P19345: Model Railroad Control Panel
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Systems Design

Table of Contents

Team Vision for System-Level Design Phase

During the Systems Design phase, our team had the goal of completing all assigned tasks and deliverables. These items included our functional decomposition, benchmarking documents, phase-appropriate feasibility, concept generation, systems architecture, and risk assessment. A challenge we faced early on in this phase was working through another iteration of our use cases from the problem definition phase. Through further refining our use cases to more accurately match our customer and engineering requirements, we were able to provide accurate details into our functional decomposition.

Functional Decomposition

To further understand the scope of our systems design, a high level functional decomposition was created. As a team, we identified necessary inputs with their desired outputs to aid us in the creation of our functional decomposition. The Functional Decomposition image traces through what actions are utilized through use of the model railroad system.
Top Level Functional Decomposition

Top Level Functional Decomposition

Functional Decomposition

Functional Decomposition

Engineering Requirements Mapping

 Engineering Requirements Mapping

Engineering Requirements Mapping

Benchmarking

The below images depict our benchmarking analysis for our two main deliverables, the modular control panel circuit prototype and the new layout brain. The products were selected based off of functionality for a model railroad system. The modular control panel circuit prototype was benchmarked against control panels, and the orange sections highlight what products are currently in use within RIT's Model Railroad Club system. The new layout brain was benchmarked against microcontrollers because the design we create will be a microcontroller, as requested by the customer. The below table titled New Layout Brain Microcontroller Benchmarking displays various options of microcontrollers in the market we could utilize for our system design.
Sandwich Board Benchmarking

Sandwich Board Benchmarking

New Layout Brain Microcontroller Benchmarking

New Layout Brain Microcontroller Benchmarking

Morphological Chart and Concept Selection

Morphological Chart

Morphological Chart

Concept Development

Concept Selection Chart

Concept Selection Chart

Concept Selection

Selection Criteria:
  1. Feasible for team to implement
  2. Reliable to transmit information (ie./ signals and commands)
  3. Modular
  4. Easy to integrate with existing systems
  5. Easy to modify
  6. Cost-effective
  7. Aligns with customer requirements
Example of Pugh Chart With Current System As Datum

Example of Pugh Chart With Current System As Datum

Feasibility: Prototyping, Analysis, Simulation

 Feasibility Question

Feasibility Question

All feasibility questions are answered in this document

Systems Architecture

Command Station

Layout Control Brain

Control Panel Controller

Control Panels

 System Architecture

System Architecture

 Raspberry Pi Zero pinout

Raspberry Pi Zero pinout

Risk Assessment

Within our risk register, we assigned all risks with a letter code. The risks we identified were based off of a 1-3-9 rating, 1 being least severe to 9 being most severe. The ratings were given to the severity of the risk and the likelihood of the risk occurring.

A risk register graph was created to depict where the majority of our risks fall in terms of severity and likelihood, as well as if any risks are added or deleted out.

Risk Register Visual Representation

Risk Register Visual Representation

Risk Register

Risk Register

To view risks with respect to their letter codes, please reference our risk register which can be found here.

Design Review Materials

P19345 System Design Review Powerpoint

Plans for next phase

Phase 3: Preliminary Detailed Design Plan

Phase 3: Preliminary Detailed Design Plan

As we go into the next phase, we will expand upon the referenced tasks to include all necessary actions required to complete them.

Individual Plans


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