27results about How to "Improve directivity" patented technology

The invention relates to the technical field of refrigerator refrigeration and defrosting, in particular to a refrigerator evaporator with a high-precision defrosting mechanism, which comprises an assembly frame body mounted on a refrigerator, and fins are fixedly mounted in the assembly frame body through a coil pipe. According to the refrigerator evaporator with the high-precision defrosting mechanism, a transverse flow guide pipe internally provided with a transverse flow fan is fixedly assembled in the assembly frame and located on one side of the fins, so that the air cooling uniformity of the evaporator is greatly improved, and the air cooling effect is improved; the air outlet is formed in the inner wall of the assembly frame and located on one side of the fins, the electric control type flow guide cover is installed in the air outlet, the refrigeration mode of the refrigerator can be changed according to needs, operability is improved, and application scenes are more diversified. The temperature sensor is installed on the electric control type flow guide cover, the electric heating film is installed on the inner wall of the air outlet of the transverse flow guide pipe, and the electric heating film is automatically started according to the temperature difference of different areas, so that air heating defrosting is accurately and directionally started, and energy waste caused by large-area defrosting is avoided.

The utility model discloses a sound guide rear seat of a condenser microphone and the condenser microphone, and particularly relates to the sound guide rear seat of the condenser microphone and the condenser microphone comprising the sound guide rear seat, the sound guide rear seat comprises a conical head, a base and two identical connecting parts, the conical head is a rotating body; the base is a hollow cylinder; the conical head and the base have the same rotating central axis; the first end of the base is connected with the conical head, and the second end of the base is connected with the two connecting parts. The condenser microphone is provided with the sound guide rear seat, so that the focusing and diffusion degree and direction of rear incoming sound can be changed, the frequency response characteristic of the condenser microphone can be improved, the directional characteristic can be optimized, the comb filtering effect and the sidelobe phenomenon can be inhibited, howling is reduced, and the condenser microphone has the advantages of simple structure, easiness in assembly, good acoustic performance and the like.

The application discloses a wearable split mobile computing and energy supply system based on dynamic resonance tracking and a dynamic wireless energy supply method thereof, relates to the technical field of mobile computing and wireless energy transmission, and aims to solve the problems of coupling deterioration and transmission efficiency reduction of a magnetic resonance wireless energy supply system in a receiving end motion. The system comprises a wearable host configured in a belt head form, which is internally integrated with a high-performance processing unit, a main transmitting coil unit, an adjustable matching network, a space perception module, a wireless energy supply control core, a mobile communication module, a short-distance wireless communication unit, a voice front end, a sensor unit and a touch display screen; a wearable belt internally contains a plurality of battery units to supply power to the host, and auxiliary transmitting coils are distributed on both sides of the belt to form a multi-array magnetic resonance transmitting coil array together with the main transmitting coil; and at least one interactive terminal is physically separated from the host and comprises a display unit, a magnetic resonance receiving coil, a rectification and voltage stabilization link, a buffer energy storage unit and a short-distance wireless communication module, and does not configure a main application processor. The wireless energy supply control core calculates the coupling state parameters of a magnetic resonance channel in real time based on the three-dimensional position and three-dimensional posture of the interactive terminal, generates frequency compensation instructions and power / phase distribution instructions, controls the adjustable matching network to dynamically adjust the working frequency to track the resonance point drift, controls the driving amplitude and phase of each unit of the multi-array coil array to form a directional energy beam, and realizes stable wireless energy supply in a dynamic scene.

The invention relates to the field of multi-robot cooperative scheduling, and discloses a multi-robot cooperative scheduling unmanned underground mechanical garage system and method, and the system comprises a hardware subsystem which comprises a transfer robot, a parking space frame, a vertical elevator, and an entrance and exit junction area; the control system is deployed in the central control server, and the control system comprises a multi-layer dynamic data grid generation module which is used for constructing a discretized data grid corresponding to a garage physical space; and the central data calculation module is used for continuously updating the data of each data layer in the multi-layer dynamic data grid according to the real-time state of the garage. In the regional congestion degree and traffic control layer, the congestion index is calculated according to the density, the speed variance and the dispersion in the movement direction of the transfer robot, and the task gravitation modulation coefficient is generated, so that the tendency of the robot to enter the crowded region is reduced, the adaptive dispersion of the traffic flow is promoted, and the continuity of garage operation is maintained.

