452 results about "Speed measurement" patented technology

The invention relates to a long-gap discharge leader development speed measurement method based on radiated electromagnetic wave detection. The method comprises a set of high-frequency antennas and a high-speed oscilloscope and a long-gap discharge leader development speed calculating method. The method adopts a certain antenna arrangement form; long-gap discharge radiated electromagnetic wave pulse time is detected simultaneously through the plurality of antennas; leader head position is positioned according to time difference of a signal arriving at different antennas; and furthermore, the long-gap discharge leader development speed can be calculated. The method can effectively improve the measurement precision of the discharge leader development speed, and resolution reaches the level of 0.1 ns.

The invention discloses a flow velocity measurement system adopting bubble tracing, and the system comprises a circulation loop which is internally provided with a medium storage tank and a pump body; the air supply branch is connected into the circulation loop and provided with an air storage tank, and the air storage tank is used for supplying air to the circulation loop so that bubbles can be generated in the circulation loop; and the flow velocity measuring device is used for monitoring bubbles in the circulation loop. In conclusion, the flow velocity measurement device obtains the bubble motion information from the outside of the circulation loop, and a speed measurement device such as a sensor does not need to be inserted into the circulation loop, so that disturbance to a medium flow field in the circulation loop is avoided, the measurement is more real and reliable, and the accuracy is higher.

The invention discloses an automobile long-distance speed recognition and tracking method based on target detection, and the method comprises the steps: collecting a vehicle driving video in real time through a fixed camera position and angle, and carrying out the recognition of a vehicle in each frame of image of the video through a pre-trained YOLOv12 target detection model; performing preliminary speed estimation on the automobile by adopting an inter-frame difference method, further constraining a speed change rate, and performing time sequence correction on the speed change rate by adopting Kalman filtering to obtain a corrected speed estimation value; calculating the displacement and the motion deflection angle of the adjacent frames in the transverse and longitudinal directions, and integrating the displacement and the motion deflection angle with the corrected speed estimation value to form a time sequence input feature; and carrying out modeling on a historical track through the trained time sequence deep learning model to realize dynamic speed correction. According to the method, the dependence on physical space calibration is obviously weakened, the perception capability of the model on the motion trend is improved, and the method is suitable for vehicle tracking and speed measurement tasks in long-distance and low-resolution scenes.

According to the novel transponder device and the method and device for achieving multiple functions through power line carrier communication, multiple functions such as train positioning and speed measurement, station track occupation recognition, train occupation and integrity check and train-ground communication are achieved through the novel transponder device and the power line carrier communication, and wireless communication technologies such as the power line carrier communication are integrated; the method can be applied to train operation control, train-ground coordination action, locomotive vehicle information management, unmanned stations and train state monitoring in various scenes, can simplify the types of equipment, reduces the construction cost and the maintenance workload, and improves the transportation efficiency and safety at the same time.

Embodiments of the present application provide a data processing method, device and equipment, the method comprising: obtaining a sequence set, the sequence set comprising a plurality of sequences, there being at least one first sequence among the plurality of sequences, the self ambiguity function of each first sequence being a thumbtack shape, the sidelobe energy of the cross ambiguity function between each first sequence and other sequences in the sequence set being less than a first threshold; transmitting a signal according to the sequences in the sequence set, the signal being used for speed measurement and / or distance measurement. The accuracy of radar measurement is improved.

The utility model discloses a motor speed measuring device, which comprises a fixed seat, a friction mechanism and a speed measuring mechanism, the friction mechanism is movably connected to the fixing base and used for abutting against a rotating shaft of a motor. The speed measuring mechanism is installed on the fixing base and used for detecting the rotating speed of the friction mechanism. The motor speed measuring device is simple to operate, can flexibly adapt to different motor rotating shafts, and does not need to adjust and replace parts complexly, thereby remarkably improving the adaptability to various motors. Meanwhile, the speed measurement performance is optimized through the specialized design that the friction mechanism and the speed measurement mechanism are separated, high-precision rotation speed measurement can be achieved, the stability of the motor speed measurement device is guaranteed through the fixing base, external interference is reduced, the measurement precision is further improved, and the high-precision motor speed measurement requirement is met.

