127 results about "Vibration threshold" patented technology

A method for operating a gas turbine engine includes coupling at least one sensor within the gas turbine engine to transmit a signal indicative of a vibration level of a rotor assembly within the gas turbine engine, detecting the vibration level of the rotor assembly based on the signal transmitted from the at least one sensor, comparing the detected vibration level to a predetermined vibration threshold, and generating an output if the detected vibration amplitude exceeds the threshold amplitude for a predetermined duration to facilitate identifying a gas turbine engine impulse event.

The invention discloses a method for judging complete vehicle hot idle wobbling. The method includes steps of (1) measurement point arrangement including placing a vehicle body horizontally and arranging vibration sensors on seat guide rails, suspensions, suspension supports and an engine; (2) testing including starting the engine, enabling the indicator of a water temperature meter to reach a middle line during the testing process, maintaining an idle rotation speed and making sure the hot idle testing time at least longer than 2 min; (3) evaluation analysis including judging the complete vehicle hot idle wobbling to be qualified when the first-order vibration at the seat guide rails is smaller than first phase preset vibration threshold value and second-order vibration is smaller than asecond-order preset vibration threshold value, otherwise, judging the complete vehicle hot idle wobbling to be unqualified. According to the invention, from the engine which is the source, vibration data of different transmission path is collected and abnormal wobbling is analyzed by utilizing frequency spectrum data. At the same time, a corresponding standard is proposed for quantifying the hot idle wobbling level sensed by a human body, so that inaccuracy of simple subjective evaluation for describing the wobbling size is avoided.

The invention provides a remote environment monitoring device. A humidity sensor, a temperature sensor, a PM2.5 sensor and a carbon monoxide sensor are used for monitoring urban environment quality. Furthermore a vibrator sensor is arranged in the remote environment monitoring device. When a measured vibration value is higher than a preset vibration threshold, a central processor makes a signal trigger transmit an image acquisition triggering signal to an image acquisition device. The image acquisition device starts to acquire image information around the remote environment monitoring device,and image processing is performed on the image which is acquired by the image acquisition device and is around the remote environment monitoring device. The processed image is transmitted to the central processor. The central processor determines whether the remote environment monitoring device operates on the condition of artificial interference according to the received image information which is output from the image processing device. If yes, an alarm transmits alarm information.

The invention discloses a snore detecting method and system. The snore detecting method and system overcome the defect that in the prior art, the accuracy of detection of snores generated when people sleep is low. The snore detecting method comprises the steps that breathing signals are detected continuously at the position of an air outlet of a breathing machine; a breathing vibration threshold value is obtained according to the vibration amplitude values of the continuously-detected breathing signals; when the vibration amplitude value of the breathing signal detected mostrecently is larger than the breathing vibration threshold value, it is confirmed that snores are generated during breathing corresponding to the breathing signal detected most recently. According to the snore detecting method and system, equipment obtaining difficulty is lowered, development cost is reduced, and snore detection accuracy is improved.

An injected dose detection device which includes a housing having a joint surface surrounding an injection device and a through hole formed on the joint surface configured to communicate with an internal part of the housing, a vibration sensor disposed in the internal part of the housing configured to detect at least one vibration signal based on a minimum vibration threshold, a vibration transmitting element positioned directly between the vibration sensor and the injection device and configured to transmit the at least one vibration signal and a processing unit configured to process the at least one vibration signal for generating injected dose information corresponding to the injected dose.

The invention relates to the technical field of air conditioners, and specifically relates to an air conditioner low-frequency resonance noise recognition control method and an air conditioner. The method comprises the following steps: a noise sensor and a vibration sensor are used to collect data of the air conditioner; low-frequency resonance noise is identified and judged by giving noise and vibration thresholds; compressor frequency is adjusted for an abnormal noise frequency point to optimize the resonance noise; if resonance noise cannot be solved after the frequency of the compressor isadjusted for many times, an alarm system carries out data extraction and analysis on the abnormal noise frequency point, and the analysis data is fed back to a control terminal for processing at twoalarm levels of high-level alarm and low-level alarm; and therefore, an engineer can be helped to quickly find out the causes of problems and give accurate rectification schemes, the low-frequency resonance noise is optimized, the sound quality of the air conditioner is improved, the discomfort of a human body caused by the low-frequency noise is avoided, and the use experience of a user is improved.

A method for identifying a wind or water turbine, or component thereof, for maintenance, comprises the steps of: determining an operating parameter value for the wind or water turbine; analyzing vibration data for the wind or water turbine; and comparing the vibration data with a threshold related to the operating parameter value. This approach means that vibration thresholds vary according to the expired life of wind or water turbine, leading to a more accurate identification of wind or water turbines which may be in need of maintenance, and which should be investigated.

