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Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Применить Всего найдено 20. Отображено 19.
27-06-2024 дата публикации

MODELING OF LIQUID-GAS MENISCUS DYNAMICS FOR ARBITRARY NOZZLE GEOMETRIES

Номер: US20240211655A1
Автор: Søren Taverniers, Adrian Lew, Svyatoslav Korneev, Christoforos Somarakis, Morad Behandish
Принадлежит: Xerox Corp

Techniques for determining a damping rate of unforced oscillations of a meniscus are disclosed. An example method includes receiving input describing a shape of a container, physical parameters of a liquid inside the container, and an equilibrium shape of the meniscus. The method also includes generating a mesh conforming to the shape of the container and generating a discrete version of a continuous eigenvalue problem based on this mesh. The method also includes computing, at appropriate mesh nodes, values for pressure, velocity components, and meniscus surface deformation corresponding to a suitable number of least-damped late-time oscillation modes of the liquid and computing an angular frequency and damping rate of these least-damped late-time oscillation modes from the discrete version of the continuous eigenvalue problem. The method also includes identifying the mode that has the lowest damping rate and computing a liquid relaxation time by inverting the damping rate of the identified mode.

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Номер записи: 1
04-06-2024 дата публикации

Characterizing liquid reflective surfaces in 3D liquid metal printing

Номер: US0012002265B2
Автор: Robert R. Price, Raja Bala, Svyatoslav Korneev, Christoforos Somarakis, Matthew Shreve, Adrian Lew, Palghat Ramesh
Принадлежит: XEROX CORPORATION

A method includes defining a model for a liquid while the liquid is positioned at least partially within a nozzle of a printer. The method also includes synthesizing video frames of the liquid using the model to produce synthetic video frames. The method also includes generating a labeled dataset that includes the synthetic video frames and corresponding model values. The method also includes receiving real video frames of the liquid while the liquid is positioned at least partially within the nozzle of the printer. The method also includes generating an inverse mapping from the real video frames to predicted model values using the labeled dataset. The method also includes reconstructing the liquid in the real video frames based at least partially upon the predicted model values.

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Номер записи: 2
29-12-2022 дата публикации

CHARACTERIZING LIQUID REFLECTIVE SURFACES IN 3D LIQUID METAL PRINTING

Номер: US20220410273A1
Автор: Robert R. Price, Raja Bala, Svyatoslav Korneev, Christoforos Somarakis, Matthew Shreve, Adrian Lew, Palghat Ramesh
Принадлежит: PALO ALTO RESEARCH CENTER INCORPORATED, XEROX CORPORATION

A three-dimensional (3D) printer includes a nozzle and a camera configured to capture a real image or a real video of a liquid metal while the liquid metal is positioned at least partially within the nozzle. The 3D printer also includes a computing system configured to perform operations. The operations include generating a model of the liquid metal positioned at least partially within the nozzle. The operations also include generating a simulated image or a simulated video of the liquid metal positioned at least partially within the nozzle based at least partially upon the model. The operations also include generating a labeled dataset that comprises the simulated image or the simulated video and a first set of parameters. The operations also include reconstructing the liquid metal in the real image or the real video based at least partially upon the labeled dataset.

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Номер записи: 3
26-09-2013 дата публикации

Method and System for Virtual Keyboard

Номер: US20130249821A1
Автор: Sohan Dharmaraja, Adam Duran, Adrian Lew
Принадлежит: The Board of Trustees of the Leland Stanford, Junior, University

In an embodiment of the invention, a virtual Braille keyboard is disclosed that makes use of a touch-sensitive computing device. In an embodiment of the invention, a calibration procedure is initiated by a user for determining the general position of various finger tips that will subsequently be used for the input of Braille characters. After calibration, the operation of a physical Braille keyboard is mimicked using methods according to an embodiment of the invention. 1. A computer-implemented method for implementing a virtual keyboard , comprising:receiving a predetermined input that indicates the initiating of a calibration procedure;receiving input from a touch-sensitive device that identifies a predetermined gesture of a predetermined number of fingertips of a user on the touch-sensitive device; andcalibrating a position of a user's predetermined number of fingertips for use with the virtual keyboard.receiving tactile information from the predetermined number of fingertips.2. The computer-implemented method of claim 1 , further comprising calibrating the size of each of the predetermined number of fingertips.3. The computer-implemented method of claim 1 , further comprising determining an allowed range of movement on the touch-sensitive device for movement of each of the predetermined number of fingertips4. The computer-implemented method of claim 1 , wherein the predetermined number of fingertips is eight.5. The computer-implemented method of claim 1 , wherein the predetermined number of fingertips is ten.6. The computer-implemented method of claim 1 , wherein the received tactile information is in accordance with a Braille keyboard.7. The computer-implemented method of claim 1 , wherein the received tactile information is in accordance with a QWERTY keyboard.8. The computer-implemented method of claim 1 , wherein the received tactile information is in accordance with a Dvorak keyboard.9. The computer-implemented method of claim 1 , wherein the predetermined ...

