73 results about "Wave motion" patented technology

An acoustic wave identification transponder device, having a substrate, an electroacoustic transducer generating an acoustic wave in said substrate and a set of encoding elements disposed in a path of the acoustic wave for modifying the acoustic wave, having elements which reflect portions of the acoustic wave having a component orthogonal to the incident wave. The reflectors may be, for example, trackchangers or reflective arrays compressors (RAC). The wave may be phase-amplitude modulated for increased efficiency expressed in bits per tap. Such phase amplitude modulation is preferably imposed by partial beam width phase delay elements disposed within an acoustic beam path.

The invention discloses a lifting method and a lifting system for six-degree-of-freedom active type wave compensation. The lifting method is characterized in that eight sets of servo systems and a binocular vision detection system are arranged on lifting equipment of a supply ship, each servo system consists of a steel wire rope traction lifting tool system driven by a servo motor, and the binocular vision detection system comprises two cameras; every two of eight steel wire ropes in the lifting tool system are respectively tied to the four corners of a load, and the two cameras are used for respectively detecting, and forming negative feedback according to the relative positions and relative attitudes of the supply ship and the supplied ship in the supply process, and the current speed and position parameters of the steel wire ropes, and the negative feedback is input into the control parameters of the steel wire ropes; the servo motors are used for controlling the rotation speeds and directions of the steel wire ropes according to the control parameters, the six-degree-of-freedom movement of the load corresponding to a base is uniform with the six-degree-of-freedom movement of the supplied ship corresponding to the base, and the purpose of six-degree-of-freedom relative movement compensation is realized. The lifting method has the advantage that the anti-swinging characteristic is better.

The invention relates to a method for generating the P-wave time-domain high-precision converted wave profile in the geophysical prospecting, comprising the following steps: picking up the location of a selected index bed on the P-wave seismic profile and the converted wave seismic profile; calculating the compression ratio of the converted wave in relation to the P-wave; re-sampling and compressing, and transforming the converted wave time domain into the P-wave time domain; extracting the seismic attributes of the instantaneous amplitude, the instantaneous phase and the instantaneous frequency; calculating the cross-correlation coefficients of the compressed converted wave seismic attributes to evaluate the arithmetic mean value of the cross-correlation coefficients; determining the points with the cross-correlation coefficients greater than the threshold value as the changeable control points; evaluating the compression ratio of the converted wave between two adjacent control points, relative to the P-wave; and converting the seismic trace to obtain the high-precision conversion wave profile of the P-wave time domain. The invention makes use of the reflection intensity, instantaneous phase, instantaneous frequency and other attributes, and takes into account the advantages of the standard horizon method and the cross-correlation method so as to achieve highly precise and strongly reliable results.

The invention discloses the method for measuring the beat frequency of the non-mechanical optical gyro by using the ring travelling wave resonant cavity. Further, the angular speed of inertial systemis measured. The ring travelling wave resonant cavity is positioned on the inertial system, which is rotated at certain angular speed. The otpical signal feeds-in-the ring travelling wave resonant cavity by usnig 2X2 wave-guide coupler, thus light wave field propagates to both of the clockwise direction and anti-clockwise direction. The beat frequency signal can be obtained by superposing the tworesonant optical signals with different frequencies, which can be obtained by using the wave guide coupler to couple directly from the travelling wave resonant cavity. The low-pass filter takes out the beat frequency signal, whose frequency value and variety is corresponding to the angular speed and variety of inertial system.

