CN109630590B - 一种塔器用防振粘滞阻尼器 - Google Patents
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Abstract
本发明涉及一种塔器用防振粘滞阻尼器,包括销头、油缸、活塞杆、阻尼介质、活塞、阻尼器卡座及塔器连接件;该粘滞阻尼器相互呈90°排列,共4个,安装于40%‑60%塔器高度处。本发明给出了粘滞阻尼器结构参数的确定方法,并列出了相对阻尼系数、速度指数和相对刚度系数的取值范围,在阻尼器设计时,可直接供设计人员参照;通过实例,安装本发明所提出的粘滞阻尼器后,相比于原始塔器,可减少风致振动响应70.6%,减少地震响应70%,减振效果明显,适用于工程应用。本发明具有易设计、易安装、减振防振效果显著、易于推广的特点。
Description
技术领域
本发明应用于石油、化工和制药等行业,涉及一种塔器用防振粘滞阻尼器,主要应用在塔器承受风载荷或地震载荷时的减振防振装置设计。
背景技术
石油化工生产中广泛应用的塔器,具有高径比大、固有频率低和阻尼比小的特点,存在于精馏、萃取、吸收等诸多化工操作单元中。塔器由于结构特殊和工艺需求等原因,一般安放在露天环境中,并经常处于孤立的状态。因此,塔器除了承受自身载荷和操作载荷外,还包括风载荷和地震载荷。风致振动中较为常见且危害较大的是横风向振动,塔器在短时间内发生横风向振动会影响正常操作和产品质量,长时间共振甚至会造成设备的破坏甚至倒塌。特别是伴随着钢材料领域的不断发展和工艺方面提出的更高要求,塔器的设计和制造参数(高度、高径比等)越来越大,使得塔器变得越来越柔,阻尼不断减小,这使得塔器在风载荷和地震载荷作用下更加容易产生振动。
目前,塔器防振的措施主要有三种,即增大自振周期、采用扰流装置和增大阻尼比。对塔器来说,增大自振周期可能会破坏原有工艺条件,增加壁厚,增加制造成本;扰流装置则是目前化工塔器使用最多的防振措施,但其必须在设计时就予以考虑,若塔器安装完毕后,依旧发生大幅振动,则会束手无策;通过增设阻尼器来增大阻尼比则是最为简单方便、最适宜工程应用的措施。阻尼器属于耗能减振(震)技术,对结构的减振效果好,但是目前多集中在建筑工程领域刚性框架结构,未见对化工塔器的应用和相关研究。尽管粘滞阻尼器的主体结构及主体尺寸计算方法已趋于成熟,但阻尼器的设计与应用是与结构相匹配的,是服务于减振对象的。不同的减振对象,会与阻尼器构成不同的体系,此时,阻尼器的设计参数也需要更改。然而当服务对象为塔器时,由于塔用粘滞阻尼器的具体结构形式尚不明确,各部件的参数设计缺乏指导及规范,一直限制了塔用粘滞阻尼器的创新和发展,亟需一种具有详细结构并配有结构参数设计方法的塔用粘滞阻尼器,实现塔器的减振防振。
发明内容
本发明的目的是设计一种塔器用粘滞阻尼器,避免塔器在风载荷和地震载荷下产生大幅振动,实现减振防振。
本发明的原理是:通过在塔体和框架间增设粘滞阻尼器,增加系统的阻尼,将塔器振动所产生的能量借由粘滞阻尼器快速耗散,使塔体振幅迅速衰减,降低塔顶振幅,从而避免塔器发生振动破坏。
本发明的思路是:设计粘滞阻尼器结构,根据阻尼器理论模型,结合塔器结构参数,确定阻尼器各结构的具体参数,选定最优的安装位置,实现塔器的减振防振。
本发明技术方案如下:
