Abstract: A method of modeling a heat exchanger is disclosed and comprises assigning input temperatures, assumed output temperatures, and a set of flow rates, inputting the parameters into a set of equations arranged to calculate a heat transfer coefficient, inputting parameters into a second set of equations arranged to calculate output temperatures, substituting actual output temperatures for the assumed output temperatures, and again calculating the heat transfer cooefficient. The new heat transfer coefficient is then used to obtain revised actual output temperatures, and the initial actual output temperatures and the revised actual output temperatures are compared to determine whether they differ by less than a desired variance. If not, a new iteration is performed until the output temperatures converge.

Abstract: A sub-system is provided to a discrete event simulator (DES) to expedite simulation execution by first detecting a non-quiescent steady-state condition in the simulated system, and when the steady-state condition is detected, the simulator determines a state, and subsequently simulates the system at a skip-ahead time using this determined state, or a predicted state based on the determined state. Convergence analysis is used to determine whether the system is at, or approaching, a steady-state condition. This convergence skip-ahead process achieves faster analysis by avoiding the computation that would conventionally be required to simulate the system behavior during the time interval that is skipped.

Abstract: A reflecting surface design system (50) has (1) first rendering means (54) for displaying a free-form surface (20) on which a plurality of segments (24), each of which is defined by a plurality of vertices (251 to 254), are formed, (2) reflection information specifying means (56) for specifying the vertex position and light reflecting direction for each of the plurality of vertices (251 to 254) that define one of the plurality of segments (24), and (3) surface calculation means (58) for calculating a surface (S) to be assigned to the one segment (24) on the basis of the vertex positions and light reflecting directions specified for the plurality of vertices (251 to 254) that define one segment (24), and the light source position, which is specified in advance.

Abstract: A method for calculating using a digital computer an approximation of properties of a concrete sandwich panel. The method allows for a manufacturer of concrete sandwich panels to design sandwich panels using a range of available components to meet architectural specifications.

Abstract: A method and system for instrumenting testcase execution processing of a hardware description language (HDL) model using a simulation control program. In accordance with the method of the present invention, a set name application program interface (API) entry point is called wherein the set name API entry point includes program instructions for naming a simulation control program in association with testcase execution of the HDL model. A create event API entry point is called, wherein the create event API entry point includes an event identifier input parameter which identifies a testcase execution event with respect to the named simulation control program. In response to executing a testcase simulation cycle, signal values are retrieved from the HDL model into an instrumentation code block, wherein the instrumentation code block includes program instructions for processing the retrieved signals to detect whether the testcase execution event has occurred during the testcase simulation cycle.

Abstract: Method and apparatus for simulating operations of a circuit design that includes high-level components and HDL components. The high-level components of the design are simulated in a high-level modeling system (HLMS), and the HDL components of the design are simulated with an HDL simulator. Data values are converted from a data type of the HLMS to a logic vector compatible with the HDL simulator for each data value to be input to the HDL simulator, and a logic vector is converted from the HDL simulator to a data value of a data type compatible with the HLMS for each logic vector output from the HDL simulator. Events are scheduled for input to the HDL simulator as a function of the time of HLMS events and a maximum response time of the HDL components.

Abstract: Disclosed herein is a method of storing data results of simulation processing of a hardware description language (HDL) model based upon keywords. In accordance with the method, result data obtained by simulation of at least one HDL model are received. In association with the result data, a plurality of value sets is received, where each value set includes at least one keyword having an associated value. Each keyword identifies a parameter external to the HDL model that affected the result data. The data results are stored within a data storage subsystem in association with the plurality of value sets such that particular result data are attributable to particular ones of the plurality of value sets. In one embodiment, a keyword table is built in the data storage system that indicates which data subdirectories store result data associated with particular value sets. The result data can then be queried based upon selected keywords of interest, for example, by reference to the keyword table.

Abstract: A tape storage emulator provides response data corresponding to a tape storage device and receives a non-media command from a server. The response data is sent to the server in response to the non-media command. A media command is received from the server. The media command is applied to a virtual tape volume configured on a disk storage device.

Abstract: A simulation device capable of displaying still images of a three-dimensional model of a machine such as a robot in the midst of an operation of the machine and simulating the operation from a start to the midst of the operation. The simulation device receives historical data (lapsing time information and positional information associated with the lapsing time information) of the operation of the machine to perform the simulation of the operation by displaying an image of the three-dimensional model of the machine by animation. When a capturing trigger signal is issued manually or automatically in the simulation, the image of the three-dimensional model is reduced and stored to be associated with the historical data of the operation of the machine at the issuance of the capturing trigger signal. The obtained reduced images are displayed in time series in the order of lapsing time.

Abstract: A technique for detecting and correcting inaccuracies in curve-fitted models. Humps and dips in a curve-fitted model are identified. An analysis is performed on the humps and dips to determine if they are large enough to warrant correction. If so, then the source of the simulation and/or empirical data is modified to taking corrective action to improve the curve fit between the edge point and the next actual simulation and/or empirical data point.

Abstract: A simulation control program receives a hardware description language (HDL) model including design entities and count event registers. Each count event registers is associated with a respective instance of an event. The count event registers include first and second registers for counting occurrences of a same replicated event generated within different instances of a same design entity having a same hierarchical level within the HDL model. The simulation control program also receives a correlation data structure indicating which count event registers are associated with instances of the same replicated event. During simulation processing, each of the count event registers maintains a respective count value representing a number of times an associated event instance occurs. The simulation control program sums count values of the first and second count event registers in accordance with the correlation data structure and outputs a count event data packet containing the aggregate count value.

