7 results about "Plate wave" patented technology

The application relates to a kind of active absorption method and equipment of frequency domain filter-based push plate wave generator, and belongs to the field of ocean engineering.The specific process of the method is as follows: a two-dimensional model of active absorption of push plate wave generator is established, and the expression of wave height in front of push plate wave generator is derived.The absorption transfer function of the push plate wave generator of active absorption is derived from the expression of wave height in front of push plate wave generator.The weight distribution combination of all is determined by the target wave to be generated.The error with theoretical displacement under the weight distribution of each combination is calculated by iterative weighted least squares.The optimal solution suitable for the current working condition is determined through error thermal distribution diagram.The application takes the displacement calculated by fitting filter and the theoretical displacement of push plate wave generator as the basis for measuring the effect of active absorption based on weighted iterative least squares, and the optimal filter suitable for target working condition can be automatically fitted through free combination of different frequency bands and weight distribution, without human intervention.

The change in the plate wave shape distribution is evaluated with high accuracy even in the case where vibration is generated on the metal strip. In each of the divided regions obtained by dividing the reflected light region in the plate width direction into j parts, the uppermost position of the upstream side boundary line position of the reflected light region and the uppermost position and the lowermost position of the downstream side boundary line position are found, and for each of the obtained images, the difference between the variation amplitude of the uppermost side boundary line position and the variation amplitude of the lowermost side boundary line position is calculated for each divided region, and is set as information corresponding to the maximum variation amplitude of the reflected light region for the (k)th image, and is made to correspond to the central position in the plate width direction of the divided region i, and when a value indicating the position in the plate width direction is set as a variable x, the position in the plate width direction of the region in the image is normalized to the range of -1 ≤ x ≤ 1 in the plate width range of the region, the value of the information is taken as an index corresponding to the rolling plate wave shape distribution in the plate width direction obtained from the (k)th image, a Chebyshev polynomial is applied to find the coefficients, and the first order coefficient C1' is taken as the detection result signal of the rolling plate wave shape distribution of the first order component in the plate width direction of the (k)th image.

The application provides a vertical multi-plate wave making system with linkage of a rod system and high-precision control and a control method thereof. A computer control system generates a nonlinear wave control signal, and a controller and a driving device are used to independently drive the hinged points on each wave making plate, so that fine adjustment of local movement of the wave making plate is realized, and the vertical velocity and displacement profile of a target wave are highly accurately reproduced by precisely controlling the displacement of each hinged point. Specifically, a transfer function of the swing amplitude of each plate of the vertical multi-plate wave making machine and the wave height is derived by using the ideal fluid potential flow theory of hydrodynamics, the consistent relationship between the swing amplitude of each plate and the ratio of the displacement or velocity of the nonlinear wave vertical distribution, and the geometric invariable characteristics of each wave making plate are combined, and the specific displacement of each hinged point is solved, and then the motion law of the servo motor is obtained according to the geometric nonlinear relationship between the hinged points of the wave making plate and the linkage motion of the servo sliding block, so that the high-precision reproduction of the target wave by the vertical multi-plate wave making system is realized.

The present invention makes it possible to achieve both a wide width between a resonant frequency and an anti-resonant frequency and low spurious. An elastic wave device according to the present invention has a conductor layer and excites plate waves in the SH1 mode. The Euler angles of a piezoelectric body of the elastic wave device are (α) or (β).　(α) (84°–96°, 84°–96°, 21°–45°) or a crystallographic equivalent. (β) (84°–96°, -96°–-84°, -45°–-21°) or a crystallographic equivalent.

The change in the plate wave shape distribution is evaluated with high accuracy even in the case where vibration is generated on the metal strip plate. In each of the divided regions obtained by dividing the reflected light region in the plate width direction into j parts in the obtained image, the most upstream position of the upstream side boundary line position of the reflected light region and the most downstream position of the downstream side boundary line position are found, and with respect to each of the obtained images, the difference between the position data of the most upstream side boundary position and the most downstream side boundary position is calculated for each divided region, the value is set as information corresponding to the maximum rolling direction length of the reflected light region of the kth image, and the information is made to correspond to the central position in the plate width direction of the divided region i. When the value indicating the position in the plate width direction is set as a variable x, the position in the plate width direction of the region in the image is normalized to the range of -1 ≤ x ≤ 1 in the plate width range of the region, the value of the information is taken as an index corresponding to the rolling plate wave shape distribution in the plate width direction obtained from the kth image, a Chebyshev polynomial is applied to find the coefficients, and the first order coefficient C1' is taken as a detection result signal of the rolling plate wave shape distribution of the first order component in the plate width direction of the kth image.

The application discloses a new type of hydraulic driving swing plate wave making device and relates to the field of soil centrifugal simulation test devices. The traditional linear hydraulic wave making device mechanism is prone to problems such as jamming, liquid leakage, wave form transmission distortion and the like when running at high speed under a super gravity field. The application utilizes the natural anti-centrifugal force characteristics of a servo hydraulic swing cylinder, and uses a heavy load cylindrical rod to directly hinge a wave making plate and the hydraulic swing cylinder, thereby simplifying the transmission mechanism, overcoming the non-uniform deformation of the linear hydraulic mechanism and the transmission mechanism under a super gravity field, and overcoming the above-mentioned problems such as the existence of high-order harmonics in wave form transmission. The application has the advantages of stable and reliable mechanism and small deformation, improves the transmission efficiency and service life of the equipment, and can realize high water depth, high frequency and large amplitude wave making under a super gravity field.

The invention discloses non-uniform-speed wave making equipment based on a bidirectional cam groove and an arc-shaped plate, and belongs to the technical field of wave simulation. The equipment comprises a wave-making water tank and a wave-making device, wherein the wave-making device comprises an arc-shaped wave-making plate and a driving system; the driving system adopts a two-way groove-shaped cam-double crank sliding block composite mechanism, through a double-cam groove with a specific asymmetric outline, constant-speed rotation of a motor is directly converted into non-constant-speed rectangular linear reciprocating motion of a wave making plate, and the dynamic rhythm of'fast-rising and slow-falling 'of natural waves is accurately simulated. Meanwhile, the arc-shaped wave making plate effectively reduces water resistance and energy loss. The problems that a traditional push plate wave maker is single in motion characteristic, distorted in waveform and low in efficiency are solved, dynamic and vivid test waves with high wave surface quality can be generated, and the simulation degree and reliability of a physical model test are remarkably improved.