Broadband Response Diaphragm Materials for Human Acoustics Engineering

Hongfu Bi, Yuan Wei*, Yang Zhou, Yingying He, Chunyu Wang, Cheng Zhang, Jie Chen, Jiawei Cao, Xiaofeng Ding, Jianming Zhou, Gang Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

High-performance fiber-reinforced composite materials demonstrate great potential for manufacturing diaphragms in human-engineered acoustic loudspeakers. However, the notable scarcity of high-quality fibers and the uncontrollable nature of the diaphragm structure limit the production of high-quality sound that conforms to human hearing. In this study, a novel composite diaphragm material is devloped by integrating the swelling carboxymethyl cellulose microfiber (CMF) with the hot-melted sheath-core fiber (SCF) based on the “interpenetrating polymeric network” (“IPN”) strategy. Simulation methods and Flory-Huggins theory are applied to explain the mechanism of fiber-structure-property interaction in composite diaphragm materials. Owing to the distinct microstructure, this bio-based diaphragm material shows superior mechanical characteristics, including low density (≈0.92 g cm3), high tensile strength (≈235 MPa), and high modulus (≈9.73 GPa). Moreover, the loudspeaker mounted with bio-based diaphragm material exhibits enhanced sensitivity (≈82.6 dB) and stable performance across a broad frequency spectrum. This study not only elucidates the multiphysics working principles of loudspeakers but also establishes a crucial connection between the physical properties of diaphragms and loudspeaker performance. It opens up new avenues for the design of high-performance bio-based loudspeaker diaphragms in high-fidelity (Hi-Fi) acoustic devices.

Original languageEnglish
Article number2406559
JournalSmall
Volume21
Issue number1
DOIs
Publication statusPublished - 8 Jan 2025

Keywords

  • cellulose-based composite material
  • interpenetrating polymeric networks
  • loudspeaker diaphragm
  • multiphysics

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