33 results about "Vibration spectra" patented technology

Tunable down-hole stimulation systems feature closed-loop control of pumps and tunable down-hole stimulators. Stimulators generate and hydraulically transmit broad vibration spectra tuned for resonance excitation and fracturing of geologic materials adjacent to the wellbore. Feedback data for controlling stimulation includes backscatter vibration originating in stimulated geologic material and detected at the stimulator(s). For initial fracturing with relatively large particle sizes, the power spectral density (PSD) of each stimulator output is down-shifted toward the lower resonant frequencies of large particles. As fracturing proceeds to smaller (proppant-sized) fragments having higher resonant frequencies, backscatter vibration guides progressive up-shifting of stimulator PSD to higher vibration frequencies. Stimulator power requirements are minimized by concentrating vibration energy efficiently in frequency bands to which geologic materials are most sensitive at every stage of stimulation. Geologic fragmentation efficiency is thus optimized, with inherent potential for plain-water fracs completed with self-generated proppant.

A process for monitoring a drive train component (22) of a wind power plant (10) with a rotor (12), the rotor rpm being detected, the wind power plant being controlled such that the rotor rpm rises during an acceleration phase, during the acceleration phase vibration signals being detected by at least one vibration sensor (30) attached to the drive train component in order to detect vibration spectra at different rotor rpm, and the vibration spectra detected at different rotor rpm being displayed as a superposition spectrum in order to evaluate the state of the drive train component.

The present invention discloses a system and method for vibration analysis and phase analysis of vibration waveforms using dynamic statistical averaging of tachometer data to accurately calculate rotational speed. Vibration analysis is performed on a machine having a variable frequency drive by using a tachometer to monitor rotational speed of the drive shaft and a logic device to calculate speed parameters associated with the drive shaft using the tachometer data. The speed parameters include a maximum speed, a minimum speed, and an average speed of the drive shaft. By correlating the vibration spectra of the motor drive with the speed parameters, machine faults can be identified based upon the energy distribution in the spectra. Further, vibration waveforms from two or more locations on the machine can be sequentially acquired through synchronous triggering by using a pulse edge of a stable tachometer signal. The waveforms can be compared to determine a phase difference to help in identifying any machine faults that may be present.

Selected designs for reciprocating pumps and down-hole well-stimulation equipment reflect disparate applications of identical technical principles (relating to, e.g., the vibration spectrum of an impulse). In certain of these designs, the vibration spectrum is controlled, suppressed and / or damped using tunable components to limit destructive excitation of resonances; in others the vibration spectrum is tuned at its source for maximum resonance excitation. For example, tunable fluid ends control valve-generated vibration to increase fluid-end reliability. By down-shifting the frequency domain of each valve-closing impulse shock, initial excitation of fluid end resonances is minimized. Subsequent damping and / or selective attenuation of vibration likely to excite one or more predetermined (and frequently localized) fluid end resonances represents further optimal use of fluid end vibration-control resources. Vibration generation in stimulators, in contrast, includes techniques for production of desired frequency bands (vibration spectra) and amplitudes (vibration energy) near explosively-formed perforations in a wellbore.

Embodiments of a method for determining locations of computers in a group of computers, which may be performed by a system, are described. During operation, the system receives a location of a first computer in the group of computers. Then, the system determines locations of one or more additional computers in the group of computers relative to the first computer based on vibration spectra associated with the first computer and the one or more additional computers.

Vibration of an electric submersible pump assembly is monitored to produce a vibration spectrum. The vibration spectrum is compared to a known vibration signature for a pump condition that precedes gas lock. The pump condition is at least one of an impeller rotating stall condition, a diffuser stall condition, a pre-surge condition, and percentage of free gas within the wellbore fluid. Operation of the pump is then adjusted in response to the similarity of the vibration spectrum to the vibration signature for the pump condition to prevent impending gas lock.

