To improve the jet performance of a bi-piezoelectric jet dispenser, mathematical and simulation models were established according to the operating principle. In order to improve the accuracy and reliability of the simulation calculation, a viscosity model of the fluid was fitted to a fifth-order function with shear rate based on rheological test data, and the needle displacement model was fitted to a nine-order function with time based on real-time displacement test data. The results show that jet performance is related to the diameter of the nozzle outlet and the cone angle of the nozzle, and the impacts of the flow channel structure were confirmed. The approach of numerical simulation is confirmed by the testing results of droplet volume. It will provide a reliable simulation platform for mechanical collision-based jet dispensing and a theoretical basis for micro jet valve design and improvement.

Diamond amplifiers have been widely applied in Nano actuators and Robots. In order to study the dynamic characteristics of the diamond amplifier system which is used in the piezo jet dispenser, it is simplified as a spring-mass-damper system. The dynamic characteristics of the jet dispenser system are analyzed with the simplified method. The characteristics are also tested. The results agree with the simulation, which proves the method is feasible. It will provide a simplified and intuitive representation of the movement of the amplifier, and also provide reliable simulation and experimental platforms for jet dispensing analysis.

The eigenfrequency of a resonator plays a significant role in the operation of a cylindrical shell vibrating gyroscope, and trimming is aimed at eliminating the frequency split that is the difference of eigenfrequency between two work modes. In this paper, the effects on eigenfrequency under resonator-top trimming methods that trim the top of the resonator wall are investigated by simulation and experiments. Simulation results show that the eigenfrequency of the trimmed mode increases in the holes-trimming method, whereas it decreases in the grooves-trimming method. At the same time, the untrimmed modes decrease in both holes-trimming and grooves-trimming methods. Moreover, grooves-trimming is more efficient than holes-trimming, which indicates that grooves-trimming can be a primary trimming method, and holes-trimming can be a precision trimming method. The rigidity condition after grooves-trimming is also studied to explain the variation of eigenfrequency. A femtosecond laser is employed in the resonator trimming experiment by the precise ablation of the material. Experimental results are in agreement with the simulation results.

In order to tackle jet motion interference between a needle and guiding part, a new piezoelectric jet dispenser based on the rhombus magnifying principle is proposed. The new jet dispenser can jet 1.4-Pa · s adhesive without preheating, which can deliver 100 adhesive dots per second. The lifespan of the nozzle and needle exceeds 20 million cycles. It will provide a new device for adhesive distribution, and the amplifying method also fits other piezoelectric applications.

Structural parameters of the jet-dispenser are the important factor of fluid jetting dispensing technology, them have important effect to the volume and velocity of the fluid that jetting from the nozzle outlet. This paper aim to the structural parameters of the jet-dispenser-the diameter of the nozzle and the gap between the ball-needle and the wall, through the calculation formulas of fluid cumulative volume and fluid mean flow velocity, according to MATLAB program computed cumulative fluid volume and fluid mean flow velocity under the condition of different structural parameters. The influence regularity of the diameter of the nozzle and the gap between the ball-needle and the wall are obtained preliminary, for the design and adjustment offers a certain foundation. The results show a good change characteristic of the fluid cumulative volume and fluid mean flow velocity, both of them decreases when the diameter of the nozzle gets small; but them increases when the gap between the ball-needle and wall gets small.