No abstract

No abstract

The work of this paper presents the use of MPSO which is an evolutionary optimizer. The work objective is finding the optimal shape of triangular slot in a tire tread block. The numbers of design parameters with triangular slot are 9. They are used to characterize size and position of the triangular slot in a tire tread block. The optimization methods are implemented to solve two objectives. First, the normal contact stress at contact patch region must be lowest and second, the friction contact stress at the same region must be highest. Therefore, the problem type is bi-objective optimization. The finite element analyses are simulated by modeling of tire tread block contacting to the friction surface with commercial finite element program (ANSYS). The models are simulated as compressing and sliding or braking situation. The tire tread block is modeled as hyperelastic material which used the three basic tests, i.e., uni-axial tensile test, planar shear test and equal bi-axial tensile test. The best fitted of hyperelastic material model for the work is Ogden Hyper Foam order 3th. The results of work are present as the mean of design parameters which are accepted for two objectives.

The pipeline transportation industry has expanded significantly because of its convenience and speed, but it faces problems. This research is to study the failure of piping caused by a water hammer which is a behavior of the check valve when the pump stops working. This causes, a loud noise and the pipe is deformed due to vibration. Therefore, this research analyzes the deformation of the pipeline due to a pressure surge and measures the vibration of the piping system when the check valve works. The resulting analysis can be used to predict the phenomenon that can cause deformation of the pipeline. The principles of fluid structure interactions using the theory of fluid and theoretical mechanics with materials engineering are used to solve problems that occur at Khon Kaen Beer in Thailand. In this research, the modeling and analysis of the piping systems uses the ANSYS program and results show the predicted failures match those in actual pipelines.

In the present work the configuration of 3.5 inch hard disk drives disk rotating at 10,000 rpm was modified by attaching a spoiler to reduce windage on HDD rotation. Hard disk drives were analyzed using two models. In one model the attached spoiler was on the front surface of the Head Stack Assembly (HSA) while in the other the attached spoiler was on the back surface of the HSA. Flex is estimated using a hexahedron mesh. The resulting maximum transient structure total deformation is 875 nm at time 4 ms with no attached spoiler and minimum transient structure total deformation is 385 nm at time 2 ms with a spoiler attached to the front surface HSA. Modified 3.5 inch hard disk drives with an attached spoiler on the front surface HSA gave better results than other models.