The invention discloses a navigation X-wave-band radar wave group detection method based on a wave theory. The navigation X-wave-band radar wave group detection method based on a wave theory includes the steps: performing empirical orthogonal function decomposition on a navigation X-wave-band radar image sequence, selecting a main modal to reconstruct a wave field, and obtaining the wave surface displacement of different positions in an observed sea area through scaling of the wave field; for the wave surface of one radial direction, utilizing change of the displacement gradient to detect the extreme value of the wave surface, and according to the difference between adjacent two maximum values and minimum values, obtaining the wave height at different positions; utilizing the sum of two sine functions to fit the wave surface between the adjacent minimum wave heights, and identifying the area as a wave group when the fitting parameter accords with the wave theory; and combining with observations at different times, obtaining the parameters of the wave group, such as amplitude, length and group speed. The navigation X-wave-band radar wave group detection method based on a wave theory utilizes the buoy to perform scaling on the main modal of the wave field so as to obtain the wave height information of a large area in the observed sea area, and then utilizes the two sine functions which are approximate in frequency based on the wave theory to determine the wave group without requirements for selecting a threshold according to the experience, and has the advantages of being simple and easy to do, and being wide in the application range.

The invention discloses a method for the non-contact wave velocity extraction of a surface wave of an anisotropic material, and the method belongs to the technical field of nondestructive examination. The requirement of the anisotropic material cannot be met by adopting destructive methods such as stretching and the like. In the nondestructive examination for mainly measuring the wave velocity of an acoustic wave, a V(z) curve formed by the interference of a leaky surface wave and a directly reflected wave comprises much information at the characteristic aspect of the material, and the method can be applied to the examination of mechanical properties such as the elastic constant and the like of the anisotropic material by using an ultrasonic microscope as a wave velocity measuring tool. A V(z) curve theory is introduced into the wave velocity measurement of the surface wave of the anisotropic material, so that the propagation velocity of the surface wave at different angles can be obtained, and the anisotropy of the material is represented through an angle-wave velocity curve. By using the method, the wave velocity of the surface wave of the anisotropic material can be extracted in a wide frequency scope; a single-frequency point-by-point way is replaced; different frequency ranges can be set to carry out the wave velocity extraction; an averaged value is selected as the wave velocity of the surface wave at one angle; and the random error caused by an accidental factor is avoided.

A transmission line for propagating a terahertz wave generated based on a carrier generated in a carrier generation layer includes a first region in which the terahertz wave propagates in a first direction and a second region having a different impedance compared to the first region and forming a reflection interface with respect to a terahertz wave which propagates opposite to the first direction. The transmission line is formed so that a distance from an irradiation location at which light is irradiated to the carrier generation layer to the reflection interface is smaller than D, where D is a distance converted from a half width of a time waveform of a terahertz wave which propagates in the first direction without passing through the reflection interface. Accordingly, a terahertz wave can be made to propagate with energetic efficiency, to a direction the terahertz wave is required to propagate.

The present invention relates to a method for selecting sound source frequency, used in the cased-hole dipole shear wave acoustic log. Said invention is characterized by that said method includes the following steps: firstly, utilizing acoustic moveout curve to give out compressional wave velocity of said well: then utilizing velocity field equation under the column coordinate and boundarg connection condition under the condition of cased-hole and adopting three-dimensional velocity-stress finite difference method to numerically simulate the dipole acoustic all-wave wave field of oil-water well, then utilizing the quick and slow flexural waves obtained by means of numerical simulation under the condition of that the circumference of cased-hole has abonormal stress to make dispersion analysis; then utilizing the freguency of cross point of quick and slow flexural waves to define main frequency of sound source.

The invention provides a system and a method for inversion of p-wave and s-wave velocities of elastic waves under polar coordinates, and belongs to the field of oil exploration. The method comprises the following steps of inputting initial p-wave and s-wave velocity models and multi-component seismic records; carrying out mesh generation under a polar coordinate system; converting the initial p-wave and s-wave velocity models into the polar coordinate system; computing a p-wave and s-wave gradient formula under the polar coordinate system; computing a weighted velocity step length; updating the p-wave and s-wave velocities under the polar coordinate system and judging whether an error condition is met; converting the inverted p-wave and s-wave velocities into a Cartesian coordinate system;and outputting the inverted p-wave and s-wave velocities. According to the system and the method, the velocity inversion difficulties in some special geological environments such as a borehole environment, a tunnel space and the like can be well solved; and meanwhile, a multi-component method is introduced into the system and the method, so that the p-wave and s-wave velocities can be inverted atthe same time, the more real and accurate p-wave and s-wave velocities can be obtained, and a foundation is provided for imaging and interpretation of special geological structures such as the borehole environment, the tunnel space and the like.

