LMS模态试验与分析
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LMS 模态分析: 完整解决方案
LMS Modal Analysis Techniques
内容提要
2
模态试验分析工具
1模态试验目的3
模态仿真分析工具
2.1分析手段
2.2试验手段2.3
数采前端3.1结构修改及预测
3.2相关性分析3.3
预试验4
综述
X
=
Source
Receiver
•Engine •Rotor •Road
•Gearbox & transmission •Turbo machinery •Wheel & tire •Accessories
•Environmental sources •...
Transfer through the structure
•Noise at driver’s & Passenger ears •Steering wheel shake
•
Rear view mirror vibration
•
Cabin comfort •Structural integrity •Seat vibration •Cockpit NVH •
...
System Transfer
System Transfer M o d a l A
n a l y s i s
模态分析
9结构固有属性分析
9表现为
9共振频率
9阻尼比
9振型
目的:
9验证产品振动与噪声问题
9提高产品耐久性
9提高数字模型准确性
内容提要
2
模态试验分析工具
1模态试验目的3
模态仿真分析工具
2.1分析手段
2.2试验手段2.3
数采前端3.1结构修改及预测
3.2相关性分析3.3
预试验4
综述
模态试验工具:数采前端
Mobile:移动
305
306 slave unit
AC / DC / Battery
Standard LAN
SCSI optional
Lab / Test Benches:台架310
311 slave unit
AC or AC / DC /Battery
Standard SCSI
Optional LAN
316
317 slave unit
AC
SCSI or Wide SCSI
M01 & M05
Autonomy -low
power consumption:
Up to 4 hours on
internal batteries
Broad operating
conditions:
-10 C > +55 C
Vibration / shock:
MIL-STD 810F
…
Potable:便携
Modular and scalable for any NVH application
LMS SCADAS Mobile
Compact -high channel count low power –wide operating conditions
LMS SCADAS III Extended throughput performance & signal conditioning
Any signal condition you would want...
Tacho Voltage
ICP Microphone
Charge
TEDS
Bridge
Digital
AES/EBU
Torsional
Analog OUT
DAC
Modular and scalable for any NVH application
4 4 4 4 4
192
120
60
40
8
Number of channels per frame
SC316
SC310
SC305
SCM05
SCM01
内容提要
2
模态试验分析工具
1模态试验目的3
模态仿真分析工具
2.1分析手段
2.2试验手段2.3
数采前端3.1结构修改及预测
3.2相关性分析3.3
预试验4
综述
模态试验方法:锤激法
Modal impact guides the operator through the test setup
and sets up the test for him System suggested parameters
Trigger settings
Window parameters
Acquisition bandwidth
Productive impact testing
Audio feedback
Auto-reject overloads
Auto-reject double impacts
Auto-accept good averages
Auto-increment hammer ID