1923results about "Acceleration measurement using interia forces" patented technology

Various automated techniques are disclosed herein for monitoring and assessing real-time and future operational and health statuses of real-world assets (e.g., physical devices, components, equipment, structures, buildings, machines, infrastructure, piping systems, etc.). A monitoring system incorporates the use of intelligent Monitoring Devices for monitoring pipe systems and / or other infrastructure for leaks / issues using IoT devices and machine learning. One or more Monitoring Device(s) are attached to specific physical equipment / structure(s) to be monitored. A Monitoring Device performs comprehensive field data gathering. The collected field data is used to train a customized ML model, which is stored locally in that Monitoring Device. The Monitoring Device monitors current conditions of the pipe using various sensors, and uses its locally stored customized, trained model to perform real-time, edge-based analysis of the monitored data to identify possible issues in real-time and / or to predict future maintenance / service needs without relying on continuous cloud connectivity.

The invention discloses a force and acceleration composite sensor and an adjusting method, and belongs to the field of sensors. According to the technical scheme, the force and acceleration composite sensor comprises a sensor shell, an acceleration detection assembly comprises an acceleration detection core body, a first positioning face and a first pressing block are arranged in the sensor shell, the acceleration detection core body is located between the first positioning face and the first pressing block, and a screwing screw rod is arranged on the first pressing block; a first threaded hole is formed in the sensor shell, and the tightening screw is in threaded connection with the first threaded hole; the force detection assembly comprises a force detection core body, a second positioning surface and a second pressing block are further arranged in the sensor shell, the force detection core body is located between the second positioning surface and the second pressing block, and a jack assembly is arranged on the face, opposite to the force detection core body, of the second pressing block. According to the scheme, an adjustable pressing block structure is added, and adjustment of pre-pressure is achieved; and through the rigid connection mode of threaded connection, the springback phenomenon is avoided, and the pre-compression is more stable and accurate.

A user scenario-based audio playback method includes: obtaining a target user scenario that a user is currently in and user historical data; determining a plurality of pieces of candidate preset information corresponding to the target user scenario from a preset device configuration information table; calculating, based on the user historical data, a degree of scenario relevance, the quantity of playbacks and the quantity of selected times of a corresponding preset state of each candidate preset information; calculating a recommendation coefficient of each candidate preset information based on the degree of scenario relevance, the quantity of playbacks and the quantity of selected times; determining target preset information from the plurality of pieces of candidate preset information according to the recommendation coefficient; and adjusting a playback parameter of an audio device based on the target preset information and playing an audio.

The invention discloses a vehicle falling detection method and device, the method is applied to a vehicle-mounted device, and the method comprises the steps that first information is obtained, the first information comprises accelerated speeds of a vehicle in a first direction, a second direction and a third direction, and / or angular speeds of the vehicle in the first direction, the second direction and the third direction, the first direction, the second direction and the third direction are three coordinate axis directions of a three-dimensional coordinate system respectively; and then, according to the first information, determining whether the vehicle falls off or not. According to the method, in consideration of possible vehicle direction change, rolling and other situations when a vehicle falls off, falling detection is carried out on the vehicle according to acceleration of the vehicle in a first direction, a second direction and a third direction and / or angular velocity of the vehicle in the first direction, the second direction and the third direction, and the vehicle falling detection accuracy is improved. Therefore, whether the vehicle falls off or not can be determined, and the accuracy of vehicle falling detection can be ensured.

The invention discloses a method for predicting the damage of a prestressed concrete cylinder pipe in a complex environment, and relates to the technical field of pipeline structure health monitoring, and the method comprises the steps: collecting multi-physical field data through deploying multiple types of sensors, transmitting the data to a central monitoring system in a wireless manner, carrying out the standardized preprocessing, and obtaining a multi-source fusion data set; a salt migration driving index dsa, a stress disturbance induction index yry and an electrochemical activity potential index che are constructed, a comprehensive corrosion risk index SCR is obtained, and corrosion behavior evaluation is carried out. And when the corrosion behavior is evaluated as a disturbance sign, a corrosion change prediction index CAR is further calculated according to time sequence evolution forming a corrosion risk index SCR, grading evaluation and transition identification of the corrosion state are realized, an evaluation result is stored in a database, and a corrosion risk evolution trend is presented through a visual chart. The method supports early warning and emergency response decision making, and has high adaptability and engineering practicability without adding hardware.

