Engineering Integrity Society

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60 Second Spotlight on Jarek Rosinski

60 Second Spotlight on Jarek Rosinski, Transmission Dynamics

Ahead of the Bolted Joints Seminar taking place on 8 February 2024 we caught up with Jarek Rosinski to hear his thoughts on the topic.

Please briefly explain your current role and involvement with bolted joints.

I have a vested interest in bolted joints technology spanning three decades and was involved in several high profile bolted joints failure investigations. This required development and implementation of very specialised instrumentation, which was often applied in rotating machinery applications. This also required signal transfer using bespoke telemetry instrumentation.

These cases led to the design of one of the first remote bolt tension monitoring devices globally back in 2012, involving initial collaboration with Valley Forge, Rotabolt and finally developing a global partnership with Copper State Bolt and Nut Co. from Phoenix Arizona which became the global distributor of BoltSense technology in 2022.

What changes have you seen in bolted joint technology over the past 5 years?

The biggest change in bolted joint technology over the past 5 years is the growing industry appetite for remote bolt tension monitoring.

What are some common challenges engineers face in your specific area of expertise and how will your presentation address these?

By far the most challenging applications of bolted joint technology are those when bolts are subjected to very high vibration levels and dynamics load fluctuations. Some examples are liner bolts used in SAG mil applications, which are subjected to regular impacts exceeding 150g. The combination of highly flexible interfaces and high vibration levels result in frequent issues with loss of tension and bolt failures. This is aggravated by high cost of breakdowns and associated downtime, often exceeding £50k per hour. Another challenge is the use of hydraulic tensioners, which systematically result in significant under-tensioning. My presentation addresses the above issues and proposes ways to overcome them.

Please briefly explain your role, involvement and experience in the field of net zero powertrain technology.

I work within the engineering team at IAAPS, where I predominantly work with our customers to test electric machines and drivelines. I am involved at all stages of development, from initial system level modelling to final component or driveline test.

What do you see as the key priorities for engineers working with bolted joints?

Better understanding of fundamental principles of bolted joints designs and operation. Engineers must understand that bolt tension is not simply related to torque applied during installation. Torque control is not tension control!

The presenters at the EIS seminar work in a variety of different sectors. What are the benefits of sharing bolted joint knowledge and approaches across different industries?

Nearly all industries use bolted joints in many critical applications. The diversity of presenter backgrounds helps in bringing different perspective and highlighting different challenges experienced by wide range of industrial applications.

In light of technological advancements and industry changes, how do you foresee the future of bolted joint technology evolving?

One could visualise the bolted joint technology evolving to the point when the majority of critical bolts will be instrumented as standard. Such instrumentation will not only help to correctly set the initial bolt tension but also to monitor bolt tension through the lifetime of critical assets.

What will you be presenting at the EIS seminar and how will this benefit participants?

My presentation will address the fundamentals of bolted joint operation (i.e. bolts are springs!) which will be followed by an accolade of case studies addressing the most common challenges and offering solutions based on significant past experience.

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