一种塔器防振用粘滞阻尼器,包括销头1、油缸2、活塞杆3、阻尼介质4、活塞5、阻尼器卡座6组成,卡座通过螺栓固定在钢制框架7上,塔器连接件固定在塔器上。活塞在油缸内作往复运动,阻尼孔是在活塞上开有的小孔,以便阻尼材料流动,油缸内装满流体阻尼材料。阻尼器通过卡座固定在钢制框架上,活塞杆一端装有销头,并与塔器连接件通过万向轴承连接。阻尼器带来的阻尼器最终产生的阻尼力由式(1)计算。
F=2πmωCrξvα+Krω2mu (1)
式中:v—塔器振动速度,m/s;u—塔器振动位移,m;m—塔器质量,kg;ω—塔器一阶固有圆频率,rad/s;ξ—塔器阻尼比;Cr—相对阻尼系数;Kr—相对阻尼器刚度系数;α—流动指数,F—粘滞阻尼器产生的阻尼力,N。
在传统的建筑工程领域,被应用物体诸如钢架、高楼等刚度较大,粘滞阻尼器可被视作理想的,其仅具有耗能功能,不具备刚度,一般以非线性模型考虑,即式(1)只存在2πmωCrξvα这一项,因此粘滞阻尼器的耗能能力仅与被应用物体的运动速度有关,这就导致在速度较小时,易出现耗能不足的缺点。在将粘滞阻尼器应用于塔器时,一方面由于塔器结构高径比大,结构柔,自身刚度很小,安装粘滞阻尼器后,带来的附加刚度不能忽略,并且为了避免速度小耗能不足这一缺点,本发明同时考虑其耗能作用和刚度作用,即为式(1)所示。观察式(1)可知,参数v、u、m、ω和ξ为塔器参数,为已知条件。而Cr、Kr和α为粘滞阻尼器参数,由其结构决定,由于本发明同时考虑耗能和刚度作用,上述三个参数存在耦合关系,本专利在所发明粘滞阻尼器结构的基础上,给出了所有参数的选取范围,极具创新性和工程应用价值。
结合图1、图2和图3,本发明的具体步骤如下:
(1)根据设计文件及图纸,查取塔器一阶固有圆频率ω、塔器阻尼比ξ和塔器质量m。
(2)确定粘滞阻尼器相对阻尼系数Cr,其值为1.65~3.30。
(3)确定粘滞阻尼器流动指数α,其值为0.2~1。
(4)确定粘滞阻尼器相对刚度系数Kr,其值为0.65~2。
(5)选择所需阻尼液,推荐采用甲基硅油,查取其稠度系数k和流动指数α,初步确定粘滞阻尼器的结构参数:活塞宽度l,油缸内径D,活塞杆直径d,活塞中小孔组数s,小孔个数n,小孔直径d。
(6)将步骤5中的参数代入式(2),计算相对阻尼系数:
式中:k—稠度系数;l—活塞宽度,mm;D—油缸内径,mm;d—活塞杆直径,mm;s—小孔组数;ni—小孔个数;di—小孔直径,mm;α—流动指数。
(7)步骤6中所得的值是否与步骤2相符,若相等,则粘滞阻尼器结构参数确定,若不相符,返回至步骤5,推荐调整活塞宽度及活塞杆直径两个参数,直至相对阻尼系数值相等,粘滞阻尼器的各部分结构如图2所示。
(8)粘滞阻尼器安装高度为40%-60%塔器高度,相互呈90°,共安装4个。
(9)粘滞阻尼器置于阻尼器卡座中,卡座与框架通过螺栓连接,塔器连接件焊接在塔器上,且与销头通过万向轴承连接,安装方式如图3所示。
本发明的核心是上述步骤(2)~(4)中相对阻尼系数Cr、流动指数α和相对刚度系数Kr的确定以及阻尼器的推荐安装方式,上述步骤中各参数确定的过程如下:
(a)利用Kelvin理论公式计算粘滞阻尼器的回滞曲线,通过对比回滞曲线的饱满度,确定相对阻尼系数Cr和流动指数α的初步取值范围。
(b)利用ANSYS软件建立塔器有限元模型,进行模态分析,并与实测数据对比,验证数值模拟模型的准确性。在此基础上,将风载荷加载在塔器模型上,模拟塔器在风中的振动,获得风载荷下的塔顶振幅;将地震波以加速度的方式施加于塔底,模拟地震载荷,获得地震作用下的塔顶振幅。