The utility model relates to the technical field of acceleration sensors, in particular to a piezoelectric acceleration sensor, which comprises a shell, a mounting cavity is arranged in the shell, a shielding shell is fixedly connected in the mounting cavity, a crystal base is fixedly connected at the bottom end in the shielding shell, a PCB (printed circuit board) is arranged at the upper part in the shielding shell, and the crystal base is fixedly connected with the crystal base. An external force is applied along the polarization direction of the ceramic wafer to deform the ceramic wafer, the inside of the ceramic wafer is polarized, charges with opposite polarities appear on the two stressed end faces, and the ceramic wafer is recovered to an initial state if the external force is removed, so that mechanical energy is converted into electric energy by utilizing the direct piezoelectric effect of the ceramic wafer, and then the electric energy is subjected to signal processing; the sensor outputs 100mv / g alternating current voltage, so that vibration acceleration signals are measured, triangular shearing is adopted by a measuring element, a two-core shielding cable is adopted by a cable, and the sensor is small in size, light in weight and high in applicability.

Certain embodiments provide an auxiliary wireless device for a power tool that includes a body, a wireless communication unit (WCU), an inertial measurement unit (IMU), and a controller. The body is removably attachable to a housing of a power tool. The WCU includes a wireless transceiver. The IMU is configured to output IMU sensor data including at least one of 3-axis acceleration data and 3-axis angular rate data. The controller is configured to determine a loaded operational time of the power tool over a time period based on the IMU sensor data, determine a cumulative loaded operational time of the power tool over a cumulative time period based on loaded operational times for a number of time periods, and send the cumulative loaded operational time to the WCU for transmission to a remote device. The power tool is activated in a loaded condition during the loaded operational time.

A push-pull type optical fiber MEMS accelerometer based on a Michelson interferometer comprises a mechanical assembly and two sensing optical fibers, the mechanical assembly is composed of a fixed base and an acceleration sensing chip, the acceleration sensing chip comprises an external frame, a mass block and two sets of spring cantilever beams, the external frame is provided with a thin optical fiber groove, and the thin optical fiber groove is provided with an optical fiber. The mass block is provided with two convex structures serving as reflecting surfaces, and two air cavities are formed between the end face of the sensing optical fiber and the top faces of the convex structures of the mass block and serve as sensing arms of the Michelson interferometer. When the accelerometer is subjected to the action of external acceleration, the mass block moves relative to the external frame to drive the cavity lengths of the two air cavities to change in a push-pull manner, so that the optical path is changed and an interference signal is generated. Interference signals are acquired and demodulated through a photoelectric detector, a data acquisition circuit and a computer, and vibration acceleration signals can be obtained. The invention has the advantages of high sensitivity, strong common-mode noise suppression capability and the like, and is suitable for various dynamic vibration response measurement occasions.

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.

An agricultural trench depth sensing system having a trench implement adapted to be disposed in a soil trench opened in a soil surface. In one embodiment an ultrasonic sensor detects a distance to an upper surface of said trench implement or a target disposed thereon. In another embodiment, said trench implement includes one or more fingers which rotate with respect to said trench implement to detect the soil surface relative to said trench implement. In another embodiment, said trench implement includes side sensors for detecting the sidewall of the soil trench.

