Difference between revisions of "Qbkit edu"

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* Closure panels / exterior elements: They mechanically interface with the horizontal elements with M2.5 fasteners.
 
* Closure panels / exterior elements: They mechanically interface with the horizontal elements with M2.5 fasteners.
  
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== MSD Tutorial example: Deployment from ISS ==
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= MSD Tutorial example: Deployment from ISS =
  
 
This section presents a tutorial example to familiarise the customer with the features that are contained within MSD.
 
This section presents a tutorial example to familiarise the customer with the features that are contained within MSD.

Revision as of 13:03, 5 May 2017


qbkit hardware

qbkit edu emulates the mechanical and electrical interfaces of a nanosatellite mission: power and data interfaces, flexible mechanical interfaces and an Open Source computing platform running Linux OS.

The main components of the qbkit edu are:

  • qbkit edu electronics
    • Beaglebone Open Source computer.
    • qbkit power and data interfaces shield for Beaglebone.
  • 3d printed structure

qbkit edu electronics

Power buses

Qbkit edu electronics contain:

  • Converter 1 and converter 2 step down converters with manually configurable voltage and up to 3A current rating. Factory configuration is the following one:
    • Converter 1: 3.3V
    • Converter 2: 5V
  • Converter 3: step up converter with manually configurable voltage. Range: from Vin (12V with adaptor supplied) to 28V. Current rating is limited by the qbkit edu power supply (12V at 2A max).

Each power bus contains a current sensor.

qbkit edu electronics contains another step down converter currently not being used.

Adjustment of power buses voltage

Voltage in each of the 3 power buses can be adjusted

Data buses

qbkit edu electronics contain the following data buses:

  • CAN
  • I2C
  • SPI
  • UART
  • 2x GPIO

qbkit edu PL interface pinout

The following table shows the pin out of the payload connector on the qbkit edu electronics.

Header Pin number Pin name Comment
Payload_power_P 1 DGN Ground
Payload_power_P 2 O3.3 Converter 1 V+ 3V3
Payload_power_P 3 DGN Ground
Payload_power_P 4 O5 Converter 2 V+ 5V
Payload_power_P 5 DGN Ground
Payload_power_P 6 OH Converter 3 V+ high power
Payload_data_P 1 CAN_H
Payload_data_P 2 CAN_L
Payload_data_P 3 I2C_SCL
Payload_data_P 4 I2C_SDA
Payload_data_P 5 SPI_CS0
Payload_data_P 6 SPI_SCLK
Payload_data_P 7 SPI_D0
Payload_data_P 8 SPI_D1
Payload_data_P 9 UART1_TXD
Payload_data_P 10 UART1_RXD
Payload_data_P 11 GPIO1_12
Payload_data_P 12 GPIO1_13
Electronics1.png


qbkit 3D printed structure

This section explains the 3d printed structure that acts as baseline for your creations. The parts has been designed to be printed in ABS or PLA and takes into account the tolerances of 3d printing non-professional machines. Test prints might be needed and CAD models adjusted depending on your printer, settings and materials. The 3d printed structure is composed of two main parts:

  • qbkit edu electronics box
  • qbkit edu structure

Most of qbkit edu structure parts join together without fasteners by using a pin to hole approach. The flexibility of the 3d printed material allows the assembly of the structure.

The CAD step files can be visualised and downloaded here.

A video showing the assembly can be seen here.

qbkit edu electronics box

qbkit electronics are fixed inside a 3D printed box consisting of two parts. This electronics box protects the qbkit edu electronics and allows them to be integrated into the qbkit edu structure.

3Dprint1.png

The lower part of the box contains holes were M2.5 nuts can be inserted. The upper part of the box contains countersunk through holes for M2.5 fasteners with a length of 20mm.


qbkit edu structure

qbkit edu structure is formed of three main elements:

  • Vertical elements: act as the main link for the elements inside the structure
  • Horizontal elements: link vertical elements. They also contain a feature that allows to insert an M2.5 nut in it to provide a mechanical interface to closure panels or exterior elements.
  • Closure panels / exterior elements: They mechanically interface with the horizontal elements with M2.5 fasteners.
3Dprint2.png


3Dprint3.png


MSD Tutorial example: Deployment from ISS

This section presents a tutorial example to familiarise the customer with the features that are contained within MSD.


Tutorial scenario: Deployment from ISS

In this scenario, it is assumed that the satellite is released from the International Space Station (ISS) at a specific date and time, T: 01/01/2001 at 16:30:00Z, with the following payload configuration:

  • Average P/L Consumption: 1.3 W
  • P/L Operation: Uninterrupted
  • P/L database generation: 2000 bps

The ground segment supporting this scenario includes TRS and KIR. The scenario will be studied over 1 sidereal day.

The ground segment supporting this scenario includes TRS and KIR. The scenario will be studied over 1 sidereal day.


Input of initial parameters

Within the System tab in the Inputs section of the MSD tool, introduce the following values:

  • Average P/L Power Consumption: 1.3
  • P/L Operation: Uninterrupted (sunlight + eclipse)
  • P/L datarate generation: 2000