42 results about "Sinusoidal vibration" patented technology

The invention relates to a hydroelectric main shaft all-condition simulation test system and method, and the system comprises a fixed rack, one side of the fixed rack is provided with a tripping starting detection device, the fixed rack is provided with a hollow three-axis platform, a three-axis excitation system and a rotation driving part, the moving end of the three-axis platform is connected with a hollow floating rack, and a bearing is disposed in the floating rack. The rotation driving part comprises a power part and a main shaft connected to the torque output end of the power part, the main shaft is in transmission connection with the rotating disc, a hydroelectric large shaft used for a simulation test is installed on the rotating disc, and the three-shaft excitation system is used for applying X-direction, Y-direction and Z-direction high-frequency sine excitation loads to the hydroelectric large shaft of the rotating disc. The device is used for overcoming the defects that an existing testing device mainly focuses on vibration loading of a static mechanical device, simulation and performance testing cannot be carried out on dynamic behaviors under the composite working conditions of rotation, vibration and impact of a hydroelectric large shaft, and safety testing and rating cannot be carried out on a hydroelectric generating set sensor and a tripper overspeed protection device.

The application provides a ship structure fatigue strength analysis method and system, which calculates the main engine vibration load and the wave load received by the ship structure based on the ship data, the characteristic data of the ship structure and the global sea state data, then calculates the stress response process under the combined action of the wave load and the main engine vibration load, the spectral density function of the stress response process, each order spectral moment of the stress response process and the zero-crossing rate of the stress response process, then calculates the stress response and the stress response peak of the ship structure under the action of the sinusoidal vibration load, calculates the stress cycle number of the ship structure based on the stress response and in combination with the fatigue life S-N curve, further calculates the fatigue damage under the action of the main engine vibration load, and finally calculates the total coupling fatigue damage under the long-term sea state, and further calculates the fatigue damage of the ship structure under the combined action of the high and low frequency loads, which effectively improves the accuracy and reliability of the ship structure fatigue strength calculation.

The invention provides a mechanical environment test condition conversion system of an attitude control power system, and in the field of aerospace engineering, mechanical environment test condition conversion of the attitude control power system is an important link in a preposed step of an overall design simulation link of the attitude control power system. The conversion system provides a sinusoidal vibration conversion calculation module and a classic impact pulse conversion calculation module for numerical conversion. According to the method, the mechanical environment test conditions of the attitude control power system can be rapidly and professionally designed only by selecting corresponding options and inputting key parameters, the analysis result is visually presented and compared with the result, the design working capacity of the mechanical environment test conditions is reduced through establishment of the system, the design efficiency is improved, and the design cost is reduced. And the design difficulty of mechanical environment test conditions is reduced, and the universality and the accuracy are high.

A control method for a non-sinusoidal hydraulic vibration curve of a mold, relating to the technical field of automation in metallurgical continuous casting. A three-segment linear-sinusoidal composite function is used, wherein one vibration cycle of a position curve thereof comprises three stages: the first stage is a sine-like curve obtained by superimposing a standard sinusoidal function having an angular velocity ω1 with a linear function having a slope (I), the second stage is a sine-like curve obtained by superimposing a standard sinusoidal function having an angular velocity ω2 with a linear function having a slope (II) and an offset (III), and the third stage is a sine-like curve obtained by superimposing a standard sinusoidal function having an angular velocity ω1 and a linear function having a slope (IV) and an offset (V) and connected to the sine-like curve of the first stage at different sampling moments. The method optimizes a non-sinusoidal vibration curve, and achieves a smooth and stable velocity curve for hydraulic cylinder motion, a small peak value, and continuous and smooth acceleration transitions without sudden changes. The control method is simple and easy to implement, has few control parameters, and is convenient to operate.

