32 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.

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.

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 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 provides a detection method for the oil content of the surface of aluminum and aluminum alloy sheets and foils, comprising the following steps that: reacting a sample to be detected of the aluminum and the aluminum alloy sheets and foils with diluted hydrochloric acid; dissolving oil substances on the sample surface into the hydrochloric acid solution during the reaction process; extracting the oil substances in the hydrochloric acid solution by carbon tetrachloride; quantitative detecting the oil substances by using oil measuring software of an infrared spectrometer; calculating the content of the oil substances in the oil measuring software by the absorbance of spectral bands with wave numbers which are relatively 2930cm<-1> (namely stretching vibration of C-H bond in a CH2 radical), 2960cm<-1>(namely stretching vibration of C-H bond in a CH3 radical) and 3030cm<-1> (namely stretching vibration of C-H bond in an aromatic ring). The principle of the detection method is scientific; the measuring method is simple and easy; the measuring result is accurate.

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 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.

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 invention discloses a method for measuring vibration temperature of flow field in a low-density wind tunnel based on electron beam fluorescence technology. The measurement method first uses the calibration device to obtain the calibration curve of the vibration temperature-characteristic wavelength intensity ratio, and then obtains the spectral intensity ratio of each measuring point through the electron beam fluorescence vibration band image of the measuring point, corresponding to the vibration temperature-characteristic wavelength intensity Compare the calibration curve, calculate the vibration temperature of each measuring point, and draw the vibration temperature distribution map of the low-density wind tunnel flow field. The low-density wind tunnel flow field vibration temperature measurement method based on the electron beam fluorescence technology of the present invention is reliable, effective, convenient to operate, and the calibration of the calibration device is accurate.