Project Title: prototype of the memory of the mechanical rover AREE.

Project Period: from the 18^th till 20^th October 2019.

Project Team: -Bekhoucha Imed edine Massinisa

-Yahia Aymen

Ould-Rouis Amine

General Summary:

Venus!¹ A planet with a lot of challenges that are for us humans nearly impossible to achieve .High temperature , 92 times the pressure of the Earth , course let’s not forget the presence of a lot of corrosive gazes like Sulfur dioxide. Human has tried many times to reach Venus by sending many probes and rovers but we never could receive a lot of data , most of traditional electronic circuits doesn’t work there because of the hostile environment. NASA had the idea to send AREE² (Automation Rover Extreme Environment) that is completely mechanical, to get data in other ways and send them in other ways. The problem is that the rover will send the data to the probe in the low-orbit of Venus very slowly because they will be connected to each other for 0.7 seconds only! So NASA concluded that we have to make a memory inside this rover, and THIS IS OUR CHALLENGE!

Our Approach:

-1-transmission:

Our team has decided to look for a suitable transmission method before looking on how to store the data. The way to send data safely and also with a relatively low cost material is called the Radar Targeting . The probe in the orbit of venus will send a sonor signal that will be audible by the rover because the background sounds in venus is between 10 to 20 db and the probe can theorically by using matlab nasa scientist have found that it can send a signal that can reach 59 db , and the rover will be able to distinguish between the background sounds of venus ³and the sound waves from the probe using the stetoscope method, and that will activate the memory that has been filled with data, and here is a scheme that will explain more about it :

After that the rover will detec&t the sounds from the probe and activating the memory,and the memory will use the radar target system to send data. The radar target of the rover is a specifically shaped object designed to reflect a radar signal brightly , and essentially operates the opposite of stealth technology. While a radar target by itself would only create a bright spot on the surface of Venus, if a shutter was added over the target to modulate the signal, data can now be transmitted to a radar orbiter. And we will see now see how does the memory works.

2-the memory:

The challenge consists in making a mechanical memory that can contain at least 1MB. We decided that the memory will have a shape of a disk and that have holes that works like doors (on/off) and we will have special mechanical circuits that will activate those doors ,the data that has been collected by the rover will be translated to binary code , you will ask us maybe , how can we use the binary system without electricity ? well it is pretty simple , the holes that we can see on the disk means that the door is open (on = 1 )and if we can’t see anything it means the door is closed ( off =0). The disk will be having a capacity of 8388608 door and this is because

1 Mega Bytes = 8 388 608 octets, each octets = one information

we will have a needle that will do passes on the disc to recognize if there is a hole or not which is equivalent to 1 or 0 the needle will have a force applied to it by a system of drum and it will go back to its initial place with the help of a spring attached to it .
then that energy gained from our reading needle will be transferred to a mechanical energy using gears to move our shutter and by doing that we will send different light signal on the surface of venus that can be traced back by our probe and from there collect all the data stored in the disk and send it back to earth.

3-materials⁴:

Due to extreme environment not many material can be used in the making of our memory so we steeled down on the following we used for the measuring needle and gears titanium and for the frame we used gallium nitride and in last the memory disk that is made out of aluminium

Table of materials and there temperature limit

Our problems :

We faced multiple problems throughout this challenge and that because of multiple reasons:

• The lack of data about the automaton rover extreme environment
• The lack of data about Venus
• The lack of material to make experiments
• Lack of time

With more information’s and data and more time we could have made a full finished project and a better planed design

Links used :

1 – https://solarysystem.nasa-gov/planets/venus

2 – https://www.nasa.gov/feature/automaton-rover-for-e... -environments-aree/https://www.nasa.gov/sites/default/files/atoms/fil...

3 – https://data.nasa.gov/dataset/Venus-Surface-Sampli...

4- https://data.nasa.gov/dataset/Manufacturing-For-De...

• https://data.nasa.gov/datset/High-Pressure-Atmoshp...
• https://www.google.com
• https://www.wikipedia.org