The invention discloses a device for calibrating a wave height and a wave period of a wave buoy. The device comprises a wave simulating device, a motor, a braking device, a controller device and a terminal control device, wherein the wave simulating device comprises buoy carrying platforms, a swing mechanism, a north half ring shaft, a double-ring truss mechanism and a south half ring shaft. The device can be used for vividly simulating movement tracks of the wave buoy on a sea surface, and ensures that the wave buoy can swing on the basis of a translational motion, with regulated swing angle, when rotating along with the calibrating device, so that the sine characteristic movements of waves are accurately simulated, and the wave height and the wave period of the wave buoy are accurately measured and calibrated; and after the wave buoy is clamped once, the wave buoy can be transferred to a next detection point without being detached. The device is capable of calibrating the wave buoy within a wave height range of 2m to 10m and a wave period range of 3.7s to 60s. The rotating direction of the device is changeable, so that the device can be used for correspondingly simulating two opposite wave directions.

The invention discloses a parallel computing method for a time-varying multi-scale electrically-large-area sea-surface electromagnetic scattering vector field. The method comprises the following steps: building a gravity wave sea-surface model; determining a cutoff frequency k<c> of gravity waves and tension waves, solving coherent scattering under the gravity waves through Kirchhoff, and approximately solving Bragg scattering of the tension waves through small disturbance; modulating a tension wave spectrum through the gravity waves to obtain a vector filed of the tension waves under surface elements; making a surface element shielding judgment through a Z-BUFFER method; and determining an amplitude and a phase of the vector field under the surface elements according to a vector overlapping principle of the field. According to the method, the tension waves are modulated through the gravity waves on the basis of the characteristics that the tension wave spectrum is modulated through the gravity waves and an electrically-large-area rough sea surface has a time-varying multi-scale echo characteristic, and a scattering field and a Doppler spectrum of the large-area rough sea surface are computed in parallel through the Kirchhoff and a small disturbance approximation method in conjunction with CUDA (Compute Unified Device Architecture), so that radar echo characteristic analysis of the time-varying multi-scale electrically-large-area rough sea surface is realized.

The invention relates to a multi-wave stacking intermittent recharge construction method based on water level control. By the aid of the multi-wave stacking intermittent recharge construction method, recharge efficiency is effectively improved to the greatest extent on the premise that a recharge target is achieved. The method includes the specific steps: (1) determining relevant hydrogeology parameters of a precipitation recharge target stratum by means of field pumping tests; (2) inversing parameters of relevant strata by the aid of numerical simulation software and determining the parameters of the target stratum; (3) carrying out field recharge tests for single wells and group wells and numerical simulation, verifying a model, and simultaneously determining the optimal recharge mode, recharge frequency and single recharge time interval; (4) realizing numerical simulation of a recharge scheme and optimizing the recharge scheme; and (5) carrying out field recharge and simultaneously arranging a plurality of observation well according to needs. The relevant hydrogeology parameters include a permeation coefficient, a water storage coefficient and the like. A principle of the method is definite, the method is high in applicability, recharge efficiency can be improved under conditions of original recharge equipment by means of changing an original recharge construction method, simultaneously, recharge is controlled by means of observing recharge water level via the observation wells, dual purposes of controlling surface subsidence and guaranteeing pit safety are achieved to the greatest extent, and the working method is economical.

