查询词典 square steel

The effect of tribology factors on bearing vibration is studied experimentally. AR model and WPT are used to processing the normal arid abnormal signals. The results are as follows:1. The vibration of ball bearings is caused by the tribology action of contact pairs of ball and ring races and has the essential of tribo-dynamics. Any factors affecting the tribology characteristics of contact pairs will affect vibration and noise of bearings consequently.2. Vibration characteristics of bearing keep almostly unchanged with the increasing of axial load expecting the increasing of nature frequencies. When radial load increasing with axial load unchanged, nature frequencies keep unchanged but some new vibration peaks appears in the spectrum.3. Vibration amplitudes are damped and nature frequency are enhanced with sufficient lubrication. Vibration and noise of bearings increase obviously and roar can happen and the contact surfaces scratch slightly under insufficient and unclean lubrication state. Bearing will be disabled in a few minutes without any lubrication.4. Bearing vibration is unstable under low speed. With the speed increasing, the vibration become stable and natural frequencies increase slightly but the amplitudes increase apparently.5. Bearing vibration can be excited only by some harmonics ofwaviness without lubrication and by all harmonics with lubrication based on the theoretical analysis.6. The nature frequencies of ball bearings decrease with the increasing sizes. When international clearance increasing, nature frequencies decrease in radial and increase in axial and angular and the amplitudes increase in radial and decrease in axial and angular. When the number of balls increasing, nature frequencies increase and amplitudes decrease. When the pitch diameter increasing, axial nature frequency increase and others nearly keep no change. When outer race groove curvature radius increasing, nature frequencies increase in radial and decrease in axial and angular and amplitudes keep no change in radial and increase in axial and angular. When inner race groove curvature radius increasing, nature frequencies decrease and amplitudes increase.7. The distortion in amplitude and frequency components of bearing vibration signals picked up by the present probe measurement method is founded and right conclusions cannot be achieved by the signals. When accelerometer is rigidly screwed with steel stud onto a flat outer surface of a ball bearing, vibration signal can be got without distortion and the reliability of research on bearing vibration is assured.8. AR model is suitable for large samples of bearing vibration signals, square root of length of samples can be used as the upper limitation of order determination and the FPE order selection criterion is effective. Many advantages of AR spectrum are founded over the classical based on FFT.9. Time-Frequency analysis is necessary for abnormal noise of ball bearings. WPT overcomes the principle shortcomings of STFT and proved to be a best tool to process the abnormal signals.

