Abstract: A pressure plate, a component of the clutch system, was analyzed by two-dimensional and
three-dimensional finite element method under three major load conditions of thermal loading due to
temperature distribution, centrifugal force and contact pressure of diaphragm spring. The results show
that the effects of thermal loading and contact pressure of diaphragm spring are important, which
suggests the direction of design improvement. A hub plate was also analyzed with finite element
modeling. A stress concentration occurs around the fillet region around the window in the plate where
the fracture analysis is executed to find the stress intensity factors. These results will be used as the
fundamental data for design improvement of the shapes of pressure plates and hub plates.
Abstract: Self-chatter is a serious problem in cutting process. This paper aims to solve the problem by
establishing time series model of vibration acceleration signal in cutting process based on Hidden
Markov Model (HMM) technology and achieve the purpose of chatter recognition and prediction.
Features which can indicate cutting state are extracted from the acceleration signal. HMM parameters
are obtained by model training, and the reference models database is built. Then cutting state
recognition is performed according to the feature matching level. Simulations and experiments are
conducted, and the results show that the proposed method is feasible and it could get high recognition
Abstract: To improve the accuracy and overcome the flaws of single neural network, an integrated
neural classifier for stream turbine vibration fault identification is proposed based on particle swarm
optimization (PSO) in the paper. The method firstly establishes diagnosis decision table of stream
turbines from fault sources to fault symptoms based on wavelet package decomposition technique to
faults wave-shape. Then the discrete decision table is acquired by quantifying attribute values in
decision table using information entropy, a simplified decision table then is generated by rough set
reduction. Based on it, several neural networks are applied to identify steam turbine faults at the same
time, and their results are integrated with PSO-based. Both simulation and trial in stream turbine
damage identification indicate that the proposed method has higher identification rate and shorter
training time as well as excellent generalized ability, and is an ideal pattern classifier.
Abstract: Based on the von Kármán classical nonlinear plate theory, nonlinear axisymmetric
vibrations of a clamped thin circular plate subjected to transverse harmonic load are investigated.
Effects of static deformation on the vibration responses are considered. Harmonic motion is assumed.
The time variable is eliminated and the partial differential equations are converted into a system of
nonlinear ordinary differential equations by employing a Kantorovich time averaging method. The
resulting nonlinear ordinary differential boundary-value problem is solved numerically by using
shooting method. Effects of static-dynamic load on the transverse deflection, frequencies and
amplitudes are examined in details. The resonance phenomenon is discussed emphatically.
Abstract: The mechanical properties of various parts of the welding-line material are different,
while they play very important role in the welding structures, such as the differences of the melted
part and the temperature-affected part. In this paper, a non-contacting laser based technique, ISDG
(Interference Strain Displacement Gauge) method, is applied to find out these property differences
on very small specimen. The testing is very successful and the whole stress-strain curves in such
small scale are obtained on different parts of the welding-line material. The soften phenomena of
the temperature-affected part is observed by the comparison of the Young’s modulus and yield
stress between the melted part and the temperature-affected part.
Abstract: This paper describes a carbody structural analysis and the result of its loading test. The
purpose of this study is to evaluate the safety and functionality of the body structure operating under
maximum load. Aluminum alloy was used as the body structure’s material. The body structure
consisted of side frame, under frame, roof frame, and end frame. Of these components, the side
frame and under frame were the most important components considering the vehicle and passenger
loads. Both structural analysis and loading test were performed under the condition based on
"Performance Test Standard for Electrical Multiple Unit" with the reference code JIS E 7105. The
test results showed that the body structure is safe and stable under the condition of designed load.
Abstract: Linear and nonlinear shear strength models of rockfill, and the safety factor criterion of
nonlinear shear strength were discussed in this paper. The slope stability of 261.5 m high Nuozhadu
rockfill dam was analyzed with three different shear strength models. The safety factors are almost
equal and the positions of potential failure surface are similar. It is found that the allowable safety
factor base on linear criterion in the existing code can be used without any change when applying
nonlinear shear strength rules.
Abstract: The deformation and strength characteristic of rockfill is different when it is dry or wet.
The wetting effects should be a major factor in the long-term settlement of a rockfill dam. The 160 m
high Yellow River Xiaolangdi dam is a rockfill dam with inclined core clay. Moistening laboratory
tests were carried out to investigate the deformation and strength characteristic of the rockfill in the
Xiaolangdi dam. Based on the test results, two-dimensional consolidation numerical simulations on
the dam employed nonlinear stress strain constitutive model were conducted to investigate the effects
of wetting on the deformation performance of the dam.
Abstract: This study was aimed to verify the performance and stability of the 3rd rail type power
collector for rubber-tired vehicles. Performance (power interruptions), durability (stresses), stability
(vibrations and contact force variations) of the developed power collector were measured and
analyzed, while the rubber-tired vehicle ran at various speeds on the test track(about 2.4km).
Abstract: The crankshafts of semi-finished products were manufactured by two processes: as-cast
followed by normalizing and iron mould with sand liner as-cast. Then those were machined and
nitridized followed by the bending fatigue test. At last mechanical properties and impact properties of
sampled crankshafts were tested. The mechanical properties are similar in the crankshafts treated by
both of the processes, however, the bending fatigue limits of as-cast spherical graphite iron
crankshafts are much higher than that of normalized spherical graphite iron crankshafts, whose crack
producing work and extending work is higher as well. The higher extended work is considered to
relate to the oeil-de-boeuf ferrite and graphite structure and pearlite in as-cast spherical graphite iron
crankshafts, while the normalized ones with lower fatigue limit value are composed of spherical
graphite and pearlite. Cracks having initiated in the graphite, the tips of cracks can be blunted and the
crack propagation can be impeded efficiently by ferrites surrounding the graphite in this structure.