A yaw rate sensor and a method for operating a yaw rate sensor comprising a substrate and a double rotor are proposed, wherein the substrate has a main extension plane with an X direction and a Y direction running perpendicular thereto, wherein the double rotor has a first rotor and a second rotor which - spaced apart along the X direction and separated from one another by a central region - are elastically connected to the substrate via a respective suspension and which are elastically connected to one another via a first coupling element such that the two rotors can be excited to antiphase torsional oscillations, wherein the rotation axes of the rotors run in a Z direction perpendicular to the main extension plane of the substrate, wherein the yaw rate sensor has first detection electrodes and second detection electrodes, wherein the first rotor is connected to a first seismic mass and a second seismic mass such thatthat these are each mounted so as to be deflectable in the radial direction relative to the first rotor and substantially parallel to the main extension plane, wherein the second rotor is connected to a third seismic mass and a fourth seismic mass in such a way that these are each mounted so as to be deflectable in the radial direction relative to the second rotor and substantially parallel to the main extension plane, wherein the first seismic mass is connected to the third seismic mass via a first rocker element in such a way that the third seismic mass is deflected in a direction opposite to the radial deflection of the first seismic mass upon a radial deflection of the first seismic mass, wherein the second seismic mass is connected to the fourth seismic mass via a second rocker element in such a way that the fourth seismic mass is deflected in a direction opposite to the radial deflection of the first seismic mass upon a radial deflection of the second seismic mass,the radial deflection of the second seismic mass is deflected in the opposite direction, wherein the first and second rocker elements are elastically connected to one another via a second coupling element such that the radial deflections of the first and second seismic masses are antiparallel and the radial deflections of the third and fourth seismic masses are also antiparallel.

The MEMS triaxial accelerometer with the self-checking function comprises a cap layer, a structural layer and a substrate layer, the structural layer is clamped and packaged between the cap layer and the substrate layer, the structural layer comprises an X-axis acceleration detection array, a Z-axis acceleration detection array and a Y-axis acceleration detection array which have the self-checking function, and the X-axis acceleration detection array, the Z-axis acceleration detection array and the Y-axis acceleration detection array have the self-checking function. A Z-axis sensitive structure release groove is formed in the middle of the structural layer, the Z-axis acceleration detection array can move in the Z-axis direction along the Z-axis sensitive structure release groove, an X-axis sensitive structure release groove is formed in one side of the Z-axis acceleration detection array, and the X-axis acceleration detection array can move in the X-axis direction along the X-axis sensitive structure release groove. A Y-axis sensitive structure release groove is formed in the other side of the Z-axis acceleration detection array, and the Y-axis acceleration detection array can move in the Y-axis direction along the Y-axis sensitive structure release groove. The accelerometer provided by the invention has a self-checking function, can apply known signals, and is used for detecting the response of the sensor under different working conditions.

The invention discloses a gate fault detection method and system, and relates to the technical field of fault diagnosis and health monitoring, and the method comprises the steps: collecting a gate vibration signal, extracting a main modal frequency, setting a sampling frequency and a passband range, designing a finite impulse response filter for filtering, and carrying out the optimization through a particle swarm algorithm, thereby obtaining an enhanced signal; extracting features in the enhanced signal for integration to obtain a feature vector, mapping the feature vector to a discrete state set by using a rule threshold matching method, and obtaining a gate state; the method comprises the following steps: acquiring historical data for sampling, constructing a state transition probability matrix, calculating a steady-state probability vector according to the state transition probability matrix, combining a gate state, generating a state sequence track, setting an influence factor and a weight by using an empirical rule, and calculating a fault occurrence probability for risk detection; according to the method, the gate fault detection precision, efficiency and reliability are remarkably improved.

An inertial measurement device includes: an inertial sensor; a first signal processing circuit; a second signal processing circuit; a first communication unit and a second communication unit configured to communicate with an external device; and a mode selection unit configured to select a processing mode from a plurality of modes including a first processing mode and a second processing mode. The first processing mode is a mode in which the inertial measurement device is used alone and outputs a signal processed by the first signal processing circuit from the first communication unit, and the second processing mode is a mode in which the inertial measurement device is used in a state of being coupled to another inertial measurement device, a first signal processed by the first signal processing circuit and a second signal from another inertial measurement device received from the second communication unit are subjected to a calculation process by the second signal processing circuit, and a signal subjected to the calculation process is output from the first communication unit.

