Purpose

The purpose of this work is to further develop the methodology for calculating the aircraft take-off mass and its main functional components for the conceptual analysis and synthesis of new projects.

Design/methodology/approach

The method is based on the assessment of changes in the take-off gross mass (TOGM) of the already developed project or already existing a basic version of the aircraft when making local mass changes for its modification or for the numerical researches to create a more advanced project. The method is based on the “sensitivity factors of mass” (SFM) of aircraft, which represents the ratio of TOGM to initial (local) mass changes of its main functional components. The method of analytical refined calculation of SFM for the initial mass change and the main aerodynamic characteristics is given.

Findings

In comparison with the long-known method based on weight (mass) growth factors, which were considered constant, this method takes into account the dependence from the value of the initial local mass change and its functional purpose.

Practical implications

This method allows the designer to calculate more strictly the final changes in the TOGM on the initial stages of conceptual design when finding new project solutions. Numerical calculations are given on the example of passenger aircraft. The dependence of SFM and TOGM and its functional masses on the value of the initial change of the structure mass are shown. This method is used in the educational process at the college of Aerospace Engineering in the Aircraft Design department.

Originality/value

The considered method based on SFM is simple and convenient and more accurate for conducting project research on many project parameters when analyzing and synthesizing a new project.

中文翻译：

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概念设计中飞机质量的敏感性因素

目的

这项工作的目的是进一步发展用于计算飞机起飞质量及其主要功能组成部分的方法，以用于新项目的概念分析和综合。

设计/方法/方法

该方法是基于对已开发项目或飞机现有基本版本的起飞总质量（TOGM）的变化进行评估的，该更改是在进行局部质量更改以进行修改或进行数值研究以创建更大质量的飞机时进行的。高级项目。该方法基于飞机的“质量敏感因子”（SFM），它表示TOGM与其主要功能组件的初始（局部）质量变化之比。给出了初始质量变化和主要空气动力学特性的SFM分析精细计算方法。

发现

与基于重量（质量）增长因子的长期已知方法（被认为是恒定的）相比，该方法考虑了初始局部质量变化值及其功能目的的依赖性。

实际影响

使用这种方法，设计人员可以在寻找新的项目解决方案时更严格地计算概念设计初始阶段TOGM的最终变化。数值计算以客机为例。显示了SFM和TOGM及其功能质量对结构质量初始变化值的依赖性。飞机设计系航空工程学院的教学过程中使用了这种方法。

创意/价值

考虑到的基于SFM的方法简单，方便且更准确，可用于在分析和综合新项目时对许多项目参数进行项目研究。