Can you describe a scenario or example where the use of design of experiments (DoE) techniques was used to identify and mitigate technical risks in an engineering project, such as a new product development project?

Design of Experiments (DoE) for Mitigating Technical Risks in New Product Development

Background

The development of new products often involves complex technical tasks, requiring significant resources and investment. In the context of engineering projects, identifying and mitigating technical risks is crucial to ensure successful project outcomes. Design of Experiments (DoE) techniques provide a structured approach to analyzing relationships between variables, allowing engineers to identify potential risks and develop strategies for mitigation.

Case Study: Redesigning a Critical Component

A leading aerospace manufacturer was developing a new aircraft engine, incorporating advanced materials and designs. As part of the project, they aimed to redesign a critical component, which played a vital role in maintaining engine efficiency and performance.

Identifying Technical Risks

Initial design iterations faced several technical risks, including:

• Material Fatigue: The use of high-strength, low-alloy (HSLA) steel may lead to premature material fatigue.
• Thermal Expansion: Discrepancies in thermal expansion coefficients between the component and surrounding materials could cause structural issues.

Applying DoE Techniques

To address these risks, the engineering team employed DoE techniques:

Central Composite Design (CCD)

A CCD was used to investigate the effects of two key variables on material fatigue: temperature and load. The design consisted of 17 experimental points, with temperature ranges from -50°C to +150°C and load levels ranging from 100 N to 500 N.

Response Surface Modeling

The team employed response surface models (RSM) to analyze the relationships between variables and material fatigue. RSM revealed a significant interaction effect between temperature and load on material fatigue, indicating that optimizing one variable without considering the other could exacerbate the risk.

Mitigation Strategies

Based on DoE results:

1. Material Selection: The HSLA steel was replaced with a more suitable alternative, designed to exhibit improved fatigue resistance.
2. Cooling System Optimization: A new cooling system design was developed, incorporating thermally conductive materials and optimized thermal expansion coefficients to minimize the risk of structural issues.

Results

The use of DoE techniques allowed the engineering team to:

• Identify material fatigue as a primary technical risk
• Optimize the component design to mitigate material fatigue risks
• Reduce production costs by minimizing waste and rework
• Enhance overall engine performance and efficiency

By applying Design of Experiments (DoE) techniques, the aerospace manufacturer successfully addressed technical risks, ensuring the successful development of their new aircraft engine.