基於局部共振帶隙及可變頻率設計的共振子在伺服器的振動控制

Abstract

振動在工程中扮演至關重要的角色，振動對伺服器的負面影響近年來備受矚目。本研究聚焦於振動抑制的關鍵問題，並應用了一種新興方法，即超穎材料局部共振的應用，以改善伺服器中的硬碟存儲性能。超穎材料是一種人造材料，其特殊的結構設計使其能夠在如電磁波、聲波、振動波或其他波動的控制方面具有特殊的性能。利用局部共振的減振機制，能夠在特定頻率範圍內形成帶隙，用於抑制特定頻率的振動，降低振動傳遞和振幅，並有效地減少振動對結構的不利影響。本研究中，已知目標伺服器易受到300~400 Hz來自冷卻風扇振動的主頻及其倍頻之影響，利用局部共振的原理，設計出適合目標伺服器之幾何限制的局部共振子，並且藉由實驗驗證共振子具有良好的效果，相較原始機台情況，加了共振子的伺服器在頻譜密度圖的峰值振動下降了50%，硬碟讀寫效率經過測試提升了10%以上。

Vibration plays a crucial role in engineering, and the negative impact of vibrations on servers has gained significant attention in recent years. This study focuses on the critical issue of vibration suppression and applies an emerging method involving the application of local resonance in metamaterials to enhance hard drive storage performance in servers. Metamaterials are artificial materials whose unique structural design enables them to exhibit special properties in controlling waves, such as electromagnetic waves, sound waves, vibration waves, and other forms of vibrations. By leveraging the damping mechanism of local resonance, band gaps can be created within specific frequency ranges to suppress vibrations at those frequencies, reduce vibration transmission and amplitude, and effectively mitigate adverse effects on structures. In this study, it is known that the target server is particularly susceptible to the primary frequency vibrations of 300~400 Hz from cooling fans and their harmonics. Using the principle of local resonance, we designed local resonators suited to the geometric constraints of the target server. Experimental verification showed that these resonators significantly reduced peak vibration in the power spectral density by 50% and improved hard drive read/write efficiency by over 10% compared to the original server setup.