The invention provides a directional diagram reconfigurable liquid transparent antenna applied to ocean communication. The antenna is composed of a hexagonal star-shaped radiation cavity, an inverted L-shaped feed probe and a liquid ground. Through design and processing, besides a feed structure, the whole antenna realizes full transparency, has a good optical stealth effect, and has more application scenes. By utilizing the liquidity of liquid, distilled water is injected into different cavities, and the electric field distribution of the radiation cavity is changed, so that different patterns are generated. The antenna can realize a reconfigurable function of a directional diagram at 2.22-2.63 GHz, has five states of directional diagram switching modes, namely + / -15 degrees, + / -35 degrees and 0 degree, has better impedance matching and radiation directivity, and has a good optical stealth effect due to the transparent appearance.

This utility model discloses a horizontal line array speaker, relating to the field of speaker technology. It includes a cabinet, inside which a first speaker and a second speaker are installed. The first speaker propagates sound outwards along a first outlet of the cabinet, and the second speaker propagates sound outwards along a second outlet. The sound waves emitted by the first speaker can cancel out the low-frequency sound waves from the side of the second speaker facing away from the second outlet, causing the low-frequency sound waves to primarily propagate towards the second outlet. This increases the concentration of sound wave propagation, effectively reducing the impact of ambient noise and thus increasing the sound wave energy on the side closer to the audience. The cabinet is equipped with a waveguide located on the side facing away from the first outlet. The waveguide can convert spherical waves into plane waves, which helps improve the directivity of the sound waves and saves space, allowing for a smaller cabinet size. The second outlet is equipped with a phase plug, which reduces the secondary reflection path of the sound waves, reduces bass looseness and resonance problems, makes the low frequencies tighter and more powerful, and enhances the sense of rhythm.

The utility model discloses a square small cross section longitudinal wave twin-crystal probe for ultrasonic detection of a base arc portion, which comprises a delay block, a sound insulation layer, a probe core, a sound absorption material and piezoelectric crystal plates which are arranged in a shell, the two piezoelectric crystal plates are square, the size of each piezoelectric crystal plate is 4 mm * 2 mm, and the total size is 4 mm * 4 mm. And the working frequency of the longitudinal wave twin-crystal probe is set to be 4MHz. The piezoelectric crystal plates are arranged to be square, the sizes of the two piezoelectric crystal plates are both 4 mm * 2 mm, the sound field directivity of the square piezoelectric crystal plates is better than that of a round piezoelectric crystal plate, the detection sensitivity is high, meanwhile, the piezoelectric crystal plates with small sections are adopted, the problem that coupling between the probe and the surface of a transition arc part of a machine base is poor can be solved, and the detection accuracy is improved. And the working frequency is controlled to be 2-6MHz, so that detection personnel can more accurately position and evaluate defects, and meanwhile, the detection sensitivity is improved.

The application discloses a quasi-zero stiffness vibration isolation and pointing integrated platform, which comprises a base platform, a working platform and a plurality of leg mechanisms with quasi-zero stiffness characteristics arranged between the base platform and the working platform, one end of the leg mechanism is connected with the base platform through a two-axis flexible hinge, and the other end of the leg mechanism is connected with the working platform through a three-axis flexible hinge, so that spatial six-degree-of-freedom wide-band vibration isolation and pointing control are realized. The application utilizes linear and nonlinear positive stiffness structures to compensate for negative stiffness structure design, designs passive quasi-zero stiffness structures and active quasi-zero stiffness structures, composites the passive quasi-zero stiffness structures and the active quasi-zero stiffness structures to form quasi-zero stiffness legs, the quasi-zero stiffness legs can bear large loads, the ideal balance position adjustment of the passive quasi-zero stiffness structures can be realized by translating the negative stiffness structures of the passive quasi-zero stiffness structures, the ideal balance position adjustment of the active quasi-zero stiffness structures can be realized by translating the nonlinear positive stiffness structures of the active quasi-zero stiffness structures and adjusting the current size, so that the leg length is adjustable, and the quasi-zero stiffness legs have the pointing function.

