Safe Operating Conditions to Prevent Damage in Ni-YSZ Anode Supported SOFC

2019 ◽  
Vol 35 (1) ◽  
pp. 1571-1579 ◽  
Author(s):  
Virginie Roche ◽  
Claude Roux ◽  
Marlu Cesar Steil
Keyword(s):  
Operating Conditions ◽  
Safe Operating

Recent Advances in Lower Bound Shakedown Analysis

2009 ◽  
Author(s):  
Dieter Weichert ◽  
Abdelkader Hachemi
Keyword(s):  
Finite Element ◽  
Lower Bound ◽  
Process Engineering ◽  
Operating Conditions ◽  
Structural Elements ◽  
Shakedown Analysis ◽  
Material Models ◽  
Practical Engineering ◽  
Safe Operating ◽  
New Algorithms

The special interest in lower bound shakedown analysis is that it provides, at least in principle, safe operating conditions for sensitive structures or structural elements under fluctuating thermo-mechanical loading as to be found in power- and process engineering. In this paper achievements obtained over the last years to introduce more sophisticated material models into the framework of shakedown analysis are developed. Also new algorithms will be presented that allow using the addressed numerical methods as post-processor for commercial finite element codes. Examples from practical engineering will illustrate the potential of the methodology.

scholarly journals Enhanced dynamic voltage clamping capability of Clustered IGBT at turn-off period

2016 ◽  
Vol 29 (1) ◽  
pp. 1-10
Author(s):  
Hong Long ◽  
Mark Sweet ◽  
Sankara Narayanan
Keyword(s):  
Numerical Evaluation ◽  
Load Condition ◽  
Operating Conditions ◽  
Current Gain ◽  
Power Devices ◽  
Inductive Load ◽  
Dynamic Voltage ◽  
Voltage Clamping ◽  
Safe Operating ◽  
Off Time

One of the critical requirements for high power devices is to have rugged and reliable capability against hash operating conditions. In this paper, we present the dynamic voltage clamping capability of 3.3kV Field Stop Clustered IGBT devices under extreme inductive load condition. It shows that PMOS trench gate CIGBT structure with outstanding performance of fast turn-off time and low over-shoot voltage. Further optimization of current gain of CIGBT structure is analyzed through numerical evaluation. A step further in the safe operating area has been achieved for high voltage devices by CIGBT technology.

scholarly journals Safe operating conditions for NSLS-II Storage Ring Frontends commissioning

2015 ◽  
Author(s):  
S. Seletskiy ◽  
C. Amundsen ◽  
K. Ha ◽  
A. Hussein
Keyword(s):  
Storage Ring ◽  
Operating Conditions ◽  
Safe Operating

scholarly journals Analysis and optimization of the wall-climbing robot with an adsorption system and adhesive belts

2020 ◽  
Vol 17 (3) ◽  
pp. 172988142092640
Author(s):  
Jinfu Liu ◽  
Linsen Xu ◽  
Jiajun Xu ◽  
Lei Liu ◽  
Gaoxin Cheng ◽  
...  
Keyword(s):  
High Stability ◽  
Operating Conditions ◽  
Brick Wall ◽  
Adsorption System ◽  
Exterior Wall ◽  
Climbing Robot ◽  
Ceramic Brick ◽  
Attachment Mechanism ◽  
Safe Operating ◽  
Moving Speed

This article presents an innovative wall-climbing robot for detection on smooth wall surfaces, which consists of a vacuum adsorption system and adhesion belts, making the robot flexible and effectively steerable. Moreover, the detailed attachment mechanism is further analyzed for the climbing tasks. Safe operating conditions, kinematics, and dynamic model are derived, respectively, indicating that at least the adsorption force of 30 N and the motor torque of 2 N·m are required for stable climbing of the robot. Furthermore, the prototype of the wall-climbing robot is manufactured and the climbing abilities are tested on various wall surfaces showing that the maximum moving speed and corresponding load are 7.11 cm/s and 0.8 kg on the concrete exterior wall, 5.9 cm/s and 0.75 kg on the ceramic brick wall, 6.09 cm/s and 0.85 kg on the lime wall, and 5.9 cm/s and 1 kg on the acrylic surface, respectively, which demonstrates that the robot has high stability and adaptability.

MCNP Simulation of In-Core Dose Rates for an Offline CANDU® Reactor

2017 ◽  
Vol 3 (3) ◽  
Author(s):  
Jordan G. Gilbert ◽  
Scott Nokleby ◽  
Ed Waller
Keyword(s):  
Monte Carlo ◽  
Dose Rate ◽  
Integrated Circuit ◽  
Multidisciplinary Team ◽  
Operating Conditions ◽  
Inspection System ◽  
Dose Rates ◽  
Pressure Tubes ◽  
Circuit Components ◽  
Safe Operating

Inspections of pressure tubes in CANDU® reactors are a key part of maintaining safe operating conditions. The current inspection system, the channel inspection and gauging apparatus for reactors (CIGAR), performs the job well but is limited by the fact that it can only inspect one channel at a time. A multidisciplinary team is currently developing a novel robotic inspection system. As part of this work, a Monte Carlo N-particle (MCNP) model has been developed in order to predict the dose rates that the improved inspection system will be exposed to and, from this, predict the component lifetime. This MCNP model will be capable of predicting in-core dose rates at any location within the reactor, and as such could be used for other situations where the in-core dose rate needs to be known. Based on estimates from this model, it is expected that at 7 days after shutdown, the improved inspection system could survive in core for approximately 7 h, providing it uses a tungsten shield 2.5 cm in thickness around the integrated circuit components. This is expected to be sufficient to perform a single inspection.

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