191results about How to "Avoid resonance phenomenon" patented technology

The invention discloses a fan. The fan comprises an impeller, a motor and a fan frame. The impeller and the motor are received in the fan frame; the motor is connected with the impeller and drives the impeller to rotate, wherein, the impeller is provided with a hub and odd number of fan blade sets which are annularly arranged on the periphery of the hub; each fan blade set is respectively provided with a plurality of fan blades; and the fan blades in each fan blade set are the same or different with each other.

The invention discloses a matching method of powerplant parameters to prevent an automobile cab from resonating at a common speed, comprising the following steps of: 1. carrying out a match determination which meets the dynamic property and fuel economy on engine and transmission parameters according to the basic performance of an automobile; 2. preventing the automobile cab from resonating in a common speed range, which comprises: determining the common speed range of the automobile, determining each order natural frequency of the cab and primary vibration modes influencing the comfort of the cab by adopting a finite element analysis model, determining a common speed range in which an excitation frequency of wheel rotating is similar to or coincides with the natural frequency of the cab,and enlarging the wheel radius so that a rotation frequency of the wheels does not coincide with the natural frequency of the cab; and 3. re-checking if parameters of the automobile power transmission device change the optimum state of the dynamic property and fuel economy of the automobile, if not, designing and optimizing the powerplant parameters which meet the dynamic property, fuel economy, and comfort of the automobile according to the operation in step1 to step3.

The invention discloses a reinforcing structure of a saloon car rear floor spare wheel groove, and is characterized in that the reinforcing structure is that the spare wheel groove tends to be closed up from front to rear; T-shaped ribs are arranged by taking a spare wheel installation point as a center, and line ribs are distributed at the rear end of the spare wheel installation point at equal width intervals; and straight ribs are arranged at the periphery of the spare wheel installation point. Due to the adoption of the structure, the reinforcing structure has the following advantages that 1. The spare wheel groove resonance phenomenon in the car running process is avoided with a lower cost, and the NVH (noise, vibration and hardness) performances of the entire car are enhanced; and 2. The reinforcing structure is easy to realize by a punching process, and is worthy of industrially popularizing and applying.

The expansion joint regulator member consists of expansion back and cast expansion beams on sides of the expansion back. The expansion beams are equal in length and parallel, and the expansion back has its top and bottom planes coinciding with the top and bottom planes of the expansion beams. The expansion joint regulator consists of two identical members inserted mutually. The member is formed through once casting. The expansion joint regulator with two identical members inserted mutually can avoid resonance caused by the impact of the running vehicles, and prolong the service life of bridge and other buildings.

The invention relates to an RWD automobile gearbox transmission error detection test bench and a comprehensive testing method, and belongs to the technical field of automobile gearbox detection. The test bench comprises a test bench device and an adjustment and supporting device. The test bench device comprises an AC drive motor, an input end elastic shaft coupler, an input end transmission error comprehensive detection device, an input end cv-joint synchronous universal shaft coupler, a gearbox input spline shaft, a tested gearbox, a gearbox output flange shaft, a first output end elastic shaft coupler, an output end transmission error comprehensive detection device, a second output end elastic shaft coupler, a two-gear reduction gearbox, an output end cv-joint synchronous universal shaft coupler, and an AC loading motor. The test bench is advantageous in that the device employs a U-shaped layout and reduces the area of an occupied land; the test bench can measure the static and dynamic transmission errors of the gearbox at the same time; the test bench employs the two-gear reduction gearbox and a sliding table mechanism, can meet the testing requirements of different types of gearboxes, and improves the universality of the test bench.

The invention discloses a weather-resisting chemico-mechanical polishing pad. The problem that an existing polishing pad is poor in weather resistance is solved through the weather-resisting chemico-mechanical polishing pad. The weather-resisting chemico-mechanical polishing pad at least comprises a polishing layer, a buffering layer and a transparent bottom pad body from top to bottom. All the layers are bonded through pressure sensitive adhesives or tackiness agents. The weather-resisting chemico-mechanical polishing pad is characterized in that the polishing layer is formed by mixing and solidifying a weather-resisting polyurethane prepolymer, a curing agent and a functional filler, the weather-resisting polyurethane prepolymer is formed by conducting a reaction between polyol and weather-resisting multifunctional isocyanate, and the molecular structure of the weather-resisting multifunctional isocyanate does not contain a benzene ring, or an isocyanate group in the molecular structure is indirectly connected with a benzene ring. The weather-resisting chemico-mechanical polishing pad is simple in process and low in cost and has excellent weather resistance.

