| High throughput and precision quantitative distribution is needed during theprocesses of gene extraction, protein crystallization and new drug development projectsand so on, when using a wide variety of biological reagent. There exist shortcomingssuch as labor-intensive, low accuracy and poor repeatability. Though arises at thehistoric moment of single channel automatic feeding sample system in a certain extenthave overcome them, still unable to satisfy the requirements of more and moreoperations on samples. Comparing, the multichannel automatic and sample system hassolved the problems and its advantages are the trend of high throughput processing.The automatic feeding sample system with four channels has a disposal speed of16wells per second, positional precision can reach±0.2mm，distance between theadjacent needle is9mm to18mm. Of all the structures, cantilever affording a heavymass which has a high speed of1m/s is one of the most important parts. The movementof the heavy mass causes a serious problems which is harmful to the Cantilever such asthe effect on Cantilever forehead stiffness，Mechanical vibration and Mechanicalimpedance.Then, after having simplified the cantilever as Euler Bernoulli beam and analysedthe problems mentioned former by application modal analysis theory. Following, theapplication method of optimal design framework maximum rigidity than inertiaoptimized is done followed. The results show that, the dynamic performance of thecantilever beam have improved, to improve the design of the cantilever beam proposedthe theory basis for reference.Finally, a experimental platform which has piezoelectric ceramic sensors is set up.According to the output of piezoelectric ceramic, voltage signal changes image and datawere collected. After having disposed the data collected by cycle method, not only theframe and the composite natural frequency and the stiffness were determined, but alsoanalyzed the causes of errors of the measured value and the theoretical value. |
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