噪声与振动控制
譟聲與振動控製
조성여진동공제
NOISE AND VIBRATION CONTROL
2014年
3期
15-19
,共5页
振动与波%变刚度弹簧%频响曲线%减振结构%动力特性
振動與波%變剛度彈簧%頻響麯線%減振結構%動力特性
진동여파%변강도탄황%빈향곡선%감진결구%동력특성
vibration and wave%variable-stiffness spring%frequency response curve%damping structure%dynamic characteristic
为了研究多级变刚度隔振系统的振动规律,建立变刚度弹簧结构振动分析模型,推导对于变刚度弹簧的理论解析解表达式,计算不同刚度情况下结构强迫振动的时域和频域振动曲线,比较不同频段的变刚度弹簧和定刚度弹簧的振动情况,并对全频段的振幅有效值和力传递率进行计算,根据经济性、减振效果、力传递等方面对变刚度减振结构的特性做出分析。结果表明在保证结构强度的前提下,变刚度结构在低频段的减振效果明显好于定刚度结构,在隔振区的振动效果也明显好于同等强度的定刚度结构,同时二级弹簧还有负向限位的作用。此变刚度结构对于工程中一些刚度变化的减振结构有一定的工程指导意义。
為瞭研究多級變剛度隔振繫統的振動規律,建立變剛度彈簧結構振動分析模型,推導對于變剛度彈簧的理論解析解錶達式,計算不同剛度情況下結構彊迫振動的時域和頻域振動麯線,比較不同頻段的變剛度彈簧和定剛度彈簧的振動情況,併對全頻段的振幅有效值和力傳遞率進行計算,根據經濟性、減振效果、力傳遞等方麵對變剛度減振結構的特性做齣分析。結果錶明在保證結構彊度的前提下,變剛度結構在低頻段的減振效果明顯好于定剛度結構,在隔振區的振動效果也明顯好于同等彊度的定剛度結構,同時二級彈簧還有負嚮限位的作用。此變剛度結構對于工程中一些剛度變化的減振結構有一定的工程指導意義。
위료연구다급변강도격진계통적진동규률,건립변강도탄황결구진동분석모형,추도대우변강도탄황적이론해석해표체식,계산불동강도정황하결구강박진동적시역화빈역진동곡선,비교불동빈단적변강도탄황화정강도탄황적진동정황,병대전빈단적진폭유효치화력전체솔진행계산,근거경제성、감진효과、력전체등방면대변강도감진결구적특성주출분석。결과표명재보증결구강도적전제하,변강도결구재저빈단적감진효과명현호우정강도결구,재격진구적진동효과야명현호우동등강도적정강도결구,동시이급탄황환유부향한위적작용。차변강도결구대우공정중일사강도변화적감진결구유일정적공정지도의의。
A simplified isolator model is put forward to investigate the dynamic characteristic of the variable-stiffness spring isolator system and the analytical solution of the variable-stiffness spring vibration is deduced. The vibration response curves in time-domain and frequency-domain of the variable-stiffness system under forced vibration are calculated. The vibration situations of the variable-stiffness spring and constant-stiffness spring are compared in different frequency ranges. And the efficient amplitude and force transmission rate in the whole frequency range are calculated. The damping characteristics of the variable-stiffness structure are analyzed according to its economy, damping efficiency and force transfer rate. It is shown that the variable-stiffness spring is more effective for vibration reduction than the constant-stiffness one in the low frequency range and in the sound insulation area under the same static mounting condition. The conclusion is useful to improve the dynamic performance of the vibration system in engineering.