190results 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 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 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 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 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 relates to a wind turbine, in particular to a variable-pitch wind turbine. The top end of the spindle of the generator is provided with a connecting sleeve; a wind plate is inserted into the connecting sleeve; an inner rotating shaft of the wind plate is inserted to the connecting sleeve rotationally; the outer rotating shaft of the wind plate is inserted into the inner side of a connecting ring rotationally; the connecting ring and the connecting sleeve are concentric; a ring pull rod is arranged in the annular tubular inner cavity of the connecting ring; the top end of the outer rotating shaft is matched with the annual pull rod through a cam and a cam slot; the rotational loop is sleeved on the connecting ring; a main paddle is fixedly arranged on the loop; a loop torsion spring is arranged between the loop and the connecting ring; a strip locking groove is formed on one side of the loop; the pull rod is fixedly connected with a bolt; and the position of the bolt corresponds to that of the looking groove. The deflection angle of the paddle of the wind turbine remains constant so as to avoid resonance caused by the change in the deflection of the paddle; when there is strong wind, the main paddle can lean a certain angle back, so that the effective wind receiving area of a wind wheel can be reduced to protect the paddle from being damaged by the strong wind.

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 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 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.