4results about How to "Ensure handling stability" patented technology

The invention provides a vehicle steering auxiliary control method, system and device and a medium. The method comprises the steps of obtaining driving data of a vehicle on a current road; determining a pavement adhesion coefficient of the current road according to the driving data; determining a front wheel superposition torque and a rear wheel rotation angle of the vehicle according to the road adhesion coefficient and the driving data; and cooperative control torque is determined according to the front wheel superposition torque and the rear wheel rotation angle, and steering auxiliary control is conducted on the vehicle. The front wheel superposition torque and the rear wheel rotation angle adaptive to the road surface conditions are calculated for different road surfaces through the road surface adhesion coefficient, cooperative control is performed based on the front wheel superposition torque and the rear wheel rotation angle, and the overall operation stability and safety of the vehicle are guaranteed.

The invention discloses an intelligent fusion navigation filtering method and system for complex environment transition. Navigation data and environment data are collected by a sensor arranged on ocean equipment, preliminary navigation state estimation is obtained after the navigation data passes through a strapdown inertial navigation module, and local error state estimation and filter health degree are obtained after the navigation data and the navigation data are input into a parallel sub-filter; combining the navigation data and the environment data with the health degree of the filter to serve as fusion data, inputting the fusion data into a reinforcement learning agent to obtain a dynamic fusion weight, performing weighted fusion on the plurality of local error state estimations by using the dynamic fusion weight, and superposing the fusion data on the initial navigation state estimation to generate a final navigation result. According to the method, the optimization mapping relation between the environment characteristics and the filtering weight is directly learned through the reinforcement learning agent, integrated self-adaptive adjustment from environment perception to fusion decision is achieved, and the estimation precision and robustness of a navigation system in dynamic complex environments such as a bay-ocean transition section are effectively improved.

This invention provides a method, apparatus, equipment, and storage medium for assessing traffic resilience and delay costs under rainfall-induced urban flooding. The method includes: acquiring rainfall data for a target area; performing runoff generation and confluence simulations based on the rainfall data to obtain the water depth; determining a safe driving speed corresponding to the water depth based on the water depth and a speed-depth mapping model; the speed-depth mapping model determining a safe driving speed while ensuring vehicle handling stability, wherein the safe driving speed is obtained based on the road water depth and a scaling factor; obtaining a travel demand matrix based on the spatial distribution of the population in the target area; determining traffic delay time based on the safe driving speed and the travel demand matrix; and obtaining traffic delay costs based on the traffic delay time. This invention can improve the efficiency and accuracy of assessing traffic resilience and delay costs under rainfall-induced urban flooding.

This utility model discloses a rebound hammer for non-destructive testing of UHPC compressive strength, belonging to the field of concrete engineering testing technology. It includes a hollow shell, an impact rod, an impact hammer, an impact spring, a guide rod, a hook assembly, and a switch. The impact rod is telescopically connected to one end of the shell. One end of the impact spring is fixed, and the other end is connected to the impact hammer. Both the impact hammer and the hook assembly are slidably connected to the guide rod. The hook assembly can slide along the guide rod and engage with the impact hammer. The switch controls the release of the impact hammer by the hook assembly. The free length of the impact spring is 134.4±0.5mm, and the impact length after stretching is 140.0±0.5mm. The wire diameter of the impact spring is greater than 1.5mm. The UHPC compressive strength regression equation is: ; the value of c ranges from -0.001 to -0.004, where is the average rebound value of the test area or specimen, is the average carbonation depth of the test area, and is the converted value of concrete strength in MPa. This enables non-destructive testing of the compressive strength of UHPC.