The application provides a deformable mirror assembly, comprising: a deformable mirror mirror body, a back surface of which is provided with a telescopic piezoelectric actuator, which comprises a plurality of linearly arranged actuating units; a pad, which is arranged on the back surface of the deformable mirror mirror body; a control system, which is used for providing an actuating alternating voltage to the telescopic piezoelectric actuator, so that the sinusoidal vibration of different actuating units adopts random amplitude and random phase; the peak-to-valley maximum amplitude of the mirror surface of the deformable mirror mirror body caused by the sinusoidal vibration overcomes the Rayleigh criterion, and the periodicity of the spatial frequency is destroyed through the randomness of the phase of the actuating unit, so that the homogenization of the light beam speckle is realized when the deformable mirror mirror body is used for light beam deflection. The application also provides a corresponding two-dimensional optical system. The deformable mirror assembly of the application improves the speckle homogeneity in the imaging process and reduces the influence of the speckle.

The invention belongs to the technical field of fiber-optic gyroscopes, and particularly relates to an acceleration-based fiber-optic gyroscope vibration error compensation method and an inertial measurement unit. Based on normal strain, optical fiber dielectric impermeability tensor variable quantity, refractive index variable quantity of light in the fast axis direction and phase variable quantity corresponding to a sensitive axis of an optical fiber gyroscope, quantitative relations between the phase variable quantity and the fast axis direction of the optical fiber and between the phase variable quantity and the length of a micro-section optical fiber are established, and the equivalent value of the stress borne by the optical fiber and the phase difference of an optical fiber ring is obtained; the linear relation between the phase difference equivalent value and the angular velocity to be compensated of the fiber-optic gyroscope is determined, the relation of converting the vibration acceleration to the phase to be compensated is established, and the required compensation coefficient is calibrated by combining a sinusoidal vibration test to compensate the vibration error of the fiber-optic gyroscope. According to the invention, vibration error compensation of the fiber-optic gyroscope can be realized without adding extra devices, and the real-time performance and accuracy of error compensation are improved.

The invention discloses a multifunctional light and simplified tree mover which comprises a frame, a torsional vibration excavating mechanism, a hoisting mechanism, a backfill soil paving mechanism and a traveling mechanism, the traveling mechanism is arranged at the bottom of the frame, the torsional vibration excavating mechanism is movably hinged to the head of the frame, and the backfill soil paving mechanism is movably hinged to the tail of the frame; the torsional vibration excavating mechanism comprises a torsional vibration unit and a scraper knife assembly, the torsional vibration unit comprises a vibration excitation device and a rotary excavating device, the scraper knife assembly comprises a knife shaft and a U-shaped scraper knife fixedly arranged on the knife shaft, the rotary excavating device drives the knife shaft to rotate, and the vibration excitation device is connected with the rotary excavating device and provides sinusoidal vibration for the knife shaft. By arranging the torsional vibration digging mechanism, the hoisting mechanism, the backfilling and soil paving mechanism and the walking mechanism, the whole-process mechanical operation of digging seedlings, hoisting the seedlings, transporting the seedlings, filling and leveling soil holes and compacting the soil holes can be realized, and the operation efficiency is high.

The invention discloses an AFM (atomic force microscope) and a piezoelectric ceramic driving method applied to high-speed feedback of an AFM (atomic force microscope) system, interaction force borne by a probe is enabled to be the same as preset interaction force by controlling the motion depth of piezoelectric ceramic, and the motion depth change of hardness detection piezoelectric ceramic is controlled to accord with a sine curve. Therefore, the movement depth change of the probe is a superposition waveform curve of the movement depth change of the two piezoelectric ceramics. Therefore, surface fluctuation detection and hardness detection of the to-be-detected surface are realized. According to the invention, the motion depth changes of the two piezoelectric ceramics are controlled to be non-interfering motion depth changes, so that the motion depth change (i.e., sinusoidal vibration) for detecting the viscosity of the surface to be detected and the motion depth change for feedback tracking of the appearance of the surface to be detected are two non-interfering motion depth changes. And the stroke of feedback tracking of the to-be-measured surface topography is ensured. Therefore, under the condition that the scanning speed of the atomic force microscope is high, a sample with large surface fluctuation can be measured.

