42results about How to "Reduce aftershocks" patented technology

The invention relates to a structure defect rapid nondestructive test apparatus under a high speed railway and a method thereof. A signal emission unit, a signal receiving unit, a giant magnetostrictive transducer and a hub-type vibration sensor are arranged on a track monitoring vehicle; an output terminal of a vibration control signal of a processor is connected with a signal input terminal of the giant magnetostrictive transducer through the signal emission unit, the signal output terminal of the hub-type vibration sensor is connected with the signal input terminal of the signal receiving unit, the signal output terminal of the signal receiving unit is connected with the signal input terminal of an analog-to-digital conversion system, the signal output terminal of the analog-to-digital conversion system is connected with a vibration reflection signal input terminal of the processor, when the hub-type vibration sensor detects the railway track on the track monitoring vehicle, the hub-type vibration sensor is rolled on a to-be-detected ballastless track plate and detects the vibration signal reflected by the to-be-detected ballastless track plate. The structure defect rapid nondestructive test apparatus does not require a coupling agent, and has the advantages of simple structure and strong environment adaptation, and can realize rapid structure defect scanning under ballastless track on the high speed railway.

The disclosed concrete structure chromatography imaging detection system comprises: a CPU connected by PCI bus, an A/D card, a signal processing card connected with the A/D card and an emission power, and receiving transducer array connected with an ultra-magnetostrictive rare-earth emission transducer. This invention is simple and well precise, and can real-time show the inner structure of concrete accurately.

The invention discloses an automatic feeding and assembling machine for an aluminum pad of an all-in-one machine core. According to the automatic feeding and assembling machine for the aluminum pad of the all-in-one machine core, an automatic feeding mechanism is used for feeding the aluminum pad in place, an industrial four-axis robot moves to the position above a material disc, a visual detection mechanism on the head carries out shooting and then absorbs the aluminum pad, the position of the aluminum pad is judged accurately, meanwhile, a wire body carries a workpiece on a working panel to an assembling position, an absorbing head structure is discharged and installed, and full automation of the assembling process is achieved. The industrial four-axis robot is started stably, and is high in acceleration, precise and low in complementary vibration, the beneficial effects of small assembling errors and high precision are achieved, the problem of great demands on labor is solved greatly, and the assembling efficiency and the assembling precision are improved. The automatic feeding and assembling machine is applicable to the field of optical lens assembling.

The invention relates to a sensor, in particular to a novel ultrasonic wave sensor which comprises a hollow metal outer case. One end of the metal outer case is covered by a matching layer in a sealing mode. The inner side of the matching layer is provided with piezoelectric bimorphs in parallel in a pasted mode. The piezoelectric bimorphs in parallel are formed in the mode that the two opposite electrode faces of the two piezoelectric bimorphs are respectively pasted on two faces of a metal substrate, the other two electrode faces of the two piezoelectric bimorphs are electrically connected, and a common connecting end of the two piezoelectric bimorphs and the metal substrate are respectively connected with a connecting terminal. The novel ultrasonic wave sensor is simple in structure, high in sensitivity, and small in aftershock.

The invention provides a silicon foaming adhesive composition, by taking the total mass of the silicon foaming adhesive composition as a reference, the silicon foaming adhesive composition has the following ingredients: 50-75% of polydimethylsiloxane, 15-40% of dimethicone, 5-20% of silica micropowder, 0.5-2% of silicone resin, 1-10% of coupling agent, 0.5-3% of 4,4'-oxydibenzenesulfonyl hydrazide, 0.5-3% of crystalline hydrate. The invention also provides a preparation method of the silicon foaming adhesive composition, a silicon foaming adhesive prepared by the silicon foaming adhesive composition and an ultrasonic sensor containing the silicon foaming adhesive. The silicon foaming adhesive has large porosity and uniform aperture distribution, the ultrasonic sensor by using the silicon foaming adhesive has the advantages of small aftershock and low impedance.

The invention relates to the technical field of motors, in particular to a motor braking signal generation method, device and system, a medium and a motor braking method. The motor braking signal generation method comprises the steps: obtaining a first driving signal; obtaining a first feedback signal fed back by the motor according to the first driving signal, wherein the first driving signal andthe first feedback signal meet preset conditions; intercepting a section of first feedback signal after the first driving signal is ended; generating a braking signal according to the intercepted section of first feedback signal; and synthesizing a motor braking signal according to the first driving signal and the braking signal. The scheme has the advantages that the residual vibration of the motor can be accurately reduced and the scheme is simple.

