Development and characterization of a novel piezoelectric-driven stick-slip actuator with anisotropic-friction surfaces

Abstract

Piezoelectric actuators (PEA) hold the most promise for precision positioning applications due to their capability of producing extremely small displacements down to 10 pm (1 pm = 10 -12 m) as well as their high stiffness and force output. The piezoelectric-driven stickslip (PDSS) actuator, working on the friction-inertia concept, has the capacity of accomplishing an unlimited range of motion. It also holds the promises of simple configuration and low cost.On the other hand, the PDSS actuator has a relatively low efficiency and low loading capability, which greatly limits its applications. The purpose of this research is to improve the performance of the PDSS actuators by employing specially-designed working surfaces.The working surfaces, referred as anisotropic friction (AF) surfaces in this study, can provide different friction forces depending on the direction of relative motion of the two surfaces, and are used in this research to accomplish the aforementioned purpose. To fabricate such surfaces, two nanostructure technologies are employed: hot filament chemical vapour deposition (HFCVD) and ion beam etching (IBE). The HFCVD is used to deposit diamond on silicon substrates; and the IBE is used to etch the diamond crystalloid with a certain angle with respect to the coating surface to obtain an unsymmetrical-triangle microstructure.iii A PDSS actuator prototype containing the AF surfaces was developed in this study to verify the function of the AF surfaces and characterize the performance of PDSS actuators. The designed surfaces were mounted on the prototype; and the improvement in performance was characterized by conducting a set of experiments with both the normal isotropic friction (IF) surfaces and the AF surfaces, respectively. The results illustrate that the PDSS actuator with the AF surface has a higher efficiency and improved loading capability compared to the one with the IF surfaces.A model was also developed to represent the displacement of the novel PDSS actuator.The dynamics of the PEA and the platform were approximated by using a second order dynamic system. The pre-sliding friction behaviour involved was investigated by modifying the LuGre

Piezoelectric Inertia Motors—A Critical Review of History, Concepts, Design, Applications, and Perspectives

“…In the investigations by Zhang et al [81], such a surface increases-for equal driving signals-velocity and force for one direction of movement while decreasing the velocity for the other direction, with the force unmentioned. This is thus an option to build an inertia motor with a preferred direction of motion due to a direction-dependent friction coefficient.…”

“…It has been measured using different methods: making the slider move against a spring, the force is either determined from the deformation of the spring [61,74,75], or using a load cell connected to the spring [76,77]. Other authors make the slider move directly against a load cell [67,[78][79][80][81], or the force is exerted to a part connected to a load cell instead of a slider [82]. (Bergander et al [67] (p. 33) and Kang et al [78] (p. 610) only state that they measured the force of the slider "with a precision balance" respectively "using a digital power gauge".…”

“…For similar technical reasons, some authors have used simple driving circuits in which the slow edge of the signal is determined by the discharge curve of a capacitor [164,167,244]. sawtooth without plateau linear rise parabolic rise other rise profile [30,34,36,41,42,55,61,65,76,81,96,97,106,115,116,154,160,163,166,172,186,192,[238][239][240] [ 160,241] [ 104,154,160,[242][243][244] sawtooth with one plateau linear rise parabolic rise other rise profile [47,63,114,157,192,[245][246][247] [ 52,62,110,155,…”

A Linear Piezoelectric Stick-Slip Actuator via Triangular Displacement Amplification Mechanism

“…Zhong et al developed an inertial stick-slip driving platform in combination with a flexible hinge mechanism [33]. Zhang et al studied an anisotropic friction surface to reduce the backward motion [34]. In the previous study, Li et al developed a bidirectional piezoelectric stick-slip actuator based on the principle of flexible hinge lever amplification [35], increasing the displacement of one step and the speed of the slider.…”

Friction predication on pin-to-plate interface of PTFE material and steel

“…However, most of the researches are tied to specific products. For example, the friction on piezoelectricdriven stick-slip actuators was investigated by Zhang et al [8,9] and Liu e al. [11].…”