Manufacturing process for corrosion-resistant and low-temperature-resistant continuous cast steel billets for wind power, characterized in that it comprises the following steps: S1, steel production in an electric furnace: oxygen is blown into the electric furnace for decarburization and phosphorus removal; after slag formation, slag is blocked and steel is tapped to obtain a steel melt; S2, low-temperature refining: a low-temperature refining furnace is used for homogenization by blowing argon into a ladle bath, for deoxidation, desulfurization, and removal of inclusions from the steel melt obtained in S1; S3, vacuum degassing: a vacuum degassing furnace is used for gas removal;S4, Continuous casting: the molten steel treated in S3 is continuously cast to form a continuous casting billet, this process comprising three sub-steps: S41, a ladle is transferred to a continuous casting machine for casting and the molten steel passes through a ladle nozzle into a tundish; S42, after a level of molten steel has risen to a starting position for casting, continuous casting begins, with the molten steel flowing into a mold, employing a three-stage crystallization process during crystallization: in an initial stage, i.e., in the first 15 minutes of the total casting time, the mold uses a non-sinusoidal vibration, this vibration process occurring with an amplitude of ±4.5 to 5 mm, a vibration frequency of 120 to 130 min-1 and a correction rate a of 19.6% to 20.3%;In an intermediate stage, i.e., from the completion of the initial stage until 30 minutes before the end of casting, the mold uses a sinusoidal oscillation together with electromagnetic stirring, this oscillation process occurring with an amplitude of ±4 to 4.5 mm, an oscillation frequency of 130 to 140 min-1 and an electromagnetic stirring current of 260 to 270 A; in a late stage, i.e., from the completion of the intermediate stage until the end of casting, the mold uses a non-sinusoidal oscillation, the oscillation process occurring with an amplitude of ±3 to 3.5 mm, an oscillation frequency of 140 to 150 min-1 and a correction rate a of 22.1% to 23.6%; S43, the billet is pulled from the mold and then proceeds to the next process;S5, Aging by slow cooling: a continuously cast round billet is rapidly placed in a slow cooling pit at a temperature of 900 to 950 °C, using a progressive slow cooling approach from very slow cooling to medium slow cooling to weak slow cooling, where the very slow cooling lasts 8 to 9 hours, uses a sealed slow cooling lid and is carried out at a cooling rate of 5 to 8 °C / h, where the medium slow cooling lasts 5 to 7 hours, uses a semi-sealed slow cooling lid and is carried out at a cooling rate of 20 to 30 °C / h, where the weak slow cooling lasts 10 to 20 hours, uses an open slow cooling lid and is carried out at a cooling rate of 50 to 80 °C / h, subsequently yielding a continuously cast steel billet for wind power;wherein in the continuously cast steel billet for wind power, an ACN phase in the range of 0.1 to 5.5 micrometers is formed at a grain boundary, where A in the ACN phase refers to Nb, V, and Ti; wherein within the grain boundary, a copper-rich nanophase in the range of 0.3 to 3.8 nanometers is dispersed and distributed; wherein the constituents of the continuously cast billet in mass percent are as follows: C: 0.085% to 0.096%; Si: 0.18% to 0.20%; Mn: 0.8% to 1.0%; Cr: 0.28% to 0.32%; V: 0.49% to 0.52%; Nb: 0.036% to 0.052%; Mo: 0.38% to 0.42%; Al: 0.025% to 0.035%; Ti: 0.059% to 0.087%; Ni: 0.93% to 0.97%; Cu: 0.11% to 0.17%; N: 0.015% to 0.018%; P: ≤0.007%; S: ≤0.004%; O: ≤20 ppm and the remainder is Fe.

