Abstract: A nonlinear closed-loop control combined with an integral time-delay feedback control is disclosed to adjust a speed ratio of an infinitely variable transmission (IVT) system. A speed ratio control for an IVT system involves a forward speed controller and a crank length controller for different speed ranges. The time-delay control is designed to reduce speed fluctuations of the output speed of an IVT with an accurate speed ratio. The speed ratio of an IVT with the disclosed control strategy can achieve an excellent tracking response for the desired constant output speed and reduce speed fluctuations of the output speed of an IVT by the time-delay feedback control.

Abstract: A nonlinear closed-loop control combined with an integral time-delay feedback control is disclosed to adjust a speed ratio of an infinitely variable transmission (IVT) system. A speed ratio control for an IVT system involves a forward speed controller and a crank length controller for different speed ranges. The time-delay control is designed to reduce speed fluctuations of the output speed of an IVT with an accurate speed ratio. The speed ratio of an IVT with the disclosed control strategy can achieve an excellent tracking response for the desired constant output speed and reduce speed fluctuations of the output speed of an IVT by the time-delay feedback control.

Abstract: Various implementations include loudspeaker drivers. In some aspects, an electro-acoustic driver includes: a cup section; a core section at least partially housed in the cup section, the core section including: a primary magnet; and a coin adjacent to the primary magnet; a bobbin surrounding the core section between the cup section and the core section, where the bobbin and the core section define an inner magnetic gap; a coil surrounding the bobbin and a portion of the core section; and a ferrofluid located at the inner magnetic gap, where the driver has an outer diameter less than or equal to approximately 10 millimeters.

Abstract: This invention relates to a fiber placement head integrating tow converging mechanism, comprising: fiber placement head mounting base; fixed yarn box component and revolving yarn box component arranged at the side end of the fiber placement head mounting base, tow passage formed between the revolving mounting face of the said fiber placement head mounting base and the relative face of the revolving yarn box component; tow conveying components respectively arranged on the sides of the fixed yarn box component and revolving yarn box component; and tow converging mechanism for guiding and converging tows conveyed by tow conveying components. Through appropriate design of guide pulley and tow passage, the fiber placement head realizes the guiding and converging of multiple tows, avoiding intervening among the tows.

Abstract: Methods, apparatus, systems, and articles of manufacture are disclosed for regulated hybrid converters. An example apparatus includes an input terminal; an output terminal, a first converter circuit coupled between the input terminal and an intermediate node, the first converter circuit having a first switch node, a second converter circuit coupled between the intermediate node and the output terminal, the second converter circuit having a second switch node; a first inductor coupled between the first switch node and the second switch node, and a second inductor coupled between the second switch node and the output terminal.

Abstract: A multi-stage hybrid Darrieus-modified-Savonius (HDMS) vertical axis wind or water turbine (VAWT) for aero-hydro energy harvesting. The HDMS VAWT can continuously harvest fluid energy, including wind and water energy, provides excellent self-starting capability, has enhanced structural stability, and a high energy harvesting efficiency.

Abstract: This invention relates to a cutter device for automated composite material placement equipment, including cutter component, drive mechanism that drives the cutter component to slide, and guide mechanism that provides slide room for the cutter component, the said guide mechanism comprises: cutter stop, base, cover plate arranged on the base, and cutting board arranged between the base and the cover plate; guide groove for accommodating cutter component slide is provided at the said base's contact side with the cutting board; the said cutter stop is arranged at the outer side of the guide groove to limit the cutter component from sliding out; the said cutting board has a protruding part relative to the base and the cover plate, a first tow guide hole is provided on the said protruding part; a second tow guide hole coaxial with the first guide hole is provided at the said cutter stop, a cutter avoidance groove is further provided at the said cutter stop's side close to the cutting board, and the second tow guide

Abstract: Methods, apparatus, systems, and articles of manufacture are disclosed for a dynamically adjustable gate driver for switching devices. An example power switching system includes a gate driver circuit including gate driver segments to adjust a transition time of a switch from a first time to a second time in response to a segment control signal, the transition time corresponding to a time to change a state of the switch, and a controller to obtain a first trip signal to indicate that a voltage exceeds a first threshold, obtain a second trip signal to indicate that the voltage is less than a second threshold, and transmit the segment control signal to the gate driver circuit when the switch is to change state and when the voltage exceeds the first threshold or is less than the second threshold.

Abstract: An apparatus includes first and second power converter stages, each stage having a primary side and a secondary side. The primary side of the first stage includes a switch T1A coupled to a voltage source and a switch T3A coupled to the switch T1A. The primary side of the second stage includes a switch T2A coupled to the switch T3A and a switch T4A coupled to the switch T3A and to the voltage source. The apparatus includes a control circuit to control an on/off time of the switches. The control circuit includes four gate driver controllers to control the on/off time of the switches and a current sharing control section to increase or decrease the on time of a switch based on a comparison of a current through one of multiple output inductors to an average current through the multiple output inductors.

Abstract: A fiber coil mounting device is used in automated composite material layup equipment. The fiber coil mounting device includes a fiber coil mounting shaft with axial hollow structure, a fiber stop plate disposed on two sides of the fiber coil mounting shaft, and an anti-slide fiber coil tightening mechanism. The anti-slide fiber coil tightening mechanism includes a piston assembly disposed inside the axial hollow structure, a spring piece disposed on the piston assembly, a driving unit controlling an axial slide of the piston assembly, and a tightening unit driven by an axial force produced by the spring piece during the axial slide of the piston assembly.

