201results about "Rapid change measurement" patented technology

The invention provides an information acquisition method, device, system and equipment, and the method comprises the steps: carrying out the spectrum analysis of a first pressure signal of a combustion chamber based on a plurality of target frequency bands corresponding to the combustion chamber for any combustion chamber of a gas turbine, and obtaining the signal feature value of the first pressure signal at each target frequency band; according to the signal characteristic value of each target frequency band, identifying a to-be-adjusted frequency band from the plurality of target frequency bands; adjusting a plurality of target frequency bands corresponding to the pressure sensor based on the signal characteristic value of the frequency band to be adjusted, and performing spectral analysis on a second pressure signal of the combustion chamber based on each adjusted target frequency band to obtain a signal characteristic value of the second pressure signal in each adjusted target frequency band; the acquisition time of the second pressure signal is later than that of the first pressure signal. Therefore, the frequency band corresponding to the combustion chamber can be automatically adjusted according to the signal characteristic value of the pressure signal in the combustion chamber in each target frequency band, and the accuracy of obtaining the characteristic information is improved.

The invention discloses an underwater explosion near-field shock wave indirect measurement device in a limited space, a measurement method and an installation method, belongs to the technical field of explosion shock wave load measurement, and solves the technical problem that near-field shock wave measurement and free-field shock wave decoupling measurement cannot be realized due to direct action of strong shock waves and interference of reflected waves in the prior art. The device is of a shock tube type structure and comprises a measuring structure head round tube, a measuring structure tail round tube, a sensor tail bypass extension round tube, a sensor head bypass extension round tube, an underwater explosion free field sensor, a sensor tail bypass round tube and a sensor head bypass round tube. And the tail part of the underwater explosion free field sensor extends into the sensor tail part bypass extension circular tube, and the head part of the underwater explosion free field sensor extends into the sensor head part bypass extension circular tube. The method is suitable for the field of impact measurement of underwater explosion and can be applied to the field of performance evaluation of underwater explosion sources.

MEMS pressure transducer (1) including: a semiconductor body (2); a lower dielectric region (4,6), arranged above the semiconductor body (2); a fixed electrode region (12) and a lower anchoring region (14), which are formed by conductive material, are arranged on the lower dielectric region (4,6) and are laterally separated from each other; a membrane (55) of conductive material, which is suspended above the fixed electrode region (12), so as to delimit a cavity (39) upwardly, the fixed electrode region (12) facing the cavity, the membrane (55) being deformable as a function of pressure and forming a variable capacitor together with the fixed electrode region (12); and an upper anchoring region (37") of conductive material, which laterally delimits the cavity (39) and is interposed, in direct contact, between the membrane (55) and the lower anchoring region (14).

Wearable protection device including at least one inflatable bag configured to assume alternately a rest configuration in a deflated state, and an active configuration in an inflated state, and inflation means in fluid communication with the inflatable bag and configured to introduce therein an inflation fluid once they have been triggered. The wearable protection device further includes at least one pressure detecting device associated with the at least one inflatable bag and configured for directly or indirectly detecting the pressure inside the at least one inflatable bag. A method for evaluating if an inflatable bag of a wearable protection device is reusable once it has been inflated.

The invention relates to the technical field of micro-electro-mechanical system sensors, in particular to an MEMS pressure sensor which comprises a shell, an induction diaphragm and an ASIC signal processing unit, an induction mounting cavity and a signal processing cavity are formed in the shell, an air inlet is formed in the lower end face of the shell, a detection channel and a buffer cavity are formed in the shell, and the detection channel is communicated with the signal processing cavity. The buffer cavity is designed to be gradually expanded from bottom to top; pulse airflow firstly enters the detection channel through the air inlet, and direct disordered impact of the airflow is avoided; then the airflow enters the buffer cavity, the airflow speed and the pressure peak value are gradually reduced and the pulse energy is dispersed by utilizing the characteristic that the cross sectional area of the cavity is gradually increased, and the originally concentrated strong impact force is converted into gentle pressure transmission, so that the abrasion and damage risks caused by the fact that the sensing diaphragm frequently bears the violent pressure are reduced; the structure stability and the sensing sensitivity of the sensing diaphragm can be maintained, and the accuracy of pressure detection and the reliability of long-term work of the MEMS pressure sensor can be guaranteed.

