1

Effect of drop impact on column ass'y when dropped with shaft side down

Drop dolumn ass'y onto the concrete floor

Contraction of overall length

2

Effect of hammering impact on column ass'y

Use hammer to give impact shocks on the shaft of column ass'y

3

Effect of hammering impact of circumference on column ass'y

With the lower shaft fixed, the upper shaft is turned

Air pressure = 0.3 MPa

The variation of

sensor output = 0.003V

1

Check at drop onto working bench

The noise shall be measured when ass'y is dropped onto working bench (with rubber mat).

hight = 500mm

noise level = 12% up

2

Check at drop onto floor (concrete)

The noise shall be mesured when ass'y is dropped onto floor (concrete).

hight = 100mm

noise level = 13% up

3

Check at impack of yoke bearing

The noise shall be measured when yoke end is impacted agaist iron block.

hight = 100mm

noise level = 11% up

4

Check at drop onto working bench

The noise shall be measured when ass'y is dropped onto floor (concrete)

hight = 1000mm

noise level = 27% up

5

Check at drop onto floor (concrete)

The noise shall be measured when ass'y is dropped onto floor (concrete)

hight = 25mm

noise level = 14% up

6

Check vibration limit

Sweep speed :

5 to 200Hz/12h (at each acceleration)

Vibation derection :

on-vehicle configuration, X(transversal), Y(logitudinal), Z(vertical)

No noise at 44m/s² (acceration)