Abstract: Embodiments include a technique for controlling aircraft VFG over voltage under fault or load-shed, the techniques includes using a control unit for generating signals to maintain a terminal output voltage and frequency, and a variable frequency generator, coupled to the control unit, for generating the terminal output voltage. The variable frequency generator includes a stator having a set of primary stator windings and a set of secondary stator windings for generating the terminal output voltage, and a switch coupled to the set of secondary stator windings, the switch is configured to operate at a threshold frequency of the VFG to regulate the terminal output voltage by supplementing the terminal output voltage produced by the set of primary stator windings reducing the VFG fault over-voltage.

Abstract: In an ultra-wideband (“UWB”) receiver, a received UWB signal is periodically digitized as a series of ternary samples. The samples are continuously correlated with a predetermined preamble sequence to develop a correlation value. When the value exceeds a predetermined threshold, indicating that the preamble sequence is being received, estimates of the channel impulse response (“CIR”) are developed. When a start-of-frame delimiter (“SFD”) is detected, the best CIR estimate is provided to a channel matched filter (“CMF”) substantially to filter channel-injected noise.

Abstract: A flexible haptic actuator and corresponding method. The flexible haptic actuator comprises a core formed with a flexible material. The core defines a volume and is bendable. An electrical conductor is coiled around the core and is bendable. A casing surrounds the electrical conductor and at least a part of the core. The casing includes a plurality of flexible sections and a plurality of stiff sections. The casing is bendable. A haptic mass is suspended in the volume, the haptic mass being at least partially formed with a magnetic material. The haptic mass is movable in the volume in response to the electrical conductor generating a magnetic field.

Abstract: A reciprocating motion energy conversion apparatus is adapted to capture kinetic energy of wind, waves, or other reciprocating or turbulent motion in order to generate electricity. A rolling shaft rests on a shaft guide frame, with the rolling shaft being coupled to the input shaft of at least one electric generator. As the shaft guide frame tilts or rocks, the rolling shaft rolls on the shaft guide frame, turning the input shaft of the generator and producing electricity. In a Wave rocker embodiment, the shaft guide surface is secured within a buoyant, waterproof enclosure, which is placed in a body of water to convert energy from wave motions. In a Wind board embodiment, the shaft guide frame is suspended from two swing panels, which are put into swinging motion by turbulent winds, causing the rolling shaft to roll and turn the input shaft of each pair of electric generators.

Abstract: A computer-implemented method for detecting an unattended living presence in a vehicle having at least two doors, comprising determining, before the vehicle starts moving, a first total number of vehicle door openings utilizing a non added-on door sensor integrated in the vehicle, each of the door sensors is associated with at least one of the at least two doors and is indicative of a door state, wherein each opening of a door indicates a change in a door state of a door, out of the at least two doors, from a door closed state to a door open state; determining, after the vehicle has stopped moving and until being locked, a second total number of vehicle door openings utilizing the non added-on door sensors; and in case the first total number exceeds the second total number, outputting an alert on a possible unattended living presence in a vehicle.

Abstract: A power system includes an integrated drive generator (IDG) including an exciter field winding. A generator control unit (GCU) includes exciter drive circuit configured to electrically energize the exciter field winding, and a main stator configured to output voltage to at least one electrical load. The exciter drive circuit includes a dynamic flyback unit configured to selectively operate the exciter drive circuit between a first mode and a second mode different from the first mode based on a change in the at least one electrical load.

Abstract: A network device capable of performing rule-based actions dependent on geolocation-based conditions or realtime conditions from an external source. The network device can obtain its geolocation, obtain a rule based on a condition, query sources for and/or calculate updated statuses of the condition based on the geolocation, and perform actions based on the updated status of the condition, the geolocation, and the rule. The network device is capable of safely shutting down when voltage supplied to the network device falls outside of and acceptable range.

Abstract: A turbine for generating electrical power includes oppositely rotating wheels which can be driven primarily by wind for driving a plurality of electrical power generators, or by a motor which may be a diesel, solar, electrical, or alternative fuel motor. One or more of the generators can also function as motors for driving the wheels. A method for generating electrical power involves a pair of wheels which rotate oppositely on a central shaft and a plurality of generators driven by the rotation of the wheels for generating power. The rotation of the wheels can be adjusted to a desired speed having regard to the current velocity of the wind and by means of a motor which is connected to the wheels so as to impart rotation thereof.

Abstract: Digital certificates are signed by a server's private key and installed at lock controllers that restrict access to physical resources. The server's public key is distributed to lock controllers and to mobile electronic devices operated by users who are given access to the physical resources. Lock-access data is digitally signed by the server's private key and provided to mobile electronic devices to facilitate access. The lock controller validates lock-access data and grants access conditionally based on time, version, and/or identity data provided within lock-access data. The use of certificates reduces the need to rely on a security scheme specific to the network. Lock controllers can also broadcast status notifications, so that updates and log data can be securely communicated with the server using mobile electronic devices as a proxy. The system is highly scalable, as each lock controller need not track the full scope of access permissions.

Abstract: This disclosure discusses systems and methods related to the following example scenarios. When an aerial vehicle of an airborne wind turbine is functioning normally in motoring mode, a voltage converter may receive a nominal voltage from a power conversion system and provide the nominal voltage to the aerial vehicle. When the aerial vehicle is experiencing a fault in motoring mode, the voltage converter may receive the nominal voltage and provide a reduced fault voltage to the aerial vehicle. When the aerial vehicle is functioning normally in power-generating mode, the voltage converter may receive the nominal voltage from the aerial vehicle and provide the nominal voltage to the power conversion system. When the aerial vehicle is experiencing a fault in power-generating mode, the voltage converter may receive a reduced fault voltage from the aerial vehicle, boost the fault voltage, and provide the boosted fault voltage to the power conversion system.