The application provides a marine rainstorm diagnosis method and system based on a multi-source remote sensing South China Sea summer monsoon index, relates to the meteorological monitoring technical field, and comprises the following steps: acquiring multi-source remote sensing data such as a South China Sea wind field, a temperature field and a humidity field, calculating a monsoon comprehensive index field, and performing time-space gradient analysis to identify an abnormal region. Based on the spatial position and evolution trend of the abnormal region, the intensity of kinetic energy input and thermal energy output is calculated respectively, and whether the energy budget is in a positive feedback enhancement state is determined by comparison. Finally, the rainstorm diagnosis result is generated by coupling the evolution path of the index field and the energy state, and more accurate and timely diagnosis and early warning of the South China Sea marine rainstorm are realized.

This application provides a sound amplification device based on M-H metamaterials and a sound propagation method utilizing them. The sound amplification device includes at least an upper shell, a lower shell, and a waveguide located between the upper and lower shells. The waveguide is made of Mie metamaterials. The waveguide includes an outer wall with multiple sound wave inlets. The upper shell, lower shell, and outer wall enclose and form a waveguide space. A through-hole is provided within the waveguide space, penetrating the waveguide and the upper shell, serving as the sound wave outlet in the sound amplification device. The waveguide includes multiple fan-shaped sections arranged circumferentially around the through-hole. A waveguide channel is formed between adjacent fan-shaped sections, connecting the sound wave outlet and the sound wave inlets. The control current of the sound source is determined by the size of the sound amplification device and the scattering distribution of the sound amplification device under different resonance modes. The sound energy level at the sound wave outlet is higher than that at the sound source, and the propagation direction has an angle. By determining the control current at the sound source that best matches the size of the sound amplification device, low-cost, high-precision, and widely applicable sound propagation control is achieved.

This invention discloses a strip defect detection light source and defect detection device. The strip defect detection light source includes a lamp bead, a first transmitting element, a second transmitting element, and a reflector. The first transmitting element includes a first light-inlet surface and a first light-outlet surface. The first light-inlet surface is convex, and the lamp bead is located at the focal point of the first light-inlet surface. The first light-outlet surface includes alternating first flat portions and first concave portions, with the concave portion of the first concave portion facing the centerline of the first light-outlet surface. The second transmitting element is fixed on both sides of the first transmitting element and surrounds the light-emitting side of the lamp bead. There are two reflectors, each fixed to one side of the two second transmitting elements away from the first transmitting element. This invention achieves directional refraction through the first concave portion, guiding the light from the central region of the light source to both sides in an orderly manner, effectively supplementing the light amount in the lateral regions, and achieving uniform light output across the entire area. At the same time, it maintains high directivity of the light throughout the process, avoiding interference from diffuse light with the imaging effect of defect detection.

The utility model provides a loudspeaker with an additional heat dissipation structure, which comprises a magnetic conduction carrying component, a magnetic force driving component, a magnetic conduction matching component, an excitation stress component, a vibration sound production component, a sound production guide component and a driving heat dissipation component. Meanwhile, unnecessary vibration interference is reduced, a guide space is formed by a guide outer cylinder and a guide end of the sound production guide component, sound produced by the vibrating diaphragm is guided, directivity and distribution uniformity of the sound are improved, the sound is transmitted more intensively, and a heat dissipation cover ring of the driving heat dissipation component is made of a heat conduction material, so that heat dissipation efficiency is improved. The heat dissipation cover ring is arranged on the outer wall of the magnetic force driving component and connected to the outside of the driving magnetic ring, heat generated by the magnetic force driving component in the working process is effectively dispersed and released, the heat dissipation area is further increased through the heat dissipation ring groove formed in the outer wall of the heat dissipation cover ring, the heat dissipation efficiency is improved, and the stability and reliability of the loudspeaker in the working process can be kept.

