20 results about "Vibration transmissibility" patented technology

The invention discloses an optical thermostat with comprehensive vibration reduction and low-temperature in-situ displacement functions, which adopts upper and lower opposite vibration absorbers and a large-mass base to realize first-order to second-order inertial vibration absorption, and further realizes thorough decoupling with an optical platform in a suspension type non-contact manner, and the vibration transmissibility can be reduced to be less than 10%. Resonant frequencies of two systems (a sample table system and a cold head system) are designed to achieve vibration decoupling. The technical problems that in the prior art, the high-grade vibration isolation capacity is insufficient, refrigerator noise is easily coupled to a measuring light path, the low-temperature in-situ precision displacement capacity is lacked, and the contradiction between heat isolation, convenience and cost is difficult to balance can be solved. Under the support of a conventional GM refrigerator, the comprehensive requirements of ultralow basic vibration, strong decoupling of a measurement light path, low-temperature in-situ micron-sized displacement, convenient sample replacement and efficient refrigeration / thermal control are met at the same time.

The present disclosure relates to a tactile presentation device that includes a tactile presentation knob placed on an operation screen and for presenting a tactile sense to a user via the tactile presentation knob. The tactile presentation knob includes a conductive elastic portion that includes a surface layer facing the operation screen and an inner layer located on the side opposite to the operation screen, and an operation part that fixes the conductive elastic portion. The surface layer is set to be subjected to greater shear deformation than the inner layer by an operation of the tactile presentation knob, to generate vibrations by a change in the frictional force, and to be subjected to greater compressive deformation than the inner layer by a press of the tactile presentation knob. The inner layer is set to have higher vibration transmissibility than the surface layer.

The utility model relates to the technical field of servo driver vibration prevention, and particularly discloses a vibration prevention device of a servo driver, which comprises a driver body, a vibration prevention assembly is arranged below the driver body, an installation assembly is arranged on the outer wall of the vibration prevention assembly, and the vibration prevention assembly comprises a polyurethane foam layer. A metal honeycomb plate is arranged at the lower end of the polyurethane foam layer, a silica gel damping pad is arranged at the lower end of the metal honeycomb plate, the mounting assembly comprises an upper supporting frame and a lower supporting frame which are of a U-shaped structure, and vertical plates are fixedly connected to the left end and the right end of the polyurethane foam layer and the left end and the right end of the silica gel damping pad correspondingly. And rectangular grooves are formed in the outer walls of the multiple vertical plates, through a composite damping assembly composed of a polyurethane foam layer, a polyurethane foam layer and a silica gel damping pad, the vibration transmissibility can be reduced, and precise electronic elements are protected.

This invention relates to a full-frequency vibration reduction design method for metamaterial pipelines based on multiple band gaps, comprising: establishing an equivalent mechanical model of the target pipeline; periodically arranging elastic supports on the target pipeline to induce the formation of a zero-frequency band gap and a Bragg band gap, coupling the equivalent support stiffness of the elastic supports with the equivalent mechanical model of the pipeline to construct a first band gap calculation model; periodically arranging local resonant vibration absorbers on the target pipeline to form a local resonant band gap, coupling the equivalent stiffness and equivalent mass of the local resonant vibration absorbers into the first band gap calculation model to obtain a second band gap calculation model; constructing a system finite structure dynamic vibration calculation model with a second assembly as the analysis object; constructing a vibration transmissibility index, and using the system finite structure dynamic vibration calculation model as a fitness evaluation tool for a genetic algorithm to perform non-periodic optimization of the elastic support positions, solving for the optimal arrangement position of the elastic supports with the largest bandwidth of the zero-frequency band gap.

The invention relates to the technical field of fascia guns, in particular to a silicone rubber ring damping system of a fascia gun and a damping effect calculation method.The silicone rubber ring damping effect calculation method of the fascia gun comprises the steps that the eccentric distance of a crank and the length of a connecting rod are determined, and the eccentric distance of the crank and the length of the connecting rod serve as fixed values; the damping ratio and the collision frequency ratio of the silicone rubber ring are variables, the vibration transmissibility after the silicone rubber ring is installed is calculated through a transmissibility formula in a single-degree-of-freedom system, and then the damping effect of the silicone rubber ring is calculated. The noise problem of the fascia gun in the prior art and the problem of quantitative calculation of the damping effect of the silicone rubber ring of the fascia gun are effectively solved.

