本文選題：懸臂梁 + 顆粒阻尼��； 參考：《東北大學(xué)》2014年碩士論文

【摘要】：顆粒阻尼技術(shù)于二十世紀(jì)九十年代被提出,是一種新興的振動(dòng)被動(dòng)控制技術(shù)。該項(xiàng)技術(shù)是通過在系統(tǒng)結(jié)構(gòu)振動(dòng)的傳播路徑上,在系統(tǒng)結(jié)構(gòu)上加工一定數(shù)量的空腔或者在系統(tǒng)結(jié)構(gòu)上外置空腔結(jié)構(gòu),在其中填充一定數(shù)量的金屬顆�；蛘叻墙饘兕w粒。當(dāng)系統(tǒng)結(jié)構(gòu)受到激勵(lì)產(chǎn)生振動(dòng)時(shí),所填充的阻尼顆粒之間通過不斷的碰撞與摩擦運(yùn)動(dòng),消耗系統(tǒng)結(jié)構(gòu)所產(chǎn)生的振動(dòng)能量,能夠顯著提高系統(tǒng)結(jié)構(gòu)的阻尼特性,從而達(dá)到抑制系統(tǒng)振動(dòng)的目的。顆粒阻尼技術(shù)具有多種優(yōu)點(diǎn)：結(jié)構(gòu)簡單、成本低廉、阻尼性能良好,對(duì)系統(tǒng)的結(jié)構(gòu)改動(dòng)較小,且適用于高溫、腐蝕等惡劣的工作環(huán)境。本文在懸臂梁工件的基礎(chǔ)上,通過實(shí)驗(yàn)對(duì)影響顆粒阻尼性能的影響因素進(jìn)行了探索研究,主要工作內(nèi)容包括以下幾項(xiàng)：(1)闡述了顆阻尼離散單元法的基本原理及其一般過程,介紹了顆粒間的接觸力學(xué)模型,并基于接觸力學(xué)模型介紹了顆粒阻尼技術(shù)沖擊和摩擦的耗能機(jī)理。(2)確定需要考察的影響顆粒阻尼特性的因素,設(shè)計(jì)加工實(shí)驗(yàn)臺(tái),包括實(shí)驗(yàn)材料的購買,懸臂梁結(jié)構(gòu)的設(shè)計(jì)和加工,顆粒阻尼器的設(shè)計(jì),準(zhǔn)備好實(shí)驗(yàn)臺(tái)所需的設(shè)備儀器。確定實(shí)驗(yàn)方案和目的,介紹了半功率帶寬法計(jì)算阻尼比的方法原理。(3)針對(duì)不同的影響因數(shù),設(shè)計(jì)不同的實(shí)驗(yàn)方案,整理實(shí)驗(yàn)獲得的數(shù)據(jù),并根據(jù)數(shù)據(jù)規(guī)律來分析潛在的原因。實(shí)驗(yàn)主要分兩個(gè)部分,包括單筒大容積阻尼器實(shí)驗(yàn)和多筒小容積阻尼器實(shí)驗(yàn),實(shí)驗(yàn)?zāi)康拿鞔_有序。(4)實(shí)驗(yàn)最后考查顆粒質(zhì)量對(duì)顆粒阻尼性能的影響趨勢(shì),對(duì)獲得的數(shù)據(jù)進(jìn)行曲線擬合,并分析誤差,嘗試給出顆粒阻尼性能的定量化計(jì)算,也為以后的相關(guān)研究提供一定的數(shù)據(jù)基礎(chǔ)。(5)為了更全面的了解顆粒阻尼特性,本文還設(shè)計(jì)了其他實(shí)驗(yàn)安排,包括相同顆粒質(zhì)量不同填充率實(shí)驗(yàn),筒徑粒徑因素實(shí)驗(yàn),顆粒質(zhì)量相同的情況下單個(gè)大容積阻尼器與多個(gè)小容積阻尼器的對(duì)比實(shí)驗(yàn)等,并分析了每個(gè)實(shí)驗(yàn)規(guī)律的潛在原因。
[Abstract]:Particle damping is a new passive vibration control technique, which was proposed in 1990's. This technique is to fill a certain number of metal or non-metallic particles in the system structure by machining a certain number of cavities on the path of the vibration propagation of the system structure or by placing the cavity structure outside the system structure. When the system structure is excited to produce vibration, the damping characteristics of the system structure can be significantly improved by the continuous collision and friction motion between the filled damping particles, which consumes the vibration energy generated by the system structure. In order to suppress the vibration of the system. Particle damping technology has many advantages, such as simple structure, low cost, good damping performance, small structural changes to the system, and suitable for high temperature, corrosion and other harsh working environment. On the basis of the cantilever beam workpiece, the influence factors of the particle damping performance are studied through experiments. The main work contents include the following items: 1) the basic principle and the general process of the discrete element method of particle damping are expounded. The contact mechanics model between particles is introduced. Based on the contact mechanics model, the energy dissipation mechanism of impact and friction of particle damping technology is introduced. These include the purchase of experimental materials, the design and processing of cantilever structures, the design of particle dampers, and the preparation of equipment for the test rig. The experimental scheme and purpose are determined. The principle of half-power bandwidth method for calculating damping ratio is introduced. Aiming at different influence factors, different experimental schemes are designed, and the experimental data are sorted out, and the potential causes are analyzed according to the data rules. The experiment is mainly divided into two parts, including single cylinder large volume damper experiment and multi cylinder small volume damper experiment. The purpose of the experiment is clear and orderly. Finally, the influence of particle mass on particle damping performance is investigated. The curve fitting and error analysis of the obtained data are carried out, and the quantitative calculation of the particle damping performance is attempted, which also provides a certain data basis for the related research in the future) in order to understand the particle damping characteristics more comprehensively, Other experimental arrangements are also designed in this paper, including the experiment of different filling ratio of the same particle mass, the experiment of the diameter of cylinder diameter, the contrast experiment between single large volume damper and multiple small volume dampers with the same particle mass, and so on. The potential causes of each experimental rule are analyzed.
【學(xué)位授予單位】：東北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TB535.1

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