The invention relates to a double-satellite self-series-connection main load-bearing structure which comprises a lower satellite main load-bearing structure, an upper satellite main load-bearing structure and an inter-satellite connecting structure used for connecting the lower satellite main load-bearing structure and the upper satellite main load-bearing structure. The lower satellite main force bearing structure comprises a supporting frame and a plurality of rod pieces arranged on the supporting frame, and the rod pieces are arranged at the corner angles of the lower satellite cabin in the height direction. The satellite main bearing structure comprises a plurality of trusses and a first flange connected with the trusses, the trusses are arranged at the corner angles of the satellite cabin body in the height direction, the trusses are gathered and arranged to form a gathering position, and the first flange is arranged at the gathering position. The force transmission path of the double-star self-series-connection main force bearing structure is simple and direct, the force flow continuity principle and the shortest force transmission path principle are met, and compared with a traditional plate type large storage box supporting structure, the sinusoidal vibration response can be reduced by about 2.5 g.

The present invention relates to a non-sinusoidal vibration method for a continuous casting mold. In each vibration cycle, the vibration waveform consists of six segments of functions. By controlling the motion law of the mold driving device, the mold realizes non-sinusoidal vibration represented by six segments of functions; within 0 ≤ t ≤ t B , the mold moves upward at a constant speed, and the speed is a constant; within t B ≤ t ≤ t C , the mold moves upward with variable deceleration, and the speed curve is a parabola. When it moves to t C , the speed becomes 0; within t C ≤ t ≤ t D , the mold moves downward with variable acceleration, and the speed is a cubic curve; within t D ≤ t ≤ t E , the mold moves downward with variable deceleration, and the speed curve is a cubic curve. When it reaches t E , the speed becomes 0; within t E ≤ t ≤ t F , the mold moves upward with variable acceleration, and the speed curve is a parabola; within t F ≤ t ≤ t G , the mold moves upward at a constant speed, and the speed is a constant, which is a horizontal line.

The invention relates to a very-low-frequency sinusoidal vibration mechanism and a water sound pressure calibration device, and the mechanism comprises a servo motor which is used for providing rotation power; the harmonic reducer is connected with an output shaft of the servo motor and is used for reducing the rotating speed and improving the output torque; the driving shaft is connected with the output end of the harmonic reducer, and a sine curve guide groove is formed in the driving shaft; and the guide crank is provided with a tip part matched with the sine curve guide groove in the driving shaft, and the tip part is matched with the sine curve guide groove to enable the rotary motion of the driving shaft to be converted into the linear motion of the guide crank. According to the sine vibration mechanism, lower vibration frequency and higher stability can be generated, the harmonic reducer and the servo motor are introduced into the sine vibration mechanism for driving for the first time, lower frequency can be generated, and the influence of waveform distortion degree introduced by the sine vibration mechanism is reduced.

The invention relates to a control method for casting powder and a 210-square high-carbon steel continuous casting billet surface slag runner, which comprises the following steps: before a crystallizer copper pipe is replaced, carrying out arc correction on a foot roller; the crystallizer is subjected to vibration debugging, the crystallizer adopts a sinusoidal vibration mode, the negative slippage displacement of vibration of the crystallizer is set to be 3-4 mm, the negative slippage time is set to be 0.12-0.18 s, and it is ensured that the vibration offset of the crystallizer in the X-axis direction, the Y-axis direction and the Z-axis direction is within a preset range; the method comprises the following steps of: entering a continuous casting production link, adding casting powder, setting the binary alkalinity to be 0.5-0.8, the melting point to be 960 + / -30 DEG C and the viscosity to be 0.20 + / -0.05 Pa.s, setting the pulling speed to be 1.15 m / min when the superheat degree of the molten steel is less than 20 DEG C, setting the pulling speed to be 1.10 m / min when the superheat degree of the molten steel is between 20 DEG C and 40 DEG C, and setting the pulling speed to be 1.05 m / min when the superheat degree of the molten steel is more than 40 DEG C. The method can reduce or eliminate the detection rate of the high-carbon steel continuous casting billet slag runner such as bearing steel and grinding ball steel.