The invention discloses a multimodal transport logistics device and a control method thereof, the device comprises a logistics device body and an intelligent control module, the logistics device body comprises an intelligent lock catch mechanism, an auxiliary loading and unloading mechanism, a vibration damping and buffering system and an intelligent monitoring module; the intelligent lock catch mechanism determines motor output parameters through a torque matching method to complete rapid locking and unlocking; the auxiliary loading and unloading mechanism adapts to loading and unloading requirements of different gradients and cargo mass through a thrust calculation model; the vibration damping and buffering system reduces the vibration transmissibility through the optimal design of the inherent frequency and the damping ratio. According to the invention, the locking and unlocking efficiency, the loading and unloading stability and the vibration protection capability are improved, the cargo transportation safety is guaranteed, and the efficient and large-scale development of multimodal transportation is assisted.

The application provides a shell radiation noise evaluation method and device and electronic equipment. The method comprises the following steps: obtaining a modal vibration mode of a shell structure; determining a plurality of measurement points of the shell structure based on a modal vibration region of the modal vibration mode; determining vibration transmissibility data of each measurement point through a vibration sensor when each measurement point is tapped; determining vibration overall radiation energy of the shell structure based on the vibration transmissibility data of the plurality of measurement points, and determining shell radiation noise of the shell structure based on the vibration overall radiation energy. In this way, the shell radiation noise level in the actual operation process of the shell structure can be effectively predicted by carrying out tapping test on the measurement points of different parts of the shell structure to obtain the vibration transmissibility data without running test on the electric drive bench, so that the NVH performance of the electric drive product and the comfort of the new energy vehicle are improved.

This utility model discloses a vibration-damping and noise-reducing silent heat sink, including a heat sink assembly, a fan, and a base plate. It also includes a vibration-damping connector and a flow guide shroud. The vibration-damping connector is made of an elastic material and has a ring-shaped structure, nested between the fan and the flow guide shroud. The flow guide shroud surrounds the air outlet side of the fan, and its inner wall has a spiral flow guide groove. The heat sink assembly includes multiple wavy, non-equidistantly arranged heat dissipation fins, forming a gradually expanding airflow channel. The bottom of the base plate has a honeycomb-shaped vibration-damping cavity filled with damping adhesive. The three-stage vibration-damping structure significantly reduces vibration transmission rate, reduces resonance, and extends equipment life. The spiral flow guide groove, sound-absorbing grille, and wavy fin phase difference design significantly reduce wind noise and structural noise.

The present application belongs to the technical field of air suspension, and provides a vehicle air suspension damping effect determination method, system and application, comprising synchronously acquiring input acceleration and output acceleration of a vehicle air suspension under simulated road excitation; based on the input acceleration and the output acceleration, calculating a vibration transmission rate and performing frequency domain analysis to obtain a frequency domain transmission rate curve representing the damping effect of the air suspension; based on the frequency domain transmission rate curve, establishing a quantitative criterion for guiding design, the quantitative criterion comprising full-working-condition adaptability, parameter correlation and performance consistency; based on a quantitative mapping relationship between key parameters of the air suspension and a change amount of the vibration transmission rate at a characteristic frequency constructed according to the parameter correlation quantitative criterion, an optimization strategy of the key parameters of the air suspension is determined with the vibration transmission rate of a target frequency band as the optimization direction. The present application can accurately evaluate the energy filtering efficiency between road input and vehicle body response of the air suspension.

This application provides a vehicle seat analysis method, apparatus, electronic device, and storage medium. The method includes: establishing a first finite element model of the vehicle seat; inputting an excitation load into a first virtual excitation point to obtain first vibration information generated by a first virtual response point; obtaining a first vibration transmissibility of the first seat finite element model based on the first vibration information; establishing a vehicle floor and setting an elastic connection between the vehicle floor and the first seat finite element model to obtain a second seat finite element model; inputting an excitation load into a second virtual excitation point to obtain second vibration information generated by a second virtual response point; obtaining a second vibration transmissibility of the second seat finite element model based on the second vibration information; and obtaining vibration comfort analysis results based on the first and second vibration transmissibility. This application can accurately analyze the vibration comfort of vehicle seats and can reduce the vibration analysis cost of vehicle seats.