This invention discloses a method and system for acquiring pantograph contactor images, belonging to the field of railway power supply contact network detection technology. It uses a photoelectric sensor signal as a trigger. When the photoelectric sensor module detects an approaching train, it controls the pantograph imaging module to take a picture based on a system-preset speed and the radar's measured speed. After the train passes, the image's stretching / compression ratio is calculated based on the radar's final detected speed and the system-preset speed. The identified pantograph contactor image is then stretched, compressed, and segmented to obtain the final pantograph contactor image. By introducing a photoelectric sensor, both the sensor and radar can identify approaching trains. Furthermore, by combining the imaging process based on real-time radar speed measurement and a system-preset speed, even if a train is missed by the radar, the entire image acquisition process can be completed based on the photoelectric sensor's identification and the system-preset speed, avoiding the problem of missed trains by the radar.

The application discloses a train positioning and speed measuring system and method with meter-level resolution TGD-OFDR, which comprises a TGD-OFDR optical path, a signal acquisition and demodulation module, a noise reduction module and a positioning and speed measuring module connected in sequence; the TGD-OFDR optical path couples the probe light with the local reference light; the signal acquisition and demodulation module processes the received optical signal to obtain real phase data; the noise reduction module uses the STAWDA algorithm to dynamically analyze the time-space correlation of the signal and the noise, enhances the effective vibration signal and suppresses random noise and interference; the positioning and speed measuring module calculates the differential phase curve based on the phase data after noise reduction, and determines the train position and speed through the time difference of the vibration position. The application effectively improves the train positioning accuracy and speed real-time monitoring, can acquire and process signals in real time, meets the positioning and speed measuring application requirements of the train in the actual scene, and provides reliable support for real-time monitoring and long-distance track train safe operation in the train operation process.

The application relates to the technical field of rotational speed measurement, in particular to a high-precision multi-shaft rotational speed measuring device and a rotational speed measuring method thereof, which comprises a detection main body and further comprises the following: a plurality of groups of round holes are arranged on one side of the detection main body; a speed measuring mechanism for measuring speed is arranged, the speed measuring mechanism comprises a cylinder arranged in the installation cavity, the end of the cylinder is rotationally connected with a sleeve through a bearing, a limiting rod fixedly connected with the inner wall of the installation cavity is arranged in the sleeve, a first gear is sleeved on the surface of the cylinder, and the surface of the first gear is meshedly connected with a second gear. Through the cooperation of various components, the output shaft of the equipment to be detected can be clamped and fixed, the first gear and the second gear are cooperated, the sleeve starts to rotate when following the rotation of the equipment to be detected, the second gear starts to rotate and drives the meter to rotate to start measurement, the result is displayed on the display of the detection main body, and the accuracy of the detection result is ensured.

The application provides a bearing gear fault automatic diagnosis method, system, equipment and storage medium, the method comprises the following steps: obtaining a sampling frequency through a spectrum sensing sampling frequency convex optimization algorithm; obtaining the installation number of a signal sensitive sensor through a multi-factor weighted constraint scaling algorithm; obtaining a signal to be processed according to the sampling frequency and the installation number of the signal sensitive sensor, processing the signal to be processed, and obtaining a fault diagnosis result; the bearing gear fault automatic diagnosis method solves the problem of monitoring the inventory equipment; when processing the signal, a hardware pulse is used as a sampling clock source, software interruption and the delay and jitter of calculation are avoided, high-precision synchronous sampling is realized, the non-stationary phenomenon of the signal caused by speed fluctuation is eliminated, and the signal analysis precision is improved; speed measurement and sampling frequency adjustment are completed within one pulse period, the response is fast, and high-speed and high-dynamic speed changes can be tracked; the bearing gear fault automatic diagnosis method has a wide application range and high practicability.