The invention relates to the technical field of display, and discloses a high-brightness backlight module and a vehicle-mounted display screen, and the high-brightness backlight module comprises a first prism light guide film, a second prism light guide film, a light guide plate and an LED light source assembly, the first prism light guide film and the second prism light guide film are sequentially arranged on the side where the light-emitting face of the light guide plate is located. A first microstructure is arranged on the light-emitting surface of the light guide plate, and a second microstructure is arranged on the reflecting surface of the light guide plate; a first prism sheet of the first prism light guide film is arranged back to the surface of the light guide plate; and a second prism sheet of the second prism light guide film is arranged opposite to the surface where the first prism sheet is located. According to the backlight module provided by the invention, the biprism light guide film is arranged on the light-emitting surface of the light guide plate, and the prismatic lenses of the biprism light guide film are back to the light guide plate, so that the light emitted from the light-emitting surface of the light guide plate is converted into the light emitted at 0 degree without energy loss, and the backlight module has relatively strong light collimation and high brightness.

The application relates to the technical field of semiconductors, in particular to a semiconductor device performance parameter automatic detection method, which comprises the following steps: obtaining an initial detection working interval of a semiconductor device; performing initial random sampling in the initial detection working interval to obtain an initial sampling point set; performing fitting processing on the initial sampling point set by using a Gaussian process regression algorithm to construct a proxy model; and performing analysis processing on the proxy model by using a batch Bayesian optimization algorithm. The asynchronous hardware pipeline capability of a source measurement unit is utilized to perform high-speed parallel sampling, the communication overhead between an upper computer and an instrument is reduced, parallel processing of calculation and measurement tasks is realized, and physical test time consumption is compressed. In this way, the accurate performance parameters can be quickly and safely converged by using far fewer measurement points than in a traditional scanning mode, so that the test efficiency and safety are improved under the premise of ensuring the accuracy.

The utility model relates to the field of coaxial mid-high pitch sound boxes, in particular to a coaxial cylindrical wave mid-high pitch sound box, which ensures coaxial transmission of sound by arranging a mid-low pitch unit, a high pitch unit and a high pitch horn on the same axis, and is favorable for forming a more consistent and clearer sound field. By arranging the high-pitch fixing frame, the stability of the structure is ensured, and the high-pitch unit can be installed and adjusted in position independently of the middle-low unit. Compared with a traditional design, the mode greatly simplifies the assembly process, and meanwhile, the flexibility is also improved. By arranging the high-pitch horn, high-frequency sound waves are guided and diffused, the directivity and the coverage range of high-frequency sound are improved, and distortion is reduced. And unnecessary sound wave reflection and interference are reduced by arranging the diversion holes, so that the overall sound quality of the sound box is improved. The problems of poor independence between the alto unit and the high pitch unit and difficulty in position adjustment of the existing coaxial cylindrical wave alto-high pitch sound box are solved.

According to one embodiment of the utility model, the massage device is characterized by comprising a body massage part for accommodating at least one part of the body of a user and massaging the body of the user; an arm massage unit which is provided on a side portion of the body massage unit, accommodates an arm of a user, and performs a massage operation on the accommodated arm as a target; a rotation module that rotates the arm massage unit in one or more directions; the detection sensor is arranged on the arm massage part and is used for monitoring an object in a detection area; and a control unit that performs control so as to execute a detection subsequent mode using a detection signal input from the detection sensor. According to the massage device provided by the embodiment of the utility model, when a safety accident occurs or the safety accident is predicted to occur under the condition that a user cannot recognize the safety accident, a mode for realizing the safety of the user and the device or the convenience of the user is automatically driven, so that higher user directivity can be realized.

The present invention relates to the field of medical device technology, specifically to a standard path for the indwelling of a portable visual nasogastric feeding tube at the bedside of a patient with a severe, critical illness, or ICU, and a system for indwelling the tube, including a receiving display and a nasogastric tube, a control handle movably mounted on one side of the receiving display, an endoscope fixedly connected to one end of the control handle, and a wireless transmission device fixedly connected to the other end of the control handle, the wireless transmission device matching the receiving display; the present invention can significantly improve the success rate of indwelling tubes, greatly shorten the indwelling tube time, and significantly improve the work efficiency of doctors through a portable visual nasogastric tube indwelling device. From the patient's perspective, the indwelling tube time is shortened, various auxiliary operations are reduced, the incidence and risk of adverse events are reduced, and in particular, the fatal complications of critically ill patients caused by the indwelling of a feeding tube into the lungs are eliminated, the cost and radiation of filming are reduced, and the damage caused to patients by multiple indwelling tubes is reduced.

