第六章汽车平顺性解析课件.ppt

1、5/31/202215/31/202225/31/202235/31/202245/31/202255/31/20226输入汽车系统振动输出指标评价5/31/202275/31/202285/31/202295/31/2022105/31/2022115/31/2022125/31/2022135/31/2022145/31/2022155/31/2022165/31/2022175/31/202218TdttaTa02)(1TwwdttaTa02)(15/31/202219TwwdttaTa02)(1)()(fGtaa805 . 0 f21805 . 02)()(dffGfwaaw5/31/

2、202220222)4 . 1 ()4 . 1 (zwywxwwaaaa5/31/20222112222wwww1 41 4/xyza. a. aa0waw/20lgaaL62010 m/sa5/31/202222记录的模拟信号记录的模拟信号 计算自功率谱计算自功率谱KKAAtia 频率加权频率加权WKWKAA均方根值计算均方根值计算( )W f a tvas( )KKAAf5/31/202223 按照按照ISO-2631标准进行频率加权的标准进行频率加权的“人体振动测量仪人体振动测量仪”在平顺性评价试验中得到采用。这种仪器通常用模拟在平顺性评价试验中得到采用。这种仪器通常用模拟/数数字混合法

3、计算加权加速度均方根值。字混合法计算加权加速度均方根值。记录的模拟信号记录的模拟信号模拟模拟-数字转换数字转换i=1,2,N/2tia模拟模拟 频率频率加权滤波加权滤波 wat均方根值计算均方根值计算va a t Wf5/31/2022245/31/202225)(IqqIO基准平面5/31/2022265/31/2022272q)(nGq5/31/202228wqqnnnGnG00)()(5/31/202229路面不平度 8 级分类 Gq(no)10-6m2m-1 no0.1m-1 q10-3m 0.011m-1n2.83m-1 路面等级 下限 几何平均值 上限 下限 几何平均值 上限 A

4、B C D E F G H 8 32 128 512 2048 8192 32768 131072 16 64 256 1024 4096 16384 65536 262144 32 128 512 2048 8192 32768 131072 524288 2.69 5.38 10.77 21.53 43.06 86.13 1?2.26 344.52 3.81 7.61 15.23 30.45 60.90 121.80 243.61 487.22 5.38 10.77 21.53 43.06 86.12 172.26 344.52 689.04 2)()(00wnnnGnGWqq，5/31/

5、202230)(nGq功功率率谱谱密密度度n空空间间频频率率ABCWqqnnnGnG00)()(5/31/2022315/31/202232WqqnnnGnG00)()()()2()(2nGnnGqq)()2()(4nGnnGqq 5/31/202233WqqnnnGnG00)()()()2()(020nGnnGqq5/31/2022345/31/202235)(1)(nGufGqq5/31/2022362 nq )(nGqnf21nfnf2u=1/2u=1u=212112Gq(f)n5/31/2022372200)()(funnGfGqqunnGfGqq2002)(4)(22004 )(16

6、)(funnGfGqq 5/31/2022385/31/2022395/31/202240012345678910-0.015-0.01-0.00500.0050.010.0150.02time (sec)路面对前轮的激励（路面对前轮的激励（v=36km/h）q (m)5/31/202241012345678910-0.02-0.015-0.01-0.00500.0050.010.0150.020.025time (sec)路面对后轮的激励（路面对后轮的激励（v=72km/h）q (m)5/31/20224201234-0.015-0.01-0.00500.0050.010.015时间/s路面

7、激励/mz1z2z3z45/31/2022430200400600800100002004006008001000-20020X /mmZ /mmY /mm5/31/2022445/31/2022455/31/2022462222mmmmcrf022bmamrf222222bmammIrfyy5/31/202247aLmmyf222bLmmyr222)1 (222abmmycaby25/31/20224812aby0)1 (222abmmyc5/31/2022495/31/2022505/31/2022510)()(2qzkqzczm kqqckzzczm 2qmkqmczmkzmcz2222

8、 5/31/202252kqqckzzczm 2qmkqmczmkzmcz2222 0220zznz 5/31/20225305101520-10-50510tx0220zznz )sin()(220tnAetznt5/31/202254)()()(QZH5/31/202255kqqckzzczm 2jcmkkjcHqz22)()(/200mkkmc22jjHqz2121)(25/31/20225622222)1 (21)(）（）（qzH024681002468105/31/202257z dfdF5/31/202258)()()(2fGfHfGqqzzdffGfHdffGqqzzz)()()

9、(20025/31/202259)()()(2qqzzGHG jjHqz2121)(25/31/20226022222)2()1 ()2(1)(qzH 2222)2()1 ()2(1)(qzH 2222)2()1 ()2(1)(qzH 5/31/202261)()()(2qqzzGHG jjHqz2121)(25/31/2022622222)2()1 ()2(1)(qzH 0123450510152025305/31/202263zmFd 2gzGFd 5/31/2022642222/)2()1 ()2(1)(gHqGFd0123450510152025305/31/202265qzfd1qz