The invention provides a spherical complex vibration type vector hydrophone based on an MEMS accelerometer, and relates to the technical field of underwater acoustic signal detection, and the spherical complex vibration type vector hydrophone comprises an MEMS accelerometer, a built-in core, a piezoelectric ceramic spherical shell, a sound transmission sealing shell, and a suspension ring. The MEMS accelerometer is orthogonally arranged in the built-in core; the built-in core is nested in the lower half ball of the piezoelectric ceramic spherical shell; the upper hemisphere of the perforated piezoelectric ceramic spherical shell is adhered to the upper edge of the built-in core; the sound transmission sealing shell coats the piezoelectric ceramic spherical shell through an encapsulation process; the suspension ring is bonded with the sound transmission sealing shell, and the hydrophone is suspended on the fixing support for use. The composite hydrophone can detect sound pressure signals and vibration velocity signals at the same position underwater, solves the problem of omnidirectional detection of the composite hydrophone on the sound pressure signals, and has the advantages of small size, simple structure, high reliability, wide application range and the like.

The invention discloses a single-axis mechanical accelerometer and a measuring method, and relates to the technical field of accelerometer measuring equipment.The single-axis mechanical accelerometer comprises a base and a dome shell installed on the base, a first cavity is formed in the base, and an I-shaped balancing weight capable of axially sliding is installed in the first cavity; a first spring is mounted between the I-shaped balancing weight and the cavity bottom of the first cavity; a conical sleeve capable of sliding in the radial direction is installed in the dome shell, a transverse shaft is inserted into the conical sleeve in a penetrating mode, the two ends of the transverse shaft are fixedly connected to the inner wall of the dome shell, the transverse shaft is sleeved with a second spring, one end of the second spring is fixedly connected to the transverse shaft, and the other end of the second spring is fixedly connected with the conical sleeve. An alarm triggering module is installed on the dome shell, and through the synergistic effect of an I-shaped balancing weight-spring inertia system and a conical sleeve triggering mechanism, the acceleration detection and alarm functions of a pure mechanical structure are achieved.

A beam laser diode takes a silicon-based nitride epitaxial wafer as a carrier and comprises a silicon substrate layer, an aluminum nitride layer, a u-type gallium nitride layer, an n-type gallium nitride layer, a quantum well layer, a p-type gallium nitride layer and a SiO2 layer which are sequentially arranged from bottom to top, the p-type electrode is arranged on the p-type gallium nitride layer, and the n-type electrode is arranged on the edge of the n-type gallium nitride layer. A nitride material on a silicon substrate is used for preparing a micro-beam stress sensitive area LD by utilizing photoetching and ICP (Inductively Coupled Plasma) etching processes for emitting light, and after electrification, the laser LD is obtained in the stress sensitive area of the beam. Under the power-on condition, before and after acceleration loading, due to the fact that quantum limits the stark effect, the frequency wavelength of laser changes, and the magnitude of the acceleration can be sensed through difference frequency.

The invention discloses a contact type alarm output device for a mechanical accelerometer, and relates to the technical field of accelerometers, the contact type alarm output device comprises a dome shell, and the dome shell is provided with a first cavity; the first contact, the second contact, the first alarm output lead and the second alarm output lead are inserted into the dome shell in a penetrating mode, the first alarm output lead is connected to the end, inserted into the outside of the dome shell, of the first contact, and the second alarm output lead is connected to the end, inserted into the outside of the dome shell, of the second contact. The second alarm output lead is connected to the end, penetrating into the outer portion of the dome shell, of the second contact, one end of the metal spring piece is fixedly connected to the first contact, the other end of the metal spring piece is in point contact with the second contact, and the metal spring piece and the second contact are in point contact design. And in combination with mechanical pushing of the conical sleeve, tight contact and reliable conduction during alarm triggering are ensured, and mistaken contact or poor contact caused by vibration or impact is avoided.

