorbing and noise-reducing layer, the inner-layer frame is arranged in the outer-layer frame; the connecting profile is arranged at a splicing gap between the outer-layer frame and the inner-layer frame; the transverse supporting piece is arranged in the inner-layer frame; the covering cloth covers the surface of the outer-layer frame, and the edge of the covering cloth extends to the back surface of the outer-layer frame; the third aluminum profile is fixedly installed on the holding cloth, and the veneer is fixedly installed on the third aluminum profile. Compared with the prior art, the problem that sound insulation and noise reduction capacity is insufficient due to the fact that sound in a partition wall surface layer decoration material is transmitted through vibration between the surface layer plate and the base layer plate is solved.

Disclosed is an attachment structure for attaching a compressor to an attachment surface of a vehicle. The compressor is provided with a rotating body including a rotating shaft and a compression mechanism provided on at least one end of the rotating shaft in the axial direction. The compressor is further provided with a radial bearing that supports the rotating shaft, a thrust bearing that supports the rotating shaft, and a housing that accommodates the rotating body, the radial bearing, and the thrust bearing. The radial bearing and the thrust bearing are gas bearings. The mounting structure is provided with a mounting foot which is fixed to the housing and the mounting surface and is composed of an elastic member. The resonant frequency of the mounting foot is less than the resonant frequency of the radial bearing and less than the resonant frequency of the thrust bearing.

The utility model relates to the technical field of antennas, and discloses an air dielectric satellite positioning antenna, which comprises an antenna metal sheet and a metal reflecting plate, a metal branch foot part, a signal feed foot part and a metal supporting foot part are arranged on the antenna metal sheet, and the metal supporting foot part is fixedly connected with the metal reflecting plate in an insulating manner. According to the utility model, the distribution of electric field lines at the edge of the metal antenna in the cavity resonance structure is changed through a metal stamping process, the miniaturization of the cavity resonance structure is realized, and the weight problem of the ceramic antenna is solved.

The invention discloses a well drilling system and method for preventing borehole wall instability in the goaf penetrating drilling process, and belongs to the technical field of well drilling machinery. The invention aims to provide a well drilling system capable of effectively preventing well wall instability in the drilling process of penetrating through a goaf. According to the technical scheme, the device comprises a motor, a speed reducer, a clutch, a square drill rod, a rotary table, a transmission rod, a drill rod, a guide rod and a drill bit, the motor is connected with the upper end of the square drill rod through the clutch and the speed reducer, the lower end of the square drill rod penetrates through the rotary table and then is connected with a first universal coupling, and the first universal coupling is connected with the upper end of the transmission rod through a universal joint; the lower end of the transmission rod is connected with a second universal coupling through a cross rod, the lower end of the second universal coupling is connected with the upper end of a drill rod through a flange, the lower end of the drill rod is connected with a rubber sheet, a solution shock absorber is connected below the rubber sheet, the lower end of the solution shock absorber is connected with the upper end of a guide rod, and the lower end of the guide rod is connected with a drill bit. The method is used for drilling through the goaf.