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"Aircraft models"
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A decision model of civil aircraft structural maintenance based on improved fuzzy comprehensive evaluation
As Chinese domestic civil aircraft are in the early stages of operation, the accumulated operational experience is limited. Maintenance outside the Structure Repair Manual (OSRM) is therefore frequently encountered during structural maintenance, which significantly impacts the safety and economic viability of civil aircraft operations. To address this challenge, this study proposes an OSRM maintenance decision model based on an improved fuzzy comprehensive evaluation, which makes full use of historical cases from similar aircraft models to improve maintenance efficiency. The study is in line with the characteristics of the initial operation phase of domestically produced civil aircraft, achieving the full utilization of limited historical data. It avoids the long decision-making cycles and low decision accuracy caused by limited data in the past, safeguarding the development of domestic civil aircraft.
Journal Article
Military drones
\"Readers get a crash course in military drones through this text, which explains the science and technology behind one of todays most polarizing topics.\"--Provided by publisher.
Book
Linear and Nonlinear Models for Drop Simulation of an Aircraft Landing Gear System with MR Dampers
In this study, our focus is on the drop test simulation of an MR (Magnetorheological) damper-based main landing gear (MRMLG), aiming to explore multi-degree-of-freedom (DOF) dynamic models during aircraft landing. Three different 6-DOF dynamic models are proposed in this work, and their drop performances are compared with results achieved by commercial software. The proposed models include a nonlinear aircraft model (NLAM); a linearized approximated aircraft model (LAAM) linearizing from the nonlinear equations of motion in NLAM; and a fully approximated aircraft model (FAAM) which linearizes the MRMLG’s strut force model. In order to evaluate the drop performance of the aircraft landing gear system with MR dampers, a 7-DOF aircraft model incorporating the nonlinear MRMLG was formulated using RecurDyn. The principal comparative parameters are the coefficient of determination (R2) for the system response of each model with the RecurDyn model and root mean square error (RMSE), which is the ensemble of CG displacement data for each model. In addition, the ensemble of time series data is created for diverse drop scenarios, providing valuable insights into the performance of the proposed drop test models of an aircraft landing gear system featuring MR dampers.
Journal Article
Analysis and study on the minimum allowable clearance between civil aircraft fan cowling and flaps
In the development of civil aircraft, the evaluation of the minimum allowable clearance between the fan cowl opening and flaps is a crucial factor in determining the maintainability of civil aircraft and an essential aspect of the development process for civil aircraft models. To ensure that the aircraft does not experience poor maintainability or interference issues during ground maintenance due to insufficient clearance, this paper proposes a clearance analysis method to study the minimum allowable clearance between the fan cowl opening and flaps during maintenance. The paper outlines the approach to clearance analysis, explains the principles of clearance control, and discusses factors influencing clearance. Finally, using a specific aircraft as a case study, the paper provides a detailed description of the factors to be considered in calculating and analyzing the minimum allowable clearance between the fan cowl opening and flaps. The research results also demonstrate the practical engineering value of this clearance analysis method.
Journal Article
Research on environmental envelope verification methodology for civil aircraft
This study focuses on the verification of environmental envelopes for civil aircraft. By analyzing the characteristics of the environmental envelope and interpreting the provisions of the airworthiness regulation CCAR 25.1527, the research confirms the compliance approach for environmental envelope verification, as well as the compliance activities for each discipline and system. While ensuring the completeness of the verification process, it identifies the need for localized environmental temperature validation in structural components and cabin compartments. Using accessory compartment data from a representative aircraft model as an example, and adopting a combined approach of test flights and computational analysis, an engineering-based temperature model is established. This model enables the correlation between temperature limits for structures and systems and the external atmospheric temperature.
Journal Article
Remote controlled planes
\"Introduces the reader to remote control planes.\"-- Provided by publisher.
Book
Design method of derated thrust based on route operation takeoff performance requirements
Civil aircraft manufacturers typically set multiple levels of takeoff thrust for an aircraft. To define the requirements for these different thrust levels during the design phase, this paper analyzes the distribution of domestic airports and flight routes, examines the payload-range performance of a certain civil aircraft model and the impact of takeoff thrust on takeoff weight, and also explores how load factors on different routes affect takeoff weight. Additionally, the reduced-thrust performance of other foreign aircraft is analyzed. Based on a forward-design approach, three levels of takeoff thrust requirements are proposed for this aircraft model. This solution can effectively reduce airline operating costs.
Journal Article