The invention discloses a method for inversion of a surge wave height by a high frequency ground wave radar. The method comprises the following steps: selecting a high frequency ground wave radar echoDoppler spectrum for inversion and performing independent calculation on each radar echo Doppler spectrum to determine a noise level at a given time and place; with a high-energy Bragg single peak asa reference, carrying out de-ocean-current processing on the radar echo Doppler spectrum; screening out a spectrum capable of carrying out follow-up spectrum shape analysis; identifying a surge spectrum peak in the spectrum; determining an actual measured position of the spectrum peak; carrying out quality checking on the actual measured position of the spectrum peak; carrying out calculation toobtain a surge angle; and calculating the surge wave height. According to the invention, with the high-frequency ground wave radar for observing the surge, a novel way is provided for providing surgeobservation data and the observation precision of the sea surface wave is improved by assisting the way effectively. The method has the important practical and scientific values.

A method for testing a high-pass test chip of the single-cell travelling wave dielectric spectrum comprises the following procedures: respectively connecting each terminal of the test chip to the source end of the sinusoidal voltage signal which has same frequency to lead to that the advance mount or hysteresis amount of the phase between random two adjacent electrodes is equal, dripping the liquid sample containing the cell to be tested into the inner part of the test chip from the injection port (06), then projecting light pattern to the cell initial collection area (32) at the central areaof the electrode group (10), projecting a plurality of strip light patterns (31) with width about the cell diameter from the lower part of the chip substrate (01) to the microelectrode group (10) to form a virtual electrode array, regulating the frequency of a waveform generator, and at the same time recording the horizontal moving image of all cells in the frequency band through a CCD and an image recorder on a microscope. If the cell number of the completed test actually has already satisfied the requirement of the test, then the test procedure ends.

A horizontal shear guided wave thickness measuring method based on an electromagnetic ultrasonic transducer solves the problem that the existing electromagnetic ultrasonic body wave thickness measuring method can not measure thickness of metal test pieces with the thickness less than 10mm. The method comprises 1 calculating an excitation equation of horizontal shear guided waves; 2 drawing an excitation curve; 3 calculating and solving a group velocity equation of the horizontal shear guided waves; 4 exciting and receiving the horizontal shear guided waves in a reference test piece with known thickness and drawing a velocity-thickness corresponding relation curve; 5 measuring the maximum velocity and the minimum velocity of the reference test piece, obtaining the propagation velocity according to the velocity-thickness corresponding relation and calculating location coefficients; 6 measuring the maximum velocity and the minimum velocity of a test piece to be measured and obtaining the propagation velocity of the test piece to be measured according to the location coefficients; 7 calculating the thickness of the test piece to be measured according to the propagation velocity of the test piece to be measured through the velocity-thickness corresponding relation curve. The horizontal shear guided wave thickness measuring method can achieve the thickness measuring purpose of the test piece with the thickness less than 10mm.

In a microbe and cell function control device, a primary electromagnetic wave radiation member is provided to radiate electromagnetic wave on microbes and cells within a predetermined wave length range thereof. An electromagnetic wave measuring member measures an intensity of a predetermined range of the electromagnetic wave permeated or reflected from the microbes and cells. An absorption intensity distinction member determines wavelength the microbes and cells absorb based on the intensity of the electromagnetic wave measured by the electromagnetic wave measuring member. A secondary electromagnetic wave radiation member radiates the electromagnetic wave absorbed by the absorption intensity distinction member on the microbes and cells.

The invention relates to a method for using higher standing wave resonance for quantitatively detecting the thickness of elastic plates, which comprises the following steps: exciting vertical waves in the elastic plates through a sheet-shaped vertical wave piezoelectric transducer; transmitting the vertical waves in the elastic plates to the other surface of the elastic plates to be reflected and forming the standing wave harmonic vibration in the elastic plates; then, using a impedance analyzer or network analyzer for obtaining a higher standing wave resonance modes of the elastic plates; then, calculating the effective electromechanical coupling coefficient of each higher standing wave resonance mode; obtaining the parallel connection resonance vibration frequency of the resonance mode corresponding to the largest effective electromechanical coupling coefficient; and obtaining the thickness of the elastic plates according to the vertical wave sound resistance relationship of the sheet-shaped vertical wave piezoelectric transducer and the detected elastic plates in the thickness direction. The detection of the invention has higher sensitivity, in addition, the equipment is simple and can be easily realized, the sensitivity is high, and the observation is easy. The standing wave resonance of the elastic plates in the invention is sensitive to the surface conditions, and the corrosive conditions of the surfaces of the elastic plates can be marked.