10、qfd2224)2()1 ()(qfdH5/31/202266024681002468102224)2()1 ()(qfdH5/31/202267024681000.050.10.150.20.250.30.352224)2()1 (1)(qfdH5/31/2022685/31/2022695/31/2022705/31/2022710)()(0)()()(1212221212111zzkzzczmqzkzzkzzczmt 5/31/2022720)()(0)()(1212221212111zzkzzczmzkzzkzzczmt 00)(22221111kzzczmzkkzczmt 5/31/

11、20227320mk00)(22221111kzzczmzkkzczmt 1mkktt5/31/2022740)()(0)()(1212221212111zzkzzczmzkzzkzzczmt 12220220222, 1)(41)(21mmkkttt5/31/2022755/31/20227677. 6)1(1)1(21AA5/31/2022775/31/2022780243. 0)2(1)2(22AA5/31/2022795/31/2022805/31/2022810)()()()(1212221212111zzkzzczmqkzkzzkzzczmtt cjmkcjkZZHzz2212)(

12、)()(12)()()(11QZHqz)()()(22QZHqz5/31/202282qzH 2)(qGFdH/)(qfdH)()(1qzKFtd5/31/20228310-110010110210-1100101102qzH 2)(5/31/20228410-110010110210-1100101qGFdH/)(5/31/202285qfdH)(10-110010110210-310-210-11005/31/20228610-110010110210-1100101102qzH 2)(5/31/20228710-110010110210-1100101qGFdH)(5/31/202288

13、10-110010110210-310-210-1100qfdH)(5/31/20228910-110010110210-1100101102qzH 2)(5/31/20229010-110010110210-210-1100101qGFdH)(5/31/20229110-110010110210-310-210-1100qfdH)(5/31/20229210-110010110210-1100101102qzH 2)(5/31/20229310-110010110210-310-210-1100101qGFdH)(5/31/20229410-110010110210-310-210-1100

14、qfdH)(5/31/2022955/31/2022965/31/2022975/31/2022985/31/202299qzzpqpHHqFzFzFpFqFzFzFpFqFpFH 222222)()()()()()()()()()()()()(5/31/20221005/31/20221012222)2()1 ()2(1)(qzH 5/31/20221022222)2()1 ()2(1)(2ssssszpHsssssmk5/31/202210310-110010110210-1100101102qzH 2)(5/31/20221042)(zpH 10-110010110210-310-210

15、-11001015/31/2022105qpH )(10-110010110210-310-210-11001011025/31/2022106s2 ff Hz4fHz32Hz4s/f5/31/20221075/31/2022108)(21210HzGgkmkf5/31/20221095/31/20221105/31/20221115/31/20221125/31/20221135/31/20221145/31/20221155/31/20221165/31/20221175/31/20221185/31/20221195/31/20221205/31/20221215/31/20221225

16、/31/2022123主动与半主动悬架 被动悬架被动悬架：弹簧刚度：弹簧刚度 K 和减振器阻尼系数和减振器阻尼系数 C 在设计时在设计时一旦选定后，使用过程中参数不改变的悬架一旦选定后，使用过程中参数不改变的悬架 。 被动悬架的被动悬架的缺点缺点是：当载荷、车速、路况等行驶状态变是：当载荷、车速、路况等行驶状态变化时，悬架不能满足各种行驶状态下对悬架性能的较高化时，悬架不能满足各种行驶状态下对悬架性能的较高要求。要求。5/31/2022124 可控悬架可控悬架：将传感器测量：将传感器测量的系统运动状态信号输入电的系统运动状态信号输入电控单元，电控单元经过分析、控单元，电控单元经过分析、判断后给

17、力发生器发出指令，判断后给力发生器发出指令，产生主动控制力，满足不同产生主动控制力，满足不同工况对悬架系统特性参数变工况对悬架系统特性参数变化的要求。化的要求。5/31/2022125可控悬架的分类21zz 21zz 5/31/2022126 “空钩空钩”控制时，根据悬架的相对速度控制时，根据悬架的相对速度 和车身的绝对加速度和车身的绝对加速度 的符号来切换阻尼设置。的符号来切换阻尼设置。21zz z 5/31/20221270122 zzz12onzzCF 0122 zzz0F当当“on”状态状态阻尼力阻尼力当当“off”状态状态阻尼力阻尼力Con on状态可切换阻尼减振状态可切换阻尼减振器的阻尼系数。器的阻尼系数。5/31/20221280122 zzz0122 zzz0F当当阻尼力阻尼力当当阻尼力阻尼力2skyzCF12eq2skyzzCzC122skyeq/zzzCC 空钩控制减振器阻尼系数。空钩控制减振器阻尼系数。 连续可调阻尼器的等效阻尼系数。连续可调阻尼器的等效阻尼系数。skyCeqC5/31/2022129主动悬架5/31/20221305/31/20221315/31/20221325/31/20221335/31/20221345/31/2022135