摘要:
This invention is directed to a method and apparatus to find out an optimum solution in automatic routing or automatic placement with certainty and at a high-speed to improve a routing rate, and to realize automatic routing in a high-density. To these end, a routing approach is selected in a conversational mode while routing efficiency is consulted to compose routing processing procedure so as to generate a routing program. Besides, component placement processing procedures designated according to placement control information are combined to generate the placement program. A straight line between component pins adjacent to each other is defined as a chord, a wave for maze method routing is generated from a start point toward an end point of a routing path and propagated between the chords adjacent to each other. Positions of the chords through which the wave has passed until reaching the end point from the start point are successively stored and the positions through which the wave has passed is traced back to the start point from the end point when the wave reaches the end point to decide a routing path of the routing pattern. The method and apparatus of this invention are applicable to routing design or component placement design of LSIs, multichip modules, printed circuit boards, etc.
摘要:
Disclosed is an interactive CAD apparatus for logic circuit packaging design, wherein provisions are made to display delay times in real time when a component is being moved, so that error-contributing components and interconnections can be easily identified and the optimum position can be easily determined. The apparatus includes: a component moving unit, responsive to an operator's instruction, for moving a component on a display screen where a component placement diagram is displayed; an associated path extraction unit for extracting a signal path associated with the component being moved by the component moving unit; a temporary position calculation unit for calculating temporary position data representing a placement position corresponding to the position of the component on the display screen at prescribed intervals of time when the component is being moved by the component moving unit; an associated path delay calculation unit for successively calculating delay values for the signal path extracted by the associated path extraction unit, based on the temporary position data calculated by the temporary position calculation unit; and an associated path delay display unit for successively displaying the delay values calculated by the associated path delay calculation unit.
摘要:
A wiring CAD apparatus wherein a situation of a noticed event can be identified at a moment on a screen. The wiring CAD apparatus comprises a searching timing detection section for detecting a new displaying processing/deletion processing timing as a searching timing for a non-wired pin, a non-wired pin searching section operable in response to the searching timing detected by said searching timing detection section for searching the non-wired pin, and a display data production section for producing display data in accordance with which the non-wired pin searched out by said non-wired pin searching section is to be displayed on a display section in a visually distinguishable condition from another already wired part pin. The display data produced by said display data production section is displayed on the display section under the control of a displaying control section. The wiring CAD apparatus can be applied to a CAD system with which wiring designing for an LSI, an MCM, a PWB or the like can be performed interactively.
摘要:
An active noise insulation wall includes an active sound reduction apparatus disposed on an upper end surface of a noise insulation wall. The active sound reduction apparatus comprises a combination of an active acoustic control cell and a sound tube. The active acoustic control cell controls a coming noise such that a diffracted sound pressure component of the coming noise at the upper end surface of the noise insulation wall is actively reduced. The sound tube decreases a sound wave of a frequency different from a target frequency of the active acoustic control cell. Thus, the active noise insulation wall can effectively reduce noises including many frequency components.
摘要:
A viewfinder control unit includes a liquid crystal viewfinder with a hood; a sensor for picking up the face of a cameraman; a pan motor for horizontally rotating the viewfinder; and a tilt motor for varying the angle the viewfinder makes with a horizontal plane to provide the cameraman with an optimum view angle. The viewfinder undergoes tracking control such that it is always trained on the face of a cameraman in response to the panning (left or right swing of a lens) and the tilting (up or down swing of the lens) of the television camera.
摘要:
A combustor structure of a gas turbine, in which a sheet-like vibration damper, which resonates with the air vibration in the intake chamber and absorbs the energy of the air vibration, is attached to the inner wall of the casing by an attaching member via a space.The sheet-like vibration damper is made of a single-layered thin flat plate or multi-layered thin flat plates. In case of the multi-layered thin flat plate, the air vibration energy in the intake chamber is absorbed not only by resonance but also by friction among the multi-layered thin plates. The sheet-like vibration damper may be made of a three-dimensional profile member having an inner space in which the attaching member is housed. If the thin flat plates are used, the surface areas thereof are not identical. If the three-dimensional profile members are used, the volumes of the inner spaces are not identical. Consequently, the sheet-like vibration damper can absorb and attenuate the vibration energy of different frequencies. If holes to connect spaces on opposite sides of the sheet-like vibration damper are formed in the sheet-like vibration damper, the air circulates between the spaces on opposite sides of the sheet-like vibration damper. Thus, the sheet-like vibration damper easily vibrates.
摘要:
A gas turbine exhaust passage is realized which may suppress the radiation of strong ultra low frequency noise to the outside without amplifying the turbulence of an high speed exhaust gas flow rate or a pressure pulsation generated in a gas turbine. At least a portion of a wall of a gas turbine exhaust passage (3, 5) is formed of an acoustically transmissive material (36, 56) for allowing a low frequency noise of several tens of Hz or less to pass therethrough sufficiently. Also, the acoustically transmissive material is made of one or more of a porous material, a porous heat insulating material, a mesh having a large flow resistance, cloth or film material. Further, the acoustically transmissive material is supported by a porous plate or a frame. In a case where an acoustically transmissive material is used only for an exhaust chimney (5), the exhaust chimney (5) is supported by a rack (11). Further, a soundproof panel (12) may be attached to the rack (11). Also, a damper provided at a branch portion between an exhaust gas boiler branched from the gas turbine exhaust passage and the gas turbine exhaust passage is formed of acoustically transmissive material for allowing a low frequency noise of several tens of Hz or less to pass therethrough sufficiently.
摘要:
An active acoustic wall has sound-pressure detectors provided within respective cells so that a detected signal acts to oscillate an oscillation plate in the cell. A porous material on a surface is thereby provided with a high sound absorption coefficient over a wide frequency range. A space between a porous material or a perforated plate 1 on the surface and a back material fixed on a back side is divided into a plurality of sections so as to form cells 10 containing an air layer or a porous sound-absorbing material. Oscillation plates 6 are arranged within respective cells 10 so as to be driven for oscillation by oscillation-plate driving units 5. Sound-pressure detectors 7 are provided close to the porous material 1 in the cell 10 so that a detected signal is inputted to a signal-processing unit 8. The signal processing unit 8 outputs a signal to the driving unit 5 for oscillating the oscillation plate 6 such that an output of the sound-pressure detector is minimized. The sound pressure on the surface of the porous material 1 is minimized at all frequencies. The velocity of particles on the surface becomes large so that the particles are turned into thermal energy, thereby providing a high sound-absorption coefficient.
摘要:
A gas turbine combustor in which a part or all of the wall of the combustor disposed within an intake chamber is formed as an acoustic energy absorbing member that can absorb the acoustic energy of a combustion variation generated within the combustor. The acoustic energy absorbing member is constructed of a thin corrugated plate in a circumferential direction, a high-temperature-proof perforated material, or a back plate disposed at the outside of a perforated plate in a radial direction with a distance from the perforated plate. It is also possible to provide a covering member at the outside of the acoustic energy absorbing member in a radial direction, for covering the acoustic energy absorbing member with a distance from the acoustic energy absorbing member. It is preferable that the acoustic energy-absorbing member and/or the covering member are reinforced with a frame that extends in a circumferential direction and/or a longitudinal direction.
摘要:
A process for the continuous firing of powdered carbon which comprises firing powdered carbon continuously by feeding powdered carbon into a firing tube and applying microwaves to the top surface of a deposited layer of the powdered carbon so as to form a high-temperature fired layer within the deposited layer, and an apparatus therefor.