Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On sound insulation of pyramidal lattice sandwich structure   Pyramidal lattice sandwich structure (PLSS) exhibits high stiffness and
strength-to-weight ratio which can be effectively utilized for designing
light-weight load bearing structures for ranging from ground to aerospace
vehicles. While these structures provide superior strength to weigh ratio,
their sound insulation capacity has not been well understood. The aim of this
study is to develop numerical and experimental methods to fundamentally
investigate the sound insulation property of the pyramidal lattice sandwich
structure with solid trusses (PLSSST). A finite element model has been
developed to predict the sound transmission loss (STL) of PLSSST and simulation
results have been compared with those obtained experimentally. Parametric
studies is then performed using the validated finite element model to
investigate the effect of different parameters in pyramidal lattice sandwich
structure with hollow trusses (PLSSHT), revealing that the pitching angle, the
uniform thickness and the length of the hollow truss and the lattice constant
have considerable effects on the sound transmission loss. Finally a design
optimization strategy has been formulated to optimize PLSSHT in order to
maximize STL while meeting mechanical property requirements. It has been shown
that STL of the optimal PLSSHT can be increased by almost 10% at the
low-frequency band. The work reported here provides useful information for the
noise reduction design of periodic lattice structures.

4
The categories of this paper are: cond-mat
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg