The Impact Attenuator design clearly reaches the minimum conditions that SAE requires for the 2010 FSAE rules section B3.20:

Figure N 1. 2010 Impact Attenuator model

The Impact Attenuator must be:

a. Installed forward of the Front Bulkhead.b. At least 200 mm (7.8 in) long, with its length oriented along the fore/aft axis of the frame.c. At least 100 mm (3.9 in) high and 200 mm (7.8 in) wide for a minimum distance of 200 mm (7.8 in) forward of the Front Bulkhead.d. Such that it cannot penetrate the Front Bulkhead in the event of an impact.e. Attached securely and directly to the Front Bulkhead and not by being part of nonstructuralbodywork

Impact Attenuator Data Requirement According to section 3.21.1 The team must submit test data to show that their Impact Attenuator, when mounted on the front of a vehicle with a total mass of 300 kgs (661 lbs) and run into a solid, non-yielding impact barrier with a velocity of impact of 7.0 metres/second (23.0 ft/sec), would give an average deceleration of the vehicle not to exceed 20 gs, with a peak deceleration less than or equal to 40 gs. In order to achieve the mentioned scenario a free throw impact test was performed by our team. These are the equations ruling our design scenario:

EQUATIONS USED:

1. Vf= Vo + gt

2. Vf2= Vo2 +2gh

3.

4.

ESTIMATED COLLISION TIME: Working with the equation (1)

Vf= Vo +gt

REQUIRED IMPACT HEIGHT:

Working with the equating (3)

h= Vo t +

2010 Atenuador de Impacto

CAR NUMBER 046

SCHEMATIC OF THE TEST METHOD:the test method used was free fall.

Figure N 2. Schematic of the test method

This is the full structure created to fulfill the free throw crash test:

Figure N 3. Impact StructureESTIMATED DECELERATION:

Working with the equation (1)

Where:a: decelerationXn: distance between a point of the piece and the floor at a moment.Xn+1: distance between a point of the piece and the floor at a later moment to n.Xn-1: distance between a point on the workpiece and the ground at a moment prior to n. Time differential between moments. Images of the test, taken with a t equal to 0.02331 based on the acquisition of data necessary to calculate the average.

Figure N 4. Images of the testData: seg m m mg =9,81 m/Substituting:

G= = 14,6574 G

This is the 2010 IA before performing the crash test

Figure N 5. Impact Attenuator before crash test.

Figure N 6. internal structure of the AI before the crash tests.

Figure N 7. Impact Attenuator Side View after crash test

We can see how the design attenuator absorbs the energy of the impact; generating an average deceleration of 14,6574 G below top 20 gs of the section 3.21 rules.The team elaborates a video with all the physical experiences; this video contains the details of the physical simulation of the four pre design models of the FSAE-UDO team.

We want the judges for review this video, so if you can sent us an address to ship this video in order to complete the experimental data.

Please if you decided to review this video sent the address to: fsaeudo@gmail.com