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Номер записи: 4
21-12-2023 дата публикации

TECHNIQUES FOR BINARIZING IMAGES TO DETERMINE JETTING QUALITY IN ADDITIVE MANUFACTURING

Номер: US20230410278A1
Автор: Christoforos Somarakis, Robert R. Price, Svyatoslav Korneev, Matt Patterson, Adrian Lew, Brendan Mcnamara, Eli Wilson
Принадлежит: Xerox Corp

Image processing techniques for determining print quality for a 3D printer are disclosed. An example method includes obtaining an image of material jetted from a nozzle of the 3D printer. The method also includes binarizing the image to distinguish background features from foreground features contained in the image. The method also includes determining, by a processing device, a jetting quality based on the binarized image.

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Номер записи: 5
29-12-2022 дата публикации

CHARACTERIZING LIQUID REFLECTIVE SURFACES IN 3D LIQUID METAL PRINTING

Номер: US20220414380A1
Автор: Robert R. Price, Raja Bala, Svyatoslav Korneev, Christoforos Somarakis, Matthew Shreve, Adrian Lew, Palghat Ramesh
Принадлежит: PALO ALTO RESEARCH CENTER INCORPORATED, XEROX CORPORATION

A method includes defining a model for a liquid while the liquid is positioned at least partially within a nozzle of a printer. The method also includes synthesizing video frames of the liquid using the model to produce synthetic video frames. The method also includes generating a labeled dataset that includes the synthetic video frames and corresponding model values. The method also includes receiving real video frames of the liquid while the liquid is positioned at least partially within the nozzle of the printer. The method also includes generating an inverse mapping from the real video frames to predicted model values using the labeled dataset. The method also includes reconstructing the liquid in the real video frames based at least partially upon the predicted model values.

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Номер записи: 6
16-04-2024 дата публикации

Characterizing liquid reflective surfaces in 3D liquid metal printing

Номер: US0011958112B2
Автор: Robert R. Price, Raja Bala, Svyatoslav Korneev, Christoforos Somarakis, Matthew Shreve, Adrian Lew, Palghat Ramesh
Принадлежит: XEROX CORPORATION

A three-dimensional (3D) printer includes a nozzle and a camera configured to capture a real image or a real video of a liquid metal while the liquid metal is positioned at least partially within the nozzle. The 3D printer also includes a computing system configured to perform operations. The operations include generating a model of the liquid metal positioned at least partially within the nozzle. The operations also include generating a simulated image or a simulated video of the liquid metal positioned at least partially within the nozzle based at least partially upon the model. The operations also include generating a labeled dataset that comprises the simulated image or the simulated video and a first set of parameters. The operations also include reconstructing the liquid metal in the real image or the real video based at least partially upon the labeled dataset.

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Номер записи: 7
21-12-2023 дата публикации

IMAGE PROCESSING TECHNIQUES FOR JETTING QUALITY CLASSIFICATION IN ADDITIVE MANUFACTURING

Номер: US20230410277A1
Автор: Christoforos Somarakis, Robert R. Price, Svyatoslav Korneev, Matt Patterson, Adrian Lew, Brendan Mcnamara, Eli Wilson
Принадлежит: Xerox Corp

Techniques for determining print quality for a 3D printer are disclosed. An example method includes obtaining an image of a stream of material jetted from a nozzle of the 3D printer, and binarizing the image to distinguish background features from foreground features contained in the image. The method also includes identifying elements of jetted material in the foreground features, and computing statistical data characterizing the identified elements. The method also includes generating a quality score of jetting quality based on the statistical data and controlling the 3D printer based on the quality score. The quality score indicates a degree to which the elements of jetted material form droplets of a same size, shape, alignment, and jetting frequency.