The invention discloses an optical material defect identification method for vibration deformation measurement through a time average holographic method, and relates to the technical field of digital holographic measurement, the optical material defect identification method specifically comprises the following steps: simplifying an optical material into a circular thin plate, and obtaining the influence of the surface defect of the circular thin plate on the amplitude; obtaining the influence relation of the exposure time change of the circular thin plate under sinusoidal vibration excitation on the reconstruction effect of the time-averaged hologram; constructing a digital holographic reflective optical path; respectively shooting time average holograms before and after vibration deformation of the to-be-detected sample; extracting interference information of the to-be-detected sample; inverse Fourier transform is carried out to obtain complex amplitude distribution, phase extraction is carried out, and the phase difference before and after vibration deformation is calculated; and based on the phase difference before and after the vibration deformation, obtaining the occurrence position of the surface defect of the to-be-detected sample to realize defect identification. According to the invention, the identification of different types of defects is realized by positioning the areas with obviously abnormal phase difference stripes.

The embodiment of the invention provides a spacecraft three-axis sinusoidal vibration test system and method, and the system is characterized in that the system comprises a main working platform, a connecting assembly, a plurality of vibration tables, a cooling sub-module, an oil pump sub-module, a power amplifier sub-module, and an MIMO vibration control sub-module; the spacecraft is connected with the main working platform through the connecting assembly, the spacecraft is located above the multiple three-way force measuring sensors, and the multiple vibration tables are controlled to conduct full-magnitude vibration tests based on preset requirements on the basis of preset three-axis sine test conditions so as to test relevant parameters of the spacecraft. The embodiment of the invention ensures that the product is fully and widely excited from all angles of the three-dimensional space, so that the space motion of the spacecraft fills the whole three-dimensional physical space, the track is richer, the assessment is more effective, and compared with the traditional uniaxial test method, the mechanical test efficiency and the batch production development efficiency of the spacecraft product are greatly improved.

The application provides an aero-engine accessory sine vibration endurance test time calculation method, and belongs to the technical field of aero-engines. The method comprises the following steps: determining the structural parameters of an aero-engine and the range of high and low pressure rotating speeds; determining the load profile and vibration value of the engine vibration environment; determining the sine vibration fatigue frequency of the aero-engine accessory; determining the resonance frequency of the accessory product; obtaining the fixed frequency acceleration total equivalent test time of the resonance frequency point; obtaining the acceleration vibration scanning cycle test time; and determining the vibration endurance test time according to the fixed frequency acceleration total equivalent test time and the acceleration vibration scanning cycle test time. The method provided by the application solves the problem that the current sine vibration endurance time determination is not scientific and reasonable, and improves the effectiveness and accuracy of the vibration endurance test of the engine accessory.

One aspect of the invention relates to a massage apparatus (10) comprising a massage head (1) and a control system (2), the massage head (1) being intended to be applied to a subject's skin, wherein the control system (2) is configured to control the massage head (1) such that a depression is generated in the massage head (1) according to a depression function representing a temporal variation of the depression generated in the massage head (1), wherein the control system (2) is further configured to add, to the depression function, a sinusoidal vibration with a frequency between 25 Hz and 45 Hz. Figure to be published with the abstract: Figure 2

The application provides a whole-satellite vibration reduction device based on a vibration absorption plate and a crab claw truss structure, which is composed of a bottom plate, a crab claw truss and a vibration absorption plate. The crab claw truss is connected with light-weight joints through hollow carbon fiber square tubes (containing inclined upper rods, horizontal rods, vertical rods and the like), and bears a 100L large-capacity storage tank through a storage tank flange. The vibration absorption plate is connected with the inclined upper rods of the truss through a single-point connection of an in-plate embedded part and a connection joint in a non-stiffener structure of a 20mm-thick honeycomb plate and a 0.3mm aluminum skin, forms a minimum rigidity point in the axial direction of the storage tank, and concentrates the absorption of sinusoidal vibration energy through the "drum skin effect". The bottom plate serves as a basic support and is rigidly connected with the main load-bearing rods of the truss through joints to ensure the stability of mechanical conduction.

