Abstract: Goal setting safety legislation for high pressure systems was first introduced in 1973 and
retained in the High Pressure Safety Management Law in Korea. This has enabled a move towards
inspection strategies based on the risk of failure. This trend towards a risk based approach is being
supported by extensive plant operating experience, improved understanding of material degradation
mechanisms, and the availability of fitness-for-service assessment procedures. RBI (Risk-Based
Inspection) is very effective and efficient of the inspection and maintenance techniques. In particular,
RBI will be found how to apply both inspection interval as a result of RBI implementation and
re-inspection interval of pressurized equipment defined by the High Pressure Safety Management
Law in Korea. The objectives of this paper are to develop an enhanced KGS-RBITM program to
resolve shortcoming inclusive of the above issue and to evaluate the risks of equipments in Naphtha
Cracking Center (NCC) which is a typical facility of petrochemical plant using the KGS-RBITM
program. The results of the risk assessment and re-inspection interval of internal opening using
KGS-RBITM program are useful in determining the inspection planning.
Abstract: Establishment of a reasonable expert system integrated developing environment (ES-IDE)
is a critical factor for developing ES promptly and effectively. By current investigation and analysis of
related technology, a kind of IDE for fault diagnosis expert system (FDES) on the base of
Protégé+CLIPS+Eclipse tool-chain was brought forward. The model of FDES was realized by
Protégé and described by ontological analysis method. Combined with CLIPS, inference engine and
knowledge base (KB) were realized and applied to diagnose and deduce, the developing period of ES
core framework was shortened, and flexibility of system was increased. Based on component
principle, every system module was encapsulated in form of Eclipse plug-in, so users can reconstruct
and reconfigure to compile and make ES application instance uniformly according to their specific
demands. Industry experiments prove that this system can generate FDES in a shorter period, has
strong transplanting ability and friendly human-computer interface.
Abstract: Aiming at some problems in the fields of industry monitoring technology (IMT) such as
bad dynamic ability and poor versatility, this paper brought forward a kind of intelligent Status
monitoring and Fault diagnosis Network System (SFNS) based on UPnP-Universal Plug and Play.
The model for fault diagnosis network system was established according to characteristics and
requirements of IMT network, and system network architecture was designed and realized by UPnP.
Using embedded system technology, real-time data collection node, monitoring center node and data
storage server were designed, and that supplies powerful real-time data support for SFNS. Industry
fields experiments proved that this system can realize self recognition, seamless linkage and other self
adapting ability, and can break through the limitation of real IP address to achieve real-time remote
monitoring on line.
Abstract: Stochastic finite element method and reliability technique are used to determine the
safety degree of the turbine blade with parametric uncertainty. The material, geometric parameters
and rotating speed of blade exhibit notable random fluctuations, so the conventional deterministic
analysis of blade can’t provide complete information. The stochastic analysis can tackle the
uncertainties in structural parameters and obtain the probabilistic characteristic of the vibration
characteristic. In this paper, the study focuses on the reliability assessment of the blade with
uncertainty parameters based on the stochastic finite element method (SFEM) and the
mean-variance method. The perturbation stochastic finite element method (PSFEM) is used to
calculate probabilistic characteristic of the natural vibration of the turbine blade. Based on the
stochastic finite element method, the mean-variance method is used to calculate the resonance
reliability of the blade. The example shows that the present method is valid.
Abstract: Rubber material properties and useful life evaluation are very important in design
procedure to assure the safety and reliability of the rubber components. In this paper, the heat aging
effects on the material properties and useful life prediction of rubber material for refrigerator
component were experimentally investigated. The accelerated heat aging tests were carried out to
predict the useful life of NBR and EPDM, which is used in refrigerator component. Compression set
results changes as the threshold are used for assessment of the useful life and time to threshold value
were plotted against reciprocal of absolute temperature to give the Arrhenius plot. By using the
compression set test, several useful life prediction equations for rubber material were proposed.
Abstract: The purpose of this study is to investigate the high temperature creep life of Waspaloy
using the Initial Strain Parameter Technique (ISPT). The creep tests were performed at the elevated
temperatures from 550oC to 700 oC. Constant stress creep tests were carried out in the experiment.
The initial strain was measured for one minute after loading. The creep life of Waspaloy was
calculated using the creep life prediction equation of ISPT. The confidence level between the
experimental rupture time and the calculated rupture time using the ISPT is within 95%. So, the
results show that the creep life prediction by the ISPT was a good agreement with LMP method.
Abstract: A method to predict impact load caused by drop impact of thin cone-shaped structures is
investigated. The Hertzian contact theory and the spherical shell theory are applied for modeling the
contact stiffness of the impact tip of the cone. Experiments and finite element simulations are
performed for several cones to evaluate the accuracy of impact load prediction. It is shown that
appropriate choice of contact stiffness model depending on the curvature and thickness of impact tip
of the cone is necessary in order to predict the impact load accurately.
Abstract: Wind-induced vibration of tall buildings have been of interest in engineering for a long
time. Wind-induced vibration of a tall building can be most effectively controlled by using passive
control devices. The tuned liquid damper(TLD) is kind of a passive mechanical damper, which relies
on the sloshing liquid in a rigid tank. TLD has been successfully employed in practical mitigation of
undesirable structural vibrations because it has several potential advantages: low costs, easy
installation in existing structures, and effectiveness even against small-amplitude vibrations. Shaking
table experiments were conducted to investigate the characteristics of the shallow water sloshing
motion in a rectangular tank. To increase the damping ratio of the rectangular water tank, triangle
sticks were installed at the bottom of water tank. This installation increased the damping ratio by
amaximum of 40-70%.
Abstract: An appropriate choice of building shape and architectural modifications can result in the
reduction of motion by altering the flow pattern around a building. Tapering which is one of
aerodynamic devices has been known to be effective to reduce acrosswind response [1, 2]. The
exterior wind loading patterns on claddings are sensitive to the building shape. When a building has
a tapered cross section along the height, the influence of the exterior wind loading patterns on the
wind-induced high-cycle fatigue damage of the cladding fastener of the tapered building needs to be
found. In this study, the fatigue damage of the cladding fastener of a non-tapered building and two
tapered buildings is estimated by using the rainflow cycle counting method and Miner’s rule. The
fatigue damage is compared with one another in order to investigate the influence of the tapered
cross section on the fatigue damage of cladding fasteners on side faces of tall buildings
Abstract: The action of wind pressures is a major consideration in the design of cladding and its
connections to building structures. Non-Gaussian environmental loads often may appropriately be
reduced to Gaussian loads through the central limit theorem, e.g., integral loads on a building under
wind loads. However, for the design load of cladding and its connections to building structures the
Gaussian assumption is not valid and loads remain non-Gaussian, especially in separated flow
regions. When the loads differ significantly from Gaussian distribution, they may lead to increase
expected damage. In this study, the wind-induced high-cycle fatigue damage of a cladding fastener
subjected to non-Gaussian local wind pressures and corresponding simulated Gaussian local wind
pressures is estimated by using the rainflow cycle counting method and Miner’s rule. The fatigue
damage is compared with each other in order to investigate the influence of non-Gaussian local
wind pressures on the fatigue damage of a cladding fastener on the side face of a tall building.