This invention provides a method and system for predicting vehicle speed in commercial vehicles using the E-Power architecture, relating to the field of commercial vehicle speed measurement technology. First, vehicle operating data is collected via hardwired and CAN bus lines. Second, the PCA method is used to extract features from the collected vehicle operating data, obtaining variables highly correlated with vehicle speed, which serve as input to the speed prediction model, improving computational efficiency. Finally, a speed prediction model is established based on a recursive fuzzy neural network and a multi-step prediction strategy, achieving accurate prediction of vehicle speed during operation and improving fuel economy and driving comfort.

The invention belongs to the technical field of traffic detection, and particularly relates to a roadside traffic monitoring method and system based on a single millimeter-wave radar, and the system comprises a data collection module, a millimeter-wave point cloud extraction and enhancement module, a traffic flow statistics module, a vehicle speed estimation module, and a three-dimensional imaging module. By means of the characteristics of all weather, strong anti-interference capability, no need of illumination, non-contact perception and the like of millimeter wave signals, the system can still stably operate in foggy days, nights and complex traffic environments, and the application scene is wider. The influence of shielding between vehicles is effectively relieved by introducing a space-time diversity mechanism, an anchor point type speed measurement method is proposed, the imaging resolution is considered while the speed measurement precision is ensured, and high-precision three-dimensional reconstruction is realized by combining an efficient imaging optimization model and an enhanced representation and structure guiding strategy. Multi-dimensional road traffic perception data can be formed by acquiring the number of vehicles, the running speed of the vehicles and the three-dimensional imaging information of the vehicles, so that basic data support is provided for an intelligent traffic system.

A vehicle assembly is disclosed comprising a vehicle member and a speed measuring arrangement for measuring a rotational speed of the vehicle member. The speed measuring arrangement comprises a set of elements arranged at a portion of the vehicle member and being configured to rotate in a first plane upon rotation of the vehicle member. The speed measuring arrangement further comprises a speed sensor unit comprising an end section facing the portion of the vehicle member from a first side of the first plane. The speed sensor unit comprises a Hall sensor arranged at the end section. The present disclosure further relates to a transmission unit comprising a vehicle assembly and a vehicle.

The present disclosure relates to methods, apparatuses, devices, and program products for measuring speed. The method comprises acquiring, from a pressure sensor of an electronic device, first pressure information of the electronic device at a first moment when the electronic device is in a stationary state. The method further comprises acquiring, from the pressure sensor, second pressure information of the electronic device at a second moment when the electronic device is in a moving state. The method further comprises acquiring, from an acceleration sensor of the electronic device, acceleration information of the electronic device. In addition, the method comprises determining, based on the first pressure information, the second pressure information, and the acceleration information, an absolute speed of the electronic device at the second moment. By means of the method disclosed herein, the absolute speed of the electronic device can be accurately measured based on the pressure sensor and the acceleration sensor of the electronic device, thereby making the speed measurement more accurate and simple.

The invention discloses a target distance and speed measurement system and method based on a direct detection laser radar compatible with software radio, and belongs to the technical field of target distance and speed measurement. According to the invention, the problems of low utilization rate of echo light power, complex structure, crosstalk of microwave and optical frequency signals, and low precision of distance measurement and speed measurement in the prior art are solved. According to the improved direct detection laser radar structure compatible with the software radio provided by the invention, a radio frequency signal can be demodulated from echo signal light of the laser radar only by a single square-rate photoelectric detector, so that the structure is simpler; and the frequencies for transmitting and receiving the microwave radio-frequency signals are different, so that the microwave crosstalk of the transmitting end and the receiving end is avoided. Due to the fact that the receiving and transmitting separated optical antenna is adopted, crosstalk of optical frequency signals can be eliminated. Moreover, the method effectively improves the measurement precision of the target distance and speed. The method can be applied to target distance and speed measurement.

