# Seminar Outline. Normal Modes Analysis: Basics Why is it Useful How it Works. Available Resources Next Training Opportunity on October 15 19, 2012

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1 1 15 Seminar Outline : Basics Why is it Useful How it Works Principle of Orthogonality Strain Energy Mass Participation Available Resources Next Training Opportunity on October 15 19, 2012

2 u + t u t Linear Dynamics:.O.M. m c + ku= r(t) E 2 2 u t Eigenvalue problem: undamped free vibration: + ku = 0 Assuming a solution of the form: u= uo sinωt m 2 [ 2 Then: k ω m]{ u } = 0 For non trivial solutions (i.e., solutions that are more than just zeros): o [ ] k ω 2 m = 0 Giving us the well know frequency relationship: ω = k m

3 3 15 Why it is Useful: Just Basic Goodness of Normal Modes

4 4 15 Why it is Useful: Just Basic Goodness of Normal Modes

5 5 15 Why it is Useful: PSD Analysis (Frequency Domain Analysis) 9 Fatigue 9 Wind Turbine 9 Air flow over a wing 9 Acoustic Input from Jet Engine Exhaust 9 Earthquake Ground Motion 9 Wheels running over a Rough Road 9 Ocean Wave Loads on Offshore Platforms

6 6 15 Why it is Useful: Earthquake Analysis

7 7 15 Why it is Useful: Modal Frequency Sweep

8 8 15 Why it is Useful: NVH

9 9 15 Normal Modes / Eigenvalue problem: undamped free vibration k let: K vertical =1000/ m=100 ω = k m = 23, = rad sec NX Nastran reports frequencies in cycles per second. Hence, radians/sec is equal to 2.41 cycles/sec. Example Model: Normal Modes Validation Start.modfem Simple CBUSH with Mass Element Focus: Units Theory Why Only Three Modes?

10 10 15 Normal Modes / Eigenvalue problem: Principal of Orthogonality Even basic normal modes analysis can be confusing Basic beam model with a pinned support is interrogated Is it logical? Why are there double modes? Example Model: Simple Beam Principal of Orthogonality.modfem Analyze Change B.C. s Double Modes

11 11 15 Normal Modes / Eigenvalue problem: Strain Energy Density To improve the dynamic performance it is often as simple as moving the first mode to a higher frequency Normal modes is all about stiffness and mass Strain energy tells you where to add stiffness Example Model:Radioframe Networks GR 63 Core Seismic Analysis.MODFEM Show Strain Energy Discuss How Improvements Were Made CORE GR 63 Zone 4 Seismic

12 12 15 Normal Modes / Eigenvalue problem: Mass Participation and Frequency Sweep Analysis Mass Participation Tells you what is important Expand around significant modes

13 13 15 Normal Modes / Eigenvalue problem: Mass Participation and Optimization Mass Participation Tells You Heaps Optimization is often best done by intelligent inspection Don t expect miracles from computer programs Example Model: Coors Tek Paper Mill Forming Board Original Design Start.modfem

14 14 15 Normal Modes / Eigenvalue problem: TOSCA Optimization ¾ Femap Optimization for Vibration

15 15 15 Normal Modes / Eigenvalue problem: Resources NX Nastran Documentation Predictive Engineering Website Be Inquisitive we have lots of expertize to leverage

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