摘要
针对电动汽车在行驶过程中,车内声压级较低而引起的驾驶体验感降低和驾驶疲劳问题,文章提出了一种车内主动声音系统。首先,根据发动机声音特定的谐波结构和主阶次准周期特性,对原始声音信号进行分解,并搭建声音样本数据库。随后,根据油门踏板开度信号对数据库中的声音样本实时读取,同时利用时域同步叠加方法对读取的声音样本进行合成。最后,在Matlab仿真平台对本文的时域同步叠加方法进行仿真,并与传统直接叠加方法进行对比。仿真结果表明,虽然两种方法在匀减速和匀速的阶次分析结果相差不大,但与时域同步叠加方法相比,直接叠加方法合成的声音幅值存在一定程度不连续现象;在匀加速工况下,时域同步叠加方法合成的声音幅值和阶次成分精度方面都要优于直接叠加方法。
Aiming at the problem of reduced driving experience and driving fatigue caused by the low sound pressure level in the electric vehicle during driving,this paper proposes an active sound system in the vehicle.First,according to the specific harmonic structure of the engine sound and the quasi-periodic characteristics of the main order,the original sound signal is decomposed and a sound sample database is built.Second,the sound samples in the database are read in real time according to the accelerator pedal opening signal,and the read sound samples are synthesized using the time-domain synchronous superposition method.Finally,the Matlab simulation platform simulates the time-domain synchronous stacking method in this paper and compares it with the traditional direct stacking method.The simulation results show that although the results of the order analysis of the uniform deceleration and uniform speed are not much different between the two methods,compared with the time-domain synchronous superposition method,the amplitude of the sound synthesized by the direct superposition method has a certain degree of discontinuity;Under working conditions,the accuracy of the sound amplitude and order components synthesized by the time-domain synchronous stacking method are superior to the direct stacking method.
作者
张贤
史晨路
郑明军
苏新
Zhang Xian;Shi Chenlu;Zheng Mingjun;Su Xin(School of Mechanical Engineering,Shijiazhuang Tiedao University,Hebei Shijiazhuang 050043;China Auto Research(Tianjin)Automotive Engineering Research Institute Co.Ltd.,Tianjin 300300)
出处
《汽车实用技术》
2020年第15期78-81,共4页
Automobile Applied Technology
关键词
电动汽车
发动机声音
声音合成
主动声音
时域同步叠加
Electric vehicle
Engine sound
Sound synthesis
Active sound
Time domain synchronization overlap-and-add