The application discloses a speech recognition method, device and equipment and a storage medium. The method comprises the following steps: performing encoding processing on speech feature data to obtain an encoded feature sequence; obtaining a first influence value and a second influence value of the feature sequence; wherein the first influence value represents a sentence granularity influence value, and the second influence value represents a speech frame granularity influence value; performing first decoding processing on the feature sequence combined with the first influence value to obtain a decoded first character sequence; performing masking processing on at least one character in the first character sequence based on a confidence value and the second influence value to obtain a mask sequence; performing second decoding processing on the feature sequence to obtain a decoded second character sequence; and obtaining a third character sequence as an output result of speech recognition based on the second character sequence and the mask sequence.

The utility model relates to the technical field of loudspeakers, and provides a loudspeaker and a vehicle, the loudspeaker comprises a sound production unit and a sound amplification structure, the sound production unit is used for emitting sound waves to the front; the sound amplification structure is located on the front side of the sound production unit, the sound amplification structure comprises a reflection panel used for reflecting the sound waves, and the plate surface of the reflection panel is parallel to the axial direction and the radial direction of the loudspeaker. And the sound amplification structure capable of reflecting sound waves is additionally arranged, so that the propagation range and the coverage area of sound are expanded. Through the design, the directivity and the distribution uniformity of the sound can be improved, and the coverage range of the audio in the vehicle is enlarged, so that the sound listening experience is improved. The airflow cavity in the design can effectively absorb interference of sound waves, and the problems of standing waves, turbulence and the like are solved. Therefore, the definition and the stability of sound can be improved, the distortion and the deformation of the sound are reduced, and the reduction degree and the accuracy of audio are improved.

The application discloses a bogie bottom drag reduction cladding plate and a high-speed train bogie, and the cladding plate comprises a torsion bar cladding plate for cladding a torsion bar of a bogie frame, a first cladding plate for connecting a cross beam on one side of the torsion bar, and a second cladding plate for connecting a cross beam on the other side of the torsion bar. The first cladding plate and the torsion bar cladding plate form a first flow guide slope, the second cladding plate and the torsion bar cladding plate form a second flow guide slope, and the flow guide directions of the first flow guide slope and the second flow guide slope are symmetrically arranged. The application guides the airflow originally acting on the region near the center pin hole and the torsion bar to the lower side of the torsion bar cladding plate, optimizes the partial cladding and flow guide of the originally complex and abrupt bottom profile near the center pin hole and the torsion bar, forms a relatively continuous bottom flow guide surface, weakens the direct interference between the airflow and the complex components of the bottom, reduces the local flow separation, backflow and vortex intensity, improves the bogie bottom flow field distribution, and further achieves the purpose of reducing the aerodynamic drag of the bogie region.

The present invention provides a broadband antenna for 5G millimeter wave, comprising a substrate, a first antenna, a second antenna, an impedance matching segment and a ground layer. The substrate comprises a first surface and a second surface. The first antenna comprises two first frequency band units, which are respectively arranged on the first surface and the second surface. The second antenna comprises two second frequency band units, which are respectively arranged on the first surface and the second surface. The impedance matching segment is electrically connected to one of the first frequency band units arranged on the first surface. The ground layer is electrically connected to another first frequency band unit arranged on the second surface. When the first antenna is working, the second antenna is regarded as a director; when the second antenna is working, the first antenna is regarded as a reflector. Thereby, a bandwidth that fully covers the 5G millimeter wave NR (newradio) frequency band is provided.

The utility model relates to the technical field of sound equipment, and discloses a sound equipment structure capable of adjusting a sound field, the sound equipment structure comprises two ropes and a group of connecting pieces, the connecting pieces are arranged on the two ropes in a distributed manner, a group of walking mechanisms are arranged on the surfaces of the two ropes, and an electric push rod is arranged below each walking mechanism. According to the sound box structure capable of adjusting the sound field, the regional position adjustment of the sound box main body on the horizontal plane is realized through the movement of the walking mechanism on the rope track, the coverage range can cover linear, arc-shaped or grid layout, and the height of the sound box is adjusted by stretching and retracting the electric push rod, so that the sound box structure adapts to sound field projection requirements of spaces with different floor heights, such as theaters and exhibition halls; the pitch axis and the angle axis respectively control the pitch angle and the horizontal orientation of the sound box, ensure that the sound wave directivity is accurately matched with the audience position, directly optimize the sound source position and directivity, reduce the reflection sound stem from the source, and solve the problems of sound focusing, reverberation abnormity and the like which are difficult to process by a pure electronic means in a complex space.

