<>
html {
color: #000;
background: #fff;
}
body,
div,
dl,
dt,
dd,
ul,
ol,
li,
h1,
h2,
h3,
h4,
h5,
h6,
pre,
code,
form,
fieldset,
legend,
input,
textarea,
p,
blockquote,
th,
td {
margin: 0;
padding: 0;
}
table {
border-collapse: collapse;
border-spacing: 0;
}
fieldset,
img {
border: 0;
}
address,
caption,
cite,
code,
dfn,
em,
strong,
th,
var,
b {
font-: normal;
font-weight: normal;
}
ol,
ul {
list-: none;
}
caption,
th {
text-align: left;
}
h1,
h2,
h3,
h4,
h5,
h6 {
font-size:100%;
font-weight:normal;
}
pre {
white-space: pre;
white-space: pre-wrap;
word-wrap: break-word;
}
abbr,
acronym {
border:0;
font-variant:normal;
}
/*
* 1. Addresses CSS quotes not supported in IE6/7
* 2. Addresses quote property not supported in S4
*/
/* 1 */
q {
quotes: none;
}
/* 2 */
q:before,
q:after {
content: '';
content: none;
}
/*
* Prevents sub and sup affecting line-height in all browsers
* gist.github.com/413930
*/
sub,
sup {
font-size: 75%;
line-height: 0;
position: relative;
vertical-align: baseline;
}
sup {
top: -0.5em;
}
sub {
bottom: -0.25em;
}
/*
* links
*/
/*
* Addresses outline displayed oddly in Chrome
*/
a:focus {
outline: thin dotted;
}
/*
* Improves readability when focused and also mouse hovered in all browsers
* people.opera.com/patrickl/experiments/keyboard/test
*/
a:hover,
a:active {
outline: 0;
}
/*
* form
*/
/*
* 1. Corrects color not being inherited in IE6/7/8/9
* 2. Corrects text not wrapping in FF3
*/
legend {
border: 0; /* 1 */
white-space: normal; /* 2 */
color:#000;
}
button,
input,
select,
textarea {
font-family:inherit;
font-size:inherit;
font-weight:inherit;
vertical-align: baseline;
*vertical-align: middle;
}
/*
* Addresses FF3/4 setting line-height on 'input' using !important in the UA sheet
*/
button,
input {
line-height: normal; /* 1 */
}
/*
* 1. Improves usability and consistency of cursor between image-type 'input' and others
* 2. Corrects inability to clickable 'input' types in iOS
* 3. Removes inner spacing in IE7 without affecting normal text inputs
* Known issue: inner spacing remains in IE6
*/
button,
input[type="button"],
input[type="reset"],
input[type="submit"] {
cursor: pointer; /* 1 */
-webkit-appearance: button; /* 2 */
*overflow: visible; /* 3 */
}
/*
* 1. Addresses box sizing set to content-box in IE8/9
* 2. Removes excess padding in IE8/9
* 3. Removes excess padding in IE7
Known issue: excess padding remains in IE6
*/
input[type="checkbox"],
input[type="radio"] {
box-sizing: border-box; /* 1 */
padding: 0; /* 2 */
*height: 13px; /* 3 */
*width: 13px; /* 3 */
}
/*
* Removes inner padding and border in FF3+
* www.sitepen.com/blog/2008/05/14/the-devils-in-the-details-fixing-dojos-toolbar-buttons/
*/
button::-moz-focus-inner,
input::-moz-focus-inner {
border: 0;
padding: 0;
}
/*
* FF3的一些版本hidden没有隐藏
*/
input[type="hidden"] {
display: none!important;
}
/*
* 1. Removes default vertical scrollbar in IE6/7/8/9
* 2. Improves readability and alignment in all browsers
* 3. 不让textarea可以resize
*/
textarea {
overflow: auto; /* 1 */
vertical-align: top; /* 2 */
resize: none; /* 3 */
}
/*
* font
*/
/*
* 1.333为默认行高16px(16/12),去除sans-serif防止ie8\9下字体变形
*/
body {
min-width: 1280px;
height:100%;
font: 12px/1.333 "\5FAE\8F6F\96C5\9ED1""Hiragino Sans GB"arial,helvetica,clean;
}
select,
input,
button,
textarea {
font:100% arial,helvetica,clean;
}
table {
font-size: inherit;
font: 100%;
}
/*
* Corrects font family set oddly in IE6S4/5Chrome
* en.wikipedia.org/wiki/User:Davidgothberg/Test59
*/
pre,
code,
kbd,
samp {
font-family: monospaceserif;
_font-family: 'courier new'monospace;
font-size: 100%;
line-height: 100%;
}
small {
font-size: 75%;
}
.clearfix::after {
content: "";
display: block;
height: 0;
visibility: hidden;
clear: both;
}
>
设备振动要求
设备振动要求指的是为确保设备正常运行、
保证其性能和可靠性,对设备振动的幅度、频率、稳定性等参数所规
定的标准和限制。
依据
ISO 10816
标准,对于额定功率大于
15kW
且转速在
1000 -
3600r/min
的旋转设备,其振动速度有效值应控制在
2.8mm/s
以内,以
保障设备的平稳运行和减少部件磨损。
对于往复式压缩机,其振动的频率范围通常在
10 - 100Hz
,在这
个频率区间内,振动加速度峰值不应超过
15m/s²,否则可能导致连接
部件松动和管道疲劳损坏。大型电机设备在运行时,其轴向振动位移
不应超过
0.07mm
,径向振动位移不应超过
0.05mm
,这样能避免因振动
过大造成电机轴承过热和绕组绝缘损坏。高精度数控机床的振动要求
更为严格,在加工过程中,其振动频率在
50 - 200Hz
时,振动幅值需
控制在
0.005mm
以内,以保证加工精度和表面质量。风机设备振动的
相位差应保持在一定范围内,一般水平和垂直方向的相位差在
90°±10°,可防止风机因振动相位异常而产生额外的不平衡力。
对于安装在建筑物内的设备,其振动传递到建筑物结构上的振动
加速度不应超过
0.5m/s²,以避免对建筑物结构造成影响和引起人员不
适。泵类设备在启动和停止过程中,其振动的过渡时间应控制在合理
范围,一般启动过渡时间不超过
10s
,停止过渡时间不超过
8s
,防止
因过渡时间过长造成设备内部部件的冲击损坏。航空发动机的振动要
求极高,在额定工况下,其振动加速度有效值应小于
2g
(
g
为重力加
速度),以确保飞行安全和发动机的可靠性。印刷设备在工作时,其