Airbus Helicopters enhances hydraulic design simulation with help of Siemens PLM Software
In 1993, NHIndustries, mainly owned by the Eurocopter group (now Airbus Helicopters), started to design the NH90, a medium-sized military helicopter. Thirteen years later, it entered service.
The pace of technological change has increased so rapidly and the competition has become so fierce that helicopter manufacturers usually have no more than four years to develop their most sophisticated models. As a result, manufacturers must make better design choices and validate systems integration early in the design process, using modeling all along the V-cycle.
In addition, rotorcraft manufacturers must provide their customers with reliable pilot training solutions. However, flight simulators must often be delivered before the first helicopter is produced. The level D full flight simulator (FFS), which is the current standard with comprehensive high-fidelity aerodynamic and systems modeling, is increasingly being requested, most recently for the Eurocopter EC175, Airbus Helicopters’ new medium-sized twin-engine helicopter.
Investing in simulation
Airbus Helicopters, part of the Airbus Group, is Europe‘s leading fully-integrated aeronautical company, known for its high-performance, cost-effective, safe and comfortable helicopters.
To maintain its leadership position, the company has invested in virtual testing to meet different needs along the development cycle, such as rapid prototyping, desktop simulation, real-time pilot-in-the-loop simulation, test rig development and training solution production. Airbus Helicopters’ simulation policy stipulates that, if possible, a unique model should be used for each component throughout the V-cycle.
This approach had already been used for avionics equipment, flight control kinematics and aircraft environment modeling, such as wind, atmosphere and ground conditions. However, to apply this simulation approach to physical system modeling, Airbus Helicopters needed a tool that would ensure high predictability and easy model integration into the real-time environment. The company had such a tool in LMS Imagine.Lab Amesim™ software from Siemens PLM Software.
Reducing cycle time and costs
Airbus Helicopters has used LMS Amesim since 2007 for hydraulic and air-conditioning system simulation. In 2009, the company extended the use of LMS Amesim to thermo-hydraulic component and system modeling.
Prior to adopting LMS Amesim, specialists in the Hydraulic and Flight Controls Department were only able to obtain a quasi-static representation of the hydraulic system. The majority of parameters were determined during the prototype testing phase. Moreover, these hydraulics models were incompatible with a broader co-simulation environment. To take into account the behavior of the hydraulic circuit in real-time simulation, Airbus Helicopters used to build another model using a specification that a hydraulics specialist had prepared for a supplier, but those simulations had not been predictive and required the involvement of the hydraulic engineer.
The use of LMS Amesim enabled hydraulics design engineers to move from a quasi-static to a dynamic world. Now, not only can they model hydraulic systems and subsystems, such as pumps, actuators or tanks, they can also use the same model to gain insight into the systems behavior when interacting with thermal, mechanical or electrical systems.
“By using LMS Amesim for the hydraulic system design, we estimate that we have reduced optimization time by a factor of 3, and prototype costs by a factor of 4,” says Thibaut Marger, analysis and simulation specialist in the Hydraulic and Flight Controls Department at Airbus Helicopters Research and Development. “The first prototype that we manufacture is to fine-tune the LMS Amesim model. The system optimization is performed virtually. That leads to the creation of a new prototype that is very close to optimizing performance.”
Providing top-notch services
Siemens PLM Software has recently helped Airbus Helicopters find a solution to carry out real-time simulation, which supports the development of test rigs and system engineering. The next step will be the design of full flight simulators.
Thanks to its experience in methodology development, LMS™ Engineering services provided Airbus Helicopters with best-in-class support to convert hydraulic circuit plant models built using LMS Amesim into real-time compatible models. These models were then used on Airbus Helicopters’ unique real-time simulation platform for the development of the Eurocopter EC175.
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