(c)采用COMBIN14单元模拟粘滞阻尼器,并将其加载在模型对应位置上,根据(a)中初选参数范围,设定各参数的值,并逐步改变。
(d)采用瞬态动力学分析,分别在风载荷以及地震载荷下进行瞬态时域分析。
(e)比较各阻尼参数下塔顶位移、各部位应力及能量变化,以无量纲的形式确定出各参数的最优取值范围。
(f)在阻尼器参数选取后,在相同的粘滞阻尼器参数下,更改阻尼器安装高度及安装个数(单边或对称),最终得到与本发明参数配套的阻尼器安装位置及安装个数。
本发明的效果是:
相比于原始塔器,在风载荷作用下,塔顶振幅可降低70.6%,整体截面应力相对于原始塔器大幅降低。在地震载荷作用下,框架塔塔顶位移均方根值、框架塔各部位应力均方根值降低70%左右。本发明所设计的粘滞性阻尼器结构简单,安装方便快捷,减振效果明显,可显著降低塔器的振幅及应力,减少事故发生,确保安全生产。
附图说明
图1为粘滞阻尼器设计路线图;
图2为粘滞阻尼器装置简图;
图3为粘滞阻尼器安装位置简图;
其中:1-销头、2-油缸、3-活塞杆、4-阻尼介质、5-活塞、6-阻尼器卡座、7-钢制框架、8-塔器连接件、9-塔器。
具体实施方式
为了便于理解本专利,下面将根据附图对本发明做进一步详细说明:
实施例1:
该实例以一座小试塔器为对象,采用本专利所提出的粘滞性阻尼器进行减振防振,该粘滞阻尼器如图2所示,包括销头1、油缸2、活塞杆3、阻尼介质4、活塞5、阻尼器卡座6组成,具体设计流程如下:
步骤1:根据设计图纸,查到该塔器一阶固有圆频率为7.364rad/s,阻尼比为0.0203,总质量为4.03kg。
步骤2:初定粘滞阻尼器参数如下:
选用7000号甲基硅油作为阻尼介质,查得稠度系数k=8.663Pa.s,α=0.97
步骤3:按照式(2)计算相对阻尼系数:
步骤4:相对阻尼系数符合,结构确定。
步骤5:按照式(1)计算粘滞阻尼器带来的附加阻尼力:
F=2πmωCrξvα+Krω2mu=4.0v0.97+218.5u
步骤6:评价减振防振效果,根据图2所示的安装方式,将粘滞阻尼器相互呈90°(共4个)安装于塔高50%处。根据实验结果及理论公式计算验证,在风振情况下可使原塔器的位移由39.5mm减小为5mm以下,降幅达87%以上,在地震情况下,位移均方根值降低78.2%,减振效果明显。
实施例2:
将本发明所提出的粘滞阻尼器应用于另一塔器时,其设计步骤如下:
步骤1:根据设计图纸,查到该塔器一阶固有圆频率为12.566rad/s,阻尼比为0.01,总质量为7.66kg。
步骤2:初定粘滞阻尼器参数如下:
仍选用7000号甲基硅油作为阻尼介质,查得稠度系数k=8.663Pa.s,α=0.97
步骤3:按照式(2)计算相对阻尼系数:
步骤4:相对阻尼系数不符合1.65~3.30,重新确定其结构参数。
步骤5:调整活塞杆径为6mm及活塞宽度1mm,再次计算相对阻尼系数。
Cr=3.06
步骤6:相对阻尼系数符合要求,结构参数确定。
步骤7:按照式(1)计算粘滞阻尼器带来的附加阻尼力:
F=2πmωCrξvα+Krω2mu=18.51v0.97+1209.547u
