184 results about "Three axis accelerometer" patented technology

The invention relates to an AI server cooling water pump vibration quantity self-adaptive calibration test method and system, an intelligent test platform integrates a six-dimensional force sensor and a temperature compensation vibration exciter, the platform rigidity is automatically calibrated, a water pump-pipeline system transfer function is obtained, and a rotating speed-lift-modal frequency three-dimensional mathematical model is established; a three-axis MEMS accelerometer array is arranged at sensitive parts such as a water pump bearing seat and a motor shell, and vibration, current and pressure signals are synchronously collected; carrying out time-frequency domain signal processing by adopting variational mode decomposition in combination with self-adaptive S transformation, and extracting a 128-dimensional full-frequency domain feature vector containing a modulation side frequency band; effective values of vibration acceleration, speed and displacement are calculated through a frequency domain integration algorithm, and current harmonic interference is corrected through an electromagnetic vibration compensation model; and finally, a vibration health degree evaluation model containing 18 characteristic parameters is established based on a support vector machine, the test system comprises an intelligent test platform unit, a multi-source sensing unit, an edge calculation unit and a data management unit, and microsecond-level synchronous acquisition and GB-level data throughput are realized through a time sensitive network. And online incremental learning and automatic generation of a test report are supported. The method has the effect of improving the water pump vibration quantity test precision.

A system (1) for efficiently determining a driving behaviour of a driver driving a vehicle. The system includes a 3-axis accelerometer (2) generating accelerometer data (3), a direction sensor (4) generating direction data (5) and orientation sensor (6) generating orientation and angular velocity data (7), all placed inside the vehicle. The system (1) also includes a processing unit (8) which processes the accelerometer data (3), the direction data (5) and the orientation data (7), and calibrates the accelerometer data (3) to generate a calibrated accelerometer data (9). The calibrated accelerometer data (9) is used in determining the driving behaviour of the driver of the vehicle and generate Driving Deficiency Alerts, including but not limited to Over-speeding. Hard acceleration. Sudden Braking, Fast Cornering, Quick Lane Changing, Distracted Driving, Dangerous Driving over bumps and Crash Detection.

Various optical systems for use in a light pulse atomic interferometer (LPAI)-based one-, two-, or three-axis accelerometer or gyroscope are disclosed. As an LPAI accelerometer or gyroscope may employ many different laser beams to implement the LPAI functionality, ways of combining these different laser beams to thereby simplify the optical systems are desired. The cooling laser beam portion of the optical system may be simplified using one or more reflective grating chips. The Raman laser beam optics may be simplified using combiners and separators. For LPAI systems sensing along three axes, various optical switching schemes may be employed, including ones that generate variable data-rates with a primary sensing axis having a higher data-rate than the secondary sensing axes. Further, by combining various laser beams in a time-multiplexed manner, the number of optical fiber tethers to a sensor head may be reduced.

The invention provides a speedometer sideslip online compensation integrated navigation method based on FPGA (Field Programmable Gate Array) hardware acceleration. Relates to the technical field of train navigation positioning. According to the SINS / DR integrated navigation system, an IMU inertial measurement unit is integrated in an SINS inertial navigation module and specifically comprises a three-axis gyroscope and a three-axis accelerometer, in SINS / DR integrated navigation, mapping from sensor data of the gyroscope, the accelerometer, an odometer and the like to a slip mode is achieved by adopting a Sheng differential equation model, and the SINS / DR integrated navigation system is obtained. Two speedometers are installed on non-steering wheels on the two sides respectively, a speedometer speed error model is established to compensate and correct the actual speed, and acceleration of a Kalman filtering algorithm is achieved through an FPGA.

A comprehensive system designed for the predictive maintenance of railcar wheel bearings, integrating multiple sensor modalities. The system includes thermography for temperature mapping, vibration analysis via a three-axis accelerometer, rotational velocity measurement using a rate gyro, and optical spectrometry for lubricant analysis. Each modality contributes to a holistic understanding of bearing health, enhancing maintenance strategies, safety, and operational efficiency in rail transportation.

The present application relates to a sensor-weight system for an exercise machine. The system comprises a load cell, a three-axis accelerometer, a battery, a housing, a communication unit, a data processing unit, and a weight stack with multiple weights. The load cell interconnects a cable with the weight sword of the weight stack, allowing precise measurement of the user's exerted force during exercise.

