<vibration>
Basis: [ Environmental Testings Part 2: Testing;Test Fc; Vibration Sine;IEC 60068-2-6;;all;]
The test shall simulate the fatigue load of the DUT in X-, Y- and Z-axes. In general, the test is carried out in vehicle mounting position with the provided fixing elements.
Currently, different forms of description are used:
1.
 
The controlled variable is the displacement amplitude
Specification of frequency range, sweep rate and vibration amplitude (in [mm], fixed over the entire frequency range; acceleration in [g], is then a function of these parameters).
2.
 
The controlled variable is the velocity amplitude
3.
 
The controlled variable is the acceleration amplitude
Specification of frequency range, sweep rate and acceleration value. The vibration amplitude (in [mm]) is then a function of these parameters. Thus, selective vehicle-specific critical frequencies can be tested (not possible with 1).
4.
 
Mixed controlled variables
The frequency range is divided into intervals. For each interval, the controlled variable can be defined according to 1., 2. or 3.
Figure 67: Structure of vibration
Type of vibration:
Sine-shaped vibration
Test axes:
...
Sweep rate:
df / dt Sweep rate
ABS = 1 octave/min
Number of cycles:
...
Controlled variable
Complex controlled variable:
10 - 100 Hz: 2g (fmin) - 5g (fmax)
100 - 350 Hz: 5g
operating states:
2.1
evaluation criteria
input criteria:
Before the beginning of tests the DUTs should approve the intermediate tests and not show any mechanical damages.
output criteria:
The test has been successful if the DUTs show a plausible behaviour defined according to the drawing. After the test, the parameters of the intermediate test must be within the specified limits. The DUTs have to be visually inspected after testing. Mechanical damages are not admissible.
Additional specifications:
Visual inspection before testing.
The DUTs have to be mounted at their original connection points.
Continuous supervision of the DUTs during the test.
Begin of test at ambient temperature.
Repetition of the test in the other two geometrical axes.