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Номер записи: 8
05-03-2024 дата публикации

Optimized nozzle design for drop-on-demand printers and methods thereof

Номер: US0011919241B1
Автор: Christoforos Somarakis, Svyatoslav Korneev, Saigopal Nelaturi, Adrian Lew
Принадлежит: XEROX CORPORATION

A method is disclosed for designing a nozzle for jetting printing material in a printing system including selecting a surface tension and viscosity of a printing material at a jetting temperature, selecting a drop volume of the printing material, and constructing a constricted axisymmetric dissipative section of the nozzle, which may include defining a length of the constricted axisymmetric dissipative section and defining a cross-sectional area of the constricted axisymmetric dissipative section. Other methods are disclosed involving receiving an input for a drop volume of the printing material, constructing a simulation of a constricted dissipative section of the nozzle by defining a length of the constricted dissipative section with respect to an orifice length and defining a cross-sectional area of the constricted dissipative section, and outputting the simulation of the constricted dissipative section to a display device and displaying on the display device an image representing the constricted dissipative section.

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Номер записи: 9
25-08-2022 дата публикации

Energy dissipative nozzles for drop-on-demand printing and methods thereof

Номер: US20220266512A1
Автор: Adrian Lew, Christoforos Somarakis, Saigopal Nelaturi, Svyatoslav Korneev
Принадлежит: Palo Alto Research Center Inc

A nozzle for a printing system is disclosed. The nozzle includes a tank in communication with a source of printing material. The nozzle also includes a constricted dissipative section in communication with the tank, which may include an elongated internal channel. The nozzle may also include a shaping tip in communication with the constricted dissipative section may include an exit orifice. The constricted dissipative section may be axisymmetric and may include at least three internal channels not in communication with one another. Also disclosed is an array of nozzles for a printing system including a plurality of nozzles, with each nozzle including a tank in communication with a source of printing material, a constricted dissipative section in communication with the tank and configured to obstruct fluid flow and having an elongated internal channel, and a shaping tip in communication with the constricted dissipative section may include an exit orifice.

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Номер записи: 10
25-08-2022 дата публикации

DROP-ON-DEMAND PRINTER HAVING OPTIMIZED NOZZLE DESIGN

Номер: US20220266513A1
Автор: Korneev Svyatoslav, Lew Adrian, Nelaturi Saigopal, Somarakis Christoforos
Принадлежит: PALO ALTO RESEARCH CENTER INCORPORATED

A drop-on-demand (DOD) printer is disclosed having an ejector which may include a nozzle, the nozzle including a tank in communication with a source of printing material, a constricted dissipative section in communication with the tank, which may include an elongated internal channel, and a shaping tip in communication with the constricted dissipative section which can include an exit orifice. The (DOD) printer also includes a power source configured to supply one or more pulses of power to the ejector, which causes one or more drops of the printing material to be jetted out of the nozzle. The DOD printer may include a constricted dissipative section configured to obstruct fluid flow that is cylindrical or axisymmetric and having a diameter less than a diameter of the tank and less than a diameter of the shaping tip. The DOD printer may include a nozzle or an array of nozzles. 1. A drop-on-demand (DOD) printer , comprising: a tank in communication with a source of printing material;', 'a constricted dissipative section in communication with the tank, comprising an elongated internal channel; and', 'a shaping tip in communication with the constricted dissipative section comprising an exit orifice; and, 'an ejector comprising a nozzle, the nozzle comprisinga power source configured to supply one or more pulses of power to the ejector, which causes one or more drops of the printing material to be jetted out of the nozzle.2. The DOD printer of claim 1 , wherein the constricted dissipative section of the nozzle is configured to obstruct fluid flow.3. The DOD printer of claim 1 , wherein the elongated internal channel is cylindrical.4. The DOD printer of claim 1 , wherein the constricted dissipative section of the nozzle is axisymmetric and has a diameter less than a diameter of the tank.5. The DOD printer of claim 1 , wherein the constricted dissipative section of the nozzle is axisymmetric and has a diameter less than a diameter of the shaping tip.6. The DOD printer of ...

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Номер записи: 11
29-09-2022 дата публикации

Nanotextured metal powders for 3D printing of metals

Номер: US20220305553A1
Автор: Adrian J. Lew, Andrew Curtis Lee, Ottman A. Tertuliano, Philip J. DePond, Wei Cai, Xun Gu
Принадлежит: Leland Stanford Junior University

Metal powder particles for use in additive manufacturing are made by removing material from the surface of the particles using wet chemical etching to create a nanoscale texturing of the surface, increasing absorptivity by the metal powder particles of incident laser light and maintaining flowability. The nanoscale texturing has sub-wavelength features at laser wavelengths in the range 800-1100 nm. The particles are substantially spherical and have mean diameters in the range 10-70 μm.

