3results about How to "Improve description accuracy" patented technology

A twist drill device for detecting the compaction of foundation soil includes a column connected to the drilling rig's transmission. The column is connected to the twist drill via a torque ring, and multiple blades are installed on the twist drill. The torque ring includes a ring body with an internal thread at the top and an external thread at the bottom. A torque sensor and a cavity are installed within the ring body. A Bluetooth module, a power supply, and a microprocessor are housed within the cavity. The torque sensor is connected to the microprocessor, which is connected to a remote smart terminal via the Bluetooth module. This invention directly installs a torque ring device between the drilling rig column and the twist drill. This device can measure the torque and pressure exerted by the column on the twist drill in real time and transmit the torque and pressure data to a smart terminal via Bluetooth technology. This invention solves the problem that core samples obtained using twist drills are in a completely disturbed state, making it impossible for the operator to determine the compaction of the foundation soil on-site.

This invention relates to the field of mechanical transmission and friction and wear analysis, and discloses a method, system, medium, and equipment for constructing a dynamic wear model of a wedge-type one-way clutch. The method includes: establishing an analytical model of the dynamic interface force of the wedge, solving for the force and contact area; obtaining the contact pressure distribution, relative sliding velocity, and contact time of the wedge under different working conditions; constructing a wear volume evolution model over time; introducing a wear constitutive equation to establish a quantitative relationship between contact pressure, relative sliding distance, and wear amount; integrating and coupling the wear volume evolution model, the wear constitutive equation, and the dynamic interface force analytical model, correcting the contact friction coefficient and wear coefficient by temperature field factors, and constructing a multi-physics coupling framework; dynamically updating the contact surface geometry based on the wear accumulation results, and recalculating the contact force and wear parameters to form a continuous iterative wear evolution process. This invention can achieve dynamic and continuous prediction of wedge wear, improving the accuracy of wear assessment under complex working conditions.

This invention discloses a stability determination method and system for an automatic voltage control closed-loop system in a new energy base. The method includes: acquiring system parameters of the automatic voltage control closed-loop system; establishing a discrete state update model including the current cycle control command and the previous cycle control command; constructing augmented state variables and establishing a unified closed-loop discrete mapping relationship considering control laws and limiting constraints; dividing the state space into an unsaturated subspace and a saturated subspace according to whether the control command touches the limiting constraint, and establishing corresponding piecewise discrete mapping relationships; constructing a linear matrix inequality stability criterion for the unsaturated subspace under the condition that the voltage-reactive power characteristics satisfy the bounded incremental sector, and transforming it into a semi-positive definite programming problem to obtain the stability determination result. This invention can accurately characterize the dynamic behavior of the AVC closed loop in a new energy base under the combined effects of sample-and-hold, time delay, and limiting, and realize the analysis and determination of the system's stability state and oscillation mode.