Abstract: Dynamic cosimulation is implemented using a cosimulation bridge for data exchange between a primary simulator and a secondary simulator, and a plurality of user selected optimization control signals defined over the cosimulation bridge. At least one user selected optimization control signal is identified for disabling the cosimulation bridge. The primary simulator and secondary simulator are dynamically disengaged for ending data exchange responsive to disabling the cosimulation bridge. Responsive to optimization control signal going inactive, the primary simulator and secondary simulator are dynamically re-engaged for data exchange. The optimization control signals include a single sided disable; a two independent disable; a functional OR disable; a functional AND disable, and suspend signals. The single sided disable and the two independent disable enable disabling one side of the cosimulation bridge and not the other side.

Abstract: A method and system for controlling both the pressure and temperature at the engine air intake, engine crankcase, and at the engine exhaust so that pressure and temperature conditions are equilibrated. Engines are tested both at simulated high altitudes (operating air at barometric pressures lower than the local barometric pressure at the test site) and low altitudes (operating air at barometric pressure higher than the local barometer at the test site) and at a variety of operating air temperatures. The method and system provide for the balancing of air pressure at the engine air intake and crankcase and engine exhaust. The effect of unbalanced air pressure is on engine emission test results is demonstrated.

Abstract: A system and method for downloading over a network operating systems or other executable programs to a computer that may not have a boot device or other device containing the executable program. The computer may boot in real mode and transfer data packets using a UDP protocol. The computer may virtualize disk requests and encapsulate them as UDP packets as required or useful.

Abstract: A pneumatic device selection system has a computer, first through sixth databases connected to the computer and storing data of at least pneumatic devices, a coordinate input unit and a keyboard connected to the computer, for entering input data based on an input action of an operator into the computer, and a display unit connected to the computer, for displaying information from the computer. The pneumatic device selection system functionally has a first selection processor for selecting a cylinder operating system based on input data from the coordinate input unit or the like, and a second selection processor for selecting a shock absorber based on input data from the coordinate input unit or the like and/or a selection result from the first selection processor.

Abstract: Systems and methods for, inter alia, geographically based analyses of traffic being carried over a wide scale traffic network. The systems integrate geographical information systems (GIS) with traffic simulation processes to allow a user to analyze traffic patterns and loads at specific geographic locations of regions. Additionally, these systems allow for traffic analysis over a wide scale traffic network that may encompass the traffic network that exists within an geographic region and can include, as examples, the traffic networks that span across a city, that interconnect cities, that interconnect states and that run across multiple states. To this end, the systems include traffic simulators that can adaptively or controllably select between multiple traffic simulation models for simulating traffic across different segments of the traffic network. The different models provide varying levels of granularity for measurements of geographical location of a vehicle traveling over the traffic network.

Abstract: Analyzing interactions between vias in multilayered electronic packages that include at least two spaced-apart conducting planes, and multiple vias that connect signal traces on different layers. Voltages at active via ports are represented as magnetic ring current sources, which generate electromagnetic modes inside the plane structure. Substantial electromagnetic coupling between vias occurs. A full-wave solution of multiple scattering among cylindrical vias in planar waveguides is derived using Foldy-Lax equations. By using the equivalence principle, the coupling is decomposed into interior and exterior problems. For the interior problem, the dyadic Green's function is expressed in terms of vector cylindrical waves and waveguide modes. The Foldy-Lax equations for multiple scattering among the cylindrical vias are applied, and waveguide modes are decoupled in the Foldy-Lax equations.

Abstract: A method of providing accelerated post-silicon testing for a silicon hardware includes computing a simulation cumulative record of state using a plurality of test instructions and a cycle breakpoint, performing a simulation of an instrumented logic design using the plurality of test instructions and the cycle breakpoint, manufacturing the silicon hardware using the instrumented logic design, computing a silicon cumulative record of state by executing the plurality of instructions using the silicon hardware; and comparing the simulation cumulative record of state to the silicon cumulative record of state.

Abstract: A system for emulating a telematics client is provided. The system includes a workstation in communication with a display screen. A software stack configured to be executed by the workstation to implement functionality for a telematics client is included. The software stack imitates a configuration of an in-vehicle telematics stack of a telematics control unit (TCU). The software stack includes a service gateway for loading an emulator. A user interface (UI) manager configured to communicate with the loaded emulator is included with the software stack. The UI manager enables a presentation of TCU user interface without accessing the TCU. Methods to emulate a user interface and loading an emulator on a workstation are also provided.

Abstract: Methods for finite-difference-based inkjet simulation enable more precise control of ink droplet size and shape. A discrete transformation (mapping) is constructed so that a quadrilateral grid in physical space is transferred to the uniform square grid in a computational space. Since the grid in the computational space is square, numerical finite difference differentiation can be easily done. Governing partial differential equations, including a viscosity term, a surface tension term, and a level set convection equation for two-phase flows, are derived on the quadrilateral grid and then transformed to the computational space for application on the uniform square grid. A stable and powerful numerical algorithm is developed to solve the derived and transformed equations to enable finite-difference-based ink-jet simulation.