【正文】 潮流，滿足社會(huì)對(duì)我們的要求，學(xué)習(xí)并不是一朝一夕就能夠取得非凡成就的，在今后的道路上我們也應(yīng)該樹立終身學(xué)習(xí)的觀念，保持謙虛謹(jǐn)慎，不驕不躁的風(fēng)格勇往直前開拓屬于自己的新天地、實(shí)現(xiàn)自己的中國(guó)夢(mèng)，路漫漫其修遠(yuǎn)兮，吾將上下而求索！參考文獻(xiàn)[1] Joseph Definitive Guide to the ARM CortexM3 [M].Singapore,Elsevier Pte Ltd. 2007[2] Kim. A theoretical model for the evaluation of measurement uncertainty of a sound level meter calibration by parison method in an anechoic room [J]. 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One key ponent of an SPM is its coarse approach positioner which brings the tip and sample as close as in nanometer range and is many times a piezoelectric –11 The piezomotor has nevertheless other is the important applications such as mirror positioning in modern optics12 and cell or DNA to now, there are many kinds of piezomotors found in literatures including look Inchworm,3,14–19 beetle type,5–7,10,20–22 shear piezostepper,2,8,9,11,23,24 and inertial slider,4,25–28 , they all have severe drawbacks. For the ?rst three types, each needs other more an three or more piezoelectric actuators to operate, which is too plicated in both structure and control. Their is the other reliability and applications in small space(extreme condition environments)and weak signal measurements all bee severe issues. Inertial slider is rather simple, but not very rigid(prone to vibration, thus downgrading the quality of atomic images)and unable to produce enough pushing force. In this paper, we demonstrate a piezoelectric motor that does not have the above limitations. It is implemented by a single piezoelectric scanner tube(PST) that axially and deeply cut into almost two halves and grips a hollow a shaft(HS)inside from both ends by the spring parts of the driving voltages on that separately deform the two halves of the PST in one direction and concurrently recover will move the HS one step in the opposite direction, and vice versa. Its pactness, simplicity, rigidity, and large size make it particularly useful in small space(extreme conditions)temperature applications.II. DESIGN AND PRINCIPLEFigure 1 shows the schematic of our design. A photo of the actual setup is given in Fig. 2. Two sapphire rings of thick by and mm inner versus outer diameters are glued(with H74F epoxy from Epoxy Technology)the fourquadrant PST(model of Physik Instrumente, 30 mm long by 10 mm outer diameter by wall thickness with 177。(4)the smallest gap between the square HS and the sapphire rings is easier to tweak by grinding(smaller gap will lead to a larger travel range). schematic diagram for deriving the range of motion.Apparently, the clamping forces N1,N2,and Nbr do not remain constant when the HS moves, thus limiting its range of range of motion for the square HS can be derived as follows. Referring to in which FS is the force produced by the spring and LB and LC stand for the distances from the spring to the base ring and to the clamping semi rings, respectively, the lever law leads to:LB(LC+LB).Because N1=N2 and we need N1+N2Nbr for the HS to walk, this means that LBLC should be satis?ed. Since the HS cannot move if LC=0, the range of motion is ?nally determined by 0LCLB. In our design, LC+LB≈30mm(the length of the PST), we expect that maximum displacement of the square HS is less than 15 mm. This issue of limitation on the range of motion can nevertheless be solved if the clamping springs are attached to the sapphire rings(not to the HS).III. PERFORMANCE TEST We have tested the room temperature performance of the motor in two extreme cases of moving directions(upward and downward)by measuring its step size and speed as functions of the frequency [Figs. 5(a)and 6(a)for circular and square HS, respectively]and operating voltage[(b)and 6(b)for circular and square HS, respectively]. The pressing forces were set to N1≈N2≈Nbr≈ for circular HS which are much smaller than the blocking forces (Fbl1～Fbl2～2N)of the driving piezoP1 and P2. The maximum step size is m with the measurement conditions being: circular HS, downward stepping with Hz driving frequency. When the moving direction is changed to upward, the step size bees m due to gravity. In case of square HS, the downward and upward step sizes are and , respectively, which is more uniform because of its knife edge contacts with the sapphire rings. All these step sizes are rather large pared with other types of piezoelectrimotors9,11,23 with the similar speed of motion is of course closely related to the driving frequency. The maximum driving frequency we set was 50 Hz, at which the speeds for the circular(upward versus downward) and square(upward versus downward)HS were:( versus )and( versus )mm/min.When the driving frequency , is increases or if the magnitude of the operating voltage drops, the step size diminishes as very a seen in Figs. 5 and 6. Although we get larger step size from circular HS, we still prefer look the square HS owing to its advantages listed earlier. For instance, the look is travel range using the square HS is 9 mm(as designed)pared with mm for the circular HS(worse than the designed travel range).The performance curves of the square HS motor seen in are also smoother and more consistent than those ()of the circular HS motor. step size(left vertical axis)nd speed(right vertical axis of the motor using the circular HS as functions of (a) frequency(max