The document discusses a request from a small startup client to analyze a voltage regulator design using FEA simulation to determine if it can withstand a 10g load in 3 axes. The simulation found the rubber bushings may tear under repeated loading in the y-axis but the aluminum spacers are below their yield strength in the x and z-axes. Vibration mode analysis identified the first few modes of vibration.

1. Prototype Ruggedization
Solidworks FEA Simulation
Quick turn around analysis
10/8/2016
Don Blanchet
3B Associates
dwb3298@verizon.net

2. Client request
(very small start-up)
 We have a voltage regulator brass
board design. Will it withstand a 10 g
load in 3 axes ?
 Don asks : “what is the nature of the
10g load?” shock? Vibration?”
 Just a 10g load………
 Hey can you do the stress
calculations or not ? We need a
fast answer.

3. Model
Stacked power regulators
With rubber isolation bushings
16 places
1.2 x 2.6 x 3.6 inches
Weight = 0.36 lbs

4. Model
FEA mesh
650,000 degrees of freedom
Held at base only

5. Customer request – 10g
static load y-axis
Probable rubber
Bushing tearing
On repeated loading
Stress = 2173 psi

6. Customer request – 10g
static load x and z axes
Bending stress
In aluminum
Spacer is well below
the yield strength
Ok for ZX loading

7. Vibration Modes from FEA
Eigenvalues

8. Vibration modes

9. Mode 1
Eigenvectors