The invention relates to the technical field of dynamic analysis and predictive control of hydraulic machinery, and discloses a method, a device, equipment and a medium for positioning a hydraulic interference source of a pumped storage power station, and the method comprises the steps: constructing a non-uniform density monitoring network of the pumped storage power station; generating a spatial frequency domain matrix of the characteristic frequency band based on the non-uniform density monitoring network, wherein the spatial frequency domain matrix comprises amplitude distribution and phase distribution; based on the phase distribution, a preset inversion algorithm is adopted to solve an interference source space positioning result; and calculating a turbulent energy contribution rate based on the interference source space positioning result and the amplitude distribution, and performing pumped storage power station vortex system energy risk assessment based on the turbulent energy contribution rate. According to the method, the three-dimensional coordinate accurate locking of the hydraulic interference source is realized, the turbulent energy contribution rate is calculated based on the interference source positioning result and the amplitude distribution, the pumped storage power station vortex system energy risk assessment is realized, and the sub-meter positioning and high-risk early warning capabilities are provided for the hydraulic vibration source of the one-pipe multi-machine system of the pumped storage power station.

Aspects of the subject technology relate to electronic devices with pressure sensors for speaker detection. The electronic device includes a housing and a speaker disposed in the housing. The electronic device also includes a pressure sensor disposed within the housing and proximate to the speaker. The pressure sensor is configured to monitor an internal volume within a cavity of the housing. The pressure sensor is also configured to generate, based at least in part on detection of a change in the internal volume within the cavity of the housing, a signal indicating that an output device disposed in the housing is in a valid operational state.

A thrust measuring device for a monopropellant thruster is disclosed to solve the problem of insufficient measurement accuracy in the prior art. The present invention comprises a reference platform and a measuring mechanism, wherein the measuring mechanism is mounted on the reference platform. The measuring mechanism comprises a thruster adapter, a force measuring assembly and a fixed frame, wherein the fixed frame is mounted on the reference platform. The force measuring assembly comprises three working sensors, an inner ring and an outer ring, wherein the three working sensors are evenly distributed and mounted in parallel between the inner ring and the outer ring. A spring pre-tightening structure is provided between the inner ring and the outer ring. The outer ring is fixed to the fixed frame, and the inner ring is connected to one end of the thruster adapter. The other end of the thruster adapter is provided with a mounting structure for mounting the thruster. The present invention achieves high-precision measurement within a thrust range of 0.5-50N by connecting three sensors in parallel and automatically calibrating them in situ, significantly improving the accuracy, efficiency and environmental adaptability of aerospace thruster testing. The present invention relates to the field of thrust measurement technology.

Techniques for detecting service regulator failures comprising receiving time series data from a plurality of sensors in a system. Receiving hydraulic model data associated with the system. Identifying a correlation between first time series data associated with a first sensor of the plurality of sensors and second time series data associated with a second sensor of the plurality of sensors. Determining that the first sensor and the second sensor are disposed downstream of a device for controlling a pressure of a product of the system. Determining a likelihood of a failure of the device is greater than or equal to a threshold. Generating an event and displaying descriptive information identifying the event and one or more response tools for responding to the event.

The application discloses a knock detection method, a knock detection device, computer equipment and a computer storage medium, wherein the knock detection method comprises the following steps: acquiring a pressure signal in an engine combustion chamber; acquiring a resonance frequency of engine knock; decomposing the pressure signal into a high-frequency component signal and a low-frequency component signal according to an empirical mode decomposition method; obtaining a center frequency of the high-frequency component signal according to the high-frequency component signal; in response to the center frequency being located in a range of the resonance frequency, calculating a knock factor according to the low-frequency component signal and the high-frequency component signal; comparing the knock factor with a knock threshold value of the engine, and in response to the knock factor being greater than or equal to the knock threshold value, judging that the engine knocks; and in response to the center frequency being located outside the range of the resonance frequency, or in response to the knock factor being less than the knock threshold value, judging that the engine does not knock. The knock detection method can detect whether the engine knocks.

