It is generally alleged that the design choices of acoustic guitar bracing patterns lead to a specific sound of the instrument. However, in the presence of strong uncertainties due to variability of material properties and climatic conditions, the robustness of the soundboard dynamics has yet to be investigated. In this study, three types of bracing patterns are studied using physics-based models and stochastic analyses are performed to account for material and climatic uncertainties. It is shown that the choice of a brace design leads, at least in the low frequency domain, to a dynamic behaviour that is not stackable with another design, even in the presence of strong aleatory uncertainties. This assessment supports the conjecture that guitar brace design choices have a greater impact than material variability where guitar soundboard dynamics are concerned. More generally, these results illustrate the usefulness of detailed physics-based models in the understanding, design and making of guitars.

人们普遍认为，原声吉他支撑模式的设计选择会导致乐器的特定声音。然而，由于材料特性和气候条件的可变性存在很强的不确定性，音板动力学的稳健性还有待研究。在这项研究中，使用基于物理的模型研究了三种类型的支撑模式，并进行了随机分析以解释材料和气候的不确定性。结果表明，至少在低频域中，选择支架设计会导致动态行为，即使存在强烈的偶然不确定性，也无法与其他设计叠加。该评估支持这样一种推测，即吉他支架设计选择比材料可变性对吉他音板动态的影响更大。更一般地说，这些结果说明了基于物理的详细模型在吉他的理解、设计和制作中的有用性。