A statistical method is used to separate periodic from non-periodic vibration peaks in machine vibration spectra. Generally, a machine vibration spectrum is not normally distributed because the amplitudes of periodic peaks are significantly large and random relative to the generally Gaussian noise. In a normally distributed signal, the statistical parameter Kurtosis has a value of 3. The method sequentially removes each largest amplitude peak from the peaks in a frequency region of interest in the spectrum until the Kurtosis has a value of three or less. The removed peaks, which are all considered to be periodic, are placed into a candidate peak list. As the process of building the candidate peak list proceeds, if the kurtosis of the remaining peaks in the frequency region of interest falls to three or less, the process stops and the candidate peak list is defined.

Some embodiments of the present invention provide a system that generates a composite vibration profile in a frequency range for a computer system. First, a vibration spectrum in the frequency range is measured for a test computer system in each configuration in a set of configurations. Then, the composite vibration profile for the computer system is generated based on the measured vibration spectra.

The invention is directed to a method for non-invasive determination of the potential presence of one or more loss-of-function mutation(s) in the gene encoding for filaggrin.The method of the invention comprises(i) obtaining a vibrational spectrum from the stratum corneum of the individual;(ii) determining the local natural moisturising factor content from the vibrational spectrum;(iii) optionally repeating steps (i) and (ii); and(iv) comparing the local natural moisturising factor content of the individual to a reference value,wherein said stratum corneum is stratum corneum of a location of the body of said individual at which said one or more loss-of-function mutation(s) in the gene encoding for filaggrin has a stronger influence on the natural moisturising factor concentration than other factors influencing the natural moisturising factor concentration.

The invention discloses a method and a device for acquiring and processing vibration spectrum data of an electric drive system, which aim to solve the problem that the vibration durability of the electric drive system cannot be effectively verified due to the fact that no clear vibration spectrum acquisition method exists in the field of new energy automobiles at present. A tested electric drive system is installed on a test bench, and a plurality of three-phase vibration sensors are installed on the tested electric drive system; the tested electric drive system performs speed-up and speed-down operation, and in the operation process of the motor, a vibration curve of the vibration acceleration of each working condition point relative to the rotating speed of the motor is collected in thewhole process; the vibration curves acquired by all the three-phase vibration sensors are summarized, and the vibration curves of each three-phase vibration sensor mounting point and each vibration direction on the tested electric drive system are analyzed; sinusoidal vibration spectrum data in each vibration direction are obtained through FFT algorithm analysis. The vibration spectrum of the electric drive system under the simulated real vehicle operation condition is effectively reflected, and the reliability of the electric drive system vibration durability experiment is improved.

The invention discloses an integral dropper vibration spectrum acquisition device for a high-speed railway contact network. A non-contact measuring device for acquiring an integral dropper vibration spectrum belongs to the field of rail transit and mainly comprises an acquisition system and a control system, the acquisition system comprises a high-speed camera module (1), a telephoto lens (2) anda triangular support (3), and the control system comprises a PLC control unit (4), an industrial personal computer (5), a data transmission line (6) and a data display (7). According to the acquisition device, vibration images of contact lines (9) and carrier cables (10) at corresponding positions of six integral hanging strings (8) in a span when a train passes by are simultaneously measured neara railway through the high-speed camera module (1), so that the purpose of measuring the vibration spectrum of the integral hanging strings (8) in real time is achieved.

A workflow-based model optimization method for vibrational spectral analysis is provided. The method includes: initializing and determining the evaluation indicator for the model in vibrational spectral analysis and the optimization object of this model, and carrying out permutation and combination on preprocessing methods and multivariate analysis methods to obtain method combinations; determining hyper-parameters within the various method combinations and corresponding hyper-parameter space combinations; inputting the training set into the various method combinations and optimizing hyper-parameters to determine optimal hyper-parameters of the method combinations; using the training set for training to obtain model parameters so as to acquire various combined models; inputting the test set into the various combined models, calculating the evaluation indicator value for the various combined models, and selecting the optimal model. According to the disclosure, a workflow is established, avoiding tedious manual operation and subjective judgment, making full use of parallel computing resources.