The invention discloses an asymmetric pulsating pressure measuring device and method suitable for a transonic flight fairing, and belongs to the technical field of information perception and recognition. The pressure sensitive circuit is used for collecting the external pulsating pressure of the fairing in the flight process, eliminating the internal pressure of the fairing through a through hole formed in the body, obtaining the pulsating pressure representing the internal and external pressure difference of the fairing, converting the pulsating pressure into an analog voltage signal and outputting the analog voltage signal to the signal conditioning circuit; the signal conditioning circuit receives the analog voltage signal, amplifies the analog voltage signal, and outputs the analog voltage signal to the filter circuit after zero setting; the filter circuit is used for filtering the signal and then outputting the signal; and the output interface circuit is used for conditioning the input signal to a voltage signal meeting a preset requirement and carrying out amplitude limiting so as to protect a rear-end acquisition circuit. The sensitive assembly based on the dry ceramic thick film capacitance pressure sensing principle is utilized, and the problems that in the prior art, pulsating pressure measurement is limited, and adaptability to industry and mining with static pressure changes is poor are solved.

The present application provides a knock sensor tamper detection method, device, electronic device, and storage medium. The method comprises: defining a vehicle characteristic signal based on a first engine crankshaft angle window; obtaining a current vehicle operating condition; obtaining a current vehicle characteristic signal based on the current vehicle operating condition; determining a signal deviation between the current characteristic signal and a reference characteristic signal; determining whether the signal deviation is below a preset minimum limit; if so, obtaining a duration for which the signal deviation is below the preset minimum limit; and if the duration for which the signal deviation is below the preset minimum limit reaches a preset duration, determining that the knock sensor has been tampered with. This method solves the technical problem that existing technologies can only detect situations where the knock sensor has been completely removed or has no installation torque, but cannot detect tampering such as installing and then tightening a rubber pad, which may result in a failure to protect the engine when knock actually occurs.

The present invention discloses an irrigation channel flow measurement device, which relates to the field of flow measurement technology. The present invention comprises a mounting base, a Parshall flume, and an ultrasonic flowmeter. The Parshall flume is fixedly mounted in the mounting base, and the ultrasonic flowmeter is mounted on the Parshall flume via a mounting rod. The present invention also comprises an interception plate, which is rotatably mounted on the Parshall flume via a rotating rod, and the interception plate is tilted backward from the upstream contraction section of the Parshall flume to the short straight throat section. An impact detection assembly is installed between the rotating rod and the Parshall flume, and the impact detection assembly is used to detect the impact force of the water flow on the interception plate. The advantage is that the present invention can automatically complete the dredging of the interception plate and the Parshall flume according to changes in the water flow rate and the changes in the water impact force on the interception plate, which can effectively improve the accuracy of water flow measurement. At the same time, it can also ensure the water discharge speed when the water flow rate is large, ensuring the stability of the device during flood discharge.

The present invention discloses a plane wave tube and a design method for surface pulsating pressure measurement calibration. The plane wave tube includes a loudspeaker and a sound tube connected to the loudspeaker; the sound tube includes a continuously variable cross-section inner tube in a funnel shape, the large end of the continuously variable cross-section inner tube is connected to the sound-emitting end of the loudspeaker, and the small end is connected to an equal cross-section inner tube; along the axial direction of the inner wall of the equal cross-section inner tube, there are provided no less than two Helmholtz resonators; an equal cross-section branch pipe is installed between the outer tube and the equal cross-section inner tube, one end of the equal cross-section branch pipe leads to the inside of the equal cross-section inner tube, and the other end extends to the outer tube; and a microphone interface for connecting to a microphone is installed at the end of the equal cross-section branch pipe extending to the outer tube. The present invention can calibrate a surface pulsating pressure measurement system, making the measurement of the surface pulsating pressure by the measurement system more stable and accurate, and reducing measurement errors.