步骤6:评价减振防振效果,根据图2所示的安装方式,将粘滞阻尼器相互呈90°(共4个)安装于塔高50%处。根据实验结果及理论公式计算验证,在风振情况下可使原塔器的位移降幅达80%以上,在地震情况下,位移均方根值降低75%,减振效果明显。
Claims (7)
1.一种塔器用粘滞阻尼器,其特征是阻尼器通过卡座固定在钢制框架上,活塞杆一端装有销头,并与塔器连接件通过万向轴承连接;阻尼器带来的阻尼器最终产生的阻尼力由式(1)计算;
F=2πmωCrξvα+Krω2mu (1)
式中:v—塔器振动速度,m/s;u—塔器振动位移,m;m—塔器质量,kg;ω—塔器一阶固有圆频率,rad/s;ξ—塔器阻尼比;Cr—相对阻尼系数;Kr—相对阻尼器刚度系数;α—流动指数;F—粘滞阻尼器产生的阻尼力,N。
2.如权利要求1所述的阻尼器,其特征是设计步骤如下:
(1)根据设计文件及图纸,查取塔器一阶固有圆频率ω、塔器阻尼比ξ和塔器质量m;
(2)确定粘滞阻尼器相对阻尼系数Cr,其值为1.65~3.30;
(3)确定粘滞阻尼器流动指数α,其值为0.2~1;
(4)确定粘滞阻尼器相对刚度系数Kr,其值为0.65~2;
(5)选择所需阻尼液,查取其稠度系数k和流动指数α,初步确定粘滞阻尼器的结构参数:活塞宽度l,油缸内径D,活塞杆直径d,活塞中小孔组数s,小孔个数n,小孔直径d;
(6)将步骤5中的参数代入式(2),计算相对阻尼系数:
式中:k—稠度系数;l—活塞宽度,mm;D—油缸内径,mm;d—活塞杆直径,mm;s—小孔组数;ni—小孔个数;di—小孔直径,mm,α—流动指数;
(7)步骤(6)中所得的值是否与步骤(2)相符,若相等,则粘滞阻尼器结构参数确定,若不相符,返回至步骤(5),推荐调整活塞宽度及活塞杆直径两个参数,直至相对阻尼系数值相等;
(8)粘滞阻尼器安装高度为40%-60%塔器高度,相互呈90°,共安装4个;
(9)粘滞阻尼器置于阻尼器卡座中,卡座与框架通过螺栓连接,塔器连接件焊接在塔器上,且与销头通过万向轴承连接。
3.如权利要求2所述的阻尼器,其特征是在确定相对阻尼系数Cr、流动指数α和相对刚度系数Kr时,利用ANSYS软件建立塔器有限元模型,进行模态分析,并与实测数据对比,验证数值模拟模型的准确性;在此基础上,将风载荷加载在塔器模型上,模拟塔器在风中的振动,获得风载荷下的塔顶振幅;将地震波以加速度的方式施加于塔底,模拟地震载荷,获得地震作用下的塔顶振幅。
4.如权利要求2所述的阻尼器,其特征是在确定相对阻尼系数Cr、流动指数α时,利用Kelvin理论公式计算粘滞阻尼器的回滞曲线,通过对比回滞曲线的饱满度,确定相对阻尼系数Cr和流动指数α的初步取值范围,采用COMBIN14单元模拟粘滞阻尼器,并将其加载在模型对应位置上,根据初步取值范围,设定各参数的值,并逐步改变。
5.如权利要求2所述的阻尼器,其特征是采用瞬态动力学分析,分别在风载荷以及地震载荷下进行瞬态时域分析。
6.如权利要求2所述的阻尼器,其特征是在确定相对阻尼系数Cr、流动指数α和相对刚度系数Kr时,比较各阻尼参数下塔顶位移、各部位应力及能量变化,以无量纲的形式确定出各参数的取值范围。
7.如权利要求2所述的阻尼器,其特征是在阻尼器参数选取后,在相同的粘滞阻尼器参数下,更改阻尼器安装高度及安装个数,最终得到与阻尼器参数配套的安装位置及安装个数。
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