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Номер записи: 12
06-09-2022 дата публикации

ドロップオンデマンド印刷のためのエネルギー散逸性ノズル及びその方法

Номер: JP2022130312A
Автор: Korneev Svyatoslav, Lew Adrian, Nelaturi Saigopal, Somarakis Christoforos, エイドリアン・リュウ, クリストフォロス・ソマラキス, サイゴパル・ネラトゥリ, スヴィヤトスラフ・コルニーブ
Принадлежит: Palo Alto Research Center Inc

【課題】流体流を制御し、形状、容積、速度などの一貫した特性を持つ液滴を排出する。【解決手段】印刷システムのためのノズルが開示される。ノズルは、印刷材料の供給源と連通するタンクを含む。ノズルはまた、タンクと連通する狭窄散逸区間を含み、これは、細長い内部チャネルを含み得る。ノズルはまた、狭窄散逸区間と連通する整形先端部を含み得、これは、出口オリフィスを含み得る。狭窄散逸区間は、軸対称であり得、互いに連通しない少なくとも３つの内部チャネルを含み得る。複数のノズルを含む印刷システムのためのノズルのアレイも開示され、各ノズルは、印刷材料の供給源と連通するタンクと、タンクと連通し、流体流を遮断するように構成されており、かつ細長い内部チャネルを有する、狭窄散逸区間と、狭窄散逸区間と連通し、出口オリフィスを含み得る、整形先端部と、を含む。【選択図】図１

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Номер записи: 13
25-08-2022 дата публикации

Drop-on-demand-drucker mit optimierter düsenkonstruktion

Номер: DE102022101340A1
Автор: Adrian Lew, Christoforos Somarakis, Saigopal Nelaturi, Svyatoslav Korneev
Принадлежит: Palo Alto Research Center Inc

Es wird ein Drop-on-Demand-Drucker (DOD-Drucker) offenbart, der einen Auswerfer aufweist, der eine Düse einschließen kann, wobei die Düse einen Tank in Verbindung mit einer Druckmaterialquelle, einen verengten dissipativen Abschnitt in Verbindung mit dem Tank, der einen länglichen internen Kanal einschließen kann, und eine Formgebungsspitze in Verbindung mit dem verengten dissipativen Abschnitt, der eine Austrittsöffnung einschließen kann, einschließt. Der (DOD-)Drucker schließt auch eine Stromquelle ein, die konfiguriert ist, um den Auswerfer mit einem oder mehreren Stromimpulsen zu versorgen, was bewirkt, dass ein oder mehrere Tropfen des Druckmaterials aus der Düse ausgestoßen werden. Der DOD-Drucker kann einen verengten dissipativen Abschnitt einschließen, der konfiguriert ist, um den Fluidstrom zu behindern, der zylindrisch oder achsensymmetrisch ist und einen Durchmesser aufweist, der kleiner als ein Durchmesser des Tanks und kleiner als ein Durchmesser der Formgebungsspitze ist. Der DOD-Drucker kann eine Düse oder eine Anordnung von Düsen einschließen.

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Номер записи: 14
06-09-2022 дата публикации

最適化されたノズル設計を有するドロップオンデマンドプリンタ

Номер: JP2022130313A
Автор: Korneev Svyatoslav, Lew Adrian, Nelaturi Saigopal, Somarakis Christoforos, エイドリアン・リュウ, クリストフォロス・ソマラキス, サイゴパル・ネラトゥリ, スヴィヤトスラフ・コルニーブ
Принадлежит: Palo Alto Research Center Inc

【課題】緩和時間及び液滴特性を同時に制御することができるノズルを有するドロップオンデマンド（ＤＯＤ）プリンタを提供する。【解決手段】ノズルを含み得るエジェクタを有するドロップオンデマンドプリンタのノズルは、印刷材料の供給源と連通するタンクと、タンクと連通する狭窄散逸区間であって、細長い内部チャネルを含み得る、狭窄散逸区間と、狭窄散逸区間と連通する整形先端部であって、出口オリフィスを含むことができる、整形先端部と、を含む。プリンタは、１つ以上の電力パルスをエジェクタに供給するように構成された電源であって、印刷材料の１つ以上の液滴をノズルから噴出させる、電源も含む。プリンタは、流体流を遮断するように構成された狭窄散逸区間を含み得、この狭窄散逸区間は、円筒形又は軸対称であり、タンクの直径よりも小さくかつ整形先端部の直径よりも小さい直径を有する。プリンタは、ノズル又はノズルのアレイを含み得る。【選択図】図１