Abstract: A methods is provided for reliable and accurate detection of opening or closing of doors or drawers using output signals generated by a sensor, the output signals directly or indirectly representative of the acceleration of the sensor over time. Areas under a curve for acceleration, or representations thereof, are determined and occurrence of movement events identified through comparison of calculated areas with certain thresholds. Areas are considered which span between zero crossing points of the acceleration curve, such that all elements of the corresponding sum are of the same sign, and consequent area signals have maximal amplitude. Pairs of substantially equal and opposite area signals may be sought, occurring within a given time separation, these characteristic of an opening or closing motion, consisting of a first acceleration in a first direction followed by a second in an opposing direction. Apparatus for the reliable detection of opening or closing events is also provided.

Abstract: A dual engine generator has two engines and two inverters and two alternators configured within an inner enclosure. An outer enclosure extends around the inner enclosure to create plenums for airflow. Cooling airflow enters through the outer cover and flows through the plenums and into the inner enclosure to cool the components therein. Airflows out of the inner enclosure and into the plenums and finally exhausts from the outer enclosure. The outer enclosure may have rounded sides to form a pill shaped enclosure. The outer covers are configured to deflect or flex in high wind condition and protect the inner enclosure. The engines are configured above the alternator and inverter and a flow of air reduces heat from the engines from overheating the other components. The mufflers are within the plenums and a flow of exhaust air from within the inner enclosure is directed over the mufflers.

Abstract: A drive of an energy generation system with a drive shaft (9) has an electrical machine (8) which is connected to a power system (10), and a differential gear mechanism (3) with three drives and outputs, wherein a first drive is connected to the drive shaft (9), an output is connected to the electric machine (8), and a second drive is connected to a differential drive (6) which is connected via a frequency converter (7) and optionally a transformer (5) to the power system (10). The electric machine (8) can be connected to the frequency converter (7) and as result full converter mode can continue to be operated at relatively low wind speeds.

Abstract: A method and an apparatus for controlling a smart home device to upload data and a method and an apparatus for acquiring data uploaded by a smart home device are provided. The method includes: acquiring operation status data of the smart home device; and according to binding relationships of the smart home device with application servers, sending the operation status data to all bound application servers; wherein the smart home device is bound to at least two application servers.

Abstract: The disclosed teachings relate to intruder detection. Some of the subject matter described herein includes a computer-implemented method for detecting physical movement using a wireless mesh network that provides wireless data communication, the wireless mesh network having a plurality of mesh points, each mesh point having a wireless coverage, the method including compiling a database of known devices based on monitoring unique identifiers of known devices that have previously conducted communication with the wireless mesh network through the plurality of mesh points; upon detecting a physical presence of a subject device within a physical space of the wireless mesh network, determining, based on the database of known devices, whether the physical presence of the subject device belongs to an anomaly; and when the physical presence of the subject device is determined to be an anomaly, causing a security action to be performed.

Abstract: The wind turbine includes a wind driven turbine wheel rotatable about a central axis that has sail wings that catch the wind and rotate the turbine wheel. An anchor has its anchor line attached to the turbine wheel at its axis of rotation to prevent tilting the wind turbine in response to high wind conditions. A set of streamers attached to the spokes at one end and including a free end wherein the free end is disposed in a space defined between two adjacent spokes when the turbine wheel is rotating. A trolley removably and slidably attached to a main anchor line, a secondary anchor line attached to the trolley and a secondary anchor; and, a drop line removably attached to the secondary anchor configured to lower the anchor to the main anchor so that the trolley, secondary anchor line and secondary anchor is configured to provide an anchor support structure for the main anchor.

Abstract: A presentation of visual information relates to an accurate identity of a person. Visible data corresponding to the identity is rendered upon a wearable badge associated uniquely with the person. The rendered visible data are augmented dynamically. The augmentation includes adding a conspicuous indication to the rendered visible data, in real time, that an authorized security credential corresponding to the person is exceeded in relation to a presence of the person in a particular location.

Abstract: A method for security and/or automation systems is described. In one embodiment, the method includes receiving social media data via a signal, analyzing the social media data based at least in part on a first parameter, identifying occupancy information based at least in part on the analyzing, and assessing a structure occupancy based at least in part on the identifying.

Abstract: A system includes one or more synchronous generators mechanically coupled to an excitation system. The excitation system is configured to output an excitation signal to excite the synchronous generator to produce a voltage and a current at an output of the synchronous generator. During startup of the synchronous generator, the excitation system may also output pulses of the excitation signal to initiate synchronism of one or more non-rotating electric motors electrically coupled to the synchronous generator. In addition, the pulses may be output to urge rotation of the non-rotating electric motors into rotational electrical alignment with the synchronous generator and each other.

Abstract: A method of controlling operation of a variable speed, constant frequency generator system is disclosed. During operation, loads may be added to or removed from the output of the generator system. A controller monitors the power output by the generator system and detects a change in the output power exceeding a predefined threshold. The change indicates the addition of a large electrical load. The controller quickly detects the change in power output and activates a relay to disconnect the load from the generator system. The controller then accelerates the engine of the generator system to maximum speed and reconnects the load to the output of the generator system.