To provide a piezoelectric high-pressure sensor that can measure pressures up to 10 kbar. [Solution] The piezoelectric high-pressure sensor of the present invention comprises a hollow cylindrical housing having a shell and a cavity, a disk-shaped diaphragm having a central region and a peripheral region, and a measuring unit having a measuring element made of piezoelectric material disposed within the cavity. The shell includes mounting means, and the piezoelectric high-pressure sensor can be mounted at the measurement location by the mounting means. The diaphragm receives the pressure to be measured by the central region, transmits this pressure along the longitudinal axis into the measuring unit, and is connected to the shell by the peripheral region through a material bond. The measuring element is rod-shaped, functions according to the piezoelectric transverse effect, and has a length along the longitudinal axis and a cross-sectional area perpendicular to the longitudinal axis, with a length-to-cross-sectional area ratio of 1.0 mm. -1 Based on the above, 1.5mm -1 The following conditions apply, and the shell diameter is 10 mm or less.

A pressure sensor (1) has a housing (20), a plunger unit (11) and a measuring element (12); the housing has a housing interior (20.3) in which the plunger unit and the measuring element are arranged; the plunger unit has a distal plunger end (11.1) and a proximal plunger end (11.2), the distal plunger end being arranged farther from the measuring element along a longitudinal axis (A) of the pressure sensor than the proximal plunger end, and the distal plunger end projecting from the housing, and the proximal plunger end is in operative connection with the measuring element and transfers the pressure (P) of a medium (M) present outside the housing to the measuring element; the pressure sensor has a sleeve (30) which is fastened to the housing; the sleeve and the distal plunger end are spaced apart from each other by a gap (30.4); the pressure sensor has at least one sealing element (40) which presses the sealing gap by means of the seal to prevent the medium from going into the housing interior.

A semiconductor package for detecting a pressure of a gas flowing in engine piping, includes a pressure sensor chip configured to convert a pressure of a first pressure medium, which is the pressure of the gas, into an electrical signal, a pressure detection chamber housing the pressure sensor chip such that the pressure sensor chip detects the pressure of the first pressure medium sent thereto, and a pressure intake part disposed between the engine piping and the pressure detection chamber. The pressure intake part has a switch configured to switch between an open state and a closed state by physically receiving an external force. The switch spatially couples the engine piping and the pressure detection chamber via the pressure intake part in the open state, and spatially isolates the engine piping and the pressure detection chamber from each other in the closed state.

The utility model provides a diesel engine explosion pressure and compression pressure testing device, which belongs to the technical field of diesel engines and comprises a heat conduction seat and a pressure sensor. An air inlet channel, an expansion channel communicated with the air inlet channel and a communication channel communicated with the expansion channel are arranged in the heat conduction seat; the aperture of the expansion channel is larger than the aperture of the air inlet channel and the aperture of the communication channel so as to increase the contact area of gas exhausted by the air cylinder and the heat conduction base. The pressure sensor is connected with the heat conducting seat, and the communication channel is communicated with the pressure sensor; the air inlet channel communicates with the air cylinder. According to the utility model, more heat in the gas exhausted by the cylinder of the diesel engine can be dissipated through the heat conducting seat and the expansion channel, and the exhaust temperature is reduced, so that the distortion of the pressure sensor is avoided, and the accuracy of the pressure value detected by the pressure sensor is improved.

The invention relates to a vehicle surface pressure pulsation measuring system which comprises a flow-sound pressure pulsation measuring device, a data acquisition module and an upper computer which are connected in sequence. Wherein the flow-sound pressure pulsation measurement device has an aerodynamic shape and variable curvature, and comprises a substrate, a turbulent flow pressure pulsation measurement area and a sound pressure pulsation measurement area, and the turbulent flow pressure pulsation measurement area and the sound pressure pulsation measurement area both comprise a plurality of micro-electro-mechanical microphones designed and arranged according to the optimal spacing range; the micro-electro-mechanical microphones in the turbulent flow pressure pulsation measurement area are arranged in a triangular shape, and the direction pointed by the vertex angle of the triangle faces the wind; the micro-electro-mechanical microphones in the sound pressure pulsation measurement area are arranged in an array, and acoustic covering films are attached to the measurement surfaces of all the micro-electro-mechanical microphones; the data acquisition module acquires data of all micro electro mechanical microphones in the flow-sound pressure pulsation measuring device in real time and transmits the data to the upper computer for storage, analysis and recording. Compared with the prior art, the method has high accuracy and integration level.

