15results about How to "Achieve noise" patented technology

The invention provides a hybrid vehicle charging power NVH matching method, device and equipment and a medium, and belongs to the technical field of plug-in hybrid new energy vehicle type NVH control. The method comprises the following steps: performing modal identification on a steering wheel and a seat of a real vehicle to obtain a modal identification result under an idling working condition of the vehicle; calibrating a rotating speed operation interval of the engine under an idling operation condition; according to the modal recognition result, the engine rotating speed operation interval is adjusted; sweep frequency is performed on a whole vehicle power point through fixed engine rotating speed excitation to generate an output power curve; acquiring first electricity utilization power of the vehicle equipment; and carrying out power matching according to the first electric power and the output power curve, thereby knowing that the idling charging power of the whole vehicle is optimized from the perspective of NVH performance development, and systematic matching is carried out from three parts of excitation source-transmission path-response. The rotating speed of the engine is adjusted to avoid noise and vibration caused by a resonance band of the whole vehicle, and the effect that vibration and noise are small when the whole vehicle works in an idling charging mode is achieved.

The invention discloses an anti-seismic photoacoustic cell and a vibratory photoacoustic spectrometry gas detection system. The anti-seismic photoacoustic cell comprises a photoacoustic cell body, a light source and a light source, a photoacoustic cell cavity, a microphone rear cavity and a microphone diaphragm are arranged in the photoacoustic cell body; the microphone diaphragm is positioned in the photoacoustic cell cavity and the microphone rear cavity and separates gas in the photoacoustic cell cavity and the microphone rear cavity; the gravity center position of the microphone rear cavity and the gravity center position of the photoacoustic cell cavity are located on the same side of the microphone diaphragm, and the gravity center position of the microphone rear cavity is farther from the microphone diaphragm than the gravity center position of the photoacoustic cell cavity. In the vibration environment, the inertia acting force of the microphone diaphragm and the inertia acting force of gas on the two sides of the microphone diaphragm are opposite and can be counteracted mutually, and noise caused by external vibration can be restrained. The vibration optical photoacoustic spectrometry gas detection system adopts the anti-vibration photoacoustic cell, noise caused by external vibration can be inhibited, and the signal-to-noise ratio and the detection limit of photoacoustic spectrometry gas detection are improved.

The invention discloses a low-field nuclear magnetic resonance exploration device and method capable of effectively shortening dead zone time, and relates to the field of electric signal acquisition, and the device comprises an upper computer which is used for communicating with a main control circuit; the main control circuit is used for controlling and collecting the core and comprehensively controlling the work of the device; the power amplification circuit is used for amplifying the power signal input by the main control circuit and then transmitting an alternating current pulse to excite the coil; the beneficial effects of the invention are that the coil employs a transmit-receive integrated differential structure, which inhibits common-mode noise interference and improves the signal-to-noise ratio of detection; the Q-conversion circuit reduces the quality factor of the coil through parallel connection of energy discharge resistors at the two ends of the coil, the purpose of rapidly discharging energy stored in the coil is achieved, and the dead time can be effectively shortened; the high-isolation fast-switching radio frequency switch can effectively reduce the insertion loss and the generated noise, significantly reduce the switching time, further shorten the dead zone time, and improve the detection effect of a short relaxation target body.

The invention discloses a dual-redundancy safety protection elevator door motor device and a using method thereof, and relates to the technical field of elevator door motor devices.The dual-redundancy safety protection elevator door motor device comprises a supporting beam, a door body, two sets of rotating wheels, two sets of power guarantee assemblies, a connecting plate and a moving belt; a moving belt is installed on the outer wall of the rotating wheel, two sets of connecting plates are installed on the outer wall of the moving belt, and one end of each connecting plate extends to the outer wall of the supporting beam. A first clamping rod is stably moved out of a clamping groove by installing a second cylinder to move, at the moment, a first moving rod moves to drive a first motor to move horizontally, the first motor moves horizontally to enable the output end of the first motor to move out of a connecting sleeve, and at the moment, the output end of the first motor of the other power guarantee assembly moves into the connecting sleeve to be used alternately. When the elevator door motor device breaks down, standby power can be replaced in time, and the functions of dual-redundancy safety protection and use safety improvement are achieved.

The utility model provides a kind of ship exhaust gas denitration desulfurization sound attenuation white integration device, the device includes the smoke inlet, SCR reactor, primary expansion cavity, secondary expansion cavity, steam heat exchanger and smoke outlet that are sequentially communicated, first spray layer is arranged in the primary expansion cavity, second spray layer is arranged in the secondary expansion cavity, to realize the efficient cooperation and space multiplexing of each function section. Through modularization nesting design and structure function multiplexing, the problems of large space occupation, low efficiency, high energy consumption and inconvenient maintenance existing in the prior art are solved, and through structure design, desulfurization and noise reduction functions are simultaneously realized.

