Abstract: In this paper a three dimensional non-linear model has been derived to describe the dynamics of an unstable moment exchange unicycle robot. The robot uses a driving wheel to provide stabilization in longitudinal direction, while a second moment exchange wheel with a large inertia is used for stabilization in lateral direction. For validation purposes, the resulting equations of motion...

The turbine rotor is the key component of turbine, which has a great impact on construction cost and power generation efficiency an entire hydropower station. Receiving torque runner transmission completing specified its main function. There are many uncertain factors in design, manufacture, operation environment rotor. Therefore, it necessary to optimize mechanism premise ensuring that mechani...

Three dimensioned finite element analysis were conducted on concrete block paving. In order to verify the calculated results, an experimental case study was analyzed. Good agreement was observed between the measured and the calculated results. Based on the finite element analysis results and available failure models, comprehensive design charts were developed for port and industrial pavement wh...

A novel pure rotary actuator with a double-layer flexible mechanism (RA-DFM), which is driven by single piezoelectric ceramic in the lower and generates rotational motion upper mechanism, proposed this paper. The output of successively amplified using an enhanced double Scott–Russell two lever-type mechanisms to obtain large rotation range. static, kinematic dynamic properties RA-DFM are numeri...

A new piezoelectric-based mechanism was proposed, modeled and tested. This mechanism was basically designed to be periodically excited while in contact with a driven surface. Two piezoelectric elements located by the angle of 901 relative to each other are used to create elliptical motion on tip of the mechanism depending on the applied phase difference. In order to ensure the designated ellipt...

In ultrasonic tube hydroforming, the tube is hydro formed while the ultrasonic vibration is applied to the die. Prior studies provide experimental proof that ultrasonic tube hydroforming reduces corner radius, improves lubrication and uniform thickness. Use of ultrasonic vibration can decrease friction at the tube-die interface. Few attempts have been made to analyze the wire drawing while the ...

background: the aim of this work was to study the feasibility of constructing a fast thorax model suitable for simulating lung motion due to respiration using only one ct dataset. materials and methods: for each of six patients with different thorax sizes, two sets of ct images were obtained in single-breath-hold inhale and exhale stages in the supine position. the ct images were then analyzed ...

With the development of nanotechnology, micro/nanorobots (MNRs) have become promising medical tools given their advantages unconstrained and precisely controlled navigation. However, complexity MNRs’ dynamic biological environments limitations current experimental methods, it remains challenging to simulate motion mechanism, functional implementation strategy, adaptability MNRs in environments....

in design of defense structures, concrete are often used to provide protection against incidental dynamic loadings such as the impact of a steel projectile. in the present study, a new analytical model is proposed to predict penetration depth into concrete targets by ogive nose projectile. hence, to ­ develop the model and simulate penetration of high velocity ogive-shape nose steel projectiles...