Materials compress each other in a directional material flow, causing energy and momentum to overflow. moving at low velocity outside the boundary of rigid component form finite dissipation zone. A discrete element model is established explore its characteristics. First, mass driven by disk increases linearly with an increase translation distance, significantly. Second, movement state materials...

in this paper, a simple and efficient method for modeling and solving the equations of a rotor with any number of disks, bearings and mass unbalances is presented using the assumed modes method. this model consists of a continuous shaft, arbitrary number of mass unbalances in any axial location and phase angle, and any number of rigid disks and bearings. this arrangement is extensively used in ...

We investigate the effect of rotating, triaxial halos on disk galaxies through an extensive set of numerical N -body simulations. Our simulations use a rigid potential field for the halos and bulges and collisionless particles for the disks. The triaxiality and the rotation rate of the halo are varied, as well as the masses of all three galaxy components. We analyze both the bar stability and t...

We used N-body dynamical simulations to analyze the conditions for the gravitational stability of a three-dimensional stellar disk in the grav-itational field of two rigid spherical components — a bulge and a halo, whose central concentrations and relative masses vary over wide ranges. The number of point masses N in the simulations varied from 40 to 500 thousands and the evolution of the simul...

Performance and reliability of any rotating machine can be studied by proper dynamic analysis of the machine. In this regard, this paper presents the method to study the dynamic response of the shaft of a Pelton turbine due to the impact of water jet. Equations of motion for the bending vibration of Pelton turbine assembly, in two transverse directions, is developed by using Lagrange equation o...

Object-oriented (OO) programming has limitations when used to implement abstract multi-scale, spatially-integrated, agent-based models, that could potentially be addressed using relational databases (RDB). Although this would involve rethinking the approach to designing such models, the combined OORDB approach has a number of appealing advantages for multi-scale simulations, such as allowing th...

We present advanced features of RDB2OWL mapping specification language that allows expressing RDB-to-RDF/OWL mappings in a concise and human comprehensible way. The RDB2OWL mappings can be regarded as documentation of the database-to-ontology relation. The RDB2OWL language uses the OWL ontology structure as a backbone for mapping specification by placing the database link information into the a...

In this paper, we present methods of translating transactions from object-oriented database(OODB) to relational database(RDB). The process involves schema mapping in data definition language(DDL) and transaction translation in data manipulation language(DML). They include scheme definition, data query and transaction operation of insert, update, and deletion. We also discuss the object-oriented...

The need for interoperation and data exchange through the Internet has made Extensible Markup Language (XML) a dominant standard language. Much work has already been done on translating relational data into XML documents and vice versa. However, there is not an integrated method to combine them together as a unifying technology for database interoperability on the Internet. Users may not be fam...

In ontology-based data access (OBDA) the users access relational databases (RDBs) via ontologies that mediate between the users and the data. Ontologies are connected to data via declarative ontologyto-RDB mappings that relate each ontological term to an SQL query. In this demo we present our system KeywDB that facilitates construction of ontology-to-RDB mappings in an interactive fashion. In K...