The invention discloses a self-learning fault monitoring and alarming system of a three-legged centrifuge. An acceleration sensor is installed on a centrifuge motor or a base close to the motor, a temperature sensor is installed on the side surface in a centrifuge body, and a data acquisition card collects data of the acceleration sensor and the temperature sensor and sends the data to an industrial control computer. The industrial control computer operates the fault monitoring and alarming system to monitor a centrifuge in real time. The system has the advantages that the vibration-temperature determination threshold is automatically set through vibration-temperature signal collection when the centrifuge is put into use; the vibration data is collected after the centrifuge works for a period of time, and the vibration threshold of the centrifuge is predicted for the next time period through self-learning, so as to avoid the false determination caused by the rigorous initial thresholdsetting.

The invention provides an environmental monitoring method preventing man-made interference. The method comprises the following steps: monitoring urban environmental quality by using a humidity sensor,a temperature sensor, a sulfur dioxide sensor and a nitrogen dioxide sensor, at the same time, setting a vibration sensor in an environmental monitoring system preventing man-made interference, whenthe measured vibration value is greater than a preset vibration threshold, controlling, by a central processor, a signal trigger to send an image collection trigger signal to an image collection device, starting collecting, by the image collection device, image information around the environmental monitoring system preventing man-made interference, performing image processing on the image around the environmental monitoring system preventing man-made interference collected by the image collection device, transmitting the processed image to the central processor, and judging, by the central processor, whether the environmental monitoring system preventing man-made interference runs in the presence of man-made interference according to the received image information output by the image processing device, if so, sending, by an alarm device, alarm information.

The invention provides a numerical control machine cutter head fault diagnosis system. A central processing device, a vibration sensor, a signal processing circuit, an A/D conversion module, an imagecollection module, an image processing module, a power supply module, a comparison module, a warning device, a wireless transmission device, a user control end, a display device and a storage device are used, so that the effective monitoring on a cutter head of a numerical control machine can be realized; the vibration parameters of the cutter head in the processing process can be tested through the vibration sensor; the vibration parameters can be combined with the preset vibration threshold; the image information of the cutter head can be collected through the image collection device; workers can effectively monitor the cutter head of the numerical control machine by combining the cutter head image information and the cutter head vibration signals collected by the vibration sensor; the image processing module sequentially performs image enhancing, image smoothening, image sharpening and image grayscale conversion processing on the collected images.

The invention provides an urban environment quality monitoring system, and the system carries out the monitoring of the urban environment quality through a humidity sensor, a temperature sensor, a PM2.5 sensor and a carbon monoxide sensor. Meanwhile, the system is provided with a vibration sensor. When a measured vibration value is greater than a preset vibration threshold value, a central processor controls a signal trigger to transmit an image collection triggering signal to an image collection device, and the image collection device starts to collect the image information around the system,and the image, collected by the image collection device, around the system is processed, and the processed image is transmitted to the central processor. The central processor judges whether the system operates under the manual interference or not through the received image information outputted by the image processing device: enabling the alarm device to give an alarm if the system operates under the manual interference.

The invention provides a determination method for a safe excitation parameter of an explosive epicenter. The method comprises that (a) a near land surface investigation method is used to delimit a rock layered position of a surface layer preliminarily; (b) aimed at a main protection object, a safe small dose is selected for trial shot, and a maximal vibration speed value is extracted; (c) a vibration attenuation parameter inversion matrix of the stratum is established according to the rock position of the surface layer, positional relation between a trial shot point and a vibration monitoring point and the monitored and extracted maximal vibration speed; (d) the vibration attenuation parameter inversion matrix in the step (c) is solved to obtain vibration attenuation relations among the surface layers; and (e) according to a safe vibration threshold and the vibration attenuation relations of the surface layers, the better safe excitation parameter is determined. The determination method for the safe excitation parameter of the explosive epicenter is high in speed, wide in application range, low in cost, easy to realize and effective.

The invention relates to an automatic deep-groove-ball-bearing wear life testing machine. The automatic deep-groove-ball-bearing wear life testing machine comprises a frame, an axial pneumatic loadingdevice, a drive system, a motor seat, locking bolts, support feet, a motor, an oil lubricating system, a heating device, an industrial personal computer, a charge amplifier, a sensor, a loudspeaker and a data collecting and control system. The automatic deep-groove-ball-bearing wear life testing machine has the advantages that the machine is adjustable in rotation speed and load and especially applicable to the vibration measuring and wear life testing of miniature and small deep groove ball bearings; many bearing vibration parameters (such as low-frequency, medium-frequency, high-frequency and direct-frequency effective values, peak values, peak value factors and pulse number) can be measured, a vibration threshold can be set, and after the fact that a bearing reaches the wear life is determined when the measured vibration value exceeds the set vibration threshold, the wear life testing machine automatically shuts down to guarantee safety.