While monitoring the condition of a machine, vibration data is often collected for analysis by an experienced analyst. Systems and methods for analyzing vibration spectra associated with machine condition monitoring are disclosed herein. A system may be configured to collect vibration data from one or more vibration sensors, generate a vibration spectrum of the vibration data, and generate a spectral plot of the vibration spectrum. The system may receive a selection of a region of the spectral plot and generate a modifiable window of the vibration spectrum that is embedded within the spectralplot. The system may display a set of graphing tools along with the modifiable window that enable a user to make modifications to the window. The system may detect the modifications and update the modifiable window accordingly.

Some embodiments of the present invention provide a system that generates a composite vibration profile in a frequency range for a computer system. First, a vibration spectrum in the frequency range is measured for a test computer system in each configuration in a set of configurations. Then, the composite vibration profile for the computer system is generated based on the measured vibration spectra.

The invention discloses a planet bearing distributed fault diagnosis and analysis method based on instantaneous angular velocity. The method comprises the following steps: sampling an instantaneous angular velocity (IAS) signal value of a planet carrier; utilizing a linear prediction method to remove deterministic components of gear signals in the signals; further enhancing the fault signal by using a minimum entropy deconvolution (MED) method so as to extract a pulse hidden in the signal; carrying out adaptive modal decomposition on the filtered vibration signal; calculating a peak value anda correlation coefficient of the vibration signal; carrying out amplitude demodulation by using a Hilbert transform technology to form an envelope signal of the planetary bearing; converting the envelope signal into a frequency domain signal; obtaining required planet bearing distributed fault diagnosis information. The invention not only provides an effective method for separating and enhancing the distributed fault signals of the planet bearing, but also provides a fault analysis tool which uses the instantaneous angular velocity signals of the planet carrier as a wide prospect for calculating the fault vibration spectrum of the bearing, and important academic significance and engineering value are realized.

The invention discloses a method for diagnosing the winding state of a transformer under a sudden short circuit based on a vibration signal form spectrum, which includes: (1) performing real-time short circuit monitoring on the transformer, and collecting information on the transformer box wall whenever a sudden short circuit of the transformer is detected. A continuous vibration signal of a section, and calculate the steady-state vibration signal form spectral entropy of the vibration signal collected when a sudden short circuit occurs in the transformer every time by the following steps (2) to step (6); (7) according to the steady-state The morphological spectral entropy of the vibration signal xs(t) is used to judge the winding state: when the change ΔH of the morphological spectral entropy is satisfied, it is determined that the winding of the transformer is loose or deformed when the Y-th sudden short circuit occurs in the transformer. The invention has the advantages of accuracy and high efficiency.

The invention discloses an experimental analysis method of the clearance joint centroid movement trajectory under different gravitational orientation conditions. The method is based on the microgravity environment simulation device of a gravity-oriented rotating table, the device comprises a turntable bracket, a motor, a decelerator, a load bearing platform and a two-link mechanism with a clearance joint fixed on the load bearing platform, and the turntable can achieve 180-degree continuous rotation and self-locking to ensure that a test mechanism rotation joint can be under the different gravity potentials. The measurement of the rotation joint kinematic pair gap in the experimental method is carried out a strain gage gap measurement method based on the strain measurement technology, so that the obtaining of the centroid movement trajectory of a bearing to be tested in the movement process of the two-link mechanism with a clearance joint under the different gravitational orientation conditions can be realized. The gravity-oriented turntable can perform the study on the joint flexibility, arm flexibility and vibration spectrum of a flexible space mechanism under the different gravitational orientation conditions.

