Engineering capstone design process diagram template

flowchart TB
    A[Background research and requirements] --> B[Set design targets]
    B --> C[Generate concepts]
    C --> D[Compare and select a concept]
    D --> E[System-level design]
    subgraph X1[Detailed design]
        direction LR
        F1[Structure and calculations] --- F2[Controls and circuits] --- F3[Software]
    end
    E --> X1
    X1 --> G[Modeling and simulation]
    G --> H{Simulation meets targets}
    H -->|No| X1
    H -->|Yes| I[Build prototype or system]
    I --> J[Testing]
    J --> K{Design targets met}
    K -->|No| L[Find the cause and optimize] --> X1
    K -->|Yes| M[Compile drawings and data]
    M --> N[Write the design report]

Draw an engineering capstone design process diagram with Mermaid flowchart TB syntax. Background research and requirements, set design targets, generate concepts, compare and select a concept, system-level design. Use one subgraph for detailed design with three items joined by plain lines: structure and calculations, controls and circuits, software. Then modeling and simulation; if targets are not met, return to detailed design. If met, build the prototype or system and test it. If design targets are not met, find the cause, optimize and return to detailed design; if met, compile drawings and data and write the design report. Use diamonds for decisions and no parentheses in node text. Output only the mermaid code block.