The present application discloses a method and system for reconstructing a reflected echo, which belongs to the field of signal processing technology. In the method for reconstructing a reflected echo of the present application, a complete reflected echo is composed of M frame, <h2 style=";text-align:left;direction:ltr">M×N sampling points, where each frame is sampled with a delay T Complete data sampling, sampling at equal intervals per frame N point, at each <h2 style=";text-align:left;direction:ltr"> A / D The interval time of the conversion cycle is used to realize synchronous data accumulation. When a complete reflection echo sampling is completed, the synchronous accumulation is also completed. M Frame sampling data reorganization, <h2 style=";text-align:left;direction:ltr"> Qavg The complete reflected echo is accumulated and averaged, logarithmically transformed, and curve fitted to achieve the reproduction of reflected echoes. Through data analysis, transmission loss and fault point detection are completed. This application meets the sampling accuracy conditions. <h2 style=";text-align:left;direction:ltr"> A / D Converter to 1 / M The sampling rate meets the performance requirements of the full load sampling rate, which can greatly reduce the <h2 style=";text-align:left;direction:ltr"> A / D The high-speed sampling rate requirements of the converter reduce the background noise, and the power consumption and cost of the signal analysis system are also greatly reduced.

The present invention relates to an image processing method, device, equipment and medium, and to the field of data processing technology. The method comprises: obtaining pixel points in a target image to obtain a target point set; selecting point set data that meets a deviation range from the target point set to obtain a data set to be sorted; determining an in-boundary data set and an out-boundary data set according to a preset boundary value and the data set to be sorted; combining the in-boundary data set and the out-boundary data set to obtain a sorting result; connecting the pixel points in the sorting result to obtain a processed image. By excluding the point set data that does not meet the deviation range, anti-noise and abnormal point processing are achieved, the robustness of the image processing algorithm in a noisy environment is improved, and the stability of the generated image is ensured.

The invention relates to an indoor intelligent environment control system in the technical field of intelligent supervision. The indoor intelligent environment control system comprises a main logic control circuit and an output control end circuit. According to the invention, interconnection and intercommunication of information data of a supervision place and electric equipment are realized in a mode of combining RS485 communication, wireless radio frequency communication, Bluetooth communication and wired Ethernet communication. Real-time networking of all prison rooms and a master control room is achieved through combination of wired Ethernet communication and RS485 communication, environment parameters in all prison rooms are collected in a centralized mode, devices in all prison rooms are accurately controlled, real-time networking, collection and sending of the environment parameters in the prison rooms are achieved through combination of RS485 communication, wireless radio frequency communication and Bluetooth communication in the prison rooms, and real-time monitoring of the prison rooms is achieved. And data support is provided for control equipment. Physical networking of electric equipment in a prison room is achieved, the power supply system is controlled to be turned on and turned off through the low-voltage circuit, and therefore operation of the electric equipment is controlled. And the voltage regulating module is controlled to work through pulse output of the control port, so that the electric equipment is controlled to operate.

The invention discloses energy-saving and noise-reducing dust removal equipment, and relates to the field of dust removal equipment design, the energy-saving and noise-reducing dust removal equipment comprises a rack, and a dust removal module is mounted on the rack; the dust removal module comprises a sound absorption and noise reduction module and an air blowing module, and one side of the sound absorption and noise reduction module is mounted on the air blowing module in a half-surrounding and covering manner; the effects of sound absorption and noise reduction can be achieved, and the sound is controlled within 80 decibels; the air blowing module comprises a machine shell and one or more rotating shafts, a vent groove is formed in the top side of the machine shell, the rotating shafts are installed on the bottom side in the vent groove in a rotating fit mode, the bottom ends of the rotating shafts are arranged in a manner of penetrating into the machine shell, air blowing rods are fixedly installed at the bottom ends of the rotating shafts, and the air blowing rods of every two adjacent rotating shafts are arranged in a staggered mode; the requirement for the air blowing amount is small, and the energy-saving effect can be achieved; airflow channels are formed between the two sides of the bottom side of the air blowing module and the sound absorption and noise reduction module, and exhaust pipelines are connected to the airflow channels; and air with dust can be exhausted through vacuumizing adsorption of the airflow channel.

This invention discloses a method and system for detecting surface defects in stainless steel pipes, comprising: S1, acquiring line scan images of stainless steel pipes under dark and bright illumination; S2, stitching the line scan images into dark and bright cylindrical unfolded images, and performing brightness equalization and reflection suppression processing; S3, performing pixel-level fusion of the dark and bright cylindrical unfolded images according to set weights; S4, inputting the fused cylindrical unfolded image into the backbone of a YOLO network integrating a Swing Transformer module to extract multi-scale feature maps; S5, performing feature fusion and bounding box prediction, and outputting the bounding box, confidence score, and category label of the defect; S6, performing semantic segmentation and grayscale segmentation in the detection box region and weighted fusion to generate a final defect mask; S7, calculating the area, length, width, and centroid coordinates of the defect, and converting them into actual dimensions and spatial positions. This invention improves the accuracy and stability of stainless steel pipe surface defect identification.