The present invention discloses a high anti-vibration structure for a circuit breaker, characterized in that: it includes a limit lock assembly, the limit lock assembly includes a limit lock (1), the limit lock (1) is connected to a limit compensation piece (2), a lock groove (3) is provided on the limit lock (1), the lock groove (3) is connected to a linkage buckle piece (4), the lower end of the lock groove (3) of the limit lock (1) is inclined, and the inclination angle β between the lower end of the lock groove (3) and the limit lock (1) is 2-11°. The structure of the present invention is simple and has excellent performance indicators, and can meet sinusoidal vibration: (10-500) Hz, 0.75 mm / 10 g; (10-2000) Hz, 0.75 mm / 15 g; random vibration: 0.2 g<supgt;2< / supgt> / Hz (10-2000 Hz); acceleration: 17 g; shock: 75 g (11 ms); gunfire vibration: 1.462 g<supgt;2< / supgt> / Hz (30-2000 Hz).

The application discloses a motor haptic vibration generation method and device based on a second-order damping model and a storage medium. A vibration parameter structure body and a motor vibration operation state structure body are predefined; a vibration triggering instruction for a target motor is received, vibration parameters corresponding to the triggering instruction are loaded to the vibration parameter structure body of the target motor, and a vibration activation flag is set; if it is detected that the vibration activation flag of the target motor is in a set state, a sinusoidal vibration signal with an exponential decay envelope is calculated and generated based on a second-order under-damped vibration model; the sinusoidal vibration signal is discretized, updated and amplitude-limited to obtain a q-axis current vibration component; the q-axis current vibration component is superimposed on an original torque current instruction in FOC vector control to generate a q-axis current reference value of a current loop, so as to drive the target motor to output corresponding haptic vibration. The scheme has the advantages of reproducibility, configurable parameters, more natural vibration feeling and better system friendliness.

The invention discloses a machine vision method low-frequency angular vibration virtual traceability method based on visual coding, which comprises the following steps: firstly, determining standard low-frequency angular vibration data video parameters according to low-frequency angular vibration characteristics; secondly, a standard display is used for playing a standard low-frequency angular vibration data video, and the motion trail of the high-contrast feature mark in the video is standard sinusoidal vibration; then, collecting a motion sequence image of the standard low-frequency angular vibration data video based on a machine vision method; and finally, realizing sub-pixel-level precision extraction of the feature edge of the motion sequence image by adopting a linear segmentation detection method, and resolving angular vibration information of a high-contrast feature mark in the video by utilizing the extracted sequence image feature edge. By measuring the standard low-frequency angular vibration data video created by the method, the low-frequency vibration measured by the machine vision method can be directly traced to the standard sinusoidal vibration, the magnitude traceability uncertainty chain is greatly shortened, and the magnitude flattening transmission is realized.

The invention provides a method for stably controlling the surface quality of a low-carbon high-nitrogen steel continuous casting round billet, and belongs to the technical field of ferrous metallurgy, the method comprises the following steps: (1) controlling the degree of superheat of a first furnace for casting of low-carbon high-nitrogen steel refined molten steel to be 25-35 DEG C, controlling the temperature of a continuous furnace to be 15-25 DEG C, and controlling the ratio of V / Ti to be 2.5-3.5; (2) full-hydraulic non-sinusoidal vibration is carried out, and As is 0.30-0.45; (3) the consumption of the nano TiO2-ZrO2 composite casting powder is 0.85-0.95 kg / t, and the thickness of a liquid slag layer is 9-11 mm; (4) secondary cooling reference specific water flow is 0.30-0.31 L / kg, and an online nitrogen saturation model is gt; when the temperature is 0.95, the temperature is automatically reduced by 5-10%; (5) the pulling speed is 1.40-1.50 m / min; and (6) the pit entering temperature of a round billet with the diameter phi being 220 mm is larger than or equal to 550 DEG C, and slow cooling is conducted for 20 h or longer. The first-pass yield of the obtained casting blank is greater than or equal to 99.9%, and high-strength structural steel can be directly rolled.

