Abstract: A propulsor fan array having reduced noise emission is disclosed. The propulsor fan array includes a plurality of propulsor fans that collectively generate thrust. Each of the propulsor fans include a blade fan having a plurality of blades. The plurality of blades are tensioned at tips of the plurality of blade fans such that a pitch of the blades during thrust generation is substantially the same as a pitch of the blades at rest. By tensioning the tips of the blades, an angle of the blades is maintained during operation of the propulsor fan thereby reducing noise that may result from changes in the angle of the blades.

Abstract: A wave power system for extracting energy from water waves, The wave power system includes a basic structure comprising at least one straight track section; at least one effector movably engaged with said basic structurer and adapted for being moved by water waves along said straight track section in a travelling length between two stop locations; and an energy harvesting arrangement arranged for harvesting energy from said relative movements between said energy collector and said basic structurer. The effector includes a backbone structure comprising at least one support shaft having a support shaft axis. At least one winglet comprising a compliant portion is rooted to the support shaft and is turnable between operation modes comprising an acceleration mode an intermediate mode and a deceleration mode relative to the support shaft axis.

Abstract: A scroll casing has a scroll portion, a discharge portion provided with a discharge port, and a tongue portion. An extended plate has, in a cross section obtained by cutting in a thickness direction, a change point, at which an enlargement ratio of an area of the cross section is enlarged so as to be larger on a downstream side than that on an upstream side due to a change of inclination. In the extended plate, an angle ?1, and an angle ?2 satisfy a relationship of either 0??2<?1 or 0<?2??1. A distance L1 and a distance L2 satisfy a relationship of L2<L1.

Abstract: A novel diffuser for a centrifugal turbomachine to reduce or prevent stall. The diffuser includes diffuser vanes arranged around a diffuser axis. Each diffuser vane includes: a leading edge, a trailing edge, a suction side facing radially inwardly, and a pressure side facing radially outwardly. A respective flow passage is defined between the suction side of a first diffuser vane and the pressure side of a second diffuser vane of each pair of adjacently arranged diffuser vanes. The diffuser vanes are arranged with a non-constant pitch around the diffuser axis. The pitch between each pair of adjacently arranged first diffuser vane and second diffuser vane defining a respective flow passage there between is correlated to a chord of one of said first diffuser vane and second diffuser vane.

Abstract: An impeller for a centrifugal fan rotatable about a central axis extending in an axial direction includes a hub portion expanding radially outward about the central axis, and wings on a radially outer side of the hub portion. A cross-sectional shape of the wing in a circumferential direction is a wing shape.

Abstract: A fan includes a rotor; a stator; a first bearing assembly disposed at a radial outer side of an end of the rotor; and an impeller including an impeller body, where the impeller body is provided with a receiving cavity for receiving the first bearing assembly; and one end of the first bearing assembly is disposed in the receiving cavity, and the rotor, the first bearing assembly and the impeller body are disposed coaxially.

Abstract: A method for monitoring at least one rotor blade of a wind turbine includes implementing, via a controller, a control scheme for monitoring blade damage of the at least one rotor blade. The control scheme includes monitoring at least one electrical condition of a pitch system of the wind turbine. The method also includes converting the electrical condition(s) of the pitch system into a frequency domain. Further, the method includes determining one or more peaks of the frequency domain around a frequency component related to a natural frequency of the rotor blade. Moreover, the method includes determining a frequency deviation between the one or more peaks of the frequency domain and the frequency component related to the natural frequency of the rotor blade. As such, a frequency deviation outside of a predetermined frequency range is indicative of a rotor blade anomaly. Thus, the method includes implementing a control action when the frequency deviation is outside of the predetermined frequency range.

Abstract: This invention is an aircraft of the type known as a “Convertiplane” which can conduct vertical flight operations in the manner of a rotor-wing aircraft and conduct cruise flight operations in the manner of a fixed-wing aircraft. This aircraft has rotor blades mounted on each wingtip and tilting propulsors mounted at the tips of the horizontal stabilizers on the aircraft tail. The wingtip mounted rotor blades and vertically oriented tail propulsors provide thrust for vertical takeoff. To transition to cruise flight, at sufficient airspeed, the wingtip rotors are stopped and moved from the rotor-wing position to a “V” configuration extending out from the wingtips to function as ailerons, while the tail mounted propulsors are tilted forward from a vertical to a horizontal orientation to provide thrust for forward flight.

Abstract: A rotor blade for a turbomachine includes a base, a tip opposite the base in a spanwise direction, a leading edge, and a trailing edge opposite the leading edge in a chordwise direction. A pressure surface extends from the leading edge to the trailing edge, and extends from the base to the tip. A suction surface extends from the leading edge to the trailing edge, and extends from the base to the tip. The tip includes a tip seal additively manufactured to the rotor blade. The tip seal includes a first portion with a first composition and a second portion with a second composition different from the first composition.

Abstract: Embodiments are directed to a blade lock comprising a fold lock adapted to prevent folding of a rotor blade in a fold-lock position and to allow folding of the rotor blade in a pitch-lock position. The blade lock further comprises a pitch lock adapted to allow pitch movement of a rotor blade in a fold-lock position and to prevent pitch movement of the rotor blade in the pitch-lock position. A spring-loaded link pivotally connects both the fold lock and the pitch lock and is adapted to provide passive, overcenter locking in the fold-lock position. An actuator is coupled to the pitch lock and is adapted to move the pitch lock and the fold lock between the fold-lock and pitch-lock positions.

