4 results about "Soil dynamics" patented technology

The application belongs to the technical field of electric digital data processing, and particularly relates to a digital processing system for adaptive depth of a land leveler. The system acquires a tool spindle torque signal sequence and a rack three-axis acceleration signal sequence in real time, extracts a frequency domain feature vector through fast Fourier transform of a sliding window, and inputs a classifier to output a soil dynamics parameter set. The dynamics parameter set is substituted into a state space equation, a torque fluctuation variance minimization and an effective soil breaking volume maximization are taken as double objective functions, a maximum response rate of a hydraulic system and an allowable maximum structural stress are combined to construct a nonlinear programming model. A sequential quadratic programming algorithm is called to iteratively solve and output an optimal loosening depth setting value, which is converted into a hydraulic proportional valve current control sequence through trajectory interpolation. The application suppresses depth control oscillation during operation of soft and hard alternating soil, reduces transient impact load of a transmission system, and balances loosening operation power consumption and soil breaking quality.

This application discloses a method, device, and medium for evaluating the mobility of off-road vehicles based on a dynamic soil model, relating to the field of vehicle mobility evaluation technology. The method includes: calculating the soil cohesion modulus and soil friction modulus corresponding to the vehicle's speed using a dynamic soil bearing capacity model during each speed scan; performing iterative calculations of four-wheel vehicle dynamics and loads to obtain stable settlement and wheel load data; and further calculating the total vehicle resistance. Then, the hook traction force is determined using a dynamic soil shear model. Finally, dynamic constraint tests, comfort constraint tests, and hard passability constraint tests are performed using driver comfort indicators to determine a permissive maximum speed. The above-mentioned solution achieves off-road mobility evaluation that balances soil dynamics and occupant comfort, improving the authenticity and reliability of high-speed off-road mobility evaluation results.

This invention discloses a method for analyzing the dynamic response of deep-sea pile driving soil based on ALE fluid-structure interaction and infinite element boundary, belonging to the field of marine engineering technology. It solves the technical problem of mesh distortion and hourglassing caused by severe soil compression at the pile tip during deep penetration. The key to this technical solution is the introduction of an adaptive mesh technique with an arbitrary Lagrange-Eulerian adaptive mesh control domain. By dynamically refactoring the mesh topology during the analysis step, mesh distortion and hourglassing caused by severe soil compression at the pile tip during deep penetration are effectively avoided, enabling the finite element model to stably simulate the penetration depth process.

The application provides a soil dynamic triaxial multi-physical field coupling mechanical behavior testing device, which comprises a dynamic triaxial pressure unit, a sample unit, a water bath circulating temperature control unit, a permeation testing unit and a wave velocity testing unit. The dynamic triaxial pressure unit comprises an outer pressure chamber connected with an axial force loader and a confining pressure controller, and the axial force loader is connected with a data collector. The sample unit comprises a sample top cap, a soil sample and a sample base. The water bath circulating temperature control unit comprises a temperature exchange chamber used for accommodating the soil sample and filled with silicon oil as a heat transfer medium. The temperature exchange chamber is connected with a temperature control system, and the experimental temperature of the soil sample is regulated by adjusting the water bath circulating temperature. The permeation testing unit is connected with the sample top cap and the sample base, and is used for applying a permeation pressure on the soil sample. The wave velocity testing unit is connected with the sample top cap and the sample base, and is used for exciting and receiving an elastic wave signal in the soil sample.