The Single Station Jounce Tester is intended to evaluate either seat components or a complete seating system.  The evaluation criteria are usually visual, but sometimes can be electrical (connections to seat heaters and other components), and sometimes audio.  These include wear patterns, or general durability of the seat covering material, the foam, and the support structure underneath.

The upper jounce loading mechanism includes an appropriate body form and loose weights that can be added as necessary.  This upper assembly is guided through eight ball bearings and four lightweight aluminum parallel arms, back to the main support frame.

The entire set-up is height adjustable to maintain horizontal parallelism of the arms using an attached bubble level.  The entire set-up is laterally adjustable too so that it can be centered on the test sample.  An overhead crane is included to suspend the loading mechanism while test samples are installed or removed.

It is important to notice that this type of mechanical design loads the test sample with the correct amount of body weight without inducing excessive inertia loads like some other test machines do.  These high inertia loads on some competitive equipment increase the severity of the test and may cause some borderline samples to fail when they really should not.

The lower jounce table is servo-hydraulic driven and operated with a P.C. based closed loop control system.  The vertical movement is sinusoidal and programmable for both frequency and acceleration.  Four control modes are available: Table displacement, table acceleration, upper assembly displacement or upper assembly acceleration.

The Single Station Jounce Tester comes with one station, but additional slave stations (no data feedback) can be added (see Jounce Tester Stations).  This allows you to test multiple samples of the same seat at the same time.

Applicable standards:

QC/T 740

Test principle:

During the test, the test frequency, test amplitude, and test cycle number can be set, and the machine will automatically stop when the test number is reached. The test verifies the fatigue life of the seat frame, foam, and fabric. At a frequency of 100 times per minute, the seat cushion is subjected to 100,000 vibration tests, and the backrest is subjected to 50,000 vibration tests. After the test, the samples should have no abnormalities, no cracks in the seat frame, no deformation of the foam, and no damage to the fabric and cushion, and the maximum variation of the H point should be within the rated range.

Experimental parameters:

1. Torsion angle amplitude 0~50 degrees, standard is 21 degrees

2. System power: mechanical vibration

3. Vibration frequency: 1~5hz adjustable, standard is 1.5hz

4. Vibration amplitude: 0-35mm adjustable, standard is 30mm

5. Loading method: weight loading

6. Load weight: 68kgf (front seat cushion) and 29kgf (front backrest)

7. Vibration times: 0-999,999 times can be set

8. Workstation: 2 seats can be tested at the same time

9. Stop mode: automatic stop when the test times are reached