The invention relates to the technical field of equipment state monitoring, in particular to an emergency cut-off valve bolt looseness detection method and system based on multi-modal fusion. The method specifically comprises the following steps of multi-source data synchronous acquisition, accelerometer installation and data processing, environmental adaptability preprocessing, bolt area optical flow feature extraction, Kalman filtering multi-source fusion, bolt looseness detection and loose bolt positioning. According to the emergency cut-off valve bolt looseness detection method based on multi-modal fusion, online, automatic and real-time accurate monitoring and early warning are achieved, the reliability and the anti-jamming capability of the system are remarkably improved, a high-precision and quantifiable objective diagnosis result is provided, good economical efficiency and large-scale deployment feasibility are achieved, and the method is suitable for popularization and application. The industrial pain point that a traditional contact type sensor scheme is difficult to apply to an industrial site with a large number of bolts in a large scale due to too high cost and technical complexity is effectively solved.

The invention discloses a wear state and precision degradation prediction method for a ball screw drive system, and the method comprises the steps: employing a dual-label obtaining strategy, and constructing a'strong label + weak label 'mixed label sequence covering a whole life cycle; mapping a macroscopic working condition into a contact interface micromechanical state quantity, and converting a time domain signal into a travel domain / space domain stable sequence by adopting equal travel synchronous resampling, so as to weaken the influence of speed fluctuation on feature extraction; a double-flow physical guidance neural network is further constructed, and a physical attention mechanism is introduced to realize data feature and physical prior fusion; training is completed based on supervision loss and physical consistency constraint, and online recursive correction is carried out by using sparse laser interferometer calibration data. By adopting the method, the prediction deviation caused by equipment aging and working condition change can be reduced, and stable prediction of the wear state and the repeated positioning error degradation trend is realized.

An adjuster performs simultaneous irradiation of M laser beams to an atomic beam, where M is a predetermined integer satisfying 3≤M. The course of each of the M laser beams intersects with the course of the atomic beam. A component, in a direction perpendicular to the course of the atomic beam, of the sum of radiation pressure vectors that the M laser beams respectively have is zero. A component, in a direction of the course of the atomic beam, of the sum of the radiation pressure vectors that the M laser beams respectively have is negative for atoms having speeds greater than a predetermined speed, and positive for atoms having speeds smaller than the predetermined speed.

The invention discloses a laser speckle testing device based on hyperspectral imaging, which realizes high-precision measurement of laser spots and speckle signals under the condition of not depending on an expensive refrigerating system by optimizing an optical structure and a control strategy. The device comprises an imaging lens, a lens electric control module, a liquid crystal tunable optical filter module, an ND filter wheel, a driving mechanism of the ND filter wheel, a two-dimensional image sensor, a main control unit, a three-axis acceleration sensor, a PC host and a tested screen. A noise calibration piece preset in an ND filter wheel is used for collecting noise data in real time before each time of measurement, and noise deduction is carried out before the filter is switched, so that the timeliness and accuracy of data correction are improved; meanwhile, the integrated three-axis acceleration sensor is used for monitoring vibration, and when vibration exceeding a preset threshold value is detected, it can be judged that currently collected data is invalid, and re-collection is automatically triggered. The device is compact in structure, low in cost and suitable for the fields of laser display, projection calibration, high-brightness light source detection and the like.

According to the quartz vibrating beam accelerometer with enhanced temperature environment adaptability provided by the invention, a TO package of a sensitive structure is not fixedly mounted on an accelerometer shell in a conventional metal connection mode, but is fixed on the inner wall of the shell through an annular colloid, so that the influence of external environment temperature change can be reduced, and the temperature performance of the accelerometer is improved; the thermal baffle plate is arranged between the circuit and the sensitive structure meter head, so that the temperature gradient between the double beams of the sensitive structure caused by circuit starting temperature rise can be effectively reduced, and the starting time of the accelerometer is shortened.