The invention provides a front low-noise light amplification method and system for a coherent detection laser radar, and the system comprises a continuous laser receiving and transmitting module which is used for transmitting detection light and receiving an echo signal, and the echo signal serves as first signal light; the double-pump generation module is used for generating second signal light and idler frequency light having a relative phase relation with the second signal light, and the second signal light and the idler frequency light serve as first pump light and second pump light respectively; the phase sensitive light amplification module is used for performing phase sensitive light parametric amplification after the first signal light is combined with the first pump light and the second pump light; the phase locking module is used for locking the relative phase between the double-pump light and the first signal light in the phase sensitive light amplification module; and the coherent detection module is used for detecting the first signal light amplified by the phase-sensitive optical parameter and demodulating information in the target. Weak optical signals can be amplified in a high-gain mode, amplification of same-frequency background noise can be restrained, and the signal-to-noise ratio and coherent detection efficiency of echo signals can be improved.

This application relates to the field of environmental monitoring technology, specifically providing a method, apparatus, storage medium, and electronic device for monitoring the construction environment. The method may include: during the construction of a tunnel boring machine (TBM) in a target area, collecting the original vibration signal generated by the TBM and the TBM's construction parameters; wherein the construction parameters include thrust and torque; inverting the pre-processed vibration signal from the original vibration signal to obtain a three-dimensional underground velocity model; obtaining the wave velocity change rate based on the underground three-dimensional velocity model, and obtaining index values ​​of rock mass anomalies based on the processed vibration signal; analyzing the construction parameters, the wave velocity change rate, and the index values ​​to obtain monitoring results for the target area; wherein the monitoring results include a risk level and response measures to address the risk level. The embodiments of this application can achieve dynamic monitoring of the construction environment and provide real-time risk warnings.

The utility model relates to the field of Roots vacuum pumps, in particular to a low-noise Roots vacuum pump. The technical problem to be solved by the utility model is to provide the low-noise roots vacuum pump which can carry out multi-stage noise reduction treatment on airflow noise generated in an exhaust process and realize sound energy absorption, vibration isolation and thermal noise control. A low-noise roots vacuum pump comprises a pump body. Two rotors which synchronously rotate in opposite directions are transversely arranged in the pump body; an air inlet is formed in the top of the pump body, an air outlet is formed in the bottom of the pump body, and a hush pipe used for eliminating exhaust noise is fixedly connected to the air outlet in the bottom of the pump body; the silencing pipe comprises a main pipe body; the two ends of the main pipe body are sleeved with connecting discs respectively. According to the utility model, airflow noise generated in the exhaust process is subjected to multi-stage noise reduction treatment, and the effects of sound energy absorption, vibration isolation and thermal noise control are realized.

The invention relates to a partial discharge detection method for an inflatable switch cabinet, and the method comprises the steps: collecting a suspension discharge signal in the cabinet, carrying out the frequency domain signal analysis of the discharge signal, and obtaining the frequency domain characteristics of the suspension discharge signal in the inflatable switch cabinet; acquiring suspension discharge signals outside the switch cabinet and analyzing frequency domain signals of the discharge signals to obtain frequency domain characteristics of the suspension discharge signals outside the inflatable switch cabinet; finally, whether partial discharge exists in the inflatable switch cabinet or not is judged, and if the PRPD atlas characteristics of the partial discharge conform to the suspension discharge characteristics, the measured signals are directly analyzed according to the frequency domain characteristics of the suspension discharge signals inside and outside the inflatable switch cabinet. According to the distribution characteristics of the signal frequency, the judgment and noise elimination of suspension discharge inside and outside the switch cabinet are realized, and the partial discharge detection rate, namely the accuracy, is improved.

This invention relates to the field of intelligent control technology, and discloses a sleep control method, device, air purifying equipment, and storage medium. Applied to an air purifying equipment, the equipment includes multiple air outlets disposed around the perimeter of the casing and an air outlet disposed on the top of the unit. Each air outlet is equipped with an independently openable and closable baffle assembly for controlling the opening and closing of the corresponding air outlet. The method includes: acquiring sleep-related parameters of the user, including at least: preset sleep period information, user status data, and ambient light intensity; determining the user's current target sleep stage based on the preset sleep period information, user status data, and ambient light intensity; matching and executing a control strategy corresponding to the target sleep stage. The control strategy controls the fan of the air purifying equipment and selectively controls the opening and closing states of air outlets at different locations according to different sleep stages, providing a more comfortable sleep environment for the user.