Abstract: Disclosed are an active noise reduction method and device for a vehicle, and a storage medium. The active noise reduction method includes the following steps: generating two reference signals according to a target noise to be denoised; generating a control signal and sending it to a sound reproduction device; filtering the reference signals to obtain filtered reference signals; calculating a noise signal; updating an auxiliary control parameter; calculating an updated auxiliary control parameter-based error signal; and updating the control parameter. The method actively reduces the noise of vehicle engines, reduces interior noise pollution, and has a fast convergence speed.

Abstract: Disclosed are a method and system for controlling vehicle road noise based on active noise reduction. The method includes: acquiring a multi-channel reference signal of vehicle road noise; generating a control signal based on a coefficient of a filter at a current time and the multi-channel reference signal, and feeding to a sound reproduction device of the vehicle; acquiring acoustical signals at a plurality of sampling positions inside a compartment of the vehicle to obtain a vector of an error signal; filtering the reference signal to obtain a filtered reference signal; writing the filtered reference signal in a matrix form; and updating the coefficient of the filter. The method actively reduces the road noise caused by friction between vehicle tires and road surface, reduces interior noise pollution, and has a relatively fast convergence speed and relatively high accuracy.

Abstract: A frame-type bilateral reverse permanent magnet direct current linear motor is provided, including a support frame, an iron yoke assembly with a first iron yoke, a second iron yoke and a middle iron yoke, a permanent magnet group, a coil winding and a pole piece assembly. Two groups of intermediate transition permanent magnet assemblies are disposed between the first iron yoke and the middle iron yoke and between the second iron yoke and the middle iron yoke. The intermediate transition permanent magnet assemblies includes transition permanent magnets and corresponding transition connection iron yokes; and magnetic pole orientations of the transition permanent magnets of the two groups of intermediate transition permanent magnet assemblies are reverse. The linear motor realizes efficient direct-current linear control, and has a high speed, a precise controllability, a high thrust density and small thrust fluctuation, and easiness in assembling.

Abstract: A method and apparatus for vertex reconstruction based on terrain cutting, a processor and a terminal are provided. The method includes: position information of a unit block to be removed is acquired, terrain resources in a game scene are cut into multiple terrain chunks, and each terrain chunk is cut into multiple unit blocks; vertex data of at least one adjacent unit block of the unit block to be removed is determined according to the position information; and at least one triangular patch to be rendered is reconstructed according to the vertex data. The present disclosure solves a technical problem that a terrain change mode provided in the related art is limited within a region of a single plane thereby lacking flexibility and realism.

Abstract: A method and apparatus for vertex reconstruction based on terrain cutting, a processor and a terminal are provided. The method includes: position information of a unit block to be removed is acquired, terrain resources in a game scene are cut into multiple terrain chunks, and each terrain chunk is cut into multiple unit blocks; vertex data of at least one adjacent unit block of the unit block to be removed is determined according to the position information; and at least one triangular patch to be rendered is reconstructed according to the vertex data. The present disclosure solves a technical problem that a terrain change mode provided in the related art is limited within a region of a single plane thereby lacking flexibility and realism.

Abstract: A method for manufacturing a mechanical part by hot stamping, and a mold and a system thereof. The method includes: heating a steel plate blank at a predetermined heating temperature; and placing the steel plate blank into a mold of the mechanical part, and stamping the steel plate blank to form wrinkles at a rounded corner of the mold and form the mechanical part in the mold: wherein, the mold of the mechanical part includes a female mold and a male mold, a stamping gap configured to accommodate the steel plate blank is provided between the female mold and the male mold, and a width of the stamping gap at the rounded corner of the mold is larger than a thickness of the wrinkles.

Abstract: A method for manufacturing a mechanical part by hot stamping, and a mold and a system thereof. The method includes: heating a steel plate blank at a predetermined heating temperature; and placing the steel plate blank into a mold of the mechanical part, and stamping the steel plate blank to form wrinkles at a rounded corner of the mold and form the mechanical part in the mold: wherein, the mold of the mechanical part includes a female mold and a male mold, a stamping gap configured to accommodate the steel plate blank is provided between the female mold and the male mold and a width of the stamping gap at the rounded corner of the mold is larger than a thickness of the wrinkles.