The present application relates to the technical field of low-carbon transportation construction, and in particular to a low-carbon intelligent urban traffic guidance method, system and storage medium, which include: obtaining static information of urban roads and equivalently generating a pipeline network model, and setting ideal load data based on the static information of urban roads; collecting dynamic information of urban roads including traffic flow and equivalently adding liquid flow to the pipeline network model and setting real-time flow data of liquid flow; setting time parameters so that the pipeline network model simulates flow tasks within the time range corresponding to the time parameters, and monitoring the dynamic changes of real-time flow data of each pipeline in the flow task; comparing the dynamic changes with the ideal load data, and generating a liquid flow guidance plan based on the comparison results; verifying the liquid flow guidance plan so that the liquid flow guidance plan is equivalent to a vehicle flow guidance plan. The present application has the effect of realizing a streamlined prediction of carbon emission impact scenarios of complex traffic flows and low-carbon guidance of traffic flows.

The invention belongs to the technical field of film sensors, and particularly relates to a method for improving the directivity of ultrasonic longitudinal wave signal propagation, a pre-tightening force sensor and a method for determining the diameter of an electrode layer, and the method for improving the directivity of ultrasonic longitudinal wave signal propagation is applied to the pre-tightening force sensor. The pretightening force sensor comprises a bolt and a film sensor, the bolt comprises a head and a screw with threads, the film sensor comprises piezoelectric layers and electrode layers, and the piezoelectric layers and the electrode layers grow on the top end face of the head in situ layer by layer from inside to outside. And the ultrasonic longitudinal wave signal propagation directivity is improved by enabling the diameter of the ultrasonic longitudinal wave to be matched with the nominal diameter of the bolt. According to the invention, the influence of the size difference between the bolt head and the screw of the pre-tightening force sensor and the diameter of the electrode layer on the pre-tightening force detection precision can be solved, and the accurate measurement of the pre-tightening force is realized.

The application discloses a loudspeaker and a vehicle, the loudspeaker comprises a basket assembly and a cone assembly, the cone assembly comprises a folded ring and a cone, the outer side of the folded ring is connected with the basket assembly, the inner side of the folded ring is connected with the outer side of the cone, and the inner side of the cone is connected with a voice coil of the basket assembly. The thickness of the folded ring is greater than the thickness of the cone, the outer side of the cone is provided with a flange, the flange corresponds to the position of the ring cavity of the folded ring, and the flange extends away from the ring cavity. The loudspeaker disclosed by the application increases the flange on the cone, in the vibration process of the loudspeaker, the flange can adjust the vibration characteristics of the edge of the cone, suppress unnecessary vibration harmonics, guide and reflect sound to a certain extent, reduce scattering and interference of sound in the propagation process, make the sound radiate more concentratedly forward, and thus enhance the propagation effect of the sound. The design of the single flange reduces the use of materials and the processing difficulty while ensuring the performance improvement, and reduces the manufacturing cost of the loudspeaker.

The invention, which relates to the technical field of expansion joint detection, discloses a GIS expansion joint intelligent detection alarm device comprising a sensor component, a repeater and a monitoring terminal. The sensor part is responsible for collecting displacement data of the expansion joint in real time, the repeater is responsible for receiving the displacement data of the sensor part and forwarding the displacement data to the monitoring terminal, and the monitoring terminal is responsible for receiving and processing the displacement data. The expansion joint displacement detection device is stable in structure, once the expansion joint displaces, the angle, the distance and the like can be changed, detection data can also be changed, in the detection process, operation and maintenance workers do not need to manually detect the data in real time, collect the displacement data of the expansion joint through a sensor component and transmit the displacement data to a monitoring terminal, the inspection work of the workers is reduced, and the detection efficiency is improved. The labor cost is saved, and real-time monitoring is realized.