9results about How to "Avoid abnormal vibration" patented technology

The invention discloses an abnormal vibration control rod positioning method and system based on neutron noise signals and a medium. Relates to the technical field of control rod monitoring. According to neutron noise signal data measured by a self-powered neutron detector, whether the control rod has abnormal vibration or not is evaluated, and the cause of the abnormal vibration is determined; then calculating a transfer function between the control rod and a neutron detector by using a neutron transport equation, and determining the position of the control rod with abnormal vibration through a minimization algorithm theory; the problem that abnormal vibration of the in-reactor control rod cannot be monitored is solved, abnormal vibration of the control rod is avoided, and safety and reliability of the reactor control rod are powerfully guaranteed.

This application provides a method, apparatus, device, vehicle refrigerator, and vehicle for controlling a vehicle refrigerator compressor, relating to the field of vehicle technology. The method includes acquiring the resonant speed of the vehicle refrigerator compressor and a pre-constructed set of operating speeds; the pre-constructed set of operating speeds includes compressor speeds corresponding to different vibration and noise performance characteristics; selecting a target operating speed from the pre-constructed set of operating speeds that avoids the resonant speed, and controlling the compressor to operate at the target operating speed. This application alleviates the limitations of traditional methods that solely limit speed in pursuit of NVH (Noise, Vibration, and Harshness), achieving a dynamic balance between NVH performance and cooling efficiency in vehicle refrigerators, effectively resolving the contradiction between slow cooling and vibration noise, and significantly improving user experience and overall vehicle comfort.

This utility model relates to a display device, which includes a display panel, a back plate, a rear shell, and a speaker assembly. The speaker assembly includes a speaker housing, at least one first speaker, and at least one second speaker. The diaphragm of the first speaker is exposed on the back of the speaker housing and faces the rear shell; the diaphragm of the second speaker is exposed on the front of the speaker housing and faces the back plate. A venting channel is provided on the front of the speaker housing, and the diaphragm of the second speaker is disposed within the venting channel. At least one end of the venting channel extends to the side edge of the speaker housing and forms an outlet. The diaphragms of the first and second speakers exert opposite forces on the speaker housing, thereby reducing the resultant force of the diaphragm vibration on the speaker housing and weakening or eliminating the vibration of the speaker assembly. Abnormal air pressure generated by the vibration of the second speaker can be discharged through the outlet of the venting channel, eliminating abnormal vibration of the display device.

The present invention relates to the technical field of grinding devices, and specifically discloses a multi-stage grinding device of a vertical roller mill for cement production, including a shell, a grinding disc is rotatably arranged in the shell, two rollers are arranged on the top of the grinding disc, a cone is rotatably connected to the middle of the grinding disc, a two-stage grinding box is arranged above the cone, the two-stage grinding box is connected to the side wall of the box, a rotor is arranged at the top of the box, and a funnel is arranged below the rotor. In the present invention, large-particle materials enter the two-stage grinding box, and the two-stage grinding roller grinds the large-particle materials. The ground small-particle materials are pushed out by spiral blades and blown to the vicinity of the rotor by the rising air flow in the shell, and the powder after secondary grinding is collected. The large-particle powder falling into the feed trough is ground more efficiently by the two-stage grinding roller, and the grinding efficiency of the grinding disc for new materials is also higher. Even if more and larger materials are continuously added, the grinding disc and the two-stage grinding box can still maintain a high grinding efficiency, thereby increasing the overall efficiency of the equipment.

The invention discloses a mining main fan high-speed permanent magnet motor based on a magnetic suspension technology, and relates to the technical field of permanent magnet motors, and the mining main fan high-speed permanent magnet motor comprises a housing, a main shaft which penetrates through the interior of the housing and extends to the outer side of the housing, and an intelligent control system, a magnetic suspension bearing used for fixing the main shaft is fixedly arranged on the inner wall of the penetrating groove, and a water cooling mechanism used for cooling the magnetic suspension bearing is fixedly arranged on the outer side surface of the machine shell. The intelligent control system comprises a data acquisition unit, a balance analysis unit, a balance control unit and a temperature control unit; an existing mechanical bearing is replaced by the magnetic suspension bearing, the magnetic suspension bearing comprises the moving ring and the magnet inner ring which are oppositely arranged, the magnetic polarities of the opposite working faces of the moving ring and the magnet inner ring are the same, and the moving ring can be in a complete suspension state relative to the magnet inner ring under the action of magnetic repulsive force; therefore, the main shaft and the drill are supported together in a suspended mode, and the requirement for high rotating speed of the main shaft is met.