Abstract: This invention relates to a creel structure integrated on the fiber placement head of the automated placement equipment, comprising: fiber placement head mounting base, fixed yarn box component fixed and mounted on fiber placement head mounting base, and revolving yarn box component mounted on fiber placement head mounting base, the said revolving yarn box component is coupled with the fiber placement head mounting base through revolving shaft. This creel structure can avoid intervention that arise due to equipment maintenance and spindle replacement, making equipment maintenance and spindle replacement more convenient and swift.

Abstract: A fiber coil mounting device is used in automated composite material layup equipment. The fiber coil mounting device includes a fiber coil mounting shaft with axial hollow structure, a fiber stop plate disposed on two sides of the fiber coil mounting shaft, and an anti-slide fiber coil tightening mechanism. The anti-slide fiber coil tightening mechanism includes a piston assembly disposed inside the axial hollow structure, a spring piece disposed on the piston assembly, a driving unit controlling an axial slide of the piston assembly, and a tightening unit driven by an axial force produced by the spring piece during the axial slide of the piston assembly.

Abstract: This invention relates to a cutter device for automated composite material placement equipment, including cutter component, drive mechanism that drives the cutter component to slide, and guide mechanism that provides slide room for the cutter component, the said guide mechanism comprises: cutter stop, base, cover plate arranged on the base, and cutting board arranged between the base and the cover plate; guide groove for accommodating cutter component slide is provided at the said base's contact side with the cutting board; the said cutter stop is arranged at the outer side of the guide groove to limit the cutter component from sliding out; the said cutting board has a protruding part relative to the base and the cover plate, a first tow guide hole is provided on the said protruding part; a second tow guide hole coaxial with the first guide hole is provided at the said cutter stop, a cutter avoidance groove is further provided at the said cutter stop's side close to the cutting board, and the second tow guide

Abstract: This invention relates to a creel structure integrated on the fiber placement head of the automated placement equipment, comprising: fiber placement head mounting base, fixed yarn box component fixed and mounted on fiber placement head mounting base, and revolving yarn box component mounted on fiber placement head mounting base, the said revolving yarn box component is coupled with the fiber placement head mounting base through revolving shaft. This creel structure can avoid intervention that arise due to equipment maintenance and spindle replacement, making equipment maintenance and spindle replacement more convenient and swift.

Abstract: This invention relates to a fiber placement head integrating tow converging mechanism, comprising: fiber placement head mounting base; fixed yarn box component and revolving yarn box component arranged at the side end of the fiber placement head mounting base, tow passage formed between the revolving mounting face of the said fiber placement head mounting base and the relative face of the revolving yarn box component; tow conveying components respectively arranged on the sides of the fixed yarn box component and revolving yarn box component; and tow converging mechanism for guiding and converging tows conveyed by tow conveying components. Through appropriate design of guide pulley and tow passage, the fiber placement head realizes the guiding and converging of multiple tows, avoiding intervening among the tows.

Abstract: A solid piston having a closed shape is attached to a solid support surrounding the piston and corresponding in shape to the shape of the piston by a layer of compliant material adhered to a top surface of the piston and a top surface of the support. The layer of compliant material includes an open central area exposing the top surface of the piston through the open area. An assembly for an electroacoustic transducer includes a piston, which is an elliptical plate of silicon having a flat top surface and serving as the diaphragm, an elliptical support ring of silicon surrounding the piston and separated from the piston by a gap, and a layer of compliant material adhered to a top surface of the support ring and to the top surface of the piston, suspending the piston in the gap. An elliptical or cylindrical motor is coupled to the piston.

Abstract: An apparatus includes first and second power converter stages, each stage having a primary side and a secondary side. The primary side of the first stage includes a switch T1 A coupled to a voltage source and a switch T3A coupled to the switch T1 A. The primary side of the second stage includes a switch T2A coupled to the switch T3A and a switch T4A coupled to the switch T3A and to the voltage source. The apparatus includes a control circuit to control an on/off time of the switches. The control circuit includes four gate driver controllers to control the on/off time of the switches and a current sharing control section to increase or decrease the on time of a switch based on a comparison of a current through one of multiple output inductors to an average current through the multiple output inductors.

Abstract: A loudspeaker includes an acoustic diaphragm, an oscillatory force source, a lever coupling the oscillatory force source to the acoustic diaphragm, and a pivot coupled to the lever such that the lever moves in an arcuate path about the pivot when the oscillatory force source applies a force to the lever. The pivot includes at least one torsion bushing. The at least one torsion bushing includes a first member, a second member coupled to the lever and movable relative to the first member, and an elastomeric member coupling the first member to the second member. Either the first member or the second member is coupled to and moves with the lever. An outer surface of the elastomeric member is coupled to the second member via mechanical compression.

Abstract: This invention relates to an active control system for a variable electromotive-force generator (VEG) for use in wind turbines, ships, hybrid vehicles, and related applications.

Abstract: A load can be applied to a beam and a property of the load can be calculated. In one example, a first shear gauge can be configured for positioning on a neutral axis of a beam on one side of a force that the beam is subjected to. Similarly, a second shear gauge can be configured for positioning on the neutral axis of the beam on an opposite side of the force to the first shear gauge. A calculator can be configured to identify a characteristic of the force through use of an output of the first shear gauge and through use of an output of the second shear gauge.