The Simulation and Design of High Subsonic Wing Aircraft

This paper intends to present the application of Computational Fluid Dynamic (CFD) on the simulation and design of high subsonic wing of transport aircraft. The computation was performed using RAMPANT, an unstructured, multigrid flow solver. A 2-D and 3-D model of the wing was created using CATIA (2D and 3D modeling). A corresponding grid was created using preBFC and TGrid. The paper describes the technique of creating the grid and using the CFD on the wing design process. It then discusses the benefits and penalties of using the above tools. Description is then given in using the aerodynamic analysis result to optimize the wing. It concludes with a discussion of the results and recommendations for future work

Load-displacement behavior of glass fiber/epoxy composite plates with circular cut-outs subjected to compressive load

An experimental study of the behavior of woven glass fiber/epoxy composite laminated panels under compression is presented. Compression tests were performed on to 16 fiber-glass laminated plates with and without circular cut-outs using the compressed machine. The maximum load of failure for each of the glass-fiber/epoxy laminated plates under compression has been determined experimentally. A parametric study was performed as well to investigate the effects of varying the centrally located circular cut-out sizes and fiber angle-ply orientations on to the ultimate load. The experimental work revealed that as the cut-out size increases, the maximum load of the composite plate decreases. Also, it has been observed that cross-ply laminates possess the greatest ultimate load as compared to other types of ply stacking sequences and orientations

Evolutionarily stable strategies for defensive switching

This paper concentrates on the study of ecological stability for guaranteeing evolutionarily stable strategies in a two-predator and one-prey model system. It is assumed that the prey has defensive switching property of predation-avoidance which can be characterized by two parameters: the relative alertness of the prey against a predator, u, and the intensity of defensive switching, n. Assuming that the system is encountered with another immigrant prey with altered defensive switching parameters one after another, the conditions of replacement of the former occupant prey by an immigrant are studied. It is shown that the system eventually attains the evolutionarily stable state such that no entry of an immigrant prey is possible. Unless some trade-off relation exists between u and n, the evolutionarily stable state is not unique, but it is given by a set of parameters {u, n} which form a curve designated “ESS line”. Thus, it is seen that if a number of two-predator and one-prey systems are allowed to evolve independently, each system will reach a different state on the “ESS line”. Finally, we discuss a strategy that leads to optimal (minimum) prey consumption by both predators in relation to the “ESS line”

Regional Investment Attractiveness: Rating to 134 Regencies/Cities in Indonesia & Problems on Business Environment

Committed to bring regional autonomy policy to a more meaningful existence, KPPOD (Regional Autonomy Watch) again comes up with result of another rating. This time, statistical aspects and dynamic aspects were combined to better rate autonomous regions and capture their real dynamics. Our focuses remain two: policy variables and endowment variables. Policy variables are grouped into two factors, namely institutional factor and sociopolitical factor; endowment variables into three: regional economy, labor and productivity, and physical infrastructure. For the whole, 42 indicators were employed here, each with its value different from others from the perception of business community. The research includes 134 regions, consisting of 97 regencies and 37 cities spread in 26 provinces in Indonesia. Data used in the analysis of indicators were primary and secondary, qualitative and quantitative. Valuation of variables and processing of data were done using AHP (The Analytic Hierarchy Process) method

Daya Tarik Investasi Kabupaten/Kota di Indonesia: Peringkat 134 Kabupaten/Kota di Indonesia & Gambaran Permasalahan Dunia Usaha

Selain perwujudan demokratisasi, dan pelembagaan hubungan pemerintahan pusat – daerah dan antar daerah, kesejahteraan rakyat menjadi salah satu dari tiga tujuan utama otonomi daerah; hal ini berarti bahwa dari segi ekonomi, keberhasilan otonomi daerah diukur dari sejauhmana warga daerah mendapat akses ekonomi yang lebih dari masa sebelumnya. Berbagai tolok ukur bisa digunakan dalam hal akses ekonomi itu, namun ukuran yang sangat jelas adalah keterserapan tenaga kerja secara langsung serta multiplier effect yang muncul dari adanya investasi