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Номер записи: 15
26-03-2024 дата публикации

Nanotextured metal powders for 3D printing of metals

Номер: US11938536B2
Автор: Adrian J. Lew, Andrew Curtis Lee, Ottman A. Tertuliano, Philip J. DePond, Wei Cai, Xun Gu
Принадлежит: Leland Stanford Junior University

Metal powder particles for use in additive manufacturing are made by removing material from the surface of the particles using wet chemical etching to create a nanoscale texturing of the surface, increasing absorptivity by the metal powder particles of incident laser light and maintaining flowability. The nanoscale texturing has sub-wavelength features at laser wavelengths in the range 800-1100 nm. The particles are substantially spherical and have mean diameters in the range 10-70 μm.

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Номер записи: 16
23-07-2024 дата публикации

Energy dissipative nozzles for drop-on-demand printing and methods thereof

Номер: US12042991B2
Автор: Adrian Lew, Christoforos Somarakis, Saigopal Nelaturi, Svyatoslav Korneev
Принадлежит: Xerox Corp

A nozzle for a printing system is disclosed. The nozzle includes a tank in communication with a source of printing material. The nozzle also includes a constricted dissipative section in communication with the tank, which may include an elongated internal channel. The nozzle may also include a shaping tip in communication with the constricted dissipative section may include an exit orifice. The constricted dissipative section may be axisymmetric and may include at least three internal channels not in communication with one another. Also disclosed is an array of nozzles for a printing system including a plurality of nozzles, with each nozzle including a tank in communication with a source of printing material, a constricted dissipative section in communication with the tank and configured to obstruct fluid flow and having an elongated internal channel, and a shaping tip in communication with the constricted dissipative section may include an exit orifice.

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Номер записи: 17
09-11-2023 дата публикации

Multi-fidelity approach to modeling of molten droplet coalescence in additive manufacturing

Номер: US20230356302A1
Автор: Adrian Lew, Giovanna Bucci, Morad Behandish, Svyatoslav Korneev
Принадлежит: Xerox Corp

Techniques for calibrating a high fidelity (HF) model of molten droplet coalescence are disclosed. An example method includes selecting initial HF parameter values for the HF model. The method also includes iteratively refining the HF parameter values until the HF model converges with experimental data. At each iteration, the HF parameter values are applied to the HF model and a plurality of simulations are run using the HF model to generate the simulated numerical data. For each simulation, a Reduced Order Model (ROM) is fitted to the simulated numerical data to generate ROM parameter values for ROM parameters of the ROM. Correlations between the ROM parameters and the HF parameters are identified to narrow the search space to be searched in a next iteration.

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Номер записи: 18
16-11-2023 дата публикации

積層造形における溶融液滴合体のモデリングへの多忠実度手法

Номер: JP2023165619A
Автор: Behandish Morad, Bucci Giovanna, Korneev Svyatoslav, Lew Adrian, エイドリアン、リュー, ジョヴァンナ、ブッチ, スヴィヤトスラフ、コルニーブ, モラド、ベハンディッシュ
Принадлежит: Palo Alto Research Center Inc

【課題】３Ｄプリンタの出力をシミュレートするための溶融液滴合体の高忠実度（ＨＦ）モデルを較正する方法、装置及び記憶媒体を提供する。【解決手段】方法は、ＨＦモデルの初期ＨＦパラメータ値を選択することと、ＨＦモデルが実験データに収束するまで、ＨＦパラメータ値を反復的に精緻化することと、を含む。各反復において、ＨＦパラメータ値をＨＦモデルに適用し、シミュレートされた数値データを生成するために、ＨＦモデルを使用して複数のシミュレーションを実行する。各シミュレーションについて、次数低減モデル（ＲＯＭ）をシミュレートされた数値データに適合させて、ＲＯＭのＲＯＭパラメータについてのＲＯＭパラメータ値を生成する。ＲＯＭパラメータとＨＦパラメータとの間の相関を、次の反復において探索する探索空間を狭めるために特定する。【選択図】図１２

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Номер записи: 19