Journal of Scientific Instruments Editor: Dr H R Lang Vol 28 and Supplement No 1, 1951 Pp xvi + 388 + iii + 80 (London: Institute of Physics, 1951) Bound, £3 12s; unbound, £3

/pdf/a-review-of-scientific-instruments-50cfd4j98s.pdf

A Review of Scientific Instruments

Mechatronics Technology is a growing career field that deals with the integration of mechanical and electronic components managed by control systems. Mechatronics technicians troubleshoot, maintain and repair mechanical equipment controlled by electrical, electronic and computer systems. These types of systems are increasingly used in a wide variety of manufacturing and industrial settings. Clark College's Mechatronics Technology (MTX) classes emphasize current concepts and technology by providing practical, hands-on experiences with the latest, industry standard equipment. In addition to the technical knowhow needed to maintain and repair equipment, the certificate and degree programs will help prepare students to think critically, function as a successful team member and communicate clearly too internal and external customers.

Mechatronics기술개발 현황과 과제

Recent trends in piezoelectric actuators for precision motion and their applications: a review

Precision positioning systems with large working stroke (millimeter or more) and micro/nano-scale positioning resolution are widely required in both scientific research and industries. For this kind of applications, piezoelectric materials based actuators show unique advantages and have been widely employed. To overcome the demerit of the limited working stroke for single piezoelectric element, various stepping motion principles have been proposed in the past years, and accordingly, stepping piezoelectric actuators with various structures have been designed and evaluated. This review is aimed to summarize the recent developments and achievements in stepping piezoelectric actuators with large working stroke. Especially, the emphasis is on three main types of stepping piezoelectric actuators, i.e., inchworm type, friction-inertia type, and parasitic type. The motion principles of these three types of piezoelectric actuators and the corresponding developments of various actuators are discussed respectively, followed by pointing out the existing problems in these three types of piezoelectric actuators and proposing some potential research directions in this topic. It is expected that this review is helpful for relevant researchers to understand stepping motion principles as well as piezoelectric actuators, and to successfully select and design stepping piezoelectric actuators for specific applications.

Stepping piezoelectric actuators with large working stroke for nano-positioning systems: A review

A trapezoid-type stick–slip piezoelectric linear actuator using a right circular flexure hinge mechanism was proposed, designed, fabricated, and tested with the aim of accomplishing linear driving based on stick–slip motion. The angle adjustment of the trapezoid beam was used for generating lateral motion on the driving foot of the flexure hinge mechanism. A method of tuning the lateral motion of the flexure hinge mechanism was discussed. Based on the finite-element method, a proper angle of the trapezoid beam was obtained. The analysis results proved that asymmetrical flexure hinge mechanism can increase static friction force in slow extension stage and decrease kinetic friction force in quick contraction stage by lateral motion of the driving foot. A prototype was fabricated and its experimental system was established. The mechanical output experiments showed that the prototype achieved maximum output velocity and load of 5.96 mm/s and 3 N at a voltage of 100 V $p-p$ and a frequency of 500 Hz, respectively.

A Novel Trapezoid-Type Stick–Slip Piezoelectric Linear Actuator Using Right Circular Flexure Hinge Mechanism

Influences of sequential cuts on micro-cutting process studied by smooth particle hydrodynamic (SPH)

In this paper, a tension stress loading unit is designed to provide tension stress for brittle materials by combining the piezo actuator and the flexible hinge. The structure of the tension stress loading unit is analyzed and discussed via the theoretical method and finite element simulations. Effects of holding time, the installed specimen and hysteresis of the piezo actuator on output performances of the tension stress loading unit are studied in detail. An experiment system is established by combing the indentation testing unit and the developed tension stress loading unit to characterize indentation response of single crystal silicon under tension stress. Experiment results indicate that tension stress leads to increasing of indentation displacement for the same inden-tation load of single crystal silicon. This paper provides a new tool for studying indentation response of brittle materials under tension stress.

A tension stress loading unit designed for characterizing indentation response of single crystal silicon under tension stress

The utility model relates to a micro-nano level bionic multi-degree-of-freedom driving device and belongs to the field of precision and ultra-precision machining. The micro-nano level bionic multi-degree-of-freedom driving device mainly comprises a stator, a rotor and an output shaft, wherein a rotary driving mechanism and a linear driving mechanism are connected to the rotor; and the output shaft is a variable interface rotating shaft. According to the micro-nano level bionic multi-degree-of-freedom driving device disclosed by the utility model, a flexible hinge structure is driven by a high-precision piezoelectric actuator for relevant clamping; the stepped ultra-precision rotating motion of the rotor around a fixing shaft is realized by controlling piezoelectric clamping mechanisms in an upper layer and a lower layer of the rotor and a piezoelectric driving mechanism connected onto the lower layer; and meanwhile, the linear stepped movement along the orientation is realized by controlling flexible hinge mechanisms connected onto the upper layer and the lower layer of the rotor. The micro-nano level bionic multi-degree-of-freedom driving device disclosed by the utility model can be applied to the field of high-precision driving and processing and has the advantages of less investment, low cost, quick response and high benefit. The ultra-precision stepped rotating motion around the orientation and the linear stepped motion along the orientation can be realized.

Micro-nano level bionic multi-degree-of-freedom driving device

Measurement results of the output stepping rotary angle of a piezoelectric-driven rotary actuator by means of inchworm motion have been compared with results obtained from three-dimensional Finite Element Analysis (FEA). Comparison results showed a good quantitative agreement, and confirmed the validity and accuracy of the finite element method in the design and analysis of the inchworm-type rotary actuators. In addition, the effect of the gap between the stator and rotor on the working performance of the actuator was investigated by using FEA. With the increase of the gap, both the stepping rotary angle and the output torque of the rotor decrease significantly. Therefore, this factor must be taken into consideration in the design and machining of this kind of actuators.

Quasi-Static Contact Analysis of an Inchworm-Type Piezoelectric-Driven Rotary Actuator via Finite Element Method

In this paper, a novel model combining the microstructure prediction model and a modified constitutive model of the Johnson-Cook (JC) model was developed and embedded into FEM software via the user subroutine. The chip formation and microstructure evolution in high speed cutting of Ti-6Al-4V alloy were simulated based on the presented model. The results indicated that dynamic recrystallization mainly happened in ASBs, where the grain size had a big decline. According to the variation of cutting temperature and grain size of microstructure, the mechanism of the adiabatic shear bands (ASBs) formation was investigated deeply and concluded that dynamic recrystallization was the root cause of the serrated chip formation.

Microstructure Evolution of Ti-6Al-4V Alloy during High Speed Cutting: An Investigation Using Finite Element Simulation

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