Method for removing air wave noise from shallow water controlled source electromagnetic survey data, using only the measured data and conductivity values for sea water (140) and air. The method is a calculation performed numerically on CSEM data and resulting in an estimate of those data that would have been acquired had the water layer extended infinitely upward from the seafloor. No properties of the sub-sea sediments are used. Synthetic electromagnetic field data are generated for (a) an all water model (141) and (b) an air-water model (146-147) of the survey region. These simulated results are then used to calculate (148-150) electromagnetic field values corresponding to a water-sediment model with water replacing the air half space, which represent measured data adjusted to remove air wave noise.

The invention relates to the technical field of assessment of wave energy resources, in particular to an effective wave height, mean wave period and wave direction based parameterized joint distribution model. The parameterized joint distribution model is produced in the following steps of S1, structuring edge distribution fHs (hs) and fTm (tm) of the linear-variable effective weight height and the mean wave period; S2, structuring edge distribution f theta (theta) of circular-variable wave direction; S3, structuring joint distribution cHs-Dir (u, v) and cTm-Dir (v, w) of the effective wave height and wave direction and the mean wave period and wave direction, conditional distribution hHs / Dir (u / v) and hTm / Dir (v / w) of the effective wave height as well as wave direction and the mean wave period and the wave direction, and two-dimensional conditional distribution cHs-Tm / Dir (hHs / Dir (u / v) and hTm / Dir (v / w) of the effective wave height, the mean wave period and the wave direction; S4, structuring a three-dimensional joint distribution model of the effective wave height, the mean wave period and the wave direction. The thee main elements like effective wave height, the mean wave period and the wave direction are considered, and wave conditions can be accurately described.

The invention discloses a method of extracting the shear wave velocity of dual-spaced full-wave train logging based on slowness- time, comprising S1, reading the first wave of the log data, and obtaining longitudinal wave velocity Vp based on the time difference between the dual-spaced two probes; S2, calculating the degree of correlation between different time waveforms; S3, determining the corresponding longitudinal wave energy mass development position based on the first wave extracted in step S1; S4, enclosing the transverse wave mass based on the longitudinal wave velocity and the development range of the transverse waves on the time shaft; S5, separately extracting and integrating the longitudinal and transverse energy mass on the slowness- time correction spectrum to get correlation coefficient curve of the separated longitudinal and transverse waves in the slowness domain; and S6, extracting the transverse wave peak to get the slowness of the transverse wave, and converting the slowness into velocity to get the transverse wave velocity of dual-spaced full-wave train logging. The invention had the advantages of reduced human intervention and accurate and stable transverse wave velocity results.

The invention provides a fundamental wave determining method for jacket platform frequency spectrum fatigue analysis. The method includes the steps that firstly, sea condition data are obtained; secondly, the sea condition data are processed; thirdly, wave spectra corresponding to sea conditions in all single directions are calculated; fourthly, the height of single rule waves of each sea condition and probability distribution of the cycle of the corresponding wave in each single direction are obtained; fifthly, the number of the single rule waves is calculated; sixthly, the heights of the same single rule waves and the numbers of the single rule waves of the corresponding wave cycles are accumulated, and a distribution histogram of the heights of the single rule waves, the wave cycles and the wave numbers is obtained; seventhly, the numbers of the single rule waves are expressed in a percentage mode according to the corresponding relation of the heights of the single rule waves and the number of the waves in each wave cycle, and the heights of the fundamental waves which exceed the percentage with the determined cycle are determined. According to the fundamental wave determining method for the jacket platform frequency spectrum fatigue analysis, a calculation result is not affected by the non-linear relationship between the heights of the ocean waves and wave force, and the accuracy of frequency spectrum fatigue analysis calculation is ensured.

