11 results about "Rotation velocity" patented technology

The application provides an image acquisition method and device, a terminal device and a computer readable storage medium. The method comprises: acquiring a speed deviation of a second carrier, the speed deviation being an angular velocity of the second carrier relative to a rotating object; determining a target angular velocity of a first carrier according to the speed deviation and a preset initial motion speed of the second carrier; adjusting a current angular velocity of the first carrier to the target angular velocity, and controlling an image sensor to acquire an image of the rotating object. The image acquisition method provided by the application can acquire the speed deviation of the second carrier carrying the first carrier, thereby adjusting the rotating speed of the first carrier, so that the image sensor carried on the first carrier can work at a stable rotating speed, and the quality of the acquired image is improved.

The application discloses a level environment self-adaptive error compensation algorithm method and device, belongs to the technical field of surveying and mapping services; for solving the problem of measurement jump, lag and overshoot caused by coupling of rotation speed change and angle switching under dynamic working condition. The method comprises the following steps: collecting angular velocity and angle switching data in real time; preprocessing and extracting speed change trend and switching time sequence; constructing a segmented adjustable response characteristic mapping based on double driving variables; combining historical deviation distribution and deviation mode characteristics to correct and fuse the initial compensation value; confirming the effectiveness of the compensation parameters through simulation verification; generating compensation instructions synchronized with the response of intelligent sensors by using time alignment mechanism; finally realizing closed-loop parameter updating based on feedback. The application adaptively adjusts the compensation parameters by sensing the speed change and switching action, significantly improving the measurement continuity, stability and overall accuracy of the level in the dynamic environment.

When the absolute value (|Tt−Tc|) of the difference between the turning time Tt of a log PW and the transport time Tc of the log PW is longer than a reference measurement time Ts, the turning-axis center line measurement time Tm is set to the absolute value (|Tt−Tc|) (Step S120), the rotation speed W of centering spindles 24a and 24b is set to a speed (Ws×Ts / Tm) lower than a reference rotation speed Ws, and also the measurement rotation angle α is set to an angle (αs×Ts / Tm) smaller than a reference measurement rotation angle as (Step S122). When the absolute value (|Tt−Tc|) is equal to or less than the reference measurement time Ts, the turning-axis center line measurement time Tm is set to the reference measurement time Ts (Step S116), the rotation speed W of the centering spindles 24a and 24b is set to the reference rotation speed Ws, and also the measurement rotation angle α is set to the reference measurement rotation angle αs (Step S118).

The invention discloses an ISAR (Inverse Synthetic Aperture Radar) image rotation speed estimation method based on sequence continuity, which depends on a SeqFormer network architecture and is combined with a decomposable instance query mechanism and a cross-frame feature modeling strategy to fully mine rotation consistency and geometric relevance between adjacent frames. According to the method, the rotation dynamic constraint is established among multiple frames of images, so that unified modeling and accurate analysis of continuous rotation features of the target are realized. In the feature extraction stage, a cross-frame feature interaction and fusion mechanism is utilized, the problem of local structure discontinuity caused by noise and shielding is effectively weakened, the morphological integrity of a target in a time sequence is kept, and stable geometric support is provided for rotation estimation. Furthermore, modeling and regression learning are carried out on rotation difference features between adjacent frames, the network can directly output the rotation speed of the target, the complex process depending on calibration or key point matching in a traditional method is avoided, and estimation precision and stability are remarkably improved.

The application discloses a table tennis rotation estimation method based on a motion trajectory and application thereof, and the method comprises the following steps: 1, fitting the relationship between the Magnus force coefficient and the linear velocity and angular velocity of the ball; 2, based on the fitting relationship between the Magnus force coefficient and the linear velocity and angular velocity of the ball, a linear equation group of the direction of the angular velocity vector is constructed by using a new trajectory of the table tennis flight, and the direction angle of the table tennis rotation angular velocity vector is obtained by solving the linear equation group; 3, based on the direction of the table tennis rotation angular velocity vector, a nonlinear function of the rotation angular velocity module is constructed by using the new trajectory of the table tennis flight, and the minimum value of the nonlinear function is solved to obtain the module of the table tennis rotation angular velocity. The application can accurately estimate the rotation speed of the ball in flight, thereby improving the precision of the table tennis trajectory prediction.

Method for estimating angular errors of coders in a looped system including a rotating actuator, an angle coder producing a position measurements, and a calculation device controlling the actuator, said device receiving a setpoint signal and the position measurements, for looping, and calculating in a corrector a control signal. In a test phase, a specific corrector Cω<sub2>rj< / sub2>(q) is synthesised for a constant rotation speed ωrj, the corrector having zero gain at the corresponding frequency and harmonics, resulting in opening the loop, a matrix relation is established between position measurements and a function of parameters characterizing coder errors and torque ripples, the test phase repeats with different rotation speeds, the matrix relations are concatenated producing an identifiable global matrix relation, the parameters are estimated by resolution of the global matrix relation.

The invention relates to the technical field of experimental equipment, in particular to a dynamic shear friction experimental device which comprises a thrust unit capable of pushing an impact rod in the extension direction of the impact rod; the loading rod and the impact rod are coaxially arranged, the first end of the loading rod is provided with a first waveform shaper, and the impact rod can impact the first waveform shaper; the loading rod can impact the second waveform shaper and push the incident rod group to rotate around the central axis of the incident rod group; a sample group can be fixed and clamped between the incident rod group and the transmission rod, and the axial pressure assembly can apply a pushing force for pushing the transmission rod to face the incident rod group. In this way, the problem that control over the pulse duration, amplitude, rotation speed and waveform profile of incident waves in an existing dynamic shear friction experiment is limited greatly is solved, and particularly, the problem that shear and friction behaviors of materials cannot be accurately obtained at the high strain rate is solved.

The application discloses a kind of tropical cyclone evolution whole process three-dimensional wind field wind tunnel simulation device, system and method, the simulation device of the present application, the rotation angle and rotation speed of transverse blade structure are adjusted by driving mechanism, can make air flow after the flow guide of flow guide structure form the wind speed profile in line with the characteristics of tropical cyclone field;The guide angle of vertical blade structure at different heights is adjusted by driving mechanism, and the average wind profile in the wind tunnel and the twist of air flow direction can be changed.The simulation device and simulation system of the present application can realize various wind tunnel effects, including making guide angle change with height as exponential function law, making wind speed twist angle reach maximum on ground, etc., and it is convenient and fast to operate, can effectively improve experimental efficiency, simultaneously has the advantages of low implementation cost, strong use flexibility, high space utilization.

The invention relates to the technical field of air fryer simulation, in particular to an air fryer fan fluid simulation analysis method based on Fluent software, which comprises the following steps: S1, establishing a model; s2, carrying out meshing processing on the geometric model; s3, selecting a k-epsilon turbulence model of an RNG equation in the ANSYS Fluent; s4, adding the air densities and the air viscosities at different temperatures into the ANSYS Fluent; s5, setting a rotation speed, a rotation coordinate and a rotation direction of a rotation domain; s6, torque required by rotation of the fan is set in the monitor, so that the magnitude and the change trend of the torque are detected and recorded in real time during calculation; and S7, setting flow field initialization parameters according to the calculation working conditions. And S8, starting to calculate and solve, and calculating the power required by the converged fan fluid. The method has the beneficial effects that the temperature effect is considered during design, a more practical and accurate calculation result can be obtained, and fan parameters can be accurately optimized.