理论分析和试验研究表明： 1球轴承振动是钢球—滚道接触副中的各种摩擦学作用引起的，具有摩擦动力学的本质，任何对接触副的摩擦学特性有影响的因素都将对球轴承的振动和噪声特性产生影响； 2中心轴向载荷作用下，载荷增大使球轴承的固有振动频率升高，载荷越大同样的载荷增幅引起的频率升幅减小，足够大的中心轴向载荷作用下载荷的变化对球轴承振动的频率特性不会产生明显的影响； 3轴向和径向联合载荷作用下，径向载荷不大时球轴承振动的固有频率基本不变，但是可能引起变刚度激励的非线性振动，出现新的频峰，过大的径向载荷将使部分钢球脱离接触，使球轴承的振动和噪声呈现不稳定状态； 4润滑对球轴承的振动和噪声特性有重要的影响，良好的润滑对振动有明显的抑制作用，润滑不充分时，振动和噪声的水平会有明显增高，一定条件下还会激发接触副中的谐振，发出啸声，造成接触表面的伤害，无润滑干接触时，短时的运转就会损伤接触副表面，使振动和噪声迅速增大，并随时可能引发严重的磨损和卡滞失效；接触副润滑良好时，油膜的"刚化效应"使球轴承振动的固有频率有所提高，润滑剂中含有弥散性污浊时，振动的幅度总体升高，但弥散性污浊不会改变球轴承振动的频率特性；浙江大学博士学位论文：球轴承振动的研究 5低速时，球轴承振动的基本特征呈现不稳定状态，随着转速的提高，球轴承振动的频率特性趋于稳定，固有频率频峰升高； 6理论分析表明，干接触时钢球和滚道表面波纹度的某些谐波分量能激励球轴承的振动，振动的幅值与谐波幅值成正比，实际球轴承中钢球的分布不可能完全均匀，波纹度的激励作用会随时发生；润滑接触的分析表明，波纹度的任意谐波分量均能激励球轴承的振动； 7球轴承的几何和结构参数分析表明，球轴承尺寸越大，径向、轴向和角振动的固有频率越低；钢球中心圆直径增大，球轴承的径向和轴向振动的固有频率基本不变，角振动的固有频率有所上升，振动的幅频特性基本不变；径向游隙加大使球轴承的径向振动固有频率降低，轴向和角振动的固有频率有所升高，径向振动幅频特性的幅值升高，而轴向和角向降低；钢球的数量增多使球轴承振动的固有频率上升，幅频特性的幅值下降，径向振动的幅值下降最为明显；外圈沟曲率半径系数增大使球轴承径向振动的固有频率升高，轴向和角振动的固有频率降低，径向幅频特性基本不变，轴向和角向幅频特性幅值升高；内圈沟曲率半径系数增大使径向、轴向和角振动固有频率均下降，振动幅频特性的幅值均有升高； 8试验对比表明，传感器采用探针式安装时，由于探针接触副接触特性的影响，钡(量得到的球轴承振动信号有失真，采用专门设计和制作的试验球轴承，以固定式安装加速度计，首次测量得到了球轴承振动的真实信号，通过对振动信号的分析，验证了球轴承振动的理论模型； 9)基于时间序列分析的AR模型适用于大样本球轴承振动信号的分析，以样本长度的均方根值作定阶上界，FPE做判阶准则，给出的AR谱光滑，频率分辨率高，是球轴承振动分析的简便而可靠的手段； 10以时频域分析的小波包变换分析球轴承异音信号能够比较好地定位和聚焦异音发生的时间，时间间隔，频率范围，同样是球轴承振动分析的可靠的手段，可用作球轴承故障诊断技术。

Answer: The area of the steel plate is about 17 decimeter square.

答：它的面积约是17平方米。

The Zhejiang Province Rui'an cloud reached the vehicle part Limited company to found in 1984, was the domestic and foreign customers provides the vehicle to use the fastener, the stainless steel fastener, the electronic miniature fastener, the high strength fastener, the non-sign fastener, the pressing part, the stopping nut, the welding square nut, the round nut, brought the pad assembling bolt, the bolt, GB code, the German sign elastic ring, the electric appliance to use the inside and outside denticle gasket, the cylindrical pin.

浙江省瑞安云达车部件有限公司创建于1984年，为国内外客户提供车用紧固件，不锈钢紧固件，电子微型紧固件，高强度紧固件，非标紧固件，冲压件，锁紧螺母，焊接方螺母，圆螺母，带垫组合螺栓、螺钉，国标、德标挡圈，电器用内外锯齿垫圈，圆柱销、。

The Zhejiang Province Rui＇an cloud reached the vehicle part Limited company to found in 1984, was the domestic and foreign customers provides the vehicle to use the fastener, the stainless steel fastener, the electronic miniature fastener, the high strength fastener, the non-sign fastener, the pressing part, the stopping nut, the welding square nut, the round nut, brought the pad assembling bolt, the bolt, GB code, the German sign elastic ring, the electric appliance to use the inside and outside denticle gasket, the cylindrical pin.

您是本站第506位访客。浙江省瑞安云达车部件有限公司创建于1984年，为国内外客户提供车用紧固件，不锈钢紧固件，电子微型紧固件，高强度紧固件，非标紧固件，冲压件，锁紧螺母，焊接方螺母，圆螺母，带垫组合螺栓、螺钉，国标、德标挡圈，电器用内外锯齿垫圈，圆柱销、。

Straightedge rule (square rule, slide gauge, inside and outsidemicrometer, steel tape, feeler, dial gauge, depth micrometer, wire gage,radius gage, thread pitch gage) is a kind of common measuring tool.