The invention relates to a method for operating an internal combustion engine (1) with an exhaust gas line (2) which directs an exhaust gas (3) from the internal combustion engine (1) via an exhaust gas turbocharger (4), wherein a second pressure (7) in a second section (8) of the exhaust gas line (2) downstream of the exhaust gas turbocharger (4) is determined by measuring a first pressure (5) in a first section (6) of the exhaust gas line (2) downstream of the internal combustion engine (1) and upstream of the exhaust gas turbocharger (4); wherein this determination of the second pressure (7) is derived from the condition that at certain operating points (9) of the internal combustion engine (1) at certain crankshaft angle positions (10) the first pressure (5) corresponds to the second pressure (7).

The invention provides a sealing structure and an air inlet pressure sensor, and belongs to the technical field of sensors, and the sealing structure comprises a sealing cover, a plurality of first connecting pieces and a plurality of second connecting pieces. The sealing cover is buckled on the frame body and used for sealing the first space. The first connecting pieces are distributed along the edge of the sealing cover at intervals. And each first connecting piece has a bendable elastic degree of freedom. And each first connecting piece is provided with a clamping end which can be clamped with the frame body and extends into the second space from the first space after the sealing cover is buckled on the frame body. And the plurality of second connecting pieces are distributed at intervals along the edge of the shell cover plate and are in one-to-one correspondence with the first connecting pieces. And each second connecting piece has a bendable elastic degree of freedom. And when the shell cover plate is buckled on the shell, each second connecting piece extends into the second space and is clamped with the clamping end of the corresponding first connecting piece so as to limit the clamping end to retract into the first space. According to the sealing structure provided by the invention, double-sealing protection on the circuit board in the frame body is realized through the sealing cover and the shell cover plate.

A device for cavitation detection of a pure water hydraulic system based on pressure includes a chamber component; an inner diameter of the drainage nozzle gradually increases along an inflow direction of a liquid medium, so as to reduce a flow velocity of the liquid medium after being drained into the drainage nozzle; and the detection assembly includes a housing, one end of the housing facing the drainage nozzle is an open end, an elastic cover sheet is arranged in the open end, an electrode is arranged in the housing, diaphragms are respectively arranged on two sides of the electrode, and the electrode is closely attached to the elastic cover sheet through one of the diaphragms; the liquid medium is ejected from the drainage nozzle and impacts the elastic cover sheet.

The invention relates to a device for measuring combustion processes in an internal combustion engine. The device comprises a sensor, which is attached to a surface of the internal combustion engine, the sensor being designed to measure deformations of the surface of the internal combustion engine which are caused by combustion processes in the internal combustion engine.

The utility model discloses an automobile pressure sensor, which belongs to the technical field of air inlet pressure sensors, and comprises a shell, a signal interface, an air inlet pipe and a clamping assembly, one side of the shell is fixedly connected with the signal interface, and a certain angle is arranged between the signal interface and the shell. The air inlet pipe is arranged at the bottom end of the shell and communicates with the interior of the shell, the clamping assembly is arranged at the bottom end of the shell, the air inlet pipe is located in the clamping assembly, and the clamping assembly is used for connecting a hose and the air inlet pipe in a clamped mode, so that tighter connection can be provided; the possibility of gas leakage is reduced, the hose is prevented from loosening or falling off in the operation process, the stability and reliability of the system are improved, good contact between the gas inlet pressure sensor and the gas inlet pipe is kept through stable connection, and therefore the accuracy and reliability of measurement are improved.

