Trade-off study of a variation aware determinate wing assembly against a traditional assembly strategy

Abstract

The present study introduces a trade-off framework to evaluate assembly concepts to make informed decisions for aircraft wing structures. This includes (1) the design of the assembly concepts and the estimation of the probability of achieving specific Assembly Key Characteristics, (2) the estimation of the associated costs for each assembly concept using technical cost modelling in combination with Monte Carlo simulation techniques to deal with the uncertainty of the input cost and process parameters and (3) the formulation of the decision matrix to assess the alternative concepts. The suggested trade-off concept can easily be expanded to include weight and performance criteria. Results for a 4m generic composite wing indicated that both conventional and determinate assembly can be successfully implemented with high value probabilities to achieve the predetermined assembly key characteristics.

Application of Advanced Simulation Methods for the Tolerance Analysis of Mechanical Assemblies

“…Two examples were considered in this work to study and prove the efficiency of the selected reliability methods for tolerance analysis problems. More specifically, the first assembly was adopted from [10] and concerns a simple arrangement of two parts on a fixture. The assembly sequence and indexing plan has been thoroughly presented in [10].…”

“…More specifically, the first assembly was adopted from [10] and concerns a simple arrangement of two parts on a fixture. The assembly sequence and indexing plan has been thoroughly presented in [10]. The AKC of interest is depicted in Fig.…”

“…The three methods are evaluated in terms of speed and accuracy against crude Monte Carlo simulation predictions. Initially, the case study is presented for an assembly consisted of two parts adopted from [10]. Although the example is elementary, it is adequate to highlight all the difficulties introduced in the estimation of the probability of defected products P D .…”

Toleransi dimensi dan geometri-Analisis rantai variasi dalam proses perakitan produk

“…Seperti pada disain komponen-komponen sebuah body mobil dan konponen rigid lainnya, fitur-fitur mate harus didisain secara benar untuk mengurangi penggunaan fixture pada proses perakitan komponen-komponen pesawat terbang yang akan mengurangi secara signifikan kompleksitas dari proses perakitan tersebut dan juga untuk mengurangi variasi yang muncul dari proses perakitan tersebut [Bacharoudis et al 2018]. Gambar 23 memberikan sebuah contoh bagaimana fitur-fitur mate berupa slot dan hole digunakan secara tepat untuk mendisain komponenkomponen pesawat terbang untuk menjamin nilai KC: jarak gap antara skin bagian atas dan bawah (lihat gambar 23) tetap dalam toleransi yang diinginkan.…”

“…Gambar 23: Contoh pentingnya penggunaan fitur mate untuk perakitan sebuah komponen pesawat terbang [Bacharoudis et al 2018].…”