直尺（角尺、游标卡尺、内径和外径千分尺、钢卷尺、塞尺、千分表、深度千分尺、线规、半径规、螺距规）是一种常用量具。

Straightedge rule(square rule,slide gauge,inside and outside micrometer,steel tape,feeler,dial gauge,depth micrometer,wire gage,radius gage,thread pitch gage)is akind of common measuring tool.

直尺(角尺、游标卡尺、内径和外径千分尺、钢卷尺、塞尺、千分表、深度千分尺、线规、半径规、螺距规)是一种常用量具。

I plant mainly produces all kinds of stainless steel products, nylon kitchen utensils, kitchen supplies, small kitchen includes bottle opener, can opener powerful, butter knives, bread knives, all kinds of melon fruit planing planing, planing lemon, ginger plane, Ichthyosis planing, fruit knife, cheese plane, sub-ballast garlic juice, and pistachios, and ice-cream spoons, fruit spoons, square shovel, backhoe leaking eggs, tablespoon, shell pasta, PIZZA CUTTER, eggbeater, a variety Kitchen shears.

我工厂主要生产各式，不锈钢制品，尼龙厨具，厨房用品，小厨具类包括开瓶器、强力开罐器、牛油刀、面包刀、各式瓜刨果刨、柠檬刨、姜丝刨、鱼鳞刨、水果刀、芝士刨、蒜子压汁器、开心果器、雪糕匙、水果匙、方铲、漏蛋铲、汤勺、意粉壳、PIZZA CUTTER、打蛋器、各式厨房剪。

The company mainly produces: a variety of welded wire mesh models, oversized silk, ultra-wide heavy-duty welded wire mesh, stainless steel welded wire mesh, plastic welded wire mesh, plastic hexagonal, galvanized square nets, gill rope, Ginning net, hook and all kinds of flowers network of metal screens and silk screen products, and other series, the company's products have been widely used in petroleum and chemical industry, construction, medicine, aviation, highways, railways, machinery, electronics, textiles, coal, Culture and many other fields, but also in accordance with the requirements of customers, build different specifications of the metal wire mesh products.

本公司主要生产：各种规格型号的电焊网、超大丝号、超宽幅重型电焊网、不锈钢电焊网、涂塑电焊网、涂塑六角网、镀锌方眼网、刺绳、轧花网、勾花网及各种窗纱和金属丝等系列丝网产品，本公司产品已被广泛用于石油和化工、建筑、医药、航空、公路、铁路、机械、电子、纺织、煤炭、养殖等许多领域，还可以根据客户的要求，订做不同规格的金属丝网产品。

This hexagonal block house built of steel-reinforced concrete occupies a land of ten square meters.

这个六边形的钢筋水泥建成的碉堡占地面积10平方米。

Including Shanghai Volkswagen, General Motors Corporation, Shanghai Zhengda commercial Square, Harbour Gardens Limited, Japan Dongyang precision manufacturing Ltd, Japan Metals Limited, the United States APW Communications Company, the Shanghai Baoshan Iron and Steel Rail operations center Limited, Shanghai Railway Bureau printing, Shanghai Rose, Bolinge Yin Georgia han profession, Shanghai Siemens Ltd, Shanghai Beiling, Shanghai Hongli Semiconductor Limited, Songjiang fixed electricity, Zhangjiang sets of Hong Kong and so on.

其中有上海大众、通用汽车有限公司，上海正大商业广场、汤臣海景花园、日本东阳精密制造有限公司、日本有色金属有限公司、美国APW通讯公司、上海宝钢彩印铁中心有限公司、上海铁路局印刷厂、上海罗氏、勃林格殷格翰药业、上海西门子有限公司、上海贝岭、上海宏力半导体有限公司、松江台基电、张江集电港等等。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。