The invention discloses a hardware circuit of a crosstalk-free ultrasonic ranging system, which is suitable for the field of ultrasonic ranging. The circuit is composed of a transmitting circuit, a detecting circuit, a filtering circuit, a transmitting and receiving switch control circuit, a real-time data storage circuit and a historical data storage circuit. The circuit has long measurement distance, small blind area, small distortion of measurement signal, high precision, large dynamic range, stable echo signal, and small aftershock. The number of aftershocks can be adjusted according to the needs of theoretical research, which is convenient for encoding and transmitting signals. modulation.

The invention belongs to the field of ultrasonic range finding and particularly relates to an ultrasonic range finding obstacle avoidance system, comprising a control processing unit, a serial port circuit, a power management module, a multichannel ultrasonic transceiver circuit and a CAN transceiver circuit, wherein the control processing unit is connected with the ultrasonic transceiver circuit,the serial port circuit, the power management module, and the CAN transceiver circuit; the power management module is used for supplying power to the ultrasonic transceiver circuit, the CAN transceiver circuit, and the control processing unit; the control processing unit is configured to communicate with a main control system and to control the operation of each module; the ultrasonic transceivercircuit is used for detecting an obstacle and measuring a distance; an isolation transformer drives a ultrasonic transmission circuit to match an adaptive transmission pulse control algorithm, so that the detection distance of the ultrasonic range finding obstacle avoidance system is increased, a transducer is driven by ultra-high voltage, and the power for transmitting ultrasonic waves is sufficiently large, thereby achieving higher detection sensitivity than that of a conventional driving method.

The invention discloses an ultrasonic sensor including a housing and a piezoelectric crystal plate disposed in the housing. A pedestal is mounted on one end of the housing. One side of the piezoelectric crystal plate facing towards the pedestal is provided with flexible adhesive fixedly while the other side is provided with a matching layer fixedly. The paste-shaped matching layer subjected to stirring is fixed on the piezoelectric crystal plate through adhesive dispensing or adhesive brush coating and the matching layer is in clearance-free bonding with the surface of the piezoelectric crystal plate. Then through heating, the material of the matching layer is cured fully, so that the matching layer and the piezoelectric crystal plate are integrated together. According to the invention, residual oscillation is reduced substantially and measurement dead zone is reduced. Through the method of bonding the material of the matching layer and the crystal plate integrally, the echo flexibility is improved. The ultrasonic sensor is simple in structure, low in cost increase and substantially improved in performance.

The invention discloses a wrapping assembly device. The wrapping assembly device comprises a rack, a raw material containing mechanism, a feeding mechanism, a locating mechanism, a wrapping mechanism and a discharging mechanism. The raw material containing mechanism is mounted on the rack and used for arranging and containing products to be wrapped. The feeding mechanism is mounted on the rack and used for moving the products to be wrapped to the set position. The locating mechanism is mounted on the rack and used for locating the products to be wrapped secondarily. The feeding mechanism moves the products to the wrapped to the locating mechanism from the raw material containing mechanism. The wrapping mechanism is mounted on the rack and wrapping the products to be wrapped. The feeding mechanism moves the products to be wrapped to the wrapping mechanism from the locating mechanism. The discharging mechanism is mounted on the rack and used for moving the finished products wrapped through the wrapping mechanism out. By the adoption of the wrapping assembly device of the structure, the products to be wrapped can be subjected to the automated wrapping work of the products to be wrapped (at the moment, parts of wrapping objects adhere to the products to be wrapped), manual alignment is not needed, and pollution to the products is reduced.

The invention discloses an integrated all-carbon fiber hub. The integrated all-carbon fiber hub comprises a carbon fiber material rim (5), a spoke upper shell (2) and a spoke lower shell (3) are integrated in the rim, the spoke upper shell (2) and the spoke lower shell (3) are assembled with each other and made of carbon fibers, wherein the spoke upper shell is composed of at least two arrayed upper shell hub strips and a structure with an upper shell groove, and the upper shell hub strips are erected by spoke upper shell assemblies (21) of Z-shaped structures on the left and right in an embedded mode; and the spoke lower shell is composed of at least two arrayed lower shell hub strips and a structure with an lower shell groove, and the lower shell hub strips are erected by spoke lower shell assemblies (31) of Z-shaped structures on the left and right in an embedded mode. The hub adopts carbon fiber materials in overall, and a spoke is of a hollow structure, so that the entire hub has high strength and reduces the weight to a minimum at the same time. The production time of the hub is effectively reduced, and the driving safety is greatly improved.

