Traveling Wave Ultrasonic Motor (TWUM) is a compact, precise, and silent actuator generating high torque at low speed without gears. Moreover, the TWUM has a high holding torque without supply, which makes this motor as an attractive solution for holding position of robotic arms. However, their nonlinear dynamics, and the presence of load-dependent dead zones often limit their use. Those issues...

Before a product can be developed, materials are the first step in the differentiation and engineering of matter. Therefore material constitutes the clay with which any human made product is built. Since the drawn of time, man has been using materials, but knowledge in this area is mainly based in experience. Today we have reached a revolutionary stage in the knowledge and the control of matter...

Having good control over the speed and direction of non-contact transportation is critical in industry today, especially areas such as manufacturing flat panel displays, silicon wafers semi-silicon a number other electronic devices. In dual transducer-type ultrasonic levitation-based system, it well known that vibrating plate length wavelength flexural vibration should satisfy strict relationsh...

Nowadays, piezoelectric materials have wide applications in various industries. Therefore, investigation of these materials and their applications has a special importance. In this paper first, the natural frequencies of a traveling-wave piezoelectric motor are achieved, using finite elements simulations. Then, applying an alternative electrical voltage to the piezoelectric ring, a traveling wa...

1. The TPP is of critical importance to Taiwan. Its importance and implications are reflected in three major aspects. First is the economic implication if Taiwan joins (or failed to join) the TPP bandwagon. Second is the implication on domestic reforms, i.e. using TPP as a driving force for Taiwan to undertake reform initiatives. Last but not least is the political implication for Taiwan as a p...

among numerous np-hard problems, the traveling salesman problem (tsp) has been one of the most explored, yet unknown one. even a minor modification changes the problem’s status, calling for a different solution. the generalized traveling salesman problem (gtsp)expands the tsp to a much more complicated form, replacing single nodes with a group or cluster of nodes, where the objective is to fi...

Ultrasonic rotary motors have the potential to meet this NASA need and they are developed as actuators for miniature telerobotic applications. These motors are being adapted for operation at the harsh space environments that include cryogenic temperatures and vacuum and analytical tools for the design of efficient motors are being developed. A hybrid analytical model was developed to address a ...

ultrasonic machining (usm) is a mechanical material removal process used to erode holes and cavities in hard or brittle work pieces by using shaped tools, high-frequency and an abrasive slurry. this paper addresses the concept and development of an expert system (es) for hard and brittle material, such as glass, quartz, diamond, carbides, semi conducting materials, ceramic and graphite which ca...