A kind of parametric finite element analysis system for the L type gantry crane’s gate frame is developed by making use of the secondary development on the platform of ANSYS, MATLAB through VC++ programming. The interface technology of VC++, ANSYS, and MATLAB is employed as well as the encapsulation on APDL. To input parameter in the VC++ and to calculate the quality of the L type gantry crane ...

In shipbuilding gantry cranes in long-term service the coastal humid salt-spray environment, main beam is affected many places by corrosion fatigue-formed pits, affecting structural strength of beam. This paper focuses on impact corrosion-generated pits under conditions crack nucleation. Corrosion fatigue nucleation a local damage evolution process and stress intensity factor criterion one crit...

Imaging plays a vital role in radiation therapy and with recent advances in technology considerable emphasis has been placed on cone-beam CT (CBCT). Attaching a kV x-ray source and flat panel detector directly to the linear accelerator gantry has enabled progress in target localization techniques, which can include daily CBCT set-up scans for some treatments. However, with an increasing number ...

The use of solid carbon fiber table materials in radiotherapy has become more common with the implementation of image-guided radiotherapy (IGRT), since the solid materials give less imaging artifacts than the so-called tennis racket couchtops. The downside of the solid carbon fiber couch inserts is that they increase the beam attenuation, resulting in increased surface doses and inaccuracies in...

External beam radiation therapy (EBRT) is considered to be one of the options to treat the prostate cancer. Due to advanced development in EBRT such as volumetric modulated arc therapy (VMAT) and intensity modulated radiation therapy (IMRT), it is possible to deliver conformal dose to the target while minimizing dose to the organs at risk (OAR). The VMAT can deliver modulated radiation beam wit...

Problem statement: Most of the common gantry crane results in a sway motion when transporting the load as fast as possible. In addition, precise cart position control of gantry crane must required a zero or near zero residual sway. Approach: In this study, the development of hybrid control schemes for input tracking and anti-sway control of a gantry crane system was investigated. To study the e...

This study is to investigate three common potential setup uncertainties during Linac commissioning and annual QA and to evaluate how these uncertainties propagate into the quality of beam profiles and patient dosimetry using gamma analysis. Three uncertainty scenarios were purposely introduced for gantry position tilted from 0 ̊ 3 ̊ (scenario 1), isocenter position misaligned from 0 6 mm (scenari...

Kinetic parameters are commonly estimated from dynamically acquired nuclear medicine data by first reconstructing a dynamic sequence of images and subsequently fitting the parameters to time-activity curves generated from regions of interest overlaid upon the image sequence. Biased estimates can result from images reconstructed using inconsistent projections of a time-varying distribution of ra...

Design and Remote Control of a Gantry Mechanism for the SCARA Robot. (August 2007) Surinder Pal, B.Tech., Indian Institute of Technology, Bombay Chair of Advisory Committee: Dr. Sheng-Jen "Tony" Hsieh Remote experimentation and control have led researchers to develop new technologies as well as implement existing techniques. The multidisciplinary nature of research in electromechanical systems ...

This paper investigates the design of composite nonlinear feedback (CNF) control law for an underactuated gantry crane system to achieve positioning and anti-swing control. First, the dynamic model of a nonlinear underactuated gantry crane system is established by using the Euler-Lagrange modeling method. Then, the CNF control law is designed for the system to improve the anti-swing performance...