Designing Quiet Structures Using Optimally Tuned Absorbers

这项拨款为研究静音噪音机器的设计方法提供资金。该方法将适用于厚的机器，如铸件，和薄的，如冲压件，外壳。对于厚套管，采用的策略是将厚套管包裹在带有调谐减振器的薄壳外壳中，以降低辐射噪声。将研究复合材料和金属外壳。薄外壳的策略将包括直接附加在结构上的调谐吸收器，以便在宽频带上进行被动噪声控制。将采用数值技术，包括有限元分析、声学和优化。研究还将侧重于开发具有调谐吸收器的有效动态分析，以及以吸收器位置和参数为变量的动态系统的优化。将考虑可制造性。如果成功，这项研究将导致设计更安静的电器、汽车和机器的技术，包括电力变压器、工厂车间机器和各种各样的家用电器。减少噪音是产品竞争的一个因素，现在越来越重视这类设备发出的噪音。

This grant provides funding for research toward a design methodology to quiet noisy machines. The methodology will apply to machines with both thick, such as castings, and thin, such as stampings, casings. The strategy adopted for thick casings will be to enclose the thick casing with a thin-shell enclosure incorporating tuned vibration absorbers to reduce radiated noise. Composite and metal enclosures will be studied. The strategy for thin casings will include the addition of tuned absorbers directly attached to the structure to allow passive noise control over a wide frequency band. Numerical techniques will be employed, including finite element analysis, acoustics and optimization. Research will also focus on the development of efficient dynamic analysis with tuned absorbers and on optimization for dynamic systems with absorber locations and parameters as variables. Consideration will be given to manufacturability. If successful, this research will lead to techniques for the design of more quiet appliances, automobiles and machines, including power transformers, factory floor machines, and a wide variety of household appliances. Noise reduction is a factor in product competition, and greater emphasis is being placed on noise emission from such devices.