【正文】 a radial bearing at a frequency response of the vibration amplitude of the vibration amplitude of the radial bearing at the node 4484 frequency response curve shift increased amplitude in a The natural frequencies at the minimum, followed by the natural frequency of the secondorder, thirdorder natural Grinder Spindle structure parameters are as follows: rotor protection before and after bearing clearance the front and rear radial bearing clearance of from Table 3, when the frequency of the excitation force to the rotororder, thirdorder natural frequency, the resonance generated by the rotor displacement in the transfer curve in the finite element model, respectively corresponding to the nodes 7746, 7818, 7559 and 4484, the amplitude of vibration frequency nodes in the Y direction of the dangerous section of the displacement shown in Table the frequency of the excitation force is reached when the natural frequency of the rotor, the rotor displacement(vibration amplitude)will suddenly increases, frequency response curve of the web through the first three can be seen, within the scope of the clearance of the rotor charts。grinder electric spindle。(2)在施加了磨削激振力后，通過幅值頻率響應分析確定了幾個危險界面的節(jié)點位移，可初步判斷主軸系統(tǒng)的穩(wěn)定性。結(jié)論(1)完全彈性支承下，電主軸轉(zhuǎn)子固有頻率的總體變化趨勢隨支承剛度的增大而增大，并且在支承剛度較低時，固有頻率隨支承剛度的變化較大。由轉(zhuǎn)子的二階振型可以看出，轉(zhuǎn)子在后保護軸承處的徑向位移小于后徑向軸承處的徑向位移，故可判定后保護軸承處在Y 方向的位移小于 X 10 一7 m。當激振力頻率達到轉(zhuǎn)子的固有頻率時，轉(zhuǎn)子的位移(振動幅值)會突然增大，通過前三階的幅頻響應曲線可以看出，轉(zhuǎn)子位子間隙范圍之內(nèi)。由表3 可知，當激振力頻率達到轉(zhuǎn)子一階、三階固有頻率時，轉(zhuǎn)子產(chǎn)生的共振位移在轉(zhuǎn)曲線，在有限元模型上分別對應節(jié)點7747817559 和4484 的振動幅值頻率響應。圖7~ 圖10 分別為砂輪、前保護軸承、前徑向軸承和后徑向軸承處的振動幅值一頻率響應后徑向軸承處節(jié)點4484 振動幅值一頻率響應曲線移增大幅值在一階固有頻率處最小，二階固有頻率處最大，三階固有頻率處次之。COMBIN14 7 N/m，為分析轉(zhuǎn)子在高頻段的響應，將激振力的頻率范圍擴大至0~1600Hz，分20 個載荷步進行諧響應分析?？梢缘玫睫D(zhuǎn)軸前四階固有頻率隨剛度變化曲線,轉(zhuǎn)子的正進動固有頻率隨支承剛度的增大而增大，且轉(zhuǎn)子的低階固有頻率隨支承剛度增加的幅度較大。止推盤兩側(cè)分別采用8 個彈簧轉(zhuǎn)軸 根據(jù)轉(zhuǎn)子的結(jié)構(gòu)形式，用ANSYS 建立起轉(zhuǎn)子的實體有限元分析模型，模態(tài)分析支承剛度對轉(zhuǎn)子固有頻率的影晌根據(jù)轉(zhuǎn)子的有限元分析模型，用ANSYS 對其進行模態(tài)分析[5J。，總長507mm，軸向軸承 。本文以某電磁軸承支承的磨床電主軸為研究對象，建立了轉(zhuǎn)子的彈性支承模型，對其進行了模態(tài)分析和施加磨削力時的穩(wěn)態(tài)響應特性分析。轉(zhuǎn)子的動態(tài)特性是電磁軸承支承特性與轉(zhuǎn)子結(jié)構(gòu)動力學特性綜合作用的結(jié)果。穩(wěn)態(tài)響應特性 引言電磁軸承具有無摩擦、元磨損、高速度、高精度及可長期免維護等優(yōu)點，因此被廣泛應用于高速旋轉(zhuǎn)類機械中。磨床電主軸。對施加磨削力時轉(zhuǎn)子的穩(wěn)態(tài)響應特性進行了分析，根據(jù)危險界面的節(jié)點位移，初步確定了主軸系統(tǒng)的穩(wěn)定性。我希望我能從事PCB方面的工作，我會努力工作，謝謝你給我這個機會談談這些，我說完了，謝謝。我已經(jīng)通過大學英語四級考試和全國計算機等級考試 C 二級。同時，我也很能承受工作壓力。我的專業(yè)是機械工程及自動化。我相信我能成功。m a good team player and I39。第一篇：有關(guān)機械專業(yè)的英語自我介紹Good afternoon!It is really my honor to have this opportunity for an interview,I hope i can make a good performance 39。m confident that I can i will introduce myself brieflyMy name is XXX,I am 22 years am from guangxi will be graduated from Guangxi university of major is Mechanical Engineering and think I39。m a