The Japan Aerospace Exploration Agency (JAXA) has relied on HBK’s data acquisition technology to investigate the structural health of recently developed aircraft made with composite materials. The research looked at the development of small to medium-sized jet passenger planes and was undertaken by JAXA as part of a collaborative project with the Tokyo Metropolitan Government and the Tokyo Metropolitan University (TMU).
HBK’s optical strain gauge systems were first used to undertake the structural testing of the ATD’s canard wing design by applying variable loads to the wing using a hydraulic actuator. One of the aims of the project was to monitor the effects of impact damage on the canard wing using 18-channel optical strain gauges. Researchers are also focusing on the development of a Health Monitoring System (HMS) for new wing structures using optical strain gauges.
The decision to utilize optical strain gages, as opposed to mechanical devices, was to minimize the possibility of any risk of explosion while ensuring that electromagnetic effect (EME) concerns did not impact on the results. A total of 20 optical strain gages were distributed on the wing to give the coverage needed for the stress calculations.
Researchers working on the project were able to save a significant amount of time in fitting the optical strain gauges with HBK’s patch over the time taken to fit standard mechanical strain gauges. The optical strain gauges are suitable for both dynamic and static tests on the structure.
In addition researchers used HBK's MGCplus in combination with three of HBK’s DI410 optical strain gauge interrogators. These are 4-channel devices with a capacity of up to 1,000 measurements/sec. Two of HBK’s M416 multiplexers were also used for connecting up to 320 optical measuring points to provide fully synchronized measurement in real time. Data capture and analysis was carried out with HBK’s catman Enterprise software connected to all the devices.
JAXA’s research focused on both developing the advanced composite structures as well as the smart technology for this next generation of aircraft. In parallel with JAXA’s research, the TMU undertook research into likely future avionics developments. The research involved two phases, both of which utilized HBK’s equipment for the testing regime. The first phase, which was undertaken in 2011, developed an Advanced Technology Demonstrator (ATD) as a business jet for up to 8 passengers. The second phase, which took place during 2012, looked at developing a regional jet for 120 passengers. Following the success of the tests on the ATD’s canard wing, a bigger composite structure for a wing in the region of 5 m long was built and static tests undertaken to examine the integrity of the fuel tanks that are located in the aircraft’s main wing. Both aircraft feature specially developed advanced carbon fiber reinforced laminates (CFRP). The high impact resistant laminates are reinforced by Vectran fiber through-the-thickness stitching to reduce any loss of structural strength through delamination.
The Japan Aerospace Exploration Agency (JAXA) was born through the merger of three institutions, namely the Institute of Space and Astronautical Science (ISAS), the National Aerospace Laboratory of Japan (NAL) and the National Space Development Agency of Japan (NASDA). It was designated as a core performance agency to support the Japanese government's overall aerospace development and utilization. JAXA, therefore, can conduct integrated operations from basic research and development, to utilization.
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