14 results about "Sinusoidal waveform" patented technology

A method is provided for reducing common mode voltages in a system that includes an inverter connected to a motor by a long cable by controlling switches of the inverter to generate voltage vectors that emulate a three-phase sinusoidal waveform by switching between adjacent active vectors and active vectors that are separated by 180 degrees, determining whether a phase angle of the vectors is increasing or decreasing, determining a decision angle within the sector which is a function of a duty cycle offset and a modulation index; and applying duty cycle manipulation rules, including: responding to an increasing phase angle that is less than the decision angle by setting a duty cycle of the adjacent active vectors to a duty cycle high value; and responding to an increasing phase angle that is greater than 60 degrees minus the decision angle by setting the duty cycle to a low value.

The present disclosure provides a RF power delivery method for delivering the RF power to a plasma load in a microelectronic manufacturing environment. The RF power delivery method includes generating a harmonically distorted sinusoidal waveform. Such harmonically distorted sinusoidal waveform being derived from a predetermined harmonic signature corresponding to a desired plasma state. Next, the method includes amplifying the harmonically distorted sinusoidal waveform and capable of operating under conditions of high reflected power. Next, the method includes interfacing with a non-linear plasma load impedance. Thereafter, the method includes measuring the RF power spectrum at an output of the fixed impedance matching network, the measured spectrum being used to adjust the amplified harmonically distorted sinusoidal waveform to recreate a desired plasma state.

The application provides a power measurement device and method based on an analog quantum voltage source. The first standard voltage source in the power measurement device is an analog quantum voltage source and is used to generate a first standard quantum voltage in a sinusoidal waveform. The second standard voltage source is an alternating quantum voltage source and is used to output a second standard quantum voltage in a sinusoidal step wave. In the case where the other end of the switch is connected to the second standard voltage source, the processor adjusts the first standard quantum voltage based on the second standard quantum voltage. In the application, the standard quantum voltage of the alternating quantum voltage source is transmitted to the analog quantum voltage source. The pure sinusoidal wave signal of the analog quantum voltage is conducive to reducing the difference value of the power difference sampling, realizing continuous measurement, reducing the requirement for the stability of the power source, and realizing a double-pass analog quantum voltage source, and simplifying the differential measurement control of the voltage and the current in different phases.

The application discloses a morphological super-drilling offshore rock-embedded single pile foundation and a construction method, and belongs to the technical field of offshore engineering. In view of the problems of single geometric form, synchronous brittle failure and insufficient bearing capacity of the interface of the existing rock-embedded pile, a morphological super-drilling area in the shape of a sinusoidal wave curved surface is formed below the pile body