# Systems Engineering: Mechanical & Electrical Principles
> Master systems engineering with this guide on V-Models, GD&T, ISO standards, maintenance strategies, and project control metrics including EVM and FMEA.

Tags: systems-engineering, mechanical-engineering, iso-15288, v-model, gd-and-t, fmea, reliability-engineering
## Engineering Task Validation
- Methodology for Mechanical & Electrical systems aligned with INCOSE and IEC standards.
- Implementation of IEEE 15288 and ISO 9001 frameworks.

## The Systems Engineering V-Model
- Verification: Checking if the technical standard is met (Technical Check).
- Validation: Checking if client needs are met (User Check).
- Proper definition on the left side of the 'V' prevents integration failures on the right.

## Maintenance & Condition Monitoring
- **Corrective:** Run-to-failure for low-criticality items.
- **Preventive:** Scheduled time-based intervention.
- **Predictive:** Condition-based monitoring using vibration analysis and thermography.

## Project Control: Earned Value Management (EVM)
- Tracks project health using Schedule Performance Index (SPI) and Cost Performance Index (CPI).
- Formula: SPI = EV / PV; CPI = EV / AC.

## Requirements Engineering (ISO/IEC 29148)
- Functional Requirements: Specific system actions (e.g., torque/speed parameters).
- Non-Functional Requirements: Attributes like reliability (MTBF > 20,000 hours).

## Reliability and the Bathtub Curve
- Failure phases include Infant Mortality (Early Failure), Constant Failure Rate (Useful Life), and Wear Out (End of Life).
- Modeled using the Weibull Distribution function.

## Safety Integrity Levels (SIL)
- Defines Risk Reduction Factors based on Probability of Failure on Demand (PFD).
- SIL 4 provides the highest risk reduction (10,000 - 100,000).

## GD&T and Technical Drawings
- Geometric Dimensioning and Tolerancing (ASME Y14.5) uses Datums and Feature Control Frames.
- Circular tolerance zones increase usable area by 57% over square zones.

## Problem Identification: FMEA & FTA
- **FMEA:** Calculates Risk Priority Number (RPN) based on Severity, Occurrence, and Detection.
- **FTA:** Top-down deductive analysis using Boolean OR/AND gates to find system failure probability.
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