The present application relates to a kind of control methods of protecting slag and 210 square high-carbon steel continuous casting billet surface slag groove, control method includes: before replacing crystallizer copper pipe, arc is carried out to the roll of enough;Crystallizer is vibrated and debugged, crystallizer uses sinusoidal vibration mode, the negative slip displacement amount of crystallizer vibration is set to 3-4mm, negative slip time is set to 0.12-0.18s, ensure that the vibration offset of crystallizer in X, Y, Z three directions is in the preset range;Enter continuous casting production link, add protecting slag, its binary basicity is set to 0.5-0.8, melting point is set to 960 ℃±30 ℃, viscosity is set to 0.20±0.05Pa·s, when the superheat of molten steel <20 ℃, set the pulling speed to 1.15m / min, when the superheat of molten steel is in 20-40 ℃ interval, set the pulling speed to 1.10m / min, when the superheat of molten steel >40 ℃, set the pulling speed to 1.05m / min.The present application can reduce or eliminate the detection rate of bearing steel, grinding ball steel and other high-carbon steel species continuous casting billet slag groove.

The invention provides a whole-satellite damping device based on a dynamic vibration absorption plate and crab claw type truss configuration. The whole-satellite damping device is composed of a bottom plate, a crab claw type truss and the dynamic vibration absorption plate, wherein the crab claw type truss is connected with a light-weight connector through hollow carbon fiber square pipes (including an inclined upper rod, a transverse rod, a vertical rod and the like), and a 100 L large-capacity storage box is borne through a storage box flange; the vibration absorption plate is of a non-reinforcing-rib structure composed of a honeycomb plate with the thickness of 20 mm and an aluminum skin with the thickness of 0.3 mm, the vibration absorption plate is in single-point connection with a truss inclined upper rod connector through an embedded part in the plate, the lowest point of rigidity in the axial direction of the storage box is formed, and sine vibration energy is absorbed in a concentrated mode through the drum leather effect. The bottom plate serves as a foundation support and is in rigid connection with the truss main force bearing rod through the connector, and mechanical conduction stability is ensured.

The invention provides a construction method and a prediction method for a formant prediction model of a spacecraft component, and the construction method comprises the steps: obtaining the measurement point acceleration response data of the spacecraft component in a sinusoidal vibration test, and constructing a multi-task learning model for predicting a formant, and training the multi-task learning model by using the time-frequency domain feature vector. According to the scheme provided by the invention, the formant deviation condition of the response curve can be predicted in advance in the test process, and the abnormal condition of the product can be judged in time.

The invention provides a multi-split conductor vibration excitation device which is fixedly connected with a split spacer frame body, and the vibration excitation device comprises a housing assembly, the outside of which is fixed with the split spacer frame body; the servo motor 2 is fixed on one side in the shell assembly, and a main shaft of the servo motor 2 is perpendicular to the split spacer frame body; bearings at the two ends of the first gear shaft 4-1 are fixed to the shell assembly, and the first gear shaft 4-1 is parallel to a main shaft of the servo motor; the first pinion 5-1 is fixed on a main shaft of the servo motor 2; the second pinion (5-2) is fixed at one end, close to the servo motor (2), of the first gear shaft (4-1) and is meshed with the first pinion (5-1); the first eccentric wheel 7-1 is fixed at the other end of the first gear shaft 4-1; the energy supply control assembly is electrically connected with the servo motor; the excitation device generates excitation force peak value and sinusoidal vibration with adjustable frequency by changing the rotating speed of the servo motor, and is used for gentle breeze vibration simulation test, vibration suppression and line deicing operation of a multi-split conductor of a real-type line.

