200 research outputs found
Study on the development of a fuzzy logic control electromagnetic actuated CVT system
This paper conducts the preliminary research of an
Electromagnetic Actuated Continuously Variable Transmission
(EMA-CVT) system of quarter scale. An EMA-CVT system is
consisted of two pairs of electromagnetic actuators (solenoid)attached with primary and secondary pulley in order to develop the attraction and repulsive forces. The relationships between the speed ratio and electromagnetic actuation and clamping force and output torque of the CVT are established based on the kinematics of the EMA-CVT system. This study also focused on fuzzy logic based controller (FLC) to precise control for pushing and pulling the sheaves based on the feedback of the RPM sensor and slope sensor. The EMA-CVT performance with controller is
28% more than that of the EMA-CVT without controller. The
solenoids of the EMA were activated by varying the current
supply with the Fuzzy-Proportional-Derivative-Integrator (FPID)to maintain the non-linearity of the CVT in response of the vehicle traction torque demand. Result shows that the solenoid able to pull the plunger in the desired distance with supply current of 12.5 amp while push the plunger to the desired distance with 14.00 amp current supply to the windings when the vehicle is considered in 10% grad. The acceleration time of the ¼ scale car has been recorded as 5.5 s with the response of drive wheels torque
Study on the development of a fuzzy logic control electromagnetic actuated CVT system
Electromagnetic actuated continuously variable transmission (EMA-CVT) system
consists of two pairs of electromagnetic actuators (solenoid) attached with primary and secondary
pulley in order to develop the attraction and repulsive forces. Kinematics of EMA is established
for electromagnetic actuation and clamping force. This study also focused on fuzzy logic based
controller (FLC) to precisely control for pushing and pulling the sheaves. The EMA-CVT
performance with controller is 28% more than that of without controller. The solenoids of the
EMA were activated by varying the current supply with the (FPID) to maintain the non-linearity
of the EMA in response of the vehicle traction torque demand. Result shows that 12.5 amp and
14.00 amp current supply is needed for pulling and pushing respectively. The acceleration time of
the 1/4 scale car has been recorded as 5.5 s with the response of drive wheels torque
Design and characterization of AmLi neutron sources for the LZ experiment
In this paper we describe the development, testing, and characterization of
three low-emission rate AmLi neutron sources. The sources are used to calibrate
the nuclear recoil response of the LUX-ZEPLIN (LZ) dark matter experiment. The
sources' neutron emission rate was measured using He proportional tubes.
The sources' gamma emissions were characterized using a high-purity germanium
(HPGe) detector. Source-validated GEANT4 Monte Carlo simulations allowed to
calibrate the Ge and neutron detector responses.Comment: 20 pages, 13 figures, 4 tables, revised manuscripts after
accommodating the reviewer's comment
Numerical analysis of the noise reduction effect by superposition of high frequency current in semiconductor lasers
Suppression phenomena of optical feedback noise in semiconductor lasers by the superposition of high frequency current have been numerically analyzed and explained with approximated but analytical equations. Correspondence between experiment and simulation is also demonstrated. © 2013 IEEE
Kinematics and nonlinear control of an electromagnetic actuated CVT system for passenger vehicle
An electromagnetic actuated continuously variable transmission (EMA-CVT) system is developed by two sets of electromagnetic actuators
(solenoid) located on primary and secondary pulley. A set of solenoids are attached to the primary and secondary pulley to develop
the attraction and repulsive forces. The relationships between the speed ratio and electromagnetic actuation and clamping force and
output torque of the CVT are established based on the kinematics of the EMA-CVT system. A Fuzzy Logic Controller (FLC) is developed
to control the EMA precisely based on the feedback of the RPM sensor and slope sensor. The EMA-CVT performance with controller
has found 28% more than the performance of the EMA-CVT without controller. The solenoids of the EMA were activated by
varying the current supply with the Fuzzy-Proportional-Derivative-Integrator (FPID) to maintain the non-linearity of the CVT in response of the vehicle traction torque demand. Result shows that the solenoid is able to pull the plunger in the desired distance with supply current of 12.5 amp while push the plunger to the desired distance with 14.00 amp current supply to the windings when the vehicle is
considered in 10% grade. The acceleration time of the ¼ scale car has been recorded as 5.5 s with the response of drive wheels torque
Analytical approximate solutions of the duffing-relativistic oscillator
