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# 關於機械工程 中翻英 "伸張效應、波動傳導" 20點 急

不好意思又麻煩大家了!!! 請懂理工又懂機械的達人幫忙一下! 小弟不才 雖然英文還不錯但要翻譯這麼深奧的實在不堪負荷~老闆又......請大家幫幫忙! 拜託不要用翻譯軟體，老闆看得懂滴!!!

在超音波馬達或致動器的發展歷史中，由於結構形態發展的變異性太大且存在許多難以預測的非線性因子，諸如伸張效應、波動傳導、機電能量轉換、材料非均向性、遲滯、背隙、能量散逸(熱損失)、接觸磨耗、溫升等非線性時變的物理變異量，致使系統在數學的描述與推導上遭遇相當的困難。為了能有效地解析出系統本身有關結構受力形變、及振動動態行為等問題，往往會做某些特別的假設以簡化原始系統成為線性之系統，或針對原始系統在欲分析的局部範圍內做非線性系統的線性化，如此方可利用數學上的常微分方程式或偏微分方程式等來描述並加以求解；而其中之邊界條件、初始條件的設定及材料均質的假設亦常是在基於能求出一可解析解的情形下所配合給定，其並無法有效地反映出實際問題之真實面。這種以簡化、假設的近似解析方式對於較為簡單的工程問題或系統而言，也許並不會有太大的誤差形成(仍具有相當程度的正確性)，但對於大多數複雜、不規則、非線性、及難以被數學化的實際系統而言，利用傳統的解析方法將難以求得較為正確、精準的真實解，且常導致有不正確之解答產生。

由圖5(a)至(h)所顯示的一系列ANSYS動態模擬圖中，可歸結出下列重要結論：壓電蜂鳴片三相對稱結構及三螺釘至正圓心不等距離之設計，確實使三相對稱薄盤式超音波致動器之轉軸驅動點周圍產生三相交替之行進波、且其持續改變，如此將形成一環繞轉軸驅動點的旋轉運動力，可推動其上之轉軸旋轉。

### 2 Answers

- 1 decade agoFavorite Answer
In the development history of ultrasonic

motor or actuator, because of the large variation in developing the

structure-shape and many nonlinear factors which are hardly to predict, such as

the tensile effect, wave conduction, electro-mechanical exchange,

non-uniformity of material, arrearage, back-gap, energy dissipation (heat

loss), contact abrasion, temperature increase, which are non-linear

time-variation physical variables, so we suffer many difficulties in doing the

mathematical description and derivation on the systems. To effectively analyze

problems of the structure deformation by external force and the dynamic

vibration behavior on the system, usually some special assumption are

established to simplify original system to become linear system, so that the

mathematical ODE or PDE could be used to describe and find the solution. And

the parameter setting of the boundary condition and the initial condition and

the assumption of material uniformity are often given and based on a special

condition that the analytical solution could be found. Its result could not

effectively reflect the true situation of real problem. For some simple

engineer issues or systems, maybe there is not too much inaccuracy generated by

this approximate solution of simplified assumption (At certain level, it may

have the accuracy.) But for most real systems that are complicated, un-regular,

and difficult to be described by mathematics, the usage of traditional

analytical method will hardly find the actual and accurate solution, and often

lead to in-correct solution.

In the dynamic simulation graph shown in

figure 5 (a) to (h), we have following important conclusions: The design of

three-phase symmetrical structure and un-equal distance from the three screws

to circle will actually generate a three alternatively progressing wave around

the shaft driven point of the ultrasonic actuator.

2010-05-06 19:37:59 補充：

在意見中。

2010-05-06 19:38:12 補充：

And the consistent change of the three phases will form a spin force surround the rotation shaft, and finally they drive the rotation shaft to rotate.

Source(s): 自己 - 鬼才刺藝工作室Lv 51 decade ago
第一段

In supersonic wave motor or in actuating unit's historical development, because structure shape development changeability and has the misalignment factor which too greatly many forecast with difficulty, such as promotes the effect, the fluctuation conduction, the mechanical and electrical energy conversion, material non-even tropism, sluggish, the back crack, the energy dissipation (heat los), the contact abrasion, the temperature rise and so on misalignment time-variable physics amounts of variation, the cause system in mathematics description and the inferential reasoning the bitter experience suitable difficulty. For can analyze the system itself related structure stress deformation effectively, and questions and so on vibration dynamic behavior, often will make certain special suppositions to simplify the primal system to become system of the linear, or will aim at the primal system in the partial scope which will want to analyze to make nonlinear system's linearization, so only then and so on will describe using mathematics in often differential equation or the partial differential equations and solves; But boundary condition, initial condition's hypothesis and the material isotropic supposition also often are in based on can extract one may under the analytic solution situation coordinate to assign, its and is unable to reflect the actual problem effectively the real surface. This kind simplifies, the supposition approximate analysis way speaking of the simpler project question or the system, perhaps will not have the too big error to form (still had suitable degree accuracy), but speaking of majority complex, anomalous, the misalignment, and with difficulty by the mathematization actual system, will obtain correctly, the accurate real solution with difficulty using the traditional analysis method, and often caused to have not the correct explanation production.

2010-05-06 10:40:41 補充：

我第二段寄給你

Source(s): , 自太多