The application discloses a data acquisition method applied to dynamic train wheel out-of-roundness measurement, and comprises the following steps: after a train wheel enters a measurement area, continuously shooting the image of a wheel axle end cover information plate of the measured train wheel through a camera, calculating the displacement of the train wheel in unit time through image processing, and adjusting the sampling frequency of the camera by comparing the actual sampling point number with the theoretically calculated sampling point number. The application utilizes the universality of the camera speed measurement, can effectively overcome the error caused by the magnetic steel in the speed measurement of different grades, especially in the case of trains passing through different speed grades on the line, the accuracy of the train speed is more prominent, and the problem of insufficient real-time performance of the magnetic steel speed measurement can be effectively overcome. The PLC is used for rapidly triggering the camera, and the speed is updated once for each triggering of the camera. Even if the train speed changes, the speed can be adjusted and updated in time through each triggering of the camera, so that the accuracy of the system can be ensured.

A method for attenuating interference in the measurement of an angle of sideways tilt of a motorized two-wheeled vehicle including an electronic control unit configured to compute an angle of sideways tilt of the vehicle from the measurements of a tilt sensor. The method includes: reception of the value of the speed of the vehicle measured by the speed-measuring module; reception of the number of revolutions per minute of the engine; computation of the ratio between the received speed value and the received number of revolutions per minute; comparison of the ratio between the received speed value and the number of revolutions per minute with an attenuation interval; if the ratio is outside the attenuation interval, computation of the tilt angle without attenuation; if the ratio is within the attenuation interval, computation of the tilt angle with attenuation.

The present disclosure provides a motor rotating speed measurement method and device, vehicle, medium and program product, and relates to the technical field of vehicles, and comprises the following steps: determining a multi-phase current in a winding of a motor, and analyzing the multi-phase current to determine a current period and / or a current frequency of the multi-phase current; and obtaining the rotating speed of the motor according to the current period or the current frequency, without the need to additionally set a speed measurement device, thereby reducing the measurement cost, or in the case of a speed measurement device failure, the rotating speed of the motor can also be measured, and the reliability of the rotating speed measurement is improved.

The application relates to a test method, device, test equipment and storage medium of an inductive loop system. The method comprises the following steps: obtaining a rotor position of a rotating motor as a reference position, a certain length of a transmitting antenna is installed on the rotor; when the transmitting antenna rotates relative to a cross inductive loop, an envelope signal of the cross inductive loop is obtained, a position of a carrier generating unit in the cross inductive loop is obtained as a test position according to the envelope signal, the carrier generating unit comprises the transmitting antenna, the cross inductive loop is laid on the inner wall of a stator of the rotating motor in a splicing mode, the gaps between adjacent cross inductive loops and the rotor are different, a test result of a positioning function of the inductive loop system is obtained by comparing the reference position and the test position, and a test result of a speed measurement function of the inductive loop system is obtained according to waveforms of the envelope signals under different rotor speeds.

The invention relates to a speed measuring device and method based on a spatial light modulator, and the device comprises a single-mode laser, a beam-expanding collimation module, the spatial light modulator, a 4F system, a projection convex lens, a receiving convex lens, and a photoelectric detector. The beam expanding and collimating module is used for receiving a laser beam output by the single-mode laser and emitting the laser beam to the spatial light modulator after beam expanding and collimating; the spatial light modulator diffracts incident light and generates first-order diffracted light with alternately dark and bright stripes; the 4F system receives the first-level diffraction light, filters the first-level diffraction light and outputs the filtered first-level diffraction light to The projection convex lens vertically irradiates the filtered first-order diffraction light to the surface of an object to be measured, and the stripe change direction of equidistant light and shade alternated stripes in the first-order diffraction light is consistent with the motion direction of the object to be measured; the photoelectric detector receives part of scattered light carrying the speed information of the to-be-measured object based on the receiving convex lens and converts the scattered light into an electric signal so as to calculate the speed of the to-be-measured object.

The application belongs to the technical field of tower crane equipment, and particularly relates to a tower crane rotary limiting structure based on multiple redundant protection devices, which synchronously monitors rotary speed and angle through a pure mechanical structure, and provides ultimate protection when an electronic limiting system fails. A rotary speed measurement module utilizes centrifugal pendulum hammers to sense rotary acceleration, and the hammers break through a threshold to trigger linkage when overspeed occurs; an angle measurement module is based on the precise cooperation of a threaded track and a sliding groove, and generates a radial gap to trigger falling braking when the angle exceeds 540 degrees. The two modules share a braking execution mechanism, forming a double-signal redundant barrier.