The invention discloses a tuned mass damping system for improving the specific frequency dynamic stiffness of an anti-microvibration base, and belongs to the technical field of vibration control. Comprising an independent modularized shell, a top cover, a mass block, a steel plate spring, a frequency adjusting mechanism, a guide structure, a damping assembly and an installation structure, the frequency adjusting mechanism drives a sliding block through a rotary knob and a lead screw to change the effective working width of the steel plate spring, continuous adjustment of the inherent frequency is achieved, the frequency is visually displayed through an instrument, and stability is guaranteed through a locking structure; the guide structure restrains the mass block to move only in the main vibration direction, and damping of the damping assembly is adjusted through a replaceable damping pad. The tuning method comprises the steps of frequency calibration, target frequency determination, frequency tuning, damping optimization and operation verification, and accurate parameter matching is realized based on a frequency sweep test. The device can be tuned on site, can be used after being installed, is adaptive to various controlled structures, can directionally improve the specific frequency dynamic stiffness, reduces the vibration transmissibility, gives consideration to the dynamic performance and the vibration suppression effect, and is reliable in stability.

The present disclosure relates to a tactile presentation device that includes a tactile presentation knob placed on an operation screen and for presenting a tactile sense to a user via the tactile presentation knob. The tactile presentation knob includes a conductive elastic portion that includes a surface layer facing the operation screen and an inner layer located on the side opposite to the operation screen, and an operation part that fixes the conductive elastic portion. The surface layer is set to be subjected to greater shear deformation than the inner layer by an operation of the tactile presentation knob, to generate vibrations by a change in the frictional force, and to be subjected to greater compressive deformation than the inner layer by a press of the tactile presentation knob. The inner layer is set to have higher vibration transmissibility than the surface layer.

This invention relates to the field of diesel generators, and in particular to a quiet diesel generator, comprising a chassis unit, a power generation unit mounted on the chassis unit, a sound-absorbing unit mounted on the chassis unit, and a docking unit between the chassis unit and the power generation unit. This invention forms a double-layer common chassis by placing a wire rope vibration isolator and an air spring between the upper and lower base layers, reducing the vibration transmission rate of the diesel generator to the ground during operation and blocking the propagation of engine vibration to the foundation and building structure. Simultaneously, through the installation of a closed enclosure and a hollow layer, an integrated sound-absorbing and sound-insulating cavity is created outside the generator and diesel engine, reducing the noise transmitted by the diesel generator to the outside, enabling the equipment to meet the usage requirements of noise-sensitive areas such as hospitals and residences. This invention also utilizes the fault tolerance capability of the worm gear and gear-driven generator coupling assembly to achieve rapid alignment and periodic adjustment of the generator and diesel engine.

The invention relates to the technical field of flywheel energy storage equipment, in particular to a flywheel energy storage unit base which comprises a supporting seat body, and a flywheel unit mounting plate for mounting a flywheel unit is arranged above the top end of the outer wall of the supporting seat body. A fixing mechanism fixed to a flywheel unit mounting plate is arranged at the top end of the outer wall of the supporting seat body, a damping mechanism for buffering and damping is arranged on the fixing mechanism, and a leveling mechanism used for leveling the fixing mechanism is arranged on the supporting seat body. And the fixing structure is used for fixing the supporting seat body on a mounting foundation. The problems that an existing base is not provided with a special damping and buffering structure, or only a single rubber pad is adopted for damping, broadband vibration generated by high-speed rotation of a flywheel cannot be effectively absorbed, the vibration transmissibility is high, the unit operation noise is large, vibration is easily transmitted to a ground foundation, and normal work of peripheral equipment is affected are solved.

The present application relates to the field of textile machinery and damping control, specifically to a warp knitting machine high-stability bearing seat and a method thereof; comprising a bearing main frame, a damping energy dissipation core, a leveling support foot, a spherical self-adaptive pad, a monitoring part and a controller; the system obtains top and bottom end vibration data in real time through a sensor, calculates vibration transmission rate and attenuation rate and then solves dynamic stiffness, thereby evaluating damping aging state and calculating resonance critical speed; the core is to densely fill the damping energy dissipation core in the main frame to dissipate periodic excitation energy generated by high-speed operation, and to use spherical contact matching of the hemispherical protrusion at the bottom of the support foot and the hemispherical groove of the spherical self-adaptive pad, so that the support foot can be freely deflected to adaptively compensate uneven ground; the present application solves the problems of insufficient existing foundation stiffness and obvious high-frequency vibration transmission, effectively avoids long-term stress concentration and loose connection of the rack, and greatly improves the support stability.