The invention provides a loudspeaker for reducing the vibration wave of a vibrating diaphragm. The loudspeaker comprises a framework, a flexible vibrating diaphragm in the form of a thin-shaped object arranged on the framework, a flexible suspension edge made of the same material with that of the vibrating diaphragm or different materials from those of the vibrating diaphragm, and at least one damping material layer made of high-damping and low-elastic-modulus materials. The inner peripheral edge of the suspension edge is connected to the vibrating diaphragm, and the outer peripheral edge of the suspension edge is connected to the framework. The damping material layer is arranged along the periphery of the suspension edge and is attached to at least one surface of the suspension edge. The inner side edge of the damping material layer is kept at a certain spacing from the inner periphery of the suspension edge. The damping material layer is attached to at least one surface of the suspension edge in the mass symmetric manner. According to the invention, at least one surface of the suspension edge of the vibrating diaphragm is provided with the damping material layer, so that the vibration energy transmitted to the suspension edge can be eliminated. Meanwhile, the generation of residual vibration waves is reduced, and the sound quality of the loudspeaker is improved.

The invention provides an air coupling ultrasonic transducer for non-contact detection of insulation defects of a switch cabinet. The air coupling ultrasonic transducer comprises a flexible glue backing, a piezoelectric wafer and a matching layer which are coaxially arranged from inside to outside, the matching layer adopts a multi-layer matching sub-layer structure, the outer surface of the matching layer is provided with a protective film, the inner surface of the matching layer is provided with a groove, and one end of the piezoelectric wafer is embedded into the groove; the piezoelectric wafer is connected with the flexible glue backing through a first electrode and connected with the matching layer through a second electrode. According to the air coupling ultrasonic transducer probe, optimization design is carried out on the air coupling ultrasonic transducer probe, the reliability, the sensitivity and the sound wave conversion efficiency of the air coupling ultrasonic transducer are improved based on the optimization design of the matching layer and the matching circuit, and the sensitivity and the measurement precision of the air coupling ultrasonic transducer in the aspect of high-voltage switch cabinet detection are achieved.

The invention discloses a method for reducing residual vibration of an ultrasonic sensor, an ultrasonic chip and an ultrasonic device.The method for reducing the residual vibration of the ultrasonic sensor can adopt a first scheme or a second scheme, the first scheme comprises the following steps that S1, an AD module is used for sampling amplitudes of n sampling points of the residual vibration of the ultrasonic sensor for the first time, and n is a natural number; then outputting voltage values with the same amplitude but opposite phases by using a DA module to offset and compensate the n sampling points of the first time; s2, sampling amplitudes of n sampling points for the second time by using the AD module, and then outputting voltage values with the same amplitude but opposite phases by using the DA module again to offset and compensate; s3, repeating the steps S1 and S2 until the residual vibration value is within a required range; according to the second scheme, after ADC sampling, the DAC is directly controlled to output signals with the same value but opposite phases to the ultrasonic sensor. According to the invention, the residual vibration can be obviously reduced, and the jump is obviously reduced.

The invention provides a tactile feedback conversion method and device, an electronic terminal and a computer readable storage medium, the tactile feedback conversion method is applied to an application A which is interrupted by an application B which also needs to generate tactile feedback when tactile feedback occurs, and the tactile feedback conversion method comprises the following steps: adjusting vibration issuing of the application A, reducing the amplitude of the application A from the current amplitude to zero amplitude within a first preset time; and meanwhile, adjusting vibration issuing of the application B, so that the amplitude of the application B is increased to the amplitude required by the application B from the zero amplitude within a second preset time. According to theinvention, the aftershock of the motor is reduced, a clear and comfortable vibration hand feeling is brought to a user, the use experience of the user is improved, the fluency during tactile feedbackconversion is ensured, the motor does not quickly reach a full-amplitude state after being quickly stopped, and the crust breaking phenomenon of the motor is effectively reduced.