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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