The invention discloses a pipeline distributing system of a compressor and an air conditioner with the same. The pipeline distributing system comprises an air discharging pipeline and an air returning pipeline, wherein the air returning pipeline is provided with an L-shaped bent pipeline section which is positioned at the bottom of the air returning pipeline. Without adopting additional balance weight, the pipeline distributing system has shorter distributed pipeline and favorable vibration attenuation.

The invention introduces a method and a device for winding multi-ply filament on a rotating bobbin spindle to be a drum. The filament is respectively and reciprocally guided before the filament is paved on the drum and partially moves on the circumference of a rotatable back-up roller in a winding way. In order to keep winding speed which is basically constant, the operation speed of the bobbin spindle is continuously changed. Thereby excitation which is formed produces influence on the component which is fixed through a branch support stand of a frame, wherein each component is respectively provided with a certain fixed frequency. In order to avoid critical vibration status in the component, the fixed frequency is changed according to the operation rotary speed of the bobbin spindle through a rigidity reinforcing device of a branch supporting stand which can be converted on at least a component according to the invention. Therefore the branch supporting stand is provided with a mechanism for controlling the rigidity of the branch supporting stand, thereby changing the fixed frequency of the relative component during the winding period of the filament.

The invention provides an intelligent bed system for computer control. The system comprises a massage bed, and a computer for control over the massage bed. The intelligent bed system for computer control has following beneficial effects: movable rods that are needed to be moved and strokes thereof are determined by taking into consideration user's related data and selecting massage modes so that personalized massage can be achieved and the best massage effect is obtained; and in the meantime, waste of unnecessary power supplies is avoided by precisely controlling stroke of each movable rod during application.

A variable friction-type spherical surface-cylindrical surface friction-type support relates to a friction-type support, which is designed to solve the problems that resonance is produced by a structure and that structural seismic response is increased due to rigidity and constant damping of the existing friction pendulum support, wherein a slide groove is mounted on an upper end face of a connection steel plate; a slide block is located inside the slide groove; an upper portion of the slide block is a hemisphere shape; a hemisphere recess cooperated with the slide block is processed in the middle position of a lower end of an end cover; the end cover is supported on an upper end face of the slide groove through the slide block; an outline of the left half portion of the slide groove is shaped as a rectangle and the outline of the right half portion of the slide groove is shaped as a semicircle; a cylindrical groove is processed on the left half portion of the slide groove; a spherical recess is processed on the right half portion of the slide groove; a cambered surface radius of the cylindrical recess is set in a same way with the cambered surface radius of the spherical recess; the cylindrical recess and the spherical recess are connected in a smooth transitional way to form a complete slide surface; the upper end face of the slide groove is divided with at least two concentric circles in order from the center to the outside; and the friction coefficient at the concentric circle position from inside to outside is sequentially increased. The variable friction-type spherical surface-cylindrical surface friction-type support is used for vibration insulation for a large-span space structure.

The invention discloses an automobile spare tire installing structure, which comprises a spare tire pool arranged on a back floor, wherein the spare tire pool comprises a spare tire pool front part and a spare tire pool back part; the spare tire pool front part is of a circular arc structure; the spare tire pool back part extends out in the tangential direction of the circular arc of the spare tire pool front part; the cross section of the spare tire pool back part is in a U shape; an installing support frame used for installing an automobile spare tire is arranged in a connecting position of the spare tire pool front part and the spare tire pool back part; structure reinforcing structures are arranged on the periphery of the installing support frame and at the spare tire pool front part and the spare tire pool back part. The automobile spare tire installing structure has the advantages that the carrying capability is high; the structure is simple; the manufacturing process is simple; good modal stiffness performance is realized; the light-weight requirements can be met.