The invention discloses a device and method for predicting the elastic modulus of a wood composite laminate, and the method comprises the steps: fixing a piezoelectric wafer on the surface of a composite laminate unit, enabling the piezoelectric wafer to be in a free state, enabling the piezoelectric wafer to generate a sinusoidal vibration signal through a piezoelectric driving device, collecting the sinusoidal vibration signal through an acceleration sensor, and transmitting the signal to an upper computer; first three-order inherent frequencies are obtained through fast Fourier transform, a first-order dynamic elastic modulus is calculated to serve as an input parameter of a finite element model, then a geometric model is established through COMSOL, related parameters are input, boundary conditions and loads are set, the model is operated after superfine grids are divided, and a third principal stress and a third principal strain are subjected to volume integration, so that a finite element model is obtained. According to the method, the performance of each composite laminate is detected in a nondestructive mode, physical damage and resource waste are avoided, finite element analysis and finite times of experiments are combined, the detection time and cost are remarkably reduced, and the overall efficiency is improved.

The application provides a kind of accumulator membrane box sine vibration test condition design method and device, comprising: obtaining the low-frequency vibration acceleration flight telemetry time domain data of accumulator membrane box and accumulator shell installation interface;Select typical transient time domain data segment to carry out low-frequency band-pass filtering, and the filtered data is processed by impact response spectrum equivalent sine;The data is processed by maximum envelope;According to the impact response spectrum equivalent sine envelope data of typical transient time, design acceptance level sine vibration test condition;Based on acceptance level sine vibration test condition, determine the identification level sine vibration test condition, complete accumulator membrane box sine vibration test condition design.The sine vibration test condition of the accumulator membrane box is obtained by the design when the ground vibration test is carried out alone, which can improve the over-test condition of the accumulator membrane box caused by the ground vibration test of the accumulator as a whole, and reduce the structure design difficulty and ground over-test risk of the accumulator membrane box.

The invention relates to a small-amplitude pitching vibration coupling control system and a control method, and belongs to the pneumatic field, a special control system is designed, the control system comprises a longitudinal excitation device, a transverse excitation device, a motor controller and an upper computer, through coupling control of the longitudinal excitation device and the transverse excitation device, no matter the conditions of a back support, a belly support or a tail support, the motor controller can be controlled to work, and the control system can be controlled. In addition, in the test process, the pitching vibration test of the model can be completed only by sending sinusoidal vibration instructions to the longitudinal motor and the transverse motor through the motor controller, the test process is simple and easy to implement, and the test efficiency is improved. And a large number of tests show that compared with theoretical values, the actual values of the attack angle and the sideslip angle of the model calculated in the coupling excitation mode have very small error data, and enough precision can be obtained.

The invention belongs to the technical field of metallurgical machinery, and particularly relates to a crystallizer non-sinusoidal vibration method, device and equipment, a medium and application. A speed curve in each period comprises a horizontal straight line AB, an oblique straight line BC, an oblique straight line CD and a horizontal straight line DE which are sequentially connected, and a driving device of the crystallizer is controlled through a curve function to only impact twice in one vibration period. A non-sinusoidal vibration mode is constructed through a four-section function, and a crystallizer driving device is controlled. The non-sinusoidal vibration curve constructed by the method has the characteristics of small vibration acceleration, relatively constant vibration acceleration and small impact on equipment at the same pulling speed; only two times of impact are carried out in one vibration period, so that the number of times of impact is reduced to the minimum, and the method is finally used for design guidance of a non-sinusoidal vibration mode of the crystallizer. The four-section non-sinusoidal vibration curve function constructed by the invention is simple in form and easy to realize, and can meet different vibration requirements.