The utility model provides a hub shield, a fan blade and a vehicle, the hub shield is used for being installed in a hub of the fan blade, the hub shield comprises a shield body, the inner peripheral wall of the shield body is in the shape of a circular truncated cone, and the end, with the larger diameter, of the inner peripheral wall is located at the end, provided with an opening, of the hub. According to the hub protective cover, the inner peripheral wall of the protective cover body is arranged to be in the shape of the circular truncated cone, after the protective cover body is installed on a fan blade, the end, with the larger diameter, of the inner peripheral wall is located at the end, with the opening, of the hub, and in the rotating process of the fan blade, soil, sand, dust and other sundries entering the hub are prevented from entering the hub under the action of centrifugal force; the fan blade protective cover does not need to be manually cleaned, saves time and labor, can well prevent the fan blade from shaking in the operation process, prolongs the service life of the fan blade, can enhance the structural strength of a hub part, is applied to an engine cooling system of a vehicle, and can improve the driving and riding comfort.

This invention relates to the field of cementing equipment technology in oil extraction, specifically a casing centralizer for oil extraction cementing. It includes two identical centralizer mounting bases, a first centralizer mounting base and a second centralizer mounting base. Multiple inner constraint spring plates are distributed between the two bases and combined to form a cylindrical frame. Outer main spring plates are correspondingly located on the outer sides of the inner constraint spring plates. The centralizer also includes a curvature adjustment mechanism and wellbore inner diameter detection and control equipment. The curvature adjustment mechanism drives a sliding column via a hydraulic system, pulling a curvature adjustment rope to adjust the distance between the outer main spring plates and the inner constraint spring plates. This centralizer can dynamically adapt to the outer diameter according to the wellbore inner diameter, providing precise and stable adjustment. It reduces downhole movement friction and component wear, ensuring the casing remains centered, effectively improving cementing construction quality and equipment operational reliability, and adapting to complex and harsh downhole conditions.

The invention provides a method for designing vehicle adjustment based on tire rigidity, belongs to the technical field of vehicle adjustment, and can solve the problems that in an existing vehicle adjustment process, tire rigidity parameters need to be continuously adjusted during real vehicle testing, the testing process is complicated, the debugging period of vehicle and tire matching is long, and the testing efficiency is high. And the technical problems of vehicle deviation, noise and abnormal sound and tire abnormal wear are solved. According to the method for designing the vehicle adjustment and calibration based on the tire rigidity, the static rigidity and the dynamic rigidity of the tire under the conditions of different bearing loads and different inflation pressures are tested indoors, the working condition of the tire during actual use of the vehicle is simulated, tire rigidity data needed by vehicle adjustment and calibration are obtained, matching of the vehicle and the tire is achieved, and vehicle adjustment and calibration are completed. The method can be applied to the aspect of vehicle adjustment, the matching of the tire test condition and the real vehicle test condition is realized, and the debugging period of the matching of the vehicle and the tire is shortened.

The invention provides a machining and manufacturing method of an air cycle machine shell and an air cycle machine. The machining and manufacturing method comprises the steps that a turbine shell and an air compressor shell are fixedly connected into a whole according to the orientation in the using state; the first radial air bearing stator hole section arranged on the turbine shell is opposite to the second radial air bearing stator hole section arranged on the compressor shell; and a boring cutter penetrates from the first radial air bearing stator hole section to the second radial air bearing stator hole section in the axial direction of the first radial air bearing stator hole section, and the boring cutter is controlled to rotate so that the first radial air bearing stator hole section and the second radial air bearing stator hole section can be bored to the design size at a time. The coaxiality of the radial air suspension bearings at the two ends of the rotating shaft in the rotor system is greatly improved, so that the eccentricity of the rotating shaft is reduced, abnormal vibration and instability of the rotor are effectively prevented, and the probability that the air suspension bearings are abraded or damaged due to vibration and instability of the rotating shaft is reduced.