9results about How to "Avoid resonance phenomenon" patented technology

The utility model is applicable to the field of radio frequency filtering, and discloses a resonator, a filter and a radio frequency front-end module, the resonator comprises a piezoelectric substrate and an interdigital transducer, and the interdigital transducer comprises a first bus bar and a second bus bar which are oppositely arranged along a first direction; the at least one first electrode finger, the at least one second electrode finger and the at least one suspension electrode are located between the first bus bar and the second bus bar, the first electrode fingers, the suspension electrodes and the second electrode fingers are arranged at intervals in the second direction, and the first electrode fingers and the second electrode fingers are arranged in a staggered mode in the second direction; in the second direction, the suspension electrodes and the main body parts of the first electrode fingers are alternately arranged and mutually overlapped to form a first resonance unit, and the suspension electrodes and the main body parts of the second electrode fingers are alternately arranged and mutually overlapped to form a second resonance unit. According to the resonator, the layout area can be reduced, and the performance of the resonator can be improved.

The invention relates to the technical field of seismic mitigation and isolation, and discloses a building high-damping magneto-rheological seismic isolation device which comprises a bottom plate, a vertical seat, a main plate and a reset column, through grooves are formed in the two sides of the upper surface of the bottom plate, and two sleeve blocks are slidably clamped in the through grooves. According to the high-damping magneto-rheological shock insulation device for the building, the rigidity and damping of the shock insulation support are controlled by changing the size of a magnetic field, the resonance phenomenon is effectively avoided, meanwhile, when a sliding block moves downwards, a third gear is driven to rotate, meanwhile, the third gear can drive a second gear to rotate, and therefore the shock insulation effect is improved. When a sliding block moves, a rack can carry a sleeve block to synchronously move, a reset spring is driven to stretch, the pulling force of the reset spring is applied to the sleeve block, the rack is driven to move, and a multi-buffering and damping mechanism and multi-stage buffering and damping are achieved. And the vibration can be counteracted through the reset spring and the first magneto-rheological damper, so that different types of vibration are adapted, and the vibration isolation effect is achieved.

The utility model provides a kind of rehabilitation nursing vibration recuperation bed, including chassis, a layer of rubber pad is laid above the chassis, multiple independent bed boards are laid above the rubber pad;The space for installing vibration plate is equipped in the chassis, vibrator is installed in the central position above vibration plate, there is a side plate in each side above vibration plate, there is an arc plate for supporting cross bar above side plate;Through hole for transmission plate is passed through is formed in one side of cross bar, embedding slot for transmission plate is embedded in the other side of cross bar, opening for transmission plate is also formed in the inside of each bed board, and is passed through bed board inside opening to be connected by transmission plate to pass into the through hole and embedding slot of cross bar.This structure design makes it possible to selectively connect certain bed board with vibration plate, so as to accurately transmit vibration to specific bed board.

The invention provides a few-leaf-spring suspension system for a sightseeing vehicle, and belongs to the technical field of vehicle suspension parts, the few-leaf-spring suspension system for the sightseeing vehicle comprises a main steel plate spring assembly, an auxiliary steel plate spring assembly, a fixing assembly, an anti-loosening assembly and a damping vibration attenuation assembly; a variable cross-section section is arranged in the middle of the main steel plate spring assembly, and the thickness of the variable cross-section section is gradually reduced from the center to the two ends; the length of the auxiliary steel plate spring assembly is smaller than that of the main steel plate spring assembly, and the auxiliary steel plate spring assembly is fixedly connected with the main steel plate spring assembly through a center bolt. The fixing assemblies are arranged at the two ends of the main steel plate spring assembly, and the anti-loosening assemblies are arranged in the fixing assemblies. The damping vibration attenuation assembly comprises a high-frequency damper, a medium-frequency damper and a low-frequency damper; the problem that in the prior art, a few-leaf-spring suspension system of a sightseeing vehicle is insufficient in vibration reduction performance can be solved.

