Integrated Vehicle Health Management: The light behind the fog

  • 18-Feb-2013 04:17 EST

Pioneers working in the field define IVHM as the “unified capability of a system of systems to assess the current or future state of the member system health, and integrate that picture of system health within a framework of available resources and operational demand.”

In technology-based industries, it is common to see a pattern that starts with the manufacturing and sale of a tangible product, and that gradually evolves from focusing on the product itself to deriving value from its performance. In other words, the service provided by the product, also referred to here as “asset,” turns out to be more valuable to the customer in the long run.

As manufactured products mature, what consumers look for tends to be more a matter of style (in most cases) and reliability (in virtually all cases).

The commercial aviation industry is no different. In fact, a modern rationale for Integrated Vehicle Health Management (IVHM) comes from the transformation that a number of OEMs are going through. That is, the segue from simply selling a product—one-time upfront revenue realization, and spare parts’ sales when needed—to providing a service that is much more sophisticated.

Services are now sold in which steady monthly income can be derived in return for the effective maintenance of the asset. The end result is what customers (operators and passengers alike) want: planes that fly reliably.

To guarantee that level of availability, a new set of highly technical capabilities is being developed as the underpinning technology to this transformation. And the idea of shedding light on foggy situations does apply: scheduled maintenance (known event) is less costly than unscheduled maintenance (unknown, foggy event).

Knowledge is power

In the past, OEMs and suppliers had very little say on how an airplane was used or maintained, with that responsibility falling mostly on the shoulders of the operators. Parts were shipped according to the requirements and timing of the aircraft owner.

Today, operators—i.e., airlines—are moving away from such tasks, concentrating their attention on profitably running the business of flying. OEMs and suppliers, on the other hand, are taking over the business of guaranteeing that the planes are ready and able to fly as expected.

That’s the new contract: availability, reliability, deep asset knowledge, and readiness. The cost of ownership is thus kept on budget, maximizing the potential for bigger margins.

Make no mistake: the impetus for the IVHM value proposition on the OEM side is a commercial one. It follows the desire to increase or maintain revenue by moving into maintenance, or to compete in a market that is being eroded by low-cost component suppliers.

Those working in this new field define IVHM as the “unified capability of a system of systems to assess the current or future state of the member system health, and integrate that picture of system health within a framework of available resources and operational demand.” (SAE IVHM Steering Group, 2011).

If only passive fault management and diagnosis needed to be addressed, the “I” in IVHM would not be necessary, nor would it be needed to take this capability to the level it can go. But, if the integrative process of bringing together data, reasoning, and good decision making is of interest, the challenge is much bigger.

It surpasses the need for next-gen sensors and overall smart computing, which are conditions sine qua non, going deeply into who, how, and when to deal with the information these sensors supply. In non-collaborative environments, this in itself requires a fundamental corporate culture change. Silos will not work here, as information is a key resource that will support problem resolution. If not shared, the resolution simply might not happen.

The technology of IVHM enables the collection of information on an object’s condition, performance, and location. It also facilitates the transmission of this information, often from hostile environments (e.g., inside a jet engine).

In the end though, it is how maintainers use this information that will really make a difference. Although there are quite sophisticated tools both for diagnostics and prognostics, what will fundamentally matter are the business drivers that the data will be used to support.

Maintaining technologies 

IVHM offers options to be considered by organizations that can be achieved through the monitoring of the health of an asset. Decisions can then be made based on the information that is collected.

Primarily, such decisions will enable the maintainer to better schedule maintenance based on actual performance and condition of an asset (the airplane itself, or any of its parts) rather than when a component fails or when regular maintenance cycle is performed. Any event that leads to a plane malfunction in between these two parameters can be flagged and addressed by consistently applying IVHM.

For passengers flying from NY to London (or anywhere else for that matter), this will be basically an invisible, behind-the-scenes situation. The good news is that airplanes will depart and arrive when they are supposed to with no untoward interruptions.

From the perspective of the operator, the result is having more planes in the air with a lot fewer unknowns on the ground (i.e., margin improvement and higher levels of customer satisfaction).

The technologies foundational to IVHM can be considered disruptive, as a technical innovation can immediately produce a new unexpected service offering with its subsequent effect on the market.

In a service-driven business, customers tend to expect more service each year. With the competition from third parties knocking at the door, this becomes, undoubtedly, a much more dynamic business than the product business.

Recent Airbus figures, from Aerotech 2011, predicted a 4.8% growth per year in civil aerospace for the next 20 years. It is also predicted that some 4500 aircraft will be replaced in the same amount of time.

According to the Flightpath 2050, a European report on the region’s vision for aviation global leadership, the goals ahead are significant:

• Getting 90% of travelers, door to door, anywhere in Europe in less than four hours

• Achieving less than one accident per 10 M flights

• Having air-traffic management infrastructure in place to handle 25 M flights/year

With these targets in mind, it will not be acceptable for a plane to be delayed at the gate for a “cause unknown.” The situation will demand the unequivocal location of a faulty LRU (Line Replaceable Unit), so it can be dealt with, getting the aircraft back on the runway.

It will also require a movement from accurate diagnosis of a fault, with fault forwarding so that the aircraft can be repaired on the ground, to prognostics where the necessary repair is known for some time in advance, and maintenance booked when convenient.

The industry is in the midst of the dawn of a new technological paradigm in commercial aviation. In the next decade or so, the technology behind IVHM will be both an enabler of new processes and a disruption to old ones, with its value affecting safety, operations, and the financial aspects of the business.

The rewards will be available to those who understand this change in the overall landscape and appreciate the magnitude of the challenges facing the industry. The time is now, as this enormous transformation will need disciplined stewardship of new risks taken.

Ian K. Jennions, Director of the IVHM Center, Cranfield University, wrote this article for Aerospace Engineering

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