The aim of this paper is to use high-order harmonic balance method (HBM) as a novel solution procedure for investigation of the Duffing-relativistic oscillation. Usually, a set of complex nonlinear algebraic equations is appeared when HBM is applied. Investigating analytically for such kind of complex nonlinear algebraic equations is tremendously difficult and cumbersome. In the present study, a small parameter is found, for which the power series solutions produces desired results. The obtained results are evaluated by comparing with the exact solutions computed numerically. The effect of initial conditions in the nonlinear natural frequencies is carried out and it is proved the proposed method is not only simple, but also more reliable for analysis for the Duffing-relativistic oscillator. The method is mainly illustrated in strongly nonlinear Duffing-relativistic oscillator, but it can be widely applicable in other problems arising nonlinear sciences and engineering
Formulation of hybrid 3D image segmentation algorithm based partial differential equation
Segmentation is an important tool for analysis and understanding of most images encountered in science and engineering. One of the best segmentation methods that can perform 3D segmentation is the level-set method which has its mathematical foundation in partial differential equation (PDE). Owing to its complex nature, it exhibits a level of unacceptable sluggishness on implementation hence a need to hasten up the process by hybridizing it with a faster region-based segmentation method which is inherently a logical approach to segmentation pivoted on thresholding but not as good in segmentation as the former. This work presents a mathematical hybrid of the two methods that is hoped to produce a better segmentation result
A novel intraperitoneal metastatic xenograft mouse model for survival outcome assessment of esophageal adenocarcinoma
Esophageal adenocarcinoma (EAC) has become the dominant type of esophageal cancer in United States. The 5-year survival rate of EAC is below 20% and most patients present with locally advanced or widespread metastatic disease, where current treatment is largely ineffective. Therefore, new therapeutic approaches are urgently needed. Improvement of EAC patient outcome requires well-characterized animal models in which to evaluate novel therapeutics. In this study we aimed to establish a peritoneal dissemination xenograft mouse model of EAC that would support survival outcome analyses. To find the best candidate cell line from 7 human EAC cell lines of different origin named ESO26, OE33, ESO51, SK-GT-2, OE19, OACM5.1C and Flo-1 were injected intraperitoneally/subcutaneously into SCID mice. The peritoneal/xenograft tumor formation and mouse survival were compared among different groups. All cell lines injected subcutaneously formed tumors within 3 months at variable rates. All cell lines except OACM5.1C formed intraperitoneal tumors within 3 months at variable rates. Median animal survival with peritoneal dissemination was 108 days for ESO26 cells (5X106), 65 days for OE33 cells (5X106), 88 days for ESO51 cells (5X106), 76 days for SK-GT-2 cells (5X106), 55 days for OE19 cells (5X106), 45 days for OE19 cells (10X106) and 82 days for Flo-1 cells (5X106). Interestingly, only in the OE19 model all mice (7/7 for 5X106 and 5/5 for10X106) developed bloody ascites with liver metastasis after intraperitoneal injection. The median survival time of these animals was the shortest (45 days for 10X106 cells). In addition, median survival was significantly increased after paclitaxel treatment compared with the control group (57 days versus 45 days, p = 0.0034) along with a significant decrease of the relative subcutaneous tumor volume (p = 0.00011). Thus peritoneal dissemination mouse xenograft model for survival outcome assessment after intraperitoneal injection of OE19 cells will be very useful for the evaluation of cancer therapeutics
Applying quality improvement methods to neglected conditions: Development of the South Asia Burn Registry (SABR)
Objective: South Asia has the highest mortality rate from burns in the world. Application of quality improvement methods to burn care can help identify health system gaps. Our overall aim is to introduce a sustainable hospital-based burn registry for resource-constrained settings to assess health outcomes of burn injury patients presenting to dedicated burn injury centers in South Asia.Results: The South Asia Burn Registry (SABR) is implemented through collaborative approach in selected burn centers in Bangladesh and Pakistan. Th registry collects data on burn injury events, the care provided, and the functional status of patients at discharge from burn centers. It covers the entire spectrum of care provision for burn injury patients from the actual event through their discharge from the healthcare system. SABR investigates locally relevant contextual factors associated with burn injury and health-system requirements for burn patients receiving emergency and inpatient care in resource-constrained settings. It also explores factors associated with burn injury and care provision. SABR will inform better prevention and management efforts in South Asia and help to address healthcare needs of burn injury patients
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