Electric Steering Shaft Vibration and Noise Detection
1. Project Background and Requirements
With the advancement of automotive electrification, Electric Power Steering (EPS) systems have become standard configuration. The NVH performance of the steering shaft directly impacts driving comfort and perceived quality. Traditional detection methods face significant challenges:
Subjective Judgment Issues: Manual auditory detection lacks objectivity and quantifiable standards
Health Hazards: Long-term exposure to industrial noise environments can cause hearing damage to inspectors
Low Efficiency: Individual testing is time-consuming, unable to meet the rhythm of high-speed production lines
Inconsistent Standards: Different inspectors may have varying judgment criteria, leading to inconsistent quality control
2. Testing Solution and System Configuration
This solution employs non-contact laser vibration measurement technology to achieve fast, accurate detection of steering shaft vibration and noise characteristics.
System Composition:
Detection System:
Dynatronic VibroMicro VM-S-100 Micro Laser Doppler Vibrometer
Industrial-grade mounting bracket and protective housing
Excitation System:
Standardized test platform
Programmable motor driver
Signal Analysis System:
Real-time spectrum analysis software
Abnormal noise characteristic database
Automatic judgment algorithm
3. Test Procedure
Automatic Positioning:
The steering shaft is automatically transferred to the test station via conveyor
Laser automatically aligns with predetermined measurement points
Standardized Testing:
Drive the steering shaft motor to operate according to preset programs
Simulate various working conditions: startup, constant speed, acceleration/deceleration
Data Acquisition:
Laser vibrometer collects vibration velocity signals
Simultaneously acquire near-field acoustic signals (optional)
Automatic Analysis:
Real-time analysis of vibration spectrum characteristics
Compare with standard sample database
Automatically identify abnormal noise features
4. VibroMicro VM-S-100 Core Advantages
4.1 Non-Contact Measurement
Completely non-contact, avoiding any impact on rotating components
No additional load, accurately reflecting the true vibration state
Suitable for various surface materials and complex shapes
4.2 High Sensitivity
Nanometer-level displacement resolution
Capable of detecting weak vibration signals
Wide frequency range (DC-1MHz), covering the entire audible frequency range
4.3 Production Line Suitability
Compact size, easy for production line integration
Fixed installation, ensuring measurement consistency
High measurement speed, meeting production line cycle time requirements
4.4 Comprehensive Data
Provides complete vibration frequency and amplitude information
Can correlate vibration characteristics with acoustic signals
Establish quantifiable quality standards
5. Test Results and Application Value
5.1 Detection Content
Motor Vibration: Detect unbalanced vibration and electromagnetic noise
Gear Meshing: Identify gear wear and assembly defects
Bearing Status: Monitor bearing damage and lubrication issues
Structural Resonance: Discover structural design defects
5.2 Typical Abnormal Characteristics
Clear Frequency Peaks: Corresponding to specific fault frequencies
Broadband Noise: Typically caused by impact or friction
Frequency Modulation Phenomena: Often related to rotating component defects
Resonance Peaks: Indicating structural natural frequency issues
5.3 Application Benefits
Quality Improvement:
100% full inspection capability
Early detection of potential defects
Significant reduction in customer returns
Efficiency Enhancement:
Testing time reduced to within 10 seconds
No need for professional inspectors
Achieve true automated testing
Standardization Advancement:
Establish quantifiable quality standards
Data traceability for the entire process
Support continuous process improvement
6. Implementation Effectiveness
Performance Indicators:
Detection accuracy: >99%
False positive rate: <1%
Single testing time: <8 seconds
Continuous operation: >20 hours
Economic Benefits:
Reduce quality loss costs by approximately 60%
Save labor costs by about 80%
Decrease after-sales maintenance costs by approximately 40%
Conclusion:
The Dynatronic VibroMicro VM-S-100-based electric steering shaft abnormal noise detection system successfully replaces traditional manual auditory inspection methods. Through non-contact laser vibration measurement technology, it achieves quantitative, standardized, and automated quality control, significantly enhancing production efficiency and product quality while effectively protecting workers' occupational health. This solution provides an ideal quality assurance method for high-volume production in the automotive industry and can be extended to similar rotating component NVH testing scenarios.