The invention discloses a water-cooled canned pump. The water-cooled canned pump comprises a shell and a pump body. One end of the shell is fixedly connected with the pump body through a positioning connecting piece. The other end of the shell is provided with an end cover. Stators and rotors are arranged in the shell. A cooling water driver is arranged on the top face of the shell and connected to the portion, close to a liquid outflow flange plate, of the pump body through a water conveying pipe. A liquid chamber and a vacuum chamber are formed in the shell. The liquid chamber is located in the center of the vacuum chamber. The liquid chamber and the vacuum chamber are separated through a shielding film. The stators are located in the vacuum chamber. The rotors are located in the liquid chamber. A buffering device is arranged in a base. The water-cooled canned pump is simple in structure and high in practicality; the difficulty of the manufacturing process of the canned pump is lowered, maintenance cost is reduced, and the canned pump is more convenient to mount and dismount; and the main rotor and the auxiliary rotors are used in cooperation, the working efficiency of the rotors can be effectively improved, and resistance generated due to gaps between the stators and the rotors is offset.

The invention provides a server fan speed control method and a device. Under the control of a server to a fan, different control frequencies are adopted for a plurality of fans so that vibration points and noise points of each fan are at different frequencies. In addition, rotary speed is no longer fixed at the same speed, instead, the rotary speed is calculated according to the sampling values ofa temperature acquisition module to meet the base speed and the current maximum speed of cooling requirement. Through the control of the server, multiple fans adjust dynamically in the range of the lowest and the highest speed, the time for each fan to reach the maximum rotary speed is different so that noise is reduced effectively and resonance phenomenon is avoided. In terms of hardware, the way that one signal controls multiple fans is changed, each fan is corresponding to one single control signal, so that the condition that all the fans fail to operate if a driving end of a fan is fail is avoided, and stability of system is strengthened.

The invention relates to the technical field of electric power, and specifically relates to a distribution network capacitive current distribution compensation method. The method comprises the steps as follows: S1, getting data information related to a distribution network, and determining the variables of a mathematical model and the value spaces thereof; S2, determining constraint conditions according to the system's requirement for compensation capacity; S3, building an objective function, with the magnitude of grounding residual current as a measure of compensation effect and minimal grounding residual current and lowest cost as the objective; and S4, optimizing and solving the objective function to get an optimal configuration scheme. According to the distribution compensation method, the configuration scheme of arc suppression coil distribution compensation is determined reasonably based on the magnitude of capacitive current of each line and by considering the possibility of line operation mode change. Thus, the resonance phenomenon caused by capacity decrease of the arc suppression coil is avoided, and a good compensation effect is achieved with small investment on equipment transformation.

The invention provides a motor operation frequency adjustment method and apparatus. The motor operation frequency adjustment method comprises the steps of detecting vibration amplitude of a motor by adisplacement sensor arranged in the motor; judging whether the vibration amplitude of the motor is greater than a preset amplitude or not; and if so, adjusting the input voltage of the motor so as toadjust the operating frequency of the motor not to equal to the inherent frequency of the motor. By virtue of the scheme disclosed in the invention, occurrence of a resonance phenomenon can be avoided effectively, the overall vibration and noise of the motor can be lowered, and user experience can be improved; and meanwhile, the whole detection and adjustment process is completed automatically, so that the overall vibration of the motor is greatly lowered, and the service life of the motor can be prolonged effectively.

The invention discloses a hollow anti-resonance optical fiber. A Fano resonance phenomenon can be effectively avoided by arranging a U-shaped glass structure 5 in a capillary tube 4 and enabling a contact node of the capillary tube 4 to be far away from a fiber core region 1 so that the optical fiber has a stable loss spectrum characteristic, and a relatively large transmission bandwidth is obtained; and the relatively large transmission bandwidth is ensured, the cavity of the capillary tube 4 is divided into the first type of holes 6 and the second type of holes 7 by adjusting the U-shaped glass structure 5 so that the areas of the cavities of the capillary tube 4 and the U-shaped glass structure 5 are uniformly distributed, the leakage between two glass layers (high refractive index layers) can be smaller, and an optical fiber loss is further reduced.

