Calculation of rotor impedance for use in design analysis of helicopter airframe vibrations

Excessive vibration is one of the most prevalent technical obstacles encountered in the development of new rotorcraft. The inability to predict these vibrations is primarily due to deficiencies in analysis and simulation tools. The Langley Rotorcraft Structural Dynamics Program was instituted in 1984 to meet long term industry needs in the area of rotorcraft vibration prediction. As a part of the Langley program, this research endeavors to develop an efficient means of coupling the rotor to the airframe for preliminary design analysis of helicopter airframe vibrations. The main effort was to modify the existing computer program for modeling the dynamic and aerodynamic behavior of rotorcraft called DYSCO (DYnamic System COupler) to calculate the rotor impedance. DYSCO was recently developed for the U.S. Army and has proven to be adaptable for the inclusion of new solution methods. The solution procedure developed to use DYSCO for the calculation of rotor impedance is presented. Verification of the procedure by comparison with a known solution for a simple wind turbine model is about 75 percent completed, and initial results are encouraging. After the wind turbine impedance is confirmed, the verification effort will continue by comparison to solutions of a more sophisticated rotorcraft model. Future work includes determination of the sensitivity of the rotorcraft airframe vibrations to helicopter flight conditions and rotor modeling assumptions. When completed, this research will ascertain the feasibility and efficiency of the impedance matching method of rotor-airframe coupling for use in the analysis of airframe vibrations during the preliminary rotorcraft design process

Developing Ideas and Methods for Supporting Whole Body Interaction in Remote Co-Design with Children

Drawing from a present need as well as a growing interest towards developing methods to engage participants in research remotely [1,2], this workshop focuses on identifying opportunities and challenges around designing with children from an embodiment perspective [3,4,5,6,10,11,12,13,15]. Themed around whole body interaction and digital technologies [3,7,8,9,10,11,14,15,16,17,18,20,21] the aim of this workshop is to gain methodological insights for the remote participation of children in design, and arrive at design insights addressing the question how we can design remote, inclusive whole body interactions for and with children while attending to child participants’ multimodal communication and bodily engagement [19,21] in a physically dislocated setting [1,2]. The workshop will involve discussions around data gathering from different angles, including relational, ethical, safety and practical perspectives, to create a comprehensive picture of what it entails to orchestrate embodied co-design workshops with children virtually. Outputs from the workshop will contribute to the IDC community by offering methodological insights from attendees’ own experience and presented case studies from researchers and practitioners from both non-academic and academic settings to support children's embodied engagement in remote workshop situations and beyond