E-Code1-DOF forced vibration — a TI-84 Plus CE program
VIB1 is a TI-BASIC program for the TI-84 Plus CE. Natural frequency, damping ratio, logarithmic decrement, magnification factor, steady-state amplitude, phase lag and force transmissibility.
What it asks for and what it shows
It asks for 5 values at its prompts. In the example below it shows WN, ZETA, LOG DEC, MAG, AMPL M, PHASE, TRANSM.
Example run
One of its oracle test cases: “below resonance”. The inputs are typed in order, and the results are the values the case expects on the screen.
| Step | Value |
|---|---|
| You enter | |
| Input 1 | 10 |
| Input 2 | 4000 |
| Input 3 | 40 |
| Input 4 | 100 |
| Input 5 | 30 |
| The screen shows | |
WN= | 20 |
ZETA= | 0.1 |
LOG DEC= | 0.6314838834 |
MAG= | 0.7779098416 |
AMPL M= | 0.01944774604 |
PHASE= | 166.5042667 |
TRANSM= | 0.8121617182 |
How it's checked
6 test cases, each checked against an independent method. Replayed key by key on a virtual TI-84 Plus CE, they make 48 checks.
How E-Code checks every program
Run it or put it on your calculator
- Open the library in the TI-84 Plus CE calculator and pick “1-DOF forced vibration” (VIB1).
- Put it on your own calculator with a computer and a USB cable, or type it in by hand.
Related programs
- 2-DOF vibration: modes
- RC, RL and RLC transient response
- Bode point and stability margins
- Second-order step response metrics
- AC circuit: series or parallel RLC phasors
All TI-84 Plus CE engineering programs · All TI-84 Plus CE programs