The invention belongs to the field of precise active vibration reduction, and particularly discloses a fault diagnosis method and system of an active vibration reduction system. The method specifically comprises the steps of obtaining a frequency response curve of related vibration transmissibility based on a kinetic equation of an active vibration reduction system; and performing fault diagnosis on related parts in the active vibration reduction system by adopting the frequency response curve of the related vibration transmissibility. According to the method, the fault points of the key actuator and the sensor in the active vibration reduction system can be quickly judged.

The invention discloses a reliability optimization design method of a multi-connecting-rod impact isolator under impact excitation, belongs to the technical field of impact isolation and vibration reduction of mechanical equipment, is used for reliability optimization design of the multi-connecting-rod impact isolator, and comprises the following steps: establishing and solving a dynamic control equation of the multi-connecting-rod impact isolator; calculating a global sensitivity index influencing the dynamic behavior parameter based on the failure probability of the vibration isolation performance, and extracting a sensitivity parameter; establishing a limit state function of the vibration isolation performance; based on the limit state function, establishing a Kriging agent model of the failure probability function; taking the high-frequency vibration average transmissibility as an objective function, establishing a normalized objective function considering the vibration isolation performance failure probability, and solving the normalized objective function by using a particle swarm algorithm; according to the method, the multi-connecting-rod impact isolator under impact excitation is analyzed, the vibration transmissibility of the vibration isolation device is reduced, the performance robustness of the vibration isolation device is improved, and the design parameters of the optimal vibration isolation performance are obtained under the constraint conditions of considering the performance reliability and dynamic behaviors of the vibration isolation device.

This invention relates to a method and system for testing the vibration isolation performance of a brake vacuum tube. The testing method involves setting an excitation point and a response point on the brake vacuum tube under test; applying excitation to the excitation point and obtaining the transfer function of the response point; and obtaining the comprehensive vibration transmissibility of the brake vacuum tube under test based on the transfer function, thereby determining the comprehensive vibration isolation performance of the brake vacuum tube. This invention also provides a testing system for the vibration isolation performance of a brake vacuum tube, including a testing platform, a first support and a second support thereon, a first slide rail on the first support, and a second slide rail on the second support; sensors are arranged at both ends of the brake vacuum tube under test, the sensors are connected to a data acquisition terminal, the data acquisition terminal is connected to a computer, and the data acquisition terminal is also connected to a hammer. By applying excitation to the brake vacuum tube under test, the corresponding transfer function is obtained. This invention can accurately evaluate the vibration isolation performance of brake vacuum tubes and provides a reliable reference for the design improvement of brake vacuum tubes.

The application discloses a reliability optimization design method of a multi-link shock isolator under impact excitation, belongs to the technical field of mechanical equipment shock isolation and vibration reduction, and is used for reliability optimization design of a multi-link shock isolator, and comprises the following steps: a dynamic control equation of the multi-link shock isolator is established and solved; global sensitivity index of a dynamic behavior parameter is calculated based on a failure probability of vibration isolation performance, and a sensitivity parameter is extracted; a limit state function of the vibration isolation performance is established; a Kriging surrogate model of the failure probability function is established based on the limit state function; a normalized target function considering the failure probability of the vibration isolation performance is established with high-frequency vibration average transmissibility as a target function; and the normalized target function is solved by using a particle swarm algorithm. The application can reduce the vibration transmissibility of the vibration isolation device, improve the performance robustness of the vibration isolation device, and obtain design parameters of optimal vibration isolation performance by analyzing the multi-link shock isolator under impact excitation and considering constraint conditions of the performance reliability and the dynamic behavior of the vibration isolation device.

The utility model discloses a low-vibration high-lift spiral constant-pressure pump, and belongs to the technical field of water pumps. Comprising two pump shells which are buckled oppositely and internally form a spiral mounting cavity, an impeller horizontally mounted in the spiral mounting cavity through a pump shaft, and a buffer base mounted at the bottom ends of the pump shells; the guide vanes at the water inlet can guide fluid to flow into the impeller at an axial uniform speed, inlet vortex loss is reduced, kinetic energy of the fluid is converted into pressure energy more efficiently, the guide ribs at the water outlet can reduce outlet pressure fluctuation, lift stability is improved, vibration excitation sources caused by fluid impact are reduced, and the service life of the impeller is prolonged. The bottom end of the spiral constant-pressure pump is connected with the buffer base, the vibration amplitude of the pump body is directly reduced, the vibration transmissibility is reduced, and the abnormal vibration risk is reduced; in short, the spiral constant pressure pump has the characteristics of low vibration and high lift, and is suitable for popularization.