The utility model discloses a forklift driving safety control device which comprises a cab and a vehicle-mounted safety driving host arranged on a center console in the cab. A portal frame is mounted in front of the outside of the cockpit, and a pallet fork is mounted on the portal frame; the vehicle-mounted camera is mounted right above a driver's seat, a mounting seat is fixed on the inner wall of a cab close to the driver's seat, an alcohol detector is arranged in the mounting seat, and the seat pressure sensor is mounted below the driver's seat; the safety prompt module is installed in a cockpit, and the alarm module is installed outside the cockpit. The vehicle-mounted safe driving host is integrated with a microprocessor, the signal output ends of the vehicle-mounted camera, the alcohol detector, the seat pressure sensor and the speed measurement sensor are respectively connected to the signal input end of the microprocessor, and the control end of the microprocessor is respectively connected to the controlled ends of the safety prompt module, the alarm module and the vehicle brake module.

Systems and methods for analyzing laser beam characteristics in high-speed laser motion systems, wherein the characteristics include laser travel speed, velocity, and acceleration, wherein the high-speed laser motion systems comprise a laser for generating a laser beam, comprising determining a location of the first pin-hole sensor within the predetermined field of view; determining a location of the second pin-hole sensor within the predetermined field of view; defining a travel distance of the laser beam; measuring the amount of time to travel from the location of the first pin-hole sensor to the location of the second pin-hole sensor; and dividing the travel distance by the amount of time to travel from the location of the first pin-hole sensor to the location of the second pin-hole sensor to calculate the velocity of the laser beam between the first pin-hole sensor and the second pin-hole sensor.

The invention discloses a high-speed motor full-speed-domain high-precision speed measurement method based on a gear encoder, and belongs to the technical field of high-speed motor control. The method comprises the steps that a gear encoder is coaxially installed at the shaft end of a motor, integer position pulses are obtained through an enhanced orthogonal encoding pulse module, decimal position pulses are obtained through an enhanced capturing module, and rotor mechanical position pulses are calculated by combining the integer position pulses and the decimal position pulses. And calculating a single-interrupt period position pulse increment through a main interrupt program, performing multi-period accumulation, and calculating the rotating speed of the motor in real time based on an accumulation result. According to the method, through a continuous interruption accumulation algorithm, integer and decimal position pulse information is fully utilized, truncation errors and random errors in a traditional pulse measurement method and a time measurement method are effectively reduced, high-precision and fast-response speed measurement of the high-speed motor in the full-speed domain range is achieved, and the method is suitable for a high-speed control system with the speed of more than 60000 revolutions per minute and has a wide application prospect. The system has the advantages of simple structure, strong anti-interference capability and low software and hardware overhead.

The utility model discloses an electric motorcycle. The electric motorcycle comprises a frame, a walking system and a braking system. The walking system comprises walking wheels, and at least part of the walking wheels are arranged below the frame. The brake system comprises a brake disc coaxially connected with the walking wheels and brake calipers matched with the brake disc. The brake disc is provided with an annular speed measurement area, the annular speed measurement area and the walking wheel are coaxially arranged, a plurality of speed measurement holes which are sequentially and evenly distributed in the circumferential direction of the brake disc are formed in the annular speed measurement area, and the two ends of each speed measurement hole are connected with the edge of the annular speed measurement area in the radial direction of the brake disc. A plane parallel to the brake disc is defined as a brake transverse reference plane, and the orthographic projection of the brake calipers and the orthographic projection of the annular speed measurement area in the brake transverse reference plane are at least partially overlapped. Through the above arrangement, the measurement precision of the real-time speed of the electric motorcycle can be improved.

