Anonymous

關於機械工程 中翻英 "伸張效應、波動傳導" 20點 急

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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

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