The present invention relates to a monitoring device (10) arranged to be operably connected to a medicament delivery device (12), said medicament delivery device (12) comprising a manually operated movable dose activation element (20), said monitoring device (10) comprising an electronic circuit (42), said electronic circuit (42) comprising an optical sensor (68), wherein said optical sensor (68) is positioned in relation to said dose activation element (20) so as to detect a manual operation of said dose activation element (20) from an initial position; said electronics circuit further comprising a vibration sensor (70), wherein said vibration sensor (70) is positioned in relation to said medicament delivery device so as to detect specific vibration spectra produced by the medicament delivery device when said dose activating element (20) is operated, wherein said electronic circuit (42) comprises computing elements capable of correlating the information from the optical sensor (68) with the information from the vibration sensor (70) when said dose activation element (20) is operated in order to register when a correct dose has been set.

Embodiments of a method for determining locations of computers in a group of computers, which may be performed by a system, are described. During operation, the system receives a location of a first computer in the group of computers. Then, the system determines locations of one or more additional computers in the group of computers relative to the first computer based on vibration spectra associated with the first computer and the one or more additional computers.

A vibration analyzer for use in determining a rotational speed. The vibration analyzer includes: a) an input for sensing vibration data, b) a memory for storing the vibrational data, and c) a processor. The processor 1) produces a spectral plot of the vibrational data, 2) locates peaks in the spectral plot, 3) inputs a rotational speed, and 4) scans the spectral plot in predetermined rotational speed increments to provide a candidate rotational speeds. For each candidate rotational speed i) a number of associated harmonics is identified, ii) closest peaks in the spectral plot to the candidate rotational speed and its harmonics are located, iii) gaps between the closest peaks and the candidate rotational speed and its harmonics are measured, iv) summed, and a sum of the gaps is recorded. In step (5) The candidate rotational speed that is associated with a minimum sum is selected as the nominal rotational speed.

The invention discloses a low-density wind tunnel flow field vibration temperature measurement method based on an electron beam fluorescence technology. The measurement method comprises the followingsteps: firstly, obtaining a vibration temperature-characteristic wavelength intensity ratio calibration curve by using a calibration device; obtaining a spectral intensity ratio and a corresponding vibration temperature-characteristic wavelength intensity ratio calibration curve of each measuring point through the electron beam fluorescence vibration band images of the measuring points, calculating the vibration temperature of each measuring point, and drawing a low-density wind tunnel flow field vibration temperature distribution diagram. The low-density wind tunnel flow field vibration temperature measurement method based on the electron beam fluorescence technology is reliable, effective and convenient to operate, and calibration of the calibration device is accurate.

The invention discloses a method for constructing a comprehensive working condition vibration spectrum and a long-life test spectrum of an armored vehicle, and relates to the field of data processing methods. The method for constructing a comprehensive working condition vibration spectrum includes obtaining a single working condition measured spectrum, a first reserve coefficient and The first relationship and the second relationship between the measured spectrum of the comprehensive working condition; the relationship between the first reserve coefficient and the measured spectrum of the comprehensive working condition is obtained according to the first and second relations; the first RBF neural network is trained to obtain the current first reserve coefficient; obtain the first relationship and the second relationship between the standard spectrum of single working condition, the second reserve coefficient and the standard spectrum of comprehensive working conditions; obtain the relationship between the second reserve coefficient and the standard spectrum of comprehensive working condition according to the first and second relationship The relationship between ; train the second RBF neural network to obtain the current second reserve coefficient; obtain the reserve coefficient according to the current first and second reserve coefficients, so as to obtain the measured spectrum and normative spectrum of the actual comprehensive working condition. The invention improves the accuracy and can simulate the real vibration environment more effectively.

The invention provides an IF circuit testing method and device and a random signal generating method and device. The random signal generation method comprises the following steps: controlling a vibration table to vibrate randomly according to a specified vibration spectrum, and collecting voltages at two ends of a sampling resistor; the i * N + 1-th sampling point to the i * N + N-th sampling point are used for calculation to obtain the i-th signal frequency spectrum; comparing the Q signal frequency spectrums to obtain an accelerometer output current individual distribution spectral line under the vibration condition, selecting a plurality of accelerometers of the same type to repeat the operation, and synthesizing individual characteristics to obtain a typical distribution spectral line of the accelerometer of the type; selecting Pj frequency points in a frequency range by using a random function; generating Pj sinusoidal signals, wherein the amplitude of each sinusoidal signal does not exceed the amplitude limit of the frequency point corresponding to the typical distribution spectral line; superposing the Pj sinusoidal signals to obtain a jth sub-random signal of which the duration is Tj; and continuously splicing the J sub-random signals in a time domain to obtain a random digital signal, outputting the random digital signal, and converting the random digital signal into a current signal.