Internal combustion engine device, comprising: an internal combustion engine (22); a differential pressure sensor (138) configured to include a differential pressure line (138a) mounted to an exhaust line (133) of the internal combustion engine (22); and a controller (24) configured to control the internal combustion engine (22), wherein the controller (24) estimates that the differential pressure line (138a) has a blockage when a pulsation width of a detected differential pressure detected by the differential pressure sensor (138) is smaller than a predetermined width, characterized in that, when the differential pressure line (138a) is estimated to have a blockage, the controller (24) estimates a response delay time of the detected differential pressure so that it increases with a decrease in the pulsation width of the detected differential pressure.

The invention relates to a liquid rocket engine turbine disc pitch diameter vibration monitoring method, and belongs to the technical field of liquid rocket engine testing. According to the invention, high-frequency speed pressure sensors are additionally arranged at front and rear cavity parts at two sides of the turbine disc, and high-frequency pressure pulsation of fluid near the turbine disc is measured in real time, so that the pitch diameter vibration inherent frequency and the vibration magnitude of front and rear traveling wave frequencies of the monitored turbine disc in the high-temperature and high-rotating-speed operation process are obtained; therefore, a basis is provided for health judgment of the working state of the turbine pump after test run. The method can accurately reflect the pitch diameter vibration level of the thermal test rocket engine turbine disc, has high sensitivity, and solves the problem that the local vibration frequency of the rotor turbine disc is not easy to monitor during the vibration of a traditional turbine pump shell.

The application relates to the technical field of micro-electro-mechanical system sensors, in particular to a MEMS pressure sensor which comprises a shell, a sensing diaphragm and an ASIC signal processing unit, the shell is internally provided with a sensing installation cavity and a signal processing cavity, an air inlet is formed in the lower end face of the shell, a detection channel and a buffer cavity are formed in the shell, and the buffer cavity is designed in a gradually expanding mode from bottom to top; pulse airflow first enters the detection channel through the air inlet to avoid direct and disordered airflow impact; then the airflow enters the buffer cavity, the gradually increasing cross-sectional area of the cavity body is utilized to gradually reduce airflow speed and pressure peak value, disperse pulse energy, convert the originally concentrated strong impact force into gentle pressure transmission, thereby reducing the abrasion and damage risk of the sensing diaphragm caused by frequently bearing intense pressure, helping to maintain the structural stability and sensing sensitivity of the sensing diaphragm, and guaranteeing the accuracy of the MEMS pressure sensor in pressure detection and the reliability of long-term work.

A device for cavitation monitoring of a hydraulic system includes a branch pipe connected to a hydraulic pipe; a movable unit arranged in the branch pipe and in sliding fit with the branch pipe; and an acquisition unit arranged in the branch pipe and configured to acquire position information of the movable unit. The movable unit is configured such that when a gas filling amount in a medium in the hydraulic pipe changes, the movable unit moves along the branch pipe. The device also includes an information display unit connected to the acquisition unit and configured to analyze and display the position information acquired by the acquisition unit. The device also includes a buffer unit connected to one side of the movable unit close to the hydraulic pipe.

The present invention comprises: a first comparison circuit that compares a threshold voltage and a first voltage signal generated from a first charge signal, which is output to a first signal line by a vibration sensor mounted to an internal combustion engine and indicates the magnitude of vibrations detected by the vibration sensor, and that outputs an output signal of a constant value if the first voltage signal exceeds the threshold voltage; a second comparison circuit that compares a threshold voltage with a second voltage signal generated from a second charge signal, which is output by the vibration sensor to a second signal line and is an inverted signal of the first charge signal, and that outputs an output signal of a constant value if the second voltage signal exceeds the threshold voltage; and a signal processing unit that detects a disconnection status between the first signal line and the second signal line on the basis of the output signals respectively output by the first comparison circuit and the second comparison circuit.

The present invention pertains to a noise source identification and mitigation method for a knock detection method of a gas engine, comprising the steps of retrieving (S40F) a false-positive knocking signal, determining (S45) if the false-positive knocking signal (18F) stems from a predetermined noise signal or an unidentified noise signal, and triggering (S47) an action suitable for avoiding detections of noise signals similar to the false-positive knocking signal (18F).