# Homework Help: Calculate Amplitudes

1. Dec 7, 2016

### walter3947

1. The problem statement, all variables and given/known data
In the automotive damper test machine mentioned in Task 1 the damper is mounted vertically, the top end connected to a static fixing, the bottom to a table which is moved vertically by an actuator. The moving mass is 500kg, and the design case for the rig is based upon testing the dampers with the characteristics shown in Appendix 2 throughout their active range. (Note: ignore the specifications for Task 1 here).

The actuation system is position controlled, with two test inputs as follows:

“Quasi-static” tests using 0.2Hz triangle wave motions so that the basic damper rate

(N/ms-1) can be determined from the corresponding constant velocity movements.

Dynamic tests using 2Hz sinusoidal motions to assess the dynamic performance at

typical suspension frequencies.
a) Calculate amplitudes for the two types of test input that would be required for effective te

2. Relevant equations

3. The attempt at a solution
Triangle Wave: 1/f to find time then used the velocity in graph to find max distance of both dampers. Time i used 1.25 secs as this the time it reaches its peak in the wave form. Got 0.3625 plus/minus for the type 90 damper with velocity of .29m/s

Sine wave : used the x=Asin2pift and got 0.662 plus/minus for the type 90 damper with velocity 0.29m/s

#### Attached Files:

• ###### Document1.pdf
File size:
408.7 KB
Views:
46
2. Dec 12, 2016