14 results about "Spherical array" patented technology

The invention relates to a uniform spherical array time domain sound source localization method based on a neural network, and belongs to the technical field of sound source localization. The method comprises the following steps: constructing a uniform spherical microphone array, and arranging microphones on a spherical surface by adopting a golden angle distribution strategy; collecting a multi-channel time domain audio signal; a time domain signal is input to a deep regression neural network, the network comprises a time domain encoder, a Transform encoder and a full connection layer, and continuous coordinates of a sound source in a three-dimensional space are directly output. According to the method, frequency domain conversion and space grid division are avoided, the positioning precision, the calculation efficiency and the three-dimensional full-space applicability are improved, and the method is suitable for real-time sound source positioning in a complex acoustic environment.

This invention belongs to the field of spherical array layout design, and discloses a broadband high-gain spherical array layout method based on co-frame design, according to the upper limit f of the operating frequency of the closely packed spherical array. max Calculate the approximate element spacing d0 = (c / f max Step 2: Based on the array space, calculate the maximum diameter R, vertical height H, and vertical arc length L of the spherical array. H This invention addresses the problem of insufficient low-frequency gain caused by the limited installation space of spherical arrays. By using a design that combines a vector sparse spherical array with a scalar close-packed conformal array, it achieves high low-frequency gain, enabling it to have broadband high array gain with only a slight increase in the number of preprocessing channels, thus meeting the requirements for full-band detection.

This invention relates to the field of pressure testing technology and discloses an omnidirectional pressure measurement system and method. The omnidirectional pressure measurement system includes a spherical piezoelectric sensor array module, a signal conditioning module, a signal storage and transmission module, and a host computer. The spherical piezoelectric sensor array module collects pressure signals in space, processes them through the signal conditioning module, and transmits them to the host computer via the storage and transmission module. The host computer calculates the pressure field intensity and pressure source location at each point and reconstructs the pressure field using the data. This invention employs a spherical array design with a dodecahedral vertex topology, enabling the system to achieve multi-angle information acquisition and depth perception, eliminating detection blind spots. This invention constructs a weighting function in a spherical coordinate system, calculates the pressure intensity at each point in space using a weighted average, estimates the initial position of the pressure source by squaring the measured value, and combines iterative algorithms for precise positioning. This invention not only improves measurement accuracy and efficiency but also enables the reconstruction of dynamic pressure fields.

The invention discloses a photovoltaic maximum power point detection and visualization system with a human-computer interaction interface, and belongs to the technical field of solar photovoltaic power generation. The photovoltaic maximum power point detection and visualization system is composed of a spherical detector array device, a multi-channel signal acquisition front end, a tracking and power generation part and an upper computer visualization analysis terminal. The spherical detector array device is of a hemispherical structure, a detector array is carried on the outer surface of the spherical detector array device, and the multi-path signal acquisition front end is connected with the spherical detector array device and is composed of an analog switch array module, a signal conditioning circuit module, an MCU control core module, a Lora wireless communication module, a man-machine interaction display module and a power monitoring module. According to the method, illumination distribution is directly detected by adopting a spherical array, and the actual maximum power point direction can be more accurately found in complex weather such as local shadow and cloudy weather; and a local human-computer interaction interface is integrated, so that field maintenance personnel can intuitively obtain a system state and a tracking target in real time.

The application particularly relates to a wind noise source directivity quantization evaluation method. The method comprises the following steps: S1, wind noise directivity test of an in-vehicle spherical array, arranging a spherical microphone array to obtain a spatial distribution nephogram of the in-vehicle wind noise source; S2, spatial angle partition of the wind noise directivity, decomposing the noise source according to spatial regions, and performing equi-angle partition on the in-vehicle space; S3, frequency decomposition of the wind noise directivity, constructing an information matrix according to different frequencies; S4, establishing a quantization evaluation index of space and frequency according to the sound source information matrix, and identifying a short board; and S5, combining the in-vehicle spherical array test position and the quantization evaluation index to form an evaluation method classified according to working conditions, and judging the wind noise source directivity level of a developed vehicle model. The spatial angle partition and frequency decomposition of the sound source effectively support the achievement of the whole vehicle wind noise performance target and the analysis of the wind noise problem.