The invention discloses a mine crusher anti-resonance method and a system thereof. The method comprises the following steps: 1, arranging a vibration sensor on the body of the crusher, and arranging a current transformer on the main circuit of the motor of the crusher; 2, acquiring the natural frequency of the crusher under different loads and its corresponding crusher amplitude, establishing a standard modal curve, and inputting the curve to a PLC controller; and 3, obtaining the current amplitude of the crusher through the vibration sensor arranged on the body of the crusher, comparing the natural frequency with the corresponding amplitude under current load, and dynamically adjusting the excitation frequency according to the standard modal curve by the PLC controller when the current amplitude approaches the amplitude corresponding to the natural frequency. The extraneous excitation frequency is automatically adjusted according to the current load condition of the crusher to avoid the natural frequency of the current crusher in order to avoid the resonance phenomenon of the crusher. The method is simple and reliable, and can prolong the service life of the crusher.

The invention relates to a combined phase shifter comprising a cavity which comprises a first sub-cavity, a second sub-cavity and a third sub-cavity which are arranged separately; a phase shifter module which comprises a first phase shifter and a second phase shifter, wherein the first phase shifter is located in the first sub-cavity, the second phase shifter is located in the second sub-cavity and the first phase shifter and the second phase shifter operate in different frequency bands respectively; and a combiner module which is located in the third sub-chamber and electrically connected with the first phase shifter and the second phase shifter respectively so as to combine and output the frequency band signals outputted from the first phase shifter and the second phase shifter. Therefore, the mutual influence and interference among the modules can be effectively reduced, the isolation among the modules can be greatly improved and the physical size of each sub-cavity is relatively reduced when the overall size of the cavity is unchanged so that the resonance frequency of the cavity can be raised to the working frequency far away from the phase shifter and the resonance phenomena can be effectively avoided.

The invention belongs to the technical field of ultra-precision vibration damping and discloses a self-adaption remote active vibration damping system. The self-adaption remote active vibration damping system at least comprises a main support device, a remote vibration damping device, a liquid transmission pipeline (4) and a controller (9). The liquid transmission pipeline (4) and the controller (9) are connected in parallel, and two ends of the liquid transmission pipeline (4) and the controller (9) are correspondingly connected with the main support device and the remote vibration damping device to form a closed loop structure. The remote vibration damping device is a closed container with an air charging and discharging interface. The remote vibration damping device is filled with compressed gas and viscous liquid (6). A throttle valve or a damper (5) is arranged on the liquid transmission pipeline (4). The self-adaption remote active vibration damping system can achieve a vibrationisolation in a narrow space, and can self-adaptively adjust the air intake of an air spring and the flow of a current limiting device according to a vibration isolation object in real time, so that asecondary active vibration isolation for the vibration isolation object is achieved. The self-adaption remote active vibration damping system not only has high vibration isolation accuracy, but alsohas the characteristics of a small installation space, a flexible size and strong environmental adaptability.

The invention discloses a transformer noise detection damping system comprising a damping system, a sound measuring unit, a communication unit, and a main station system. The damping unit is a device used for damping of a transformer. The sound measuring unit is used for monitoring the operation sound of the transformer during operation, and is used to transmit the operation sound to the main station system by the communication unit. The main station system is used for processing feedback information. The invention provides a solution, which is capable of combining transformer noise control and transformer state monitoring, is easy to implement, and has low monitoring costs. With the gradual popularization and application of the transformer noise detection damping system, the noise pollution of the distribution transformer on nearby residents is effectively reduced, and at the same time, the operation state of the distribution transformer can be continuously monitored, and an important support is provided to improve power supply reliability and reduce the various operation faults of the distribution transformer.

