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某SUV低频敲鼓声分析

  • 2026-04-17 23:30:09
某SUV低频敲鼓声分析
某款SUV以60km/h 的速度在粗糙沥青路面行驶时，车内有明显的敲鼓声。经过声音回放和滤波分析后，确认敲鼓声的频率在 26Hz，如图1所示。低频敲鼓声是典型的结构路噪问题，为了寻找传递路径，采用了多重相干分析方法。
图1  某款车行驶在粗糙路面时的车内声压级，26Hz 频段有明显的敲鼓声
第一，分析前后悬架的贡献。图2给出了车内声音分别与前悬架振动和后悬架振动之间的多重相干系数。在26Hz，前悬架的相干系数为0.3 ；而后悬架的相干系数达到 0.81，因此，可以确定这个敲鼓声来自后悬架的传递。
图2  车内声音与前悬架和后悬架振动之间的相干系数
第二，确定后悬架传递的通道。这辆车后悬架与车身的连接点有前摆臂前安装点、前减振器安装点、前摆臂后安装点、后副车架前安装点、后弹簧安装点、后减振器安装点、后副车架后安装点。分析车内噪声与这些连接点振动之间的相干函数，如图3所示，上述安装点的相干系数分别为 0.72、0.84、0.79、0.64、0.61、0.79 和 0.94。从这组数据可以看出，26Hz 的敲鼓声最主要的传递路径是从后悬架的后副车架安装点传递到车身。
第三，确认辐射声音的车身板。低频敲鼓声最终是由车身板辐射的，因此可以通过分析车内噪声与车身板之间的多重相干来识别。图4给出了车内噪声与车身板（右后轮毂包、顶棚后横梁、左后轮毂包、前风窗流水槽、背门内侧板、背门外侧板、背门玻璃、顶棚前横梁）振动之间的相干系数，分别为 0.80、0.93、0.83、0.79、0.99、0.99、0.99 和 0.39，因此，可以确认背门是26Hz敲鼓声的主要来源。
图3  车内噪声与后悬架和车身连接点振动之间的相干系数
图4  车内噪声与车身板振动之间的相干系数
通过以上分析，路面振动经过轮胎传递到后悬架，再通过后副车架后连接点到车身，激励其背门振动而辐射出敲鼓声。图5给出了传递路径，因此，修改这条路径上的任何一个结构或者组合结构，都可以降低敲鼓声。
图5  某车车内26Hz 敲鼓声的传递路径
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来源：庞剑.汽车路噪控制理论与应用[M].机械工业出版社,2024.
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  1. CONNECT:[ UseTime:0.000393s ] mysql:host=127.0.0.1;port=3306;dbname=e_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000694s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000270s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000351s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000697s ]
  6. SELECT * FROM `set` [ RunTime:0.001855s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000792s ]
  8. SELECT * FROM `article` WHERE `id` = 490929 LIMIT 1 [ RunTime:0.000456s ]
  9. UPDATE `article` SET `lasttime` = 1776948687 WHERE `id` = 490929 [ RunTime:0.000978s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000291s ]
  11. SELECT * FROM `article` WHERE `id` < 490929 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000705s ]
  12. SELECT * FROM `article` WHERE `id` > 490929 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001009s ]
  13. SELECT * FROM `article` WHERE `id` < 490929 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002551s ]
  14. SELECT * FROM `article` WHERE `id` < 490929 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001621s ]
  15. SELECT * FROM `article` WHERE `id` < 490929 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001171s ]
0.084255s