The invention is a system for continuous monitoring of respiratory and gastric functions using wearable devices. Each device includes a three-axis accelerometer and optionally a gyroscopic sensor. They feature wireless communication for data transmission and means for attachment to the skin. A computation device analyzes the data, using a machine learning model to detect coughing, swallowing and respiration. The method involves placing sensors on the skin of the cricoid region and epigastric region, filtering and transmitting data, training the model, and plotting coughing frequency. This system enhances detection accuracy and facilitates early medical interventions, benefiting chronic condition management and postoperative care.

The invention discloses an underground coal mine directional inclinometry integrated gyro attitude instrument and a measurement method. The underground coal mine directional inclinometry integrated gyro attitude instrument comprises a shell, a three-axis MEMS gyro, a three-axis MEMS accelerometer, a main control board, a battery module, a communication module, a charging interface, a communication interface, a base, a satellite injection module, a communication cable winch and an orifice handheld end. The small-size structural design is achieved through the MEMS gyroscope and the MEMS accelerometer, the low-power-consumption standby time is long, drilling machine tapping orientation and drilling track measurement can be conducted, the feasibility is high, and the reliability is high; improved initial alignment is adopted, the algorithm comprises coarse alignment and kalman filtering fine alignment, the process comprises data storage calculation and real-time sampling calculation, the alignment time is shortened to the maximum extent, the alignment precision is improved, and meanwhile, full-space high-precision orientation is achieved based on satellite injection parameters; in the process of dynamic tracking in and out of an attitude instrument hole, a communication cable winch is used for controlling the attitude instrument to carry out zero-speed correction, the dynamic accumulative error of the attitude instrument is corrected, and the track measurement precision is improved.

The invention provides a triaxial accelerometer based on a four-degree-of-freedom weak coupling resonator, the triaxial accelerometer comprises an upper-layer structure and a lower-layer structure, the upper layer is a micromechanical sensitive element constructed by taking silicon as a material, the lower layer is a glass base processed by a silicon dioxide material, and the glass base is used for providing mechanical support and electrical isolation functions. Wherein the micromechanical sensitive element has a signal conversion function; and the lower-layer glass base is formed by wet etching and metal sputtering processes and is used for signal output. On the basis of collaborative design of the orthogonally distributed resonance unit array and the mechanical amplification mechanism, electrostatic driving and amplitude ratio detection are combined, synchronous and accurate sensing of acceleration of the Y axis, the X axis and the Z axis is achieved through a single sensitive element, the technical limitation of a traditional single-axis detection mode is broken through, the complexity of a rear-end signal processing circuit is reduced, and the detection precision is improved. The device space utilization rate is improved.

The invention discloses an MEMS three-axis gyroscope thermal drift error calibration method based on segmented calibration, which comprises the following steps: forming an inertial system by using a three-axis accelerometer and a gyroscope, rotating an inertial unit according to a designed rotation scheme by using a low-cost indexing mechanism, and collecting data of the three-axis gyroscope and the accelerometer in a temperature rising process; and carrying out segmentation processing on rotation data in the temperature rise process, calibrating each piece of segmented data in a proposed 24-dimensional system state, and finally obtaining a zero-offset temperature drift curve of the MEMS gyroscope and a temperature drift curve of a non-orthogonal transformation matrix component. According to the method, the application precision of the MEMS three-axis gyroscope is improved, the calibration cost is reduced, and the positioning precision of intelligent mobile terminals such as an unmanned aerial vehicle and a mobile robot can be improved.

The invention discloses a gastrointestinal decompression nursing device and a gastrointestinal tract pressure supervision system, and belongs to the technical field of medical nursing. A gastrointestinal decompression nursing device comprises a suction tank, a regulation and control box, a stomach tube and a flexible arm band, and the regulation and control box comprises a data preprocessing module and a control module; a plurality of flexible resistance type sensors are distributed in the flexible arm band at equal intervals, an in-vivo capsule is arranged at the front end of the stomach tube, and a pressure sensor and a three-axis accelerometer are arranged in the in-vivo capsule. According to the gastrointestinal nursing pressure reducer, the problem that an existing gastrointestinal nursing pressure reducer cannot achieve pressure nursing and supervision work according to different patients is solved, the in-vivo capsule is integrated with the pressure sensor, the triaxial accelerometer and the impedance sensor, and the pressure in an intestinal tract cavity, the peristalsis frequency and the content impedance can be synchronously collected; in combination with body surface pressure gradient data of the flexible arm band, improper treatment caused by misjudgment is avoided, and serious complications such as intestinal perforation and bleeding caused by delayed treatment are avoided.