This invention discloses an asynchronous measurement technique for 3D imaging of multi-point, non-planar low-frequency sound sources. It utilizes two 64-channel 3D spherical arrays for asynchronous measurement, proposing a unique dual-cylindrical spiral ascent and rotation movement method to achieve 3D point source imaging within low-frequency sound sources. This method differs from previous directional methods. It employs an asynchronous measurement technique involving the centers of two spherical arrays following a designed dual-cylindrical spiral parallel ascent trajectory and the array's rotation, applied to 3D imaging of multi-point, non-planar low-frequency sound sources. This results in a larger and denser array. To a certain extent, the asynchronous measurement method combining the dual-cylindrical spiral trajectory and rotation further improves the density of synthesized microphones compared to cylindrical trajectory asynchronous measurement methods and spherical array center revolution-rotation asynchronous measurement methods. The method is stable and efficient.

The invention discloses a vacuum sealing plate based on a sphere array and a split type vacuum hot pressing preparation method thereof, and belongs to the field of materials, the vacuum sealing plate is formed by hot pressing fusion of an upper function plate and a lower function plate in a vacuum environment, and a two-dimensional array formed by countless independent vacuum sphere units is formed in the vacuum sealing plate. Respectively prefabricating an upper functional board and a lower functional board which are provided with hemispherical pit arrays through injection molding; the prefabricated upper function plate is loaded into a vacuum operation chamber and accurately aligned, and vacuumizing is conducted till the vacuum degree is smaller than or equal to 1 Pa; the butt joint faces of the upper function plate and the lower function plate are heated to be in a molten state, pressure is applied to enable the upper function plate and the lower function plate to be folded, and the two corresponding hemispherical pits are sealed into an independent vacuum sphere unit; and maintaining pressure and cooling to obtain a finished product. The prepared multi-cavity vacuum sealing plate has excellent sound insulation and heat insulation performance, extremely high structural reliability, excellent bending performance and convenient secondary processability which other single-cavity vacuum plates do not have, and can be widely applied to the fields of vehicle light weight and building energy saving.

The invention discloses a multi-sensor efficient integration verification method, system and device based on multiple phase centers and a medium, and relates to the field of radio frequency sensor dynamic integration verification. Aiming at the defect that a single-phase center of a traditional darkroom cannot verify multiple sensors at the same time, multiple phase centers in the same airspace are constructed in the darkroom based on a multi-band triple spherical array radiating antenna, and tested equipment is deployed through multiple synchronously-controlled six-degree-of-freedom motion platforms to ensure attitude consistency; the system master console resolves scene parameters in real time, and high-precision angle and echo simulation is carried out through the array feed control subsystem and the comprehensive signal source; cooperative verification of electronic reconnaissance interception guide radar tracking and radar tracking guide attribute identification is realized in a closed loop. According to the method, the physical space limitation of a darkroom is broken through, a complex space three-dimensional dynamic interaction scene is reproduced with high confidence, and the blank of complete machine multi-sensor cooperative capability integrated verification is filled.

The invention relates to the technical field of medical instruments and information, and discloses an oral cavity scanner and an oral cavity scanning method, and a self-adaptive flexible shell, the appearance of the self-adaptive flexible shell is set to be of a spherical structure matched with the geometrical shape of the human oral cavity, and the self-adaptive flexible shell is made of a biocompatible elastic material; a rubber bracket is arranged in the self-adaptive flexible shell to limit the relative spatial relationship of the imaging array, and the self-adaptive flexible shell has preset Shore hardness to keep the relative topological reference of internal components through the rubber bracket when the self-adaptive flexible shell is pressed to deform. By means of the spherical array topology and the 140-degree wide-angle macro lens, 360-degree full coverage of the inner wall of the oral cavity is achieved, the problem of collection dead angles of a traditional handheld device in a posterior molar area, a lingual area and the edge of gingiva is solved, handheld guiding is replaced with a self-adaptive flexible sphere holding mode, a user does not need to have professional anatomical knowledge or steady-state control ability, and the user experience is improved. And the operation difficulty in a home scene is greatly reduced.