The invention belongs to a petroleum exploration data processing technology, and in particular relates to a method for calculating a velocity ratio of a longitudinal wave to a transverse wave by using non-zero wellhead distance data. The method comprises the following steps of: acquiring a three-component earthquake record subjected to static correction, performing first arrival pickup, synthesis and reverse convolution, sequentially arranging coordinate parameters of pickup points obtained from an in-phase shaft of up converted waves from shallow to deep, and calculating the velocity ratio of the longitudinal wave to the transverse wave between adjacent shot points and between detection points by acquiring the time when the in-phase shaft is reflected by a wave field of the up converted waves. By the method, the velocity ratio of the longitudinal wave to the transverse wave is calculated by directly using the up PSv wave pickup time of a non-zero wellhead distance without a transverse wave hypocenter; almost all the VSP data of the three-component non-zero wellhead distance are provided with up converted waves and can be obtained more easily than down converted waves; the velocity ratio of the longitudinal wave to the transverse wave has a low requirement on the precision of the time parameters of the up converted waves; and therefore, the method is easy to implement.

The invention discloses a sea wave slope inversion method based on an improved quasi-mirror-image sea surface scattering model. According to the method, four-order approximation expansion is performed on structure functions of sea-surface random height based on a backscattering coefficient of a physical optical model to obtain a backscattering coefficient of a four-order geometric-optical model, truncation effects exist when radars observe (the radars cannot see sea waves smaller than electromagnetic wave lengths), slope variance of filters is defined to replace previous model parameters, sea surface anisotropy and quasi-gaussian distribution characteristics are considered to obtain the improved quasi-mirror-image sea surface scattering model FGO4, the improved model, a certain incidence angles and air speed ranges are applied to inversion of sea wave quasi-gaussian slope parameters. According to the method, accuracy of a low-angle sea surface scattering analysis model is improved, the sea wave quasi-gaussian slope parameters are successfully inversed based on the model, and more accurate sea wave slope parameters are provided for other research.

The invention belongs to the technical field of peanut planting, and particularly relates to a winter greenhouse planting method for selenium-enriched peanuts. The method specifically comprises the following steps that 1, in early December, peanut seeds are soaked in a seed soaking agent, ultrasonic waves are introduced for ultrasonic treatment, filtrate is fished out, the seeds are aired until nowater exists on the surfaces, and to-be-sown peanut seeds are obtained, wherein the seed soaking agent is prepared from ferulic acid, sodium selenite, gallic acid, sealwort polysaccharide, gynostemmapentaphyllum polysaccharide, citric acid chelated copper and water; 2, planting land is processed before sowing, and sowing is carried out; 3, after peanut seedlings emerge, fertilizer liquid is usedfor root irrigation treatment, and the fertilizer liquid is used for foliage spraying treatment in the flowering phase, wherein the fertilizer liquid is prepared from sodium selenite, copper chloride, urea, ascorbic acid phosphate magnesium, Korean monkshood root polysaccharide, chlorogenic acid and water. The contents of selenium, iron and vitamin C of the peanuts can be effectively increased, the nutrition and health care value of the peanuts is improved, and high yield of the peanuts is achieved under winter planting conditions.

The invention relates to a rice milk and a preparation method of the rice milk, in particular to an edible mushroom flavor nutrient rice milk and a preparation method of the edible mushroom flavor nutrient rice milk. The nutrient rice milk comprises the following raw materials in following parts by weight: 800 to 1200 parts of fried corn flour, 400 to 600 parts of fried rice flour, 400 to 600 parts of fried millet flour, and 24 to 320 parts of dried cordyceps militaris. The preparation method of the nutrient rice milk comprises the following steps of crushing the dried cordyceps militaris by a machine, sieving, uniformly mixing with water, treating by ultrasonic wave, hydrolyzing to obtain the cordyceps militaris hydrolyzate; compounding the fried corn flour, the fried rice flour and the fried millet flour to obtain the compound flour; mixing the cordyceps militaris hydrolyzate and the compound flour, granulating, drying by hot air, crushing and sieving. The nutrient rice milk provided by the invention has the advantages that the flavor is particular, the nutrition is complete, the healthcare effect is realized, various nutrient elements required in daily life can be provided for a human body, multiple types of bioactive matters can be provided, and the important function is realized for maintaining the health of the human body. The preparation method is simple, and is suitable for application and popularization.