The invention provides a method, a program and equipment for calibrating installation error angles of two inertial navigation systems based on accelerometer information and a storage medium. Performing multi-angle conversion on the structure provided with the two inertial navigation systems, acquiring a data matrix output by the triaxial accelerometers of the two inertial navigation systems within a period of time at each angle, and calculating the specific force of the two inertial navigation systems; based on the specific force data sets of the two inertial navigation systems, constructing a to-be-optimized information matrix about the installation attitude error angle by utilizing a physical relation equation; decomposing the information matrix to be optimized, calculating an optimal coordinate transformation matrix according to the decomposed matrix, and calculating a pitching installation error, a rolling installation error and a course installation error between the two inertial navigation systems according to elements in the optimal coordinate transformation matrix. According to the method, the defects of a self-alignment method and a transfer alignment method can be overcome, high-precision rapid calibration of the installation error angle between the two inertial navigation devices can be realized, and the method has practical engineering application significance.

The utility model relates to the field of spinning drum unloading machines, and discloses a drum unloading machine inclination early warning and scale calibration device, a weighing plate is arranged on the surface of the upper end of a horizontal plate in a suspended manner, a weighing sensor is mounted at the lower end of the horizontal plate, the weighing plate is connected with the weighing sensor, a three-axis MEMS gyroscope is mounted on the outward side of a first grabbing plate, and a second grabbing plate is mounted on the outward side of the first grabbing plate. A three-axis MEMS accelerometer is installed on the outward side of the second grabbing plate, a barrel unloading gripper is arranged on the barrel unloading machine, the barrel unloading gripper comprises a horizontal plate, a first grabbing plate and a second grabbing plate, the first grabbing plate and the second grabbing plate are arranged at the left end and the right end of the horizontal plate, and a weighing plate is arranged on the surface of the upper end of the horizontal plate in a suspended mode. A weighing sensor is installed at the lower end of the horizontal plate, the weighing plate is connected with the weighing sensor, a three-axis MEMS gyroscope is installed on the side, facing outwards, of the first grabbing plate, and a three-axis MEMS accelerometer is installed on the side, facing outwards, of the second grabbing plate.

The invention provides a high-precision subminiature inertial measurement combination based on an MEMS device, and relates to the technical field of MEMS inertial measurement combinations. According to the inertial measurement combination, a three-axis MEMS accelerometer chip and three single-axis MEMS gyroscope chips are respectively arranged on a rigid printed board, and acquired angular velocity information and acceleration information are respectively transmitted to the rigid printed board on which a processor chip is positioned through a flexible printed board; and working software embedded in the processor chip outputs the processed acceleration information and angular velocity information through an external electrical interface according to a system error model. The cable-free information processing circuit is formed in the mode, the system structure miniaturization problem in a limited space and the MEMS chip low-stress orthogonal installation problem can be solved, MEMS devices conduct information interaction, the utilization rate of the limited space of an inertial measurement combination can be effectively increased, cable installation space does not need to be reserved, and the cost is reduced. Therefore, the inertial measurement combination achieves the miniaturization effect.

A smart walking cane may include a smart cane, a smart device, and a smart software. The smart cane has a cane body, and a cane handle is formed on the top of the cane body to be held by the user. The cane body comprises a nine-axis inertial sensor, a pressure sensor, and a photoelectric sensor. The nine-axis inertial sensor has a three-axis accelerometer, a three-axis gyroscope, and a three-axis magnetometer, and the three-axis accelerometer is used to detect the gravitational acceleration of the smart cane along the X, Y, and Z axes, allowing for the detection of movement speed, step count, and whether the user's hand has tremors while using the smart cane.

