Correlation of Sinusoidal Sweep Test to Field Random Vibrations

The vibration load subjected to many products is the combination of several random processes corresponding to different application conditions, such as the various field road load inputs for automotive components. Sometimes the input loads are the combination of random and sinusoidal vibration. Due to the convenience of test setup and monitoring, the sinusoidal vibration sweep tests are often used for product durability validation by many automotive and consumer product manufacturers. It is therefore important to correctly correlate the sweep test to the field vibration. This work presents a tool for transferring…


1 Notation
2 Introduction
2.1 Background
2.2 Aim of the work
2.3 Description of the work
3 Vibration Tests
3.1 Introduction
3.2 Vibration testing
3.2.1 Categories of Tests
3.2.2 Bounce Test
3.2.3 Sinusoidal Sweep Test
3.2.4 Random Noise Test
3.2.5 Shock Test
4 Fatigue Damage Evaluation
4.1 S-N Curve
4.2 Fatigue life
4.3 Palmgren-Miner Rule
4.3.1 Estimating Cumulative Damage in the Field:
4.3.2 Example
4.3.3 Reliability Model for Fatigue Test
4.4 Fatigue Damage Spectrum
4.4.1 Fatigue damage by a swept sine vibration on a SDOF
4.4.2 Logarithmic Sweep
4.4.3 Estimating Cumulative Damage in a Lab Test
4.4.4 Fatigue Damage Equivalence
4.4.5 Method for calculation of Fatigue Damage spectrum and Correlation with Field data
5 Standard Tests and Methods
5.1 MIL-STD-810F
5.1.1 Method 514-Vibration
5.1.2 Method 516-Shock
5.2 IEC 60721
5.2.1 IEC 60721-4-2
5.3 IEC 60068-2-6 Test-Vibration (sinusoidal)
5.4 IEC 60068-2-6 Test-Shock
6 Environmental Conditions
6.1 Theory
6.1.1 Vibration Sources
6.1.2 Vibration Types
6.1.3 Vibration Forms
6.1.4 Determining a Good Test
6.1.5 Test Parameters
7 Example
8 Calculations and Curves
8.1 Sine Sweep
8.2 Field Test Data
8.2.1 Scatter Plot PSD
9 Results and conclusions
9.1 Correlation of Sinusoidal Sweep Test to Field Test Data
9.2 Sine Sweep Equivalence
9.2.1 Reduction of test time
10 References

Author: Praveen Gurindapalli, Jaya Hari Lade

Source: Blekinge Institute of Technology

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