A system and method for determining a physical parameter of a pipe-fluid system includes providing a mechanical vibration spectrum of the pipe-fluid system, which is generated by a mechanical excitation impacting an outer surface of the pipe-fluid system, providing characteristic data of a pipe of the pipe-fluid system, providing process-fluid data of the pipe-fluid system, determining a mechanical model vibration spectrum based on a provided theoretical model for the pipe-fluid system and the provided characteristic data of the pipe and the provided process-fluid data, and comparing the mechanical vibration spectrum and the model vibration spectrum for determining the physical parameter of the pipe-fluid system for determining the physical parameter of the pipe-fluid system.

Systems and methods are provided for vibrations detection in a scene. Systems comprise at least one coherent light source configured to illuminate the scene, an optical unit configured to focus scattered light from the scene onto a pixelated detector, the detector configured to provide pixel intensity signals, and a processing unit configured to analyze the pixel intensity signals over the pixels of the detector to derive a vibration spectrum of elements in the scene that correspond to the pixels. The signal modulation at each pixel may be used to indicate the vibrations of the scene element(s) that corresponds to the pixel(s). Vibration information concerning the scene may be used to direct other methods of vibration measurements, such as speckle interferometry, according to derived vibration images of the scene.

The present invention relates to a monitoring device (10) arranged to be operably connected to a medicament delivery device (12), said medicament delivery device (12) comprising a manually operated movable dose activation element (20), said monitoring device (10) comprising an electronic circuit (42), said electronic circuit (42) comprising an optical sensor (68), wherein said optical sensor (68) is positioned in relation to said dose activation element (20) so as to detect a manual operation of said dose activation element (20) from an initial position; said electronics circuit further comprising a vibration sensor (70), wherein said vibration sensor (70) is positioned in relation to said medicament delivery device so as to detect specific vibration spectra produced by the medicament delivery device when said dose activating element (20) is operated, wherein said electronic circuit (42) comprises computing elements capable of correlating the information from the optical sensor (68) with the information from the vibration sensor (70) when said dose activation element (20) is operated in order to register when a correct dose has been set.

The invention discloses a vibration spectrum analysis-based motorized spindle bearing structure parameter inference method, which sequentially carries out the operations of signal acquisition, filtering pretreatment, FFT (Fast Fourier Transform), fundamental frequency search, scaling factor calculation and modulation coefficient sequence construction, and finally obtains motorized spindle bearing structure parameters including scaling factors, the number of rollers and the inner and outer diameter sizes of a bearing. State evaluation and fault early warning of the bearing can be realized. Vibration spectrum analysis is carried out based on the consistency of the motorized spindle vibration signal frequency spectrum and the theory, reverse inference of the motorized spindle bearing structure parameters is achieved, and the practicability and effectiveness of the method are verified through actual production.

The invention provides a noise source positioning method and system. The noise source positioning method is used for positioning an action part generating abnormal noise in a micro device, and comprises the following steps: acquiring a motion characteristic frequency of a preset action part of the micro device; obtaining a first vibration spectrum of the preset action part when the micro device has abnormal noise and a second vibration spectrum of the preset action part when the micro device has no abnormal noise; determining a noise characteristic frequency of the micro device according to the first vibration spectrum and the second vibration spectrum; and determining the motion component which generates abnormal noise in the micro device according to the motion characteristic frequency of the preset motion component and the noise characteristic frequency. According to the noise source positioning method, the noise source can be positioned more accurately, the positioning precision and the position resolution are improved, and parts generating lightweight noise in the micro device can be effectively positioned.