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Acoustic Tone Researcher

Published
Testing New Brighton , Region of Wallonia , Belgium Fixed Term contract Full-time PhD, Doctorate More than 5 years
Published

Job Description

Summary:
Engine testing is mandatory for various reasons, and a stable, undisturbed environment is mandatory to let the aero engine operate. However, in some particular conditions, instabilities could occur, leading to disturbance on the engine function. This could lead to unacceptable vibrations, very loud noise and failure by fatigue of different parts including engine parts. Levels as high as 160 dB can be reached at single frequencies, this is called a tone. The aim of this research is to investigate the main creation mechanisms of this tone.
Generally, tones can be explained through the complex interactions between airflow instability, acoustics and mechanical vibration. The research will be hence oriented towards the numerical and experimental prediction and correlation of tones occurring in different combinations of test cells configurations and engine types/regimes.
A first phase of the research consists of a literature survey and briefing by Safran Test Cells of several situations of tones observed. The researcher will summarize all families of tones into categories that could lead to several path of investigations in the next phases. An experimental and a numerical phase will follow this initial phase.

Essential Job Functions:
• Conduct research about the tone origin, the prediction, the mitigation actions.
• Support the development of numerical tools aimed to represent the tone phenomenon, by coupling aero unsteadiness, acoustics and vibration
• Support the development of subscale prototypes to demonstrate the phenomenon at subscale and determine the effect of the variation of the key design parameters
• Exploit the existing tone data from Safran Test Cells and define a convenient way to measure more accurately, and process the data in the future.
• Establish the best test cell design practices to mitigate all kinds or tones
• Propose a predesign tool to predict the situation with the more risk and identify the design parameters combination that need to be avoided
• Actively participate in a continuous improvement culture providing recommendations and implementing enhancements to current methods and procedures.
• Other duties as assigned.

Job Requirements

Education and Experience:
• PhD in Aerospace Engineering or related field OR should prove at least 4 years of relevant research experience

Qualifications:
• Strong technical and analytical research skills.
• Demonstrate accuracy and thoroughness; actively seeks opportunities to improve and promote quality and monitors own work to ensure quality is met.
• Self-motivated, organized, able to multi-task, prioritize and excel in a fast-paced environment while exercising initiative and judgment as well as making decisions within scope of assigned authority.
• Solid analytical and problem-solving skills including problem identification, analysis, action planning and execution.
• Demonstrate accuracy and thoroughness; actively seeks opportunities to improve and promote quality and monitors own work to ensure quality is met.
• Self-motivated, organized, able to multi-task, prioritize and excel in a fast-paced environment while exercising initiative and judgment as well as making decisions within scope of assigned authority.
• Solid analytical and problem-solving skills including problem identification, analysis, action planning and execution.
• Should have spent less than 12 months in Belgium in the past 36 month-period (citizenship or nationality is not a requirement)
• Willingness to work and live in Wallonia, Belgium, where the research project will be held

Specificity of the job

• Willingness to work and live in Wallonia, Belgium, where the research project will be held

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Safran is an international high-technology group, operating in the aviation (propulsion, equipment and interiors), defense and space markets. Its core purpose is to contribute to a safer, more sustainable world, where air transport is more environmentally friendly, comfortable and accessible. Safran has a global presence, with 76,800 employees and sales of 15,3 billion euros in 2021 and holds, alone or in partnership, world or regional leadership positions in its core markets. Safran undertakes research and development programs to maintain the environmental priorities of its R&T and innovation roadmap.

Safran was ranked as the world's third best employer in its sector by Forbes magazine in 2021.

Safran Aero Boosters designs, develops and manufactures low-pressure compressors, equipment and test cells for aerospace propulsion. The company's products are on board the majority of commercial aircraft in service as well as Europe's Ariane launch vehicle. Based in Liège (Belgium), Safran Aero Boosters has two subsidiaries in the United States and employs 1,800 people.

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