The invention provides a three-dimensional dereverberation beam forming method and system based on a cross-correlation matrix, and relates to the technical field of sound source recognition, and the method comprises the steps: collecting sound pressure data through a spherical microphone array; performing fast Fourier transform on the sound pressure data to obtain corresponding frequency domain data; calculating a cross-spectrum matrix corresponding to the spherical array according to the frequency domain data; eliminating reflected sound components contained in the cross-spectrum matrix to obtain a filtered cross-spectrum matrix; and drawing a sound source identification cloud picture based on the filtered cross spectrum matrix. According to the three-dimensional dereverberation beam forming method based on the cross-correlation matrix, the technical problem of insufficient sound source recognition precision of a spherical array in a complex sound field environment in the related technology is solved.

The invention discloses a method and a system for quickly and accurately controlling the angular position of a multi-radiation source target. The system comprises a target simulator, an array feed unit and a main control unit, a device control code mapping table is pre-stored in the main control unit; the main control unit performs cooperative control on the target simulator and the array feed unit, and the target simulator generates a multi-radiation source target signal, a pulse synchronization signal, a frequency code and a target code; the array feed unit is triggered by a rising edge of a pulse synchronization signal, calls a device control code from a device control code mapping table according to a target code and a frequency code, performs triple branch channel distribution and amplitude-phase modulation on a multi-radiation source target signal, and radiates to a tested device by a spherical array antenna; according to the invention, rapid and accurate simulation of the multi-radiation source target angular position along with pulse synchronization is realized.

The application discloses a multi-sensor efficient integration verification method, system, device and medium based on multiple phase centers, relates to the field of radio frequency sensor dynamic integration verification, and aims at the defect that a traditional darkroom single phase center cannot verify multiple sensors simultaneously, constructs multiple phase centers based on a multi-band triplet spherical array radiation antenna in the darkroom, deploys a test device through multiple six-degree-of-freedom motion tables to ensure attitude consistency, and realizes the cooperative verification of electronic reconnaissance interception guiding radar tracking and radar tracking guiding attribute identification in a closed loop. The application breaks through the limitation of the physical space of the darkroom, reproduces a complex spatial three-dimensional dynamic interaction scene with high confidence, and fills the gap of the integration verification of the cooperative capability of the whole machine multiple sensors.

A hologram acquisition apparatus and a hologram acquisition system are disclosed. A hologram acquisition apparatus includes a beam splitter configured to split light emitted from an object into a first beam and a second beam, a first reflective optical element configured to receive and emit the first beam to the beam splitter, and a second reflective optical element configured to receive and emit the second beam to the beam splitter and formed as an annular spherical array having discontinuous surfaces, wherein the second reflective optical element has a plurality of segment regions that are concentric and divided to have the discontinuous surfaces and, the plurality of segment regions are formed to have the same focal point.

This application relates to the field of wind tunnel simulation testing technology, specifically to a complex wind environment simulation testing device, used to solve the problem in existing wind tunnels where direct convergence of airflow can easily lead to turbulence and impede airflow quality improvement. It includes a support frame and a wind tunnel assembly connected to the support frame; wherein the wind tunnel assembly includes multiple sub-wind tunnels, each sub-wind tunnel having an inlet and an outlet. All the inlets are arranged in a spherical array, and all the outlets are arranged in a rectangular array. The inlets have an arc-shaped flared structure, and the outlets of all the sub-wind tunnels are arranged adjacently so that the overall structure of all the sub-wind tunnels forms a contraction shape. This application utilizes the inlets to provide guidance, reducing airflow rebound, and since each sub-wind tunnel is independent, turbulence is less likely to occur, resulting in a relatively high quality of the final output airflow.