The invention discloses an inspection robot system's vibration measurement control method, comprising the following steps: step 1) a robot runs to a vibration testing point; step 2) the robot obtains the vibration testing point related information; step 3) the robot configures its internal components according to related information and if the configuration is normally done, the robot goes on to the step 4; otherwise, an alarm is prompted and step 7 is executed; step 4) the robot controls a vibration measurement laser head to focus and gather the times of failures; and if the focusing is successful within the preset failure threshold, then, the robot goes on the step 5; and if the preset failure threshold is exceeded, the an alarm is prompted and step 7 is executed; step 5) the robot acquires the image of a tested device, calculates the vibration value and compares the vibration value with a preset vibration threshold; if the vibration value is within the vibration threshold, no alarm is prompted; and if the vibration value goes beyond the vibration threshold, an alarm is prompted; step 6) the robot uploads the vibration value and the comparison result; and step 7) the robot runs to the next testing point. The method of the invention is simple to implement and the automation of the method is high.

The invention discloses a transformer online monitoring device and a transformer online monitoring method based on instantaneous acceleration characteristics. The device comprises an instantaneous acceleration characteristics measurement module, a signal conditioning and acquisition module and a digital processing and analyzing module; the instantaneous acceleration characteristics measurement module is connected with the signal conditioning and acquisition module, and the signal conditioning and acquisition module is connected with the digital processing and analyzing module. With the methodand the device provided by the invention, instantaneous acceleration characteristics information of a plurality of measurement points of a transformer oil tank main body is obtained in real time, an action acceleration value representing vibration amplitude of the transformer main body is calculated, and by comparison with an over vibration threshold value and a quasi over vibration threshold value, whether the measured transformer has main body abnormal over vibration is judged. The device provided by the invention is independent from a power network, and has the advantages of being simple and easy to realize, reliable and accurate, and so on. Application of the method and the device provided by the invention is helpful for transformer operating workers to accurately and reliably acquireinstantaneous acceleration data of the transformer main body in real time.

The invention provides an online environment detection method. A humidity sensor, a temperature sensor, a sulphur dioxide sensor and a nitrogen dioxide sensor are used to monitor the urban environmentquality, the system is provided with a vibration sensor at the same time, when a measured vibration value is greater than a preset vibration threshold, a central processor controls a signal trigger to emit an image collection triggering signal to an image collector, the image collector starts collecting image information in the surrounding of the system, images collected by the image collector are processed and then sent to the central processor, the central processor determines whether the system runs under manual interference according to the received image information, and if YES, an alarmdevice emits alarm information.

A vehicle passenger detection apparatus includes a load detecting part and a seat condition determining part. The seat condition determining part includes a vibration threshold value setting section, a vibration determining section and a seat determining section. The vibration threshold value setting section sets a vibration threshold value based on the load detection signal such that the vibration threshold value is higher when a fluctuation amount of the load detection signal is small than when the fluctuation amount of the load detection signal is large. The seat determining section executes a seating determination based on the load detection signal when the vibration determining section determines that the vehicle vibration is not occurring based on the load detection signal and the vibration threshold value, and to defer execution of the seating determination to maintain a previous seating determination result when the vibration determining section determines that the vehicle vibration is occurring.

The invention provides a numerically-controlled machine tool bit fault diagnosis system. The numerically-controlled machine tool bit fault diagnosis system comprises a central processing apparatus, avibration sensor, a signal processing circuit, an A/D conversion module, an image acquisition module, an image processing module, a solar uninterruptible power supply module, a comparison module, an alarming apparatus, a wireless transmission apparatus, a user control end, a display apparatus and a storage apparatus. By adopting the numerically-controlled machine tool bit fault diagnosis system, the tool bit of a numerically-controlled machine tool can be effectively monitored, not only can the vibration parameter of the tool bit in the machining process be tested by virtue of a vibration sensor, and the vibration parameters be compared with a preset vibration threshold value, but also the image information of the tool bit can be acquired by virtue of an image acquisition apparatus, the working personnel can effectively monitor the tool bit of the numerically-controlled machine tool according to the tool bit vibration signal and the tool bit image information acquired by the vibrationsensor, and the image processing module successively performs the image enhancing, image smoothening, image sharpening, and image grey level transformation processing for the acquired image.

The embodiment of the invention provides a prediction and diagnosis method and system for a gear fault of a drive axle main speed reducer. The method comprises the steps that a vibration accelerationsignal of the drive axle main speed reducer is collected; according to the vibration acceleration signal, a vibration value of a gear engagement order of the drive axle main speed reducer is determined; and the vibration value is compared with a preset vibration threshold value, a prediction diagnosis result is determined, and the prediction diagnosis result is used for indicating whether the drive axle main speed reducer gear needs to be repaired and maintained or not. According to the method provided by the embodiment of the invention, the problems that in the prior art, only offline detection can be carried out, the gear of the drive axle main speed reducer cannot be predicted and diagnosed, and then the safety problem of a vehicle in the running process cannot be ensured can be solved.