The invention discloses a method and a system for designing and optimizing an anti-interference common-mode filter of an infrared sensor. The method comprises the steps of winding a Rogowski coil, calculating a relation between output voltage and a current change rate, and calculating parameters of the Rogowski coil. Calculating the relation between the integrating circuit output voltage and the common-mode current, and setting integrating circuit parameters. And setting in-phase amplifier parameters to obtain a common-mode transformer circuit transfer function. Common-mode transformer circuit parameters are designed, and the winding turn ratio is calculated. According to the infrared sensor anti-interference common-mode filter design and optimization method and system provided by the invention, by optimizing the Rogowski coil and the integral circuit design, external common-mode interference signals are effectively filtered out, and accurate transmission of the signals is ensured. A parameterization design method is adopted, the circuit design and adjustment process is simplified, and scientific researchers can conduct experiments and optimization more conveniently. By optimizing the high-frequency band design, the resonance phenomenon is avoided, the measurement bandwidth of the Rogowski coil is remarkably expanded, and the application range of the system is widened.

This utility model discloses a railway sleeper production pouring and vibrating device in the field of pouring and vibrating device technology. It includes a railway sleeper pouring mold, a movable vehicle on top of the mold, and a pouring and vibrating assembly inside the movable vehicle. The pouring and vibrating assembly includes a lifting base plate, limit slots on both sides of the lifting base plate, a pouring vibrator at the bottom of the lifting base plate, and a pouring vibrator rod at the bottom of the vibrator. Connecting seats are installed at the four inner corners of the lifting base plate and the vibrator. In this railway sleeper pouring and vibrating device, when the lifting base plate lowers the pouring vibrator rod into the railway sleeper pouring mold, the vibration generated by the electrically powered pouring vibrator rod can fully compact the concrete inside the mold. With the help of the horizontal displacement function of the movable vehicle, the pouring vibrator rod can uniformly compact the concrete at different locations within the mold, effectively improving the uniformity of concrete density and enabling mass production of railway sleepers.

The utility model discloses a food processing machine with a good damping effect, which relates to the field of life electric appliances and comprises a machine base internally provided with a motor and a smashing cup detachably arranged on the machine base, a smashing device in transmission connection with the motor is arranged in the smashing cup, and a water tank communicated with the smashing cup is further arranged on the machine base. The machine base comprises a machine shell, a mounting part is arranged on the inner wall of the machine shell, the water pump is further sleeved with a flexible part, and the water pump is fixed to the mounting part through the flexible part, so that vibration generated in the working process of the water pump is effectively absorbed, transmission of the vibration to the mounting part is effectively reduced, and then vibration of the whole machine shell is reduced; the resonance phenomenon in the working process is avoided, the stability of machine operation is improved, meanwhile, flexible isolation of the water pump and the machine shell is achieved through the flexible piece, and therefore the situation that the water pump directly collides with the installation part to generate collision noise when working is effectively avoided, noise reduction is achieved, and the noise reduction effect is improved.

The water dispenser comprises a cabinet body, a waterway board arranged on the cabinet body and a sound insulation cover arranged on the outer side of the waterway board in a covering mode, the waterway board is provided with a water inlet pipeline, a water outlet pipeline, a functional part and a wire electrically connected with the functional part, and the water dispenser further comprises a sound insulation part arranged on the sound insulation cover. The sound insulation piece is of a structure made of a flexible material; the sound insulation piece is provided with a first sound insulation part and / or a second sound insulation part, the water inlet pipeline and the water outlet pipeline penetrate out of the sound insulation cover through the first sound insulation part, and the wire penetrates out of the sound insulation cover through the second sound insulation part. The vibration absorption effect can be achieved on the water inlet pipeline, the water outlet pipeline and / or the wire through the flexible characteristic of the sound insulation part, corresponding vibration is prevented from being transmitted to other parts connected with the water inlet pipeline, the water outlet pipeline and the wire through the water inlet pipeline, the water outlet pipeline and the wire, the resonance phenomenon is avoided, and noise reduction is achieved.

This invention belongs to the field of power equipment technology, and particularly relates to a towable mobile protective assembly, comprising: a base with lifting lugs on its side walls and a set of wheels on its bottom; a protective box mounted on the base; and an internal circulation mechanism housed within the protective box for internal air circulation and heat dissipation of the high and low voltage switchgear. The base has a hollow structure, and a lightweight support unit is installed inside. This internal circulation heat dissipation mode prevents external air from directly entering the equipment, effectively preventing contamination from dust, moisture, and other impurities. The lightweight support unit of the base effectively reduces the burden of movement.