Purpose -The purpose of this paper is to explain a current implementation of a programmable and computational material, Logic Matter, and to describe potential applications for computational materials and self-guided assembly. Design/methodology/approach -Following an introduction, the paper describes the types of information currently found in architectural construction, then introduces Logic Matter, a building block embodying physical digital logic. Examples of structural optimization and construction scenarios are given, to demonstrate the benefits of programmable and computational physical materials for assembly. Findings -Logic Matter demonstrates a prototype with embedded digital logic and programmability, offering new applications for automated assembly, online material analysis and physical computing. Originality/value -The paper describes the existing types of architectural construction information and proposes a novel application of programmable and computational material for automated assembly.
Modernized control laws were developed to provide an attitude-command/attitude-hold response type for the UH-60 BLACK HAWK helicopter and thereby afford improved handling qualities for near-Earth operation in night and poor weather. The inner-loop system modernized control laws were implemented using the 10% authority stability augmentation system actuators and was evaluated in an EH-60L helicopter. Central to addressing the significant resource and technical challenges of this project was the extensive use of a modern integrated tool set. System identification methods provided an accurate flight-identified aircraft response model and allowed the efficient isolation of discrepancies in the block diagram-based simulation model. Additional key tools were real-time rapid prototyping and a well-designed picture-to-code process. Control laws were tuned to achieve the maximum design margin relative to handling qualities and control system performance requirements. The optimized design was seen to be robust to uncertainties in the identified physical parameters. A flight-test evaluation by three test pilots showed significant benefits of the optimized design compared to the BLACK HAWK standard flight control configuration.
With relatively little study done on the stability and control of coaxial multirotor UAV configurations, more data is required to accurately assess the benefits of the coaxial configuration compared to traditional multirotor configurations. In this paper, system identification of the 3DR X8+ aircraft, a coaxial quadrotor, via frequency domain system identification techniques were performed. The obtained dynamics were then used to design and optimize an Attitude Command/Attitude Hold control law utilizing the Explicit Model Following architecture. The results were compared with the results of a previously identified and optimized 3DR IRIS+, a quadrotor, with similar physical characteristics.
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