The invention provides a calibration method, system and device of an inertial measurement unit, and a control device. The calibration method comprises the following steps: acquiring measurement data of the inertial measurement unit; determining a relationship between a null offset of the angular velocity meter and the temperature based on the second angular velocity measurement and the second temperature measurement; the first angular velocity measurement value and the second angular velocity measurement value are processed based on the relation between the zero offset of the angular velocity meter and the temperature, and the first angular velocity measurement value after the zero offset of the angular velocity meter is removed and the second angular velocity measurement value after the zero offset of the angular velocity meter is removed are obtained; acquiring attitude change information of the inertial measurement unit between two adjacent standing states; based on the attitude change information and the target angular velocity measurement value, the scale error of the angular velocity meter and the assembly error of the angular velocity meter are obtained to complete calibration of the angular velocity meter of the inertial measurement unit, and when calibration parameters of the angular velocity meter are calibrated by the method, the influence of temperature drift on the calibration result can be eliminated, and the calibration accuracy is improved. And the measurement result of the subsequent inertial measurement unit is improved.

The invention relates to a manufacturing method (100) for an electronic trajectory control device for a vehicle. The manufacturing method (100) comprises synchronizing measurements of the rotational speeds of each of the vehicle's wheels at initial times. The manufacturing method (100) comprises determining a first set of trajectory parameters at these initial times. The manufacturing method (100) comprises developing (101) candidate programs for the electronic trajectory control device by machine learning from the first set of parameters and the synchronized measurements of the rotational speeds of each of the wheels. (Fig. 1)

The invention relates to the field of unmanned aerial vehicle perception and SLAM, in particular to an unmanned aerial vehicle three-dimensional modeling system based on a two-dimensional laser radar and multi-height rotary scanning. Comprising a two-dimensional laser radar module, an attitude measurement module, a height and speed measurement module, a time synchronization module, a point cloud processing module, a multi-layer scanning control module, a mapping and optimization module and an uncertainty processing module. Forming a global consistent three-dimensional point cloud through strict SE (3) coordinate transformation and point-by-point distortion removal processing; according to the system, IMU and optical flow sensor data are fused, an intra-layer 2D SLAM and interlayer registration and pose map closed-loop optimization algorithm is adopted, high-precision three-dimensional modeling is achieved, and compared with a traditional scheme, the system has the advantages of being light in weight, low in power consumption and low in cost, is not sensitive to illumination and texture, and is particularly suitable for surveying and mapping, routing inspection and navigation application in indoor and weak texture environments.

The application relates to the technical field of marine environment monitoring, and discloses a marine environment multi-parameter monitoring buoy, which comprises a base, a CTD sensor arranged at the underwater position of the base and internally integrated with a wave sensor; a support, a wind direction and speed sensor, an air pressure sensor and an air temperature and humidity sensor being mounted at the top of the support; a photovoltaic panel angle adjusting module; a photovoltaic panel frame; a cleaning assembly; and a self-adaptive angle adjusting module. The longitudinal rotating scraper is separated from seawater after rotating, so that the long-term immersion of the scraper in seawater is avoided, the corrosion of the scraper is accelerated, meanwhile, the biological organisms such as barnacles in the seawater cannot be attached and grown on the surface of the scraper, and the service life of the scraper is prolonged. The space posture of the mounting disc is adjusted through the cooperation of the telescopic adjustment, the corresponding push rod is driven to independently extend and retract, the mounting disc always keeps a dynamic horizontal state when the buoy swings with waves, and the requirements of the meteorological observation specification on the wind direction and speed measurement accuracy are met.

The application discloses an intelligent radio signal velocity measurement method and system, and belongs to the radio processing field.The method comprises radio signal preprocessing, cooperative situation state updating, sampling point distortion kernel design and radio velocity measurement.A cooperative situation vector is defined, clock error design is based on, the cumulative influence of clock bias with time is quantified, systematic errors are eliminated from the source, the basic precision of frequency offset calculation is improved, an acceleration feedback correction state transition matrix is introduced, dynamic tracking capability is improved, radio signal velocity measurement precision is further improved, a customized distortion kernel design is used to accurately describe dynamic non-uniform distortion and improve distortion compensation precision, a focused frequency band is determined based on a frequency offset trajectory, real-time performance is improved, an error feedback iteration velocity measurement mechanism is designed to accelerate convergence, enhance noise resistance and further improve radio signal velocity measurement reliability.