Abstract: A fan case assembly extend along and around a center axis. The fan case assembly may comprise a barrel extending along and around the center axis, the barrel configured to fasten to a flange of an engine case. The fan case assembly may comprise a fan track liner disposed radially inward of the barrel and a containment hook, wherein the containment hook is a discrete component separate from the barrel. The containment hook may include a front segment configured to fasten to the flange, and an axial segment disposed radially inward of the barrel. The axial segment may extend between the flange and the fan track liner and the front segment may extend radially outward from an end of the axial segment. The containment hook may also include a protruding segment extending radially inward from the axial segment.

Abstract: A virtual fabrication environment for semiconductor device structures that includes the use of virtual metrology measurement data to optimize a virtual fabrication sequence is described. Further, calibration of the virtual fabrication environment is performed by comparing virtual metrology data generated from a virtual fabrication run with a subset of measurements performed in a physical fabrication environment. Additionally, virtual experiments conducted in the virtual fabrication environment of the present invention generate multiple device structure models using ranges of process and design parameter variations for an integrated process flow and design space of interest.

Abstract: Examples of techniques for automated attribute propagation and hierarchical consistency checking are disclosed. In one example implementation according to aspects of the present disclosure, a computer-implemented method may include: detecting, by a processor, a non-standard extension during convergence of an integrated circuit logic design; propagating, by the processor, the non-standard extension to each level of a plurality of hierarchies of the integrated circuit design for which a net utilizes a special constraint; and verifying, by the processor, a hierarchy consistency across each level of the plurality of hierarchies.

Abstract: A method includes receiving a circuit design comprising an input scan chain comprising a plurality of latches connected by one or more scan connections, dividing the plurality of latches into one or more clusters, determining a number of scan controls for each cluster, placing the determined scan controls in selected locations; and adjusting the scan connections based on the scan control location. A corresponding computer system and computer program product are also disclosed.

Abstract: A photomask lithography simulation model is created for making a semiconductor chip. Poor metrology is filtered and removed from a contour-specific metrology dataset to improve performance of the photomask. Filtering is performed by the application of a weighting scheme.

Abstract: A method and system for optimizing state assignments for a finite state machine. The method generates a random initial state assignment for each of a plurality of states of the finite state machine, determines an initial cost associated with the random initial state assignments, identifies a code swap to explore as a function of a code swap probability. Further, the method calculates a cost for the code swap when one or more criteria is satisfied, updates the code swap probability as a function of the cost of the code swap and a best cost, performs the code swap when the cost of the swap is smaller than the best cost and/or a current cost to optimize the state assignments, and outputs optimized state assignments.

Abstract: A method and system for optimizing state assignments for a finite state machine. The method generates a random initial state assignment for each of a plurality of states of the finite state machine, determines an initial cost associated with the random initial state assignments, identifies a code swap to explore as a function of a code swap probability. Further, the method calculates a cost for the code swap when one or more criteria is satisfied, updates the code swap probability as a function of the cost of the code swap and a best cost, performs the code swap when the cost of the swap is smaller than the best cost and/or a current cost to optimize the state assignments, and outputs optimized state assignments.

Abstract: Various embodiments include computer-implemented methods, computer program products and systems for analyzing at least one feature in a layout representing an integrated circuit (IC) for an overlay effect. In some cases, approaches include a computer-implemented method including: modeling a topography of the IC by running at least one of a chemical mechanical polishing (CMP) model, a deposition model or an etch model on a data file representing the IC after formation of an uppermost layer; modeling the at least one feature in the IC for an overlay effect using the topography model of the IC; and modifying the data file representing the IC after formation of the uppermost layer in response to detecting the overlay effect in the at least one feature, the overlay effect occurring in a layer underlying the uppermost layer.

Abstract: Disclosed are methods and apparatus for providing feature classification for inspection of a photolithographic mask. A design database for fabrication of a mask includes polygons that are each defined by a set of vertices. Any of the polygons that abut each other are grouped together. Any grouped polygons are healed so as to eliminate interior edges of each set of grouped polygons to obtain a polygon corresponding to a covering region of such set of grouped polygons. Geometric constraints that specify requirements for detecting a plurality of feature classes are provided and used for detecting a plurality of feature classes in the polygons of the design database. The detected features classes are used to detect defects in the mask.

Abstract: Circuits and methods for loopback testing are provided. A die incorporates a receiver (RX) to each transmitter (TX) as well as a TX to each RX. This architecture is applied to each bit so, e.g., a die that transmits or receives 32 data bits during operation would have 32 transceivers (one for each bit). Focusing on one of the transceivers, a loopback architecture includes a TX data path and an RX data path that are coupled to each other through an external contact, such as a via at the transceiver. The die further includes a transmit clock tree feeding the TX data path and a receive clock tree feeding the RX data path. The transmit clock tree feeds the receive clock tree through a conductive clock node that is exposed on a surface of the die. Some systems further include a variable delay in the clock path.