Current methods are expensive
Industry Efforts and Metrics
NVH involves both objective and subjective development
Part of process can be quantified with analytical tools
3 Analyze system modes including attachment and other nonlinear characteristics
Analyze Vibratory Behavior in Different Configurations
Satellite Example:
ADAMS/Vibration 振动分析模块 教程
内容
了解模块功能；
了解Vibration与Linear模块的区别；
使用Vibration模块进行虚拟振动试验及 方案设计。
Vibration Issues Facing Engineers and Designers
How comfortable is ride, whether in automobile, airplane, railcar, or off-road machinery?
Good vibration characteristics are purchase motivator and improve customer satisfaction
Need good way to measure design
Optimum NVH often conflicts with other attributes such as durability or vehicle dynamic performance
Analyze Vibratory Behavior in Different Configurations
Railcar Example:
System eigenvalues shift according to
Equivalent conicity Suspension stiffnesses Damper characteristics
Need way to balance competing requirements
Significant effort spent to understand and quantify customer NVH requirements into objective terms and define specific tests relating to customer events
Issues often discovered late in prototype development result in money and time loss
Value in designing right way
The Need
A way to study system-level vibrations the same way you can now study system-level motion problems
This shift affects railcar stability and running comfort
Include Effects of Hydraulics and Controls on System Behavior
Hydraulics Example:
Apply input vibration to control valve and see effect at cment in frequency response function plots and animations
Will excitations in one part of system interact with another part of system?
When problems occur, how can they be isolated?
Industry Efforts and Metrics
…much faster!
Solution: Extend Scope of Virtual Prototyping
Motion/ Performance
Safety
Durability/ Fatigue
Noise/ Vibration
Three Reasons to Use ADAMS/Vibration
1 Take your system to different operating points to analyze vibratory behavior (without having to create new models)
2 Include effects of hydraulics, controls, and other subsystems on vibration characteristics
System eigenvalues shift according to
Panel deployment angle Locking condition Contact condition Actual spring rates
This shift affects attitude control margin, pointing jitter magnitude, and structural loading conditions
Suppliers must “tune” their systems/components (right the first time) to prototype vehicle or else they are responsible for NVH resolution
Need way to study system