The present invention relates to a mechanical transverse wave imaging method before steady-state in the magnetic resonance elastic image technology, belonging to the field of bio-engineering technology. Said invention is characterized by that when the MRE image-formation is made, the imaging time can be controlled, so that before the moment of that the mechanical transverse wave is reached to tissue boundary, the wave image-formation is implemented, in which the time of that the mechanical transverse wave is reached to boundary can be obtained by utilizing anatomical structure size of tissue and wave speed calculation obtained by steady-state wave image-formation, on this basis, according to the set mechanical transverse wave frequency the number of cycles of the mechanical vibration and number of kinetic sensitive gradient pulses in the pulse sequence can be calculated so as to set the wave imaging sequence parameter before steady-state and make the mechanical transverse wave be imaged.

The invention discloses a method for extracting random irregular wave characteristic parameters. The method comprises the following steps: firstly, inputting a significant wave height and a wave energy spectrum corresponding to a sea state of a grade that a random irregular wave expects to meet; secondly, calculating a wave amplitude, a frequency and a wave number divided by a corresponding frequency, and inputting a phase angle; secondly, generating a wave surface coordinate by using a wave surface equation of random irregular wave movement, extracting wave heights of the irregular wave by using the wave surface coordinate, arranging the wave heights from large to small, extracting 1 / 3 of all wave heights from large wave heights, and calculating a mean value; finally, recording the mean value of 1 / 3 parts of corresponding wave heights of ten continuous wave heights, and judging whether a stable deviation between an obtained mean value and a significant wave height of a provided sea situation is smaller than a provided deviation or not, thereby obtaining a wave surface coordinate of a sea situation of an expected grade. By adopting the method, random irregular wave characteristic parameter extraction is achieved, and precise coordinate parameters of random irregular waves of corresponding sea situations of different grades are generated.

The invention discloses a measuring device and a measuring method for electromagnetic wave frequency attenuation with a propagation distance. The device comprises an electromagnetic wave signal generating device, a multi-level electromagnetic wave transmission channel and a signal processing device; the electromagnetic wave signal generating device generates a single-frequency electromagnetic wavesignal source; the single-frequency electromagnetic wave signal source is amplified, one channel is transmitted to the multi-level electromagnetic wave transmission channel, and the other channel istransmitted to a signal processing device; the multi-level electromagnetic wave transmission channel transmits the input electromagnetic wave signal in multiple levels and outputs the electromagneticwave signal to the signal processing device; the signal processing device draws a dynamic Lissajous figure according to the received two electromagnetic signals, measures a phase angle accumulated value of the electromagnetic wave signal frequency according to the number of flips and a position shape of the Lissajous figure, calculates the attenuation of the frequency of the electromagnetic wave signal according to the phase angle accumulated value, and converts the relative change amount of the electromagnetic wave signal frequency attenuation into the relative change amount of the electromagnetic wave wavelength on the basis of to a red shift relationship.

A panel assembly includes a first panel defining a surface, and a boom attenuation panel. The boom attenuation panel includes a circumferential edge, and a central portion. The boom attenuation panel is attached to the surface of the first panel, along the circumferential edge of the boom attenuation panel. The central portion of the boom attenuation panel is spaced from the surface of the first panel a gap distance to form a gas chamber between the surface of the first panel and the central portion of the boom attenuation panel. The gas chamber contains a gas that is moveable within the gas chamber in response to wave-like motion of the first panel. Movement of the gas increases the effective acoustic mass of the boom attenuation panel, and damped the wave-like motion of the first panel, which operates to reduce noise generated from the wave-like motion of the first panel.