Methods and systems are provided for measuring vibrations in an imaging system. In one embodiment, a method for a computed tomography (CT) system includes measuring a vibration level of a rotatable gantry of the CT system with a balance sensor coupled to a stationary housing of the CT system and outputting a notification indicating potential image artifacts based on the vibration level exceeding a vibration threshold.

The invention is applicable to the technical field of mobile communication and provides a method for preventing a mobile terminal from misoperation and a mobile intelligent terminal. The method includes that when the mobile terminal is in a bright screen and to-be-unlocked state and can receive touch signals, whether an object contacts a camera of the mobile terminal or not is judged, whether a vibration value of the mobile terminal reaches a vibration threshold value or not is judged if the object contacts the camera of the mobile terminal, and the mobile terminal stops processing the touch signals if the vibration value of the mobile terminal reaches the vibration threshold value. According to the method, the operation environment of a mobile phone in a bright screen and to-be-unlocked state is judged, the touch signals can be subjected to stopping processing according to conditions of possible misoperation, and the problem of misoperation caused by outside touching in prior art is solved.

Embodiments of the invention disclose an inverter compressor frequency adjusting method and device, equipment and a storage medium. According to the embodiments of the invention, the vibration amplitude of a unit is detected in the frequency increasing or decreasing adjustment process of a compressor, and the frequency is adjusted when the vibration amplitude of the unit exceeds a preset vibrationthreshold value, so that the vibration amplitude of the unit is lower than the vibration threshold value; and meanwhile, the vibration amplitudes of the unit under different operation frequencies anddifferent operation working conditions of the compressor are recorded, and an operation record chart is generated in order to determine the optimal operating frequency of next operation of the unit.By the adoption of the technical means, the problem that an existing compressor unit is too large in vibration amplitude can be solved, the operating frequency of the compressor is adjusted accordingto the actual working condition of the compressor, then the vibration amplitude of the unit is adjusted in real time, a good unit vibration amplitude adjusting effect is achieved, and the compressor unit is prevented from being damaged due to excessive vibration.

The invention discloses a photographic processing method and system. The method comprises the following steps: buffering a current image captured by an image acquisition unit of electronic equipment; obtaining another frame of image which is captured by the image acquisition unit and buffered before the current time; obtaining parameter data of the current image and another frame of image; comparing the parameter data of the current image and another frame of image to obtain a variation in the parameter data; when the variation in the parameter data reaches a preset vibration threshold, photographing the current image. According to the method, the variation in the parameter data between the current image and another frame of image is compared with the preset variation threshold; when the variation in the parameter data reaches the preset vibration threshold, photographic operation is performed, that is, an object in a lens is considered moving as long as parameter data of an image acquired by the image acquisition unit varies during a photographic process, and then photographic operation is performed; therefore, a user can obtain a required photo without always noticing a scene in the lens, and convenience is brought for operation of the user.

The invention provides an environment monitoring method for preventing man-made interference, and the method comprises the steps: employing a humidity sensor, a temperature sensor, a PM2.5 sensor anda carbon monoxide sensor for monitoring the urban environment quality; setting a vibration sensor in an environment monitoring system for preventing man-made interference at the same time; enabling acentral processor to control a signal trigger to emit an image collection triggering signal to an image collection device when a measured vibration value is greater than a preset vibration threshold value; enabling the image collection device to star to collect the image information of the surroundings of the environment monitoring system, and carrying out the processing of the image, collected bythe image collection device, of the surroundings of the environment monitoring system; transmitting the processed image to the central processor, and enabling the central processor to judge whether the environment monitoring system operates under the man-made interference or not through the received image information outputted by the image processing device: enabling an alarm device to transmit alarm information if the environment monitoring system operates under the man-made interference.

The invention provides an environment online detection method, and the method comprises the steps: carrying out the monitoring of urban environment quality through a humidity sensor, a temperature sensor, a PM2.5 sensor and a carbon monoxide sensor, wherein an environment online detection system is provided with a vibration sensor; enabling a central processor to control a signal trigger to transmit an image collection triggering signal to an image collection device when a measured vibration value is greater than a preset vibration threshold value; enabling the image collection device to startto collect the image information of the surroundings of the environment online detection system, and carrying out the processing of the image, collected by the image collection device, of the surroundings of the environment online detection system, and transmitting the processed image to the central processor; enabling the central processor to judge whether the environment online detection systemoperates under the manual interference or not according to the received image information outputted by the image processing device: enabling an alarm device to transmit alarm information if the environment online detection system operates under the manual interference.