The invention provides a method for retraining vibration of a rotary shaft system and belongs to the technical field of vibration restraint. The problems that an existing method for restraining vibration generated when a rotary shaft system quickly passes through resonant frequency cannot eliminate resonance and is strict for requirements for a drive element, and the vibration ranges of the shaft system at different working rotating speeds differ are solved through the method. According to the method, a piezoelectric adjusting ring is arranged on the side faces of the inner rings or the outer rings of bearings in the rotary shaft system, when the rotating speed of the rotary shaft system is close to certain resonant frequency of the rotary shaft system, direct current excitation signals are applied to the piezoelectric adjusting ring, and the thickness of the piezoelectric adjusting ring is increased under the inverse piezoelectric effect, so that the pre-tightening force of the bearings is increased, the supporting rigidity of the bearings is correspondingly increased, and finally the resonant frequency of the rotary shaft system is increased; when the rotating speed of the rotary shaft system stably exceeds the original resonant frequency, the piezoelectric adjusting ring is powered off, the resonant frequency of the rotary shaft system is changed into the original resonant frequency, and therefore resonance is avoided. The method is applied to the field of vibration restraint.

The invention discloses an electric feedback type small engine test bench, which comprises a platform, a processor module, an electric feedback module and a test module, wherein the platform comprisesa working table, a table lifting plate and a chassis frame, an engine under test is fixed on the working table, the table lifting plate is located under the working table and right above the chassisframe, and the chassis frame is located below the platform and matched with the table lifting plate; the electric feedback module comprises a generator and an electric feedback unit, a rotor of the generator is rotatably connected with a rotor of the engine, one end of the electric feedback unit is connected to an output end of the generator, and the other end is connected to a power grid or an energy storage device. The electric feedback type small engine test bench has the substantial effects that the generator is enabled to recycle the mechanical energy in the testing process of the engine,the use of a load is reduced, and a shock absorbing module is utilized to reduce the vibration of the platform through changing the inherent frequency of the platform. Disclosed by the invention is an engine testing method which adopts the generator to serve as a load. The test accuracy is improved according to the method.

The invention relates to an overhead line. The overhead line mainly comprises an insulating sleeve, steel cores and aluminum lines, wherein the lower surface of the insulating sleeve is a flat and straight surface; the upper surface of the insulating sleeve is an arc-shaped surface; the arc-shaped surface is symmetrical with respect to the median section of the flat and straight surface; the steel cores penetrate into the left side and the right side in the insulating sleeve symmetrically; the aluminum lines wrap the outer periphery of the steel cores. According to the overhead line, the weight of the overhead line can be effectively reduced; high-efficiency radiating can be realized; cable vibration can be weakened; accumulated snow on a cable can be blown off autonomously; therefore, large-span and safer electricity transmission can be realized by the overhead line.

A device used for opening and closing channel ports in valve body is prepared as coordinating the housing wall of spring housing with internal wall of open-slot regulation base, setting spring in spring housing, welding steel balls with spring housing and erecting said spring housing in said open-slot regulation base.

The embodiment of the invention discloses a powerful mixer control method and system. A powerful mixer comprises a stirring paddle motor and a stirring paddle frequency converter. The stirring paddle motor drives a stirring paddle to rotate under the control of the stirring paddle frequency converter. The method comprises the following steps: detecting the amplitude of the powerful mixer within the operating frequency range of the stirring paddle frequency converter; determining whether resonance occurs according to the amplitude of the powerful mixer; when it is determined that resonance occurs to the powerful mixer, obtaining the operating frequency of the stirring paddle frequency converter corresponding to the resonance as resonant frequency; and controlling the stirring paddle frequency converter in the powerful mixer to avoid the resonant frequency. The method detects the amplitude of the powerful mixer when the stirring paddle frequency converter operates in the whole operating frequency range, finds out the operating frequency of the stirring paddle frequency converter corresponding to the resonance of the powerful mixer as the operating frequency, and controls the stirring paddle frequency converter not to operate in the resonant frequency so as to avoid the resonance of the powerful mixer and to protect the powerful mixer against damage.

