Vehicle shock absorber jounce testing machine
Whats/App: +86 156 1874 6768
Web: standard-groups.com
Standards
QC/T 740-2017 – Automotive Seat Assembly Fatigue Test Standard
SAE J826-2002 – Anthropomorphic Test Devices for Vehicle Seats
Features
Simulates real-world vertical vibration loads with sinusoidal motion.
Evaluates fatigue life of seat frame, cushion foam, and fabric upholstery.
Upper jounce assembly includes body form and adjustable weights for realistic load simulation.
Height and lateral adjustment ensure proper alignment and horizontal parallelism.
Overhead crane for easy installation and removal of test samples.
Servo-hydraulic lower jounce table with PC-based closed-loop control.
Programmable vibration frequency, amplitude, and acceleration with four control modes: table displacement, table acceleration, upper assembly displacement, and upper assembly acceleration.
Optional slave stations allow simultaneous testing of multiple samples.
Designed to prevent excessive inertia loads, ensuring realistic and reliable test results.
Test Principle
The tester applies controlled vibration to the seat cushion and backrest at a set frequency and amplitude for a predetermined number of cycles. After testing:
Seat frame should remain intact with no cracks.
Foam and cushion should maintain their shape without deformation.
Upholstery should show no damage.
Maximum H-point variation remains within rated range.
Typical test setup:
Seat cushion: 100.000 vibration cycles at 100 times/minute.
Backrest: 50.000 vibration cycles at 100 times/minute.
Parameters
| Parameter | Specification | Standard/Typical Value |
|---|---|---|
| Torsion Angle Amplitude | 0 – 50° | 21° |
| System Power | Mechanical vibration | — |
| Vibration Frequency | 1 – 5 Hz, adjustable | 1.5 Hz |
| Vibration Amplitude | 0 – 35 mm, adjustable | 30 mm |
| Loading Method | Weight loading | — |
| Load Weight | Cushion: 68 kgf, Backrest: 29 kgf | — |
| Vibration Cycles | 0 – 999.999 | — |
| Workstations | 1 (optional 2-seat testing) | — |
| Stop Mode | Automatic stop when cycles reached | — |
Accessories
Additional slave stations for multiple seat testing.
Extra weight sets to simulate different passenger weights.
Data acquisition system for logging vibration and displacement data.
Custom fixtures for various seat types and sizes.
Test Procedures
Secure the seat sample on the test platform.
Set vibration frequency, amplitude, and number of cycles via PC control system.
Adjust upper assembly height and lateral alignment to ensure proper horizontal parallelism.
Start the test; the system automatically stops when the target cycles are reached.
Inspect the seat frame, foam, and upholstery after testing for fatigue or damage.
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