The invention discloses a vehicle collision detection method based on a multi-modal fusion visual terminal, and the method comprises the steps: S1, analyzing a track data packet uploaded by a device end in real time, and obtaining vehicle motion parameters of a predetermined time length and a predetermined dimension; s2, collecting audio and video data of a preset time window of the trigger track data packet, and decoding audio and video information of a set time length; s3, performing data preprocessing on each analyzed modal parameter, constructing a feature set of a single-modal collision detection dimension, and performing feature screening; s4, fusing the sensor gyroscope and the audio and video multi-modal features; and S5, constructing a multi-modal subdivision scene based on the multi-modal features, and constructing a push rule of vehicle collision detection by adopting a decision tree algorithm. According to the invention, modeling is carried out by fusing the three-axis acceleration and audio and video data acquired by the sensor, so that the collaborative and complementary detection of vehicle collision based on multi-modal data is realized.

The invention discloses a biaxial silicon micro-accelerometer based on a three-degree-of-freedom weak coupling resonator, and belongs to the technical field of micro-electro-mechanical systems and microfluid measurement. Comprising a glass base and a silicon micromechanical sensor, the center of the glass base is provided with a protruding common anchor point, the silicon micromechanical sensor is connected to the glass base through the common anchor point, and signal electrodes for transmitting signals are distributed on the glass base; the silicon micromechanical sensor comprises a stress base and resonance modules; the stress base is mounted on the glass base, and the resonance modules arranged in a Y shape are arranged on the stress base; the Y-shaped head of the resonance module is provided with a pair of resonators which are perpendicular to each other and are used for detecting acceleration in the horizontal direction and acceleration in the vertical direction respectively. The stability and the measurement accuracy of the biaxial accelerometer are further improved by arranging a resonator arrangement mode of a stable structure and cooperating with the mechanical stable design of the amplification unit and the safety structure.

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.

A fall protection compliance system includes a connection structure configured for interfacing an anchor structure and a connection sensor associated with the connection structure. The connection sensor includes an accelerometer or a pressure switch, where the connection sensor is configured to monitor continued connection of the connection structure to the anchor structure over a period of time and to output a signal indicating said continued connection.

Various implementations disclosed herein include devices, systems, and methods that localize a device based on detecting planes in depth data acquired by the device. For example, an example process may include detecting first plane data in first sensor data acquired by a sensor at a first viewpoint location in a physical environment, detecting second plane data in second sensor data acquired by the sensor at a second viewpoint location in the physical environment, determining that the first plane data and the second plane data correspond to a same plane based on comparing the first plane data with the second plane data, and determining a spatial transformation between the first viewpoint location and the second viewpoint location based on the first plane data and the second plane data.

An accelerometer includes a housing, a proof mass assembly encased in the housing, and one or more heating elements configured to heat the proof mass assembly in response to an electrical current. The one or more heating elements include a positive temperature coefficient of resistance (PTC) material. The PTC material exhibits a relatively high increase in resistance above a threshold temperature. For example, a ratio of the resistance of the PTC material above the threshold temperature to the resistance of the PTC material at room temperature (PTC ratio) is greater than five.

The invention pertains to a method (100) for predicting failure of one or more components of an individual vehicle, the vehicle comprising a plurality of generic sensors, the method comprising: providing (110) an individual digital twin for the vehicle, the digital twin comprising virtual components that are digital representations of the one or more components of the vehicle; providing (120) digital generic sensors at the digital twin, wherein each digital generic sensor is a digital representation of one of the plurality of generic sensors and generates virtual generic data; providing (125) a digital shock load sensor at each of the virtual components, each digital shock load sensor generating virtual shock load data; performing a simulation involving the digital twin, wherein virtual generic data and virtual shock load data are generated simultaneously; monitoring (130), during the simulation, the virtual generic data and the virtual shock load data; and deriving (140) a relationship between the virtual shock load data and the virtual generic data, wherein the method further comprises: continuously monitoring (150), during a motion of the vehicle, generic sensor data generated by the plurality of generic sensors; inferring (160), based on the monitored generic sensor data and using the derived relationship, actual shock loads affecting each of the one or more components; estimating (170), based on the inferred shock loads, a damage to and / or a time to failure of the one or more components and updating (180) the individual digital twin based on the estimated damage and / or time of failure.