The invention discloses a wind-power tower barrel based on a stay cable-steel beam self-balance system, and relates to the technical field of wind power generation. The system comprises a fan, the tower barrel, a stay cable, a linking beam, a stay cable vibration-attenuation damper, a mass damper and a base, wherein the two ends of the stay cable are separately anchored on the tower barrel and thelinking beam; the linking beam is connected with the tower barrel, and the end part of the linking beam is connected with the base; one fan is arranged on the top of the tower barrel, and the mass dampers is arranged on the tower barrel; and the stay cable vibration-attenuation damper is mounted on the stay cable. According to the tower barrel, the stay cable is arranged to reduce bending momentof a tower body, so that the tower barrel main bears vertical axial pressure, and therefore, strength of the material can be sufficiently utilized, and the section dimension of the tower barrel is reduced. The tower barrel is simple in structure, is good in vertical and integral stability, and is a brand-new wind-power tower barrel structural form.

The invention discloses a rubber damping rubber gasket combined structure of an engine suspension. The rubber damping rubber gasket combined structure of the engine suspension comprises rubber damping rubber gasket bodies. Axle holes are formed in the center positions of the rubber damping rubber gasket bodies in the axial direction, a suspension beam installation mechanism is arranged on the rubber damping rubber gasket bodies, an engine suspension beam is fixed into the suspension beam installation mechanism, the rubber damping rubber gasket bodies are matched and fixed onto a frame lug through a connector and the axle holes, and a bushing is arranged between the inner walls of the rubber damping rubber gasket bodies and the connector. The rubber damping rubber gasket bodies are of pure rubber structures, the rubber hardness can be controlled through component ratios of rubber, thus requirements of stiffness and intensity can be met, the internal friction and damping of the rubber after deformation are bigger, the phenomenon of producing resonance with a vehicle is avoided, the damping effect is stable, the vibration noise can be reduced, vibration comfort is better, and the consistency control is better; the axial height is limited through arranging the bushing, installation in place is easy, and assembly is more convenient.

The invention discloses an intelligent Internet-of-Things software test information diagnosis circuit and a repair method thereof. The circuit comprises a power supply control module, a voltage stabilization output module, a signal acquisition operation module, an anti-interference module and a signal diagnosis comparison module, a triode Q1 and a triode Q2 in the power supply control module are connected in series to form a Darlington tube, and the control response speed of current is increased; in the voltage stabilization output module, an electric signal with a high noise ratio is providedfor the next module by utilizing a series connection relationship between a resistor and a capacitor; a capacitor C3 in the signal acquisition and operation module stores the acquired signal to prevent the effective reduction of the detection signal, so as to accelerate the quick response of the acquisition and operation signal; an inductor L1 and an inductor L2 in the anti-interference module are connected with each output branch, so that the anti-interference module has the capability of inhibiting interference; a field-effect tube in the signal diagnosis and comparison module selects different output ends through a triode Q4 according to data results of acquisition and operation, and then damaged detection signals are repaired and adjusted, so that diagnosis and repair effects are achieved.

The invention discloses an oil-immersed type transformer. Key points of a technical scheme provided by the invention are as follows: the oil-immersed type transformer comprises an oil tank filled with transformer oil, an iron core, a coil winding and a foot pad, wherein the iron core and the coil winding are arranged in the oil tank, and the foot pad is arranged below the oil tank; radiators are arranged on the side walls of the oil tank and comprise a plurality of cooling fins capable of covering the side walls of the oil tank, and each cooling fin comprises a heat-dissipation cavity capable of accommodating the transformer oil; the foot pad is a reverse H-shaped steel channel; one side of the foot pad corresponding to the oil tank is fixedly connected with the oil tank, and a bolt hole is formed in the other side of the foot pad corresponding to the oil tank; an oil conservator is arranged above the oil tank, an oil level indicator for measuring the oil level of the transformer oil is arranged on the oil conservator; an oil discharge plug for changing the transformer oil is arranged on one side of the oil tank corresponding to the foot pad, and a vibration-reduction cushion is arranged at a position, corresponding to the iron core, in the oil tank. The oil-immersed type transformer provided by the present invention increases the heat-dissipation area of the radiators and effectively improves the heat dissipation effect of the transformer.