A monitor device (6) for coupling to a sensor assembly of an ostomy appliance is disclosed. The monitor device comprises a housing, a processor arranged in said housing, and an appliance interface configured for coupling the monitor device to the sensor assembly. The appliance interface comprises a plurality of terminals for connecting with a plurality of electrodes of the sensor assembly. Further, the monitor device comprises a three-axis accelerometer (540) configured to generate a position signal. Further, a method for determining a rotational offset of a sensor assembly relative to an ostomy and a system comprising a monitor device and a sensor assembly is disclosed.

The invention discloses an integrated fusion navigation system based on an MEMS (Micro Electro Mechanical System) and an optical fiber gyroscope. The integrated fusion navigation system comprises a triaxial optical fiber gyroscope, a triaxial accelerometer, a triaxial MEMS gyroscope, a triaxial MEMS accelerometer, a GNSS (Global Navigation Satellite System) satellite navigation module, a first navigation module and a second navigation module, the data output ends of the three-axis fiber-optic gyroscope and the three-axis accelerometer are connected with the first navigation module, the data output ends of the three-axis MEMS gyroscope and the three-axis MEMS accelerometer are connected with the second navigation module, and the data output end of the GNSS satellite navigation module is connected with the first navigation module and the second navigation module at the same time. The first navigation module and the second navigation module are mutually connected; and the first navigation module and the second navigation module are connected to calculate the received data respectively and then output navigation data respectively. According to the invention, the problem that accurate navigation cannot be realized when a single sensitive element breaks down can be solved.

The invention belongs to the field of printers, and particularly relates to a printer and an automatic leveling method of the printer, a three-axis accelerometer is additionally arranged on a main control board, a structure used for supporting a printer body is designed to be of a three-point supporting type, the height of a fixed supporting leg is fixed, and the height of an adjustable supporting leg can be adjusted by rotating a supporting screw. A main motor in the printer body is used as a power source, the supporting screw of each adjustable supporting leg is connected with the main motor through a clutch and a transmission mechanism, and the main control board can transmit power of the main motor to the supporting screw for rotation through IO control. The main motor supports direction / rotating speed switching, independent lifting of the two adjustable supporting legs can be achieved through the clutch, in addition, the inclination condition of the printer body can be obtained through the three-axis accelerometer through a posture algorithm, the posture of the printer body can be automatically leveled by combining the two points through the main control board, and stable and horizontal arrangement of the printer is achieved.

The invention discloses an inclinometer magnetic interference error compensation method, system and device and a medium, and relates to the technical field of measurement while drilling, the method comprises the following steps: obtaining triaxial accelerometer data and triaxial magnetometer data collected by a plurality of preset azimuth angles of an inclinometer; performing magnetic interference preliminary correction on the data of the three-axis magnetometer by using a multi-measuring-point analysis method to obtain a preliminary correction azimuth angle; inputting the triaxial accelerometer data and the triaxial magnetometer data into a pre-trained error compensation model ICGO-RELM, and outputting a magnetic interference error compensation value; and compensating the initial correction azimuth angle based on the error compensation value to obtain final azimuth angle data. And the solving precision of the underground azimuth angle is improved.

The present disclosure provides a kind of inertial motion measurement double-axis rotation excitation enhancement method and system based on observability analysis.First, the system state space model of introducing double-axis rotation mechanism is constructed, the normalized observability analytical expression of sensor error under zero speed condition is derived based on Gramian matrix eigenvalue decomposition;Accordingly, the attitude condition of error observability maximization is determined, and the optimal rotation excitation strategy including a series of optimal observation positions is set;In the process of inertial navigation positioning assisted by zero speed update ZUPT, in non-zero speed interval, based on the optimal rotation excitation strategy, the IMU is sequentially guided to each optimal observation position by controlling double-axis rotation mechanism, to solve the problem of low error state observability caused by single carrier attitude in zero speed correction.The present application can realize full state high-precision estimation of three-axis accelerometer bias and gyroscope zero bias, effectively improve the precision and robustness of autonomous motion measurement in complex environment.

The invention relates to the technical field of hoisting machinery safety monitoring and control, and particularly discloses a portal crane moment limit protection method and system based on current verification. Real-time detection signals of a hoisting mechanism are obtained through a moment sensor, and a three-axis accelerometer is arranged at the connecting position of a steel wire rope to obtain swing signals; analyzing a jitter interference factor based on the steel wire rope jitter displacement, and judging the accuracy of a detection signal; on the premise that the signal is accurate, operation state detection of primary mechanical power calculation is carried out, then secondary operation state detection is carried out by combining the rated working current of the lifting frequency converter calculated by the detection signal and the real-time working current collected by the PLC, and the lifting mechanism is controlled to operate according to the detection result. Through multi-dimensional signal fusion and secondary verification, the detection precision and the overload judgment reliability are improved, the overload operation of equipment can be effectively prevented, and the operation safety of the crane and the service life of the equipment are guaranteed.

An asset tracker for detecting an end of trip by an asset tracker are described. An end of trip may be detected using a Global Navigation Satellite System (GNSS) module or an Inertial Measurement Unit (IMU), such as a three-axis accelerometer. In some implementations, the asset tracker uses the IMU for end of trip detection. In other implementations, the asset tracker uses the IMU for impact detection while using the GNSS module for end of trip detection.

The invention discloses a blasting engineering monitoring system and method based on expansion type blasting vibration measurement piles, and relates to the technical field of mine blasting monitoring, and the blasting engineering monitoring system comprises a plurality of expansion type blasting vibration measurement piles and a visual tracking module; the unfolding type blasting vibration measuring pile comprises a center rod and an unfolding part arranged outside the center rod in a sleeving mode. A synchronous clock module and a cache unit are arranged in the center rod, and a triaxial accelerometer and a mark point are arranged at the two ends of the center rod respectively; the unfolding part comprises a plurality of unfolding type supporting sheets, and pressure sensors are arranged at the root parts of the unfolding type supporting sheets in a coupling manner; a strain gauge is arranged in a gap position between every two adjacent expansion type supporting sheets, and the strain gauges are electrically connected with the cache unit; and the strain gauge clings to the wall of the drill hole. The device is compact in structure and accurate in measurement, and can efficiently and reliably provide real-time data support and safety early warning decision basis for blasting engineering.

The invention provides a vehicle state identification method and device based on a triaxial accelerometer, equipment and a medium, and relates to the technical field of automotive electronics. The method comprises the following steps: a calibration stage: calculating and storing an initial attitude angle theta1 representing a horizontal static state of a vehicle; a data acquisition stage: calculating a real-time attitude angle theta2 representing the real-time state of the vehicle; a deviation value calculation stage: calculating an attitude deviation value delta theta based on the initial attitude angle theta 1 and the real-time attitude angle theta 2; in the vehicle state recognition and decision-making stage, at least one set of posture deviation threshold values are preset, the posture deviation value delta theta is compared with the posture deviation threshold values, meanwhile, at least two whole vehicle state signals are obtained through a vehicle communication interface, and the vehicle state recognition and decision-making stage is carried out on the basis of the comparison result of the posture deviation value delta theta and the posture deviation threshold values and the whole vehicle state signals. And comprehensively judging the current state of the vehicle. According to the invention, reliable and accurate identification of the vehicle state can be realized with extremely low cost through the triaxial accelerometer, and the false triggering rate is significantly reduced.

The application belongs to the technical field of music frequency point adjustment, and discloses an EQ frequency point self-adaptive adjustment method, device, equipment and storage medium, the method comprises the following steps: constructing a music database; detecting the music sound wave of the current music emitted by the audio generator by using a three-axis accelerometer, and obtaining a third three-axis change value of the music sound wave; comparing the third three-axis change value of the music sound wave with the range of the first three-axis change value in the music database, and determining the music type of the current music; detecting the music sound wave in real time by using the three-axis accelerometer, obtaining a fourth three-axis change value, and determining the real-time frequency EQ gain of the music sound wave according to the fourth three-axis change value; adaptively adjusting the EQ frequency point according to the music type, and adjusting the EQ playing gain according to the real-time frequency EQ gain; the music effect of sound playing is greatly improved, and the problem that the EQ frequency point value cannot be adaptively adjusted in real time according to the sound effect category of the current song is solved.

The invention discloses a time division multiplexing three-axis accelerometer reading circuit, which relates to the field of reading circuits, and comprises a signal conditioning module and an electrostatic force feedback module, and in the Nth working period of the reading circuit, an X-axis acceleration sensor, a Y-axis acceleration sensor and a Z-axis acceleration sensor in a three-axis accelerometer are respectively used as detection axis acceleration sensors to be connected with the signal conditioning module. For any shaft acceleration sensor, when the acceleration sensor is a detection shaft acceleration sensor of the Nth work period, the electrostatic force feedback module provides feedback voltage for the acceleration sensor and samples the feedback voltage; when the acceleration sensor is converted into a non-detection-axis acceleration sensor from the detection-axis acceleration sensor in the Nth work period, the electrostatic force feedback module provides feedback voltage sampled in the Nth work period for the acceleration sensor until the acceleration sensor is the detection-axis acceleration sensor in the (N + 1) th work period, the accelerometer reading circuit has the characteristics of high precision, low power consumption and small circuit area.

A system and method for avoiding unintended acceleration is provided and includes a first integrated circuit-based electronic controller configured to receive acceleration and brake requests and provide a control output via a datalink dedicated to controlling a prime mover system of the vehicle, a three-axis accelerometer configured to provide acceleration outputs indicative of acceleration of the accelerometer relative to three dimensions, and a second integrated circuit-based electronic controller operative independently of the first integrated circuit-based controller configured to receive the acceleration and braking requests, receive the acceleration outputs of the three-axis accelerometer, and operatively coupled with the datalink. The second integrated circuit-based electronic controller is configured to determine an unintended acceleration event in response to the acceleration and braking requests, and the acceleration outputs of the three-axis accelerometer.

The present invention proposes a measurement system and method for gravity acceleration and positioning orientation, the system includes a measurement module and a calculation control module, the calculation control module obtains the first signal output by a small-range three-axis accelerometer, the second signal output by a medium-range three-axis accelerometer, the third signal output by a three-axis fiber optic gyroscope and the vibration range of the vehicle engine and determines whether the range of the small-range three-axis accelerometer includes the vibration signal range of the vehicle engine. If it does, the calculation control module uses the third signal to correct the first signal and processes it and outputs the corrected gravity acceleration value and positioning orientation data at the same time; if it does not, the calculation control module uses the first signal and the third signal to correct the second signal and processes it and outputs the corrected positioning orientation data. Not only does it achieve the simultaneous measurement of the local gravity acceleration value and positioning orientation data, but it also has a high measurement accuracy.

The intelligent positioning and tracking device comprises a cap body, a three-axis magnetometer is fixedly connected to the front end of the left side of the cap body, a positioner is fixedly connected to the rear end of the left side of the cap body, and a three-axis accelerometer is fixedly connected to the front end of the right side of the cap body. And the rear end of the right side of the cap body is fixedly connected with a three-axis gyroscope. A worker wears the helmet body on the head, the first binding belt and the second binding belt can be firmly connected under the cooperation of the nylon velvet belt and the nylon hook belt, the three-axis accelerometer, the three-axis magnetometer, the three-axis gyroscope and the positioner are arranged, the position information of the worker can be positioned in real time, and the working efficiency is improved. A methane sensor, a carbon monoxide sensor, an oxygen concentration sensor, a temperature and humidity sensor, a dust concentration sensor and a microseismic monitoring sensor are arranged, and the methane concentration, the carbon monoxide concentration, the oxygen concentration, the temperature and humidity information, the dust concentration and the vibration condition in the environment can be detected respectively.

The invention discloses a low-cost optical fiber inertial navigation latitude-free north seeking device which comprises a frame, a fixing frame, a three-axis accelerometer assembly, a three-axis optical fiber gyroscope assembly, an algorithm processing unit and an external device. The three-axis accelerometer assembly comprises first limiting grooves formed in one side of the frame, every two first limiting grooves are perpendicular to each other, the perpendicularity does not exceed 0.01, three-axis accelerometer bodies are installed in the first limiting grooves through bolts, every two three-axis accelerometer bodies are perpendicular to each other, and the perpendicularity does not exceed 0.01. According to the optical fiber inertial navigation latitude-free north-seeking device, the accelerations of the optical fiber inertial navigation latitude-free north-seeking device in three orthogonal directions can be measured through the arranged three-axis accelerometer assembly, so that information such as the speed, the acceleration and the angular speed of the optical fiber inertial navigation latitude-free north-seeking device is calculated, and the stability of the optical fiber inertial navigation latitude-free north-seeking device during use is improved.