2 results about "Acoustic design" patented technology

This invention belongs to the field of noise control and acoustic design of rail transit vehicles, and discloses a forward design method for low-noise interior of a power-centralized EMU combined with sound quality optimization. The steps are as follows: First, determine the design target value for the in-vehicle noise sound pressure level and the target value for the comprehensive annoyance index of sound quality. Second, based on the whole-vehicle noise simulation model, allocate noise limits from the perspective of sound source-transmission path combinations, and verify the rationality of the allocation results in conjunction with engineering feasibility requirements. Third, establish independent simulation models for different sound source-transmission path combinations, determine initial optimization design parameters, and input them into the whole-vehicle noise simulation model for iterative optimization to ensure that the total A-weighted sound pressure level in the passenger compartment reaches the design target. After the sound pressure level meets the target, obtain the comprehensive annoyance index of sound quality using a sound quality evaluation and prediction model. When the sound quality does not meet the target, locate the psychoacoustic parameters affecting the sound quality and the corresponding sound source-transmission path combinations, and perform secondary optimization until the sound quality meets the target.

This utility model relates to a cavity-based anti-leakage structure for a loudspeaker cable passage, comprising a loudspeaker driver, a panel, and a rear shell. The loudspeaker driver is disposed inside the panel. The panel also has a cavity, through which the connecting wire of the loudspeaker driver passes. A circular hole is provided on the rear shell corresponding to the cavity. The rear shell and panel are ultrasonically sealed after the circular hole aligns with the cavity, and the circular hole contains sealing adhesive. This utility model uses ultrasonic welding to completely eliminate the risk of air leakage at the joint surface of the partition; external adhesive injection directly seals the wire perforation, eliminating the air leakage channel; and the adhesive injection location is exposed, allowing direct visual inspection of the adhesive filling state, avoiding hidden defects; at the same time, precise external adhesive injection significantly reduces the amount of adhesive used, eliminating the internal adhesive application process and simplifying the assembly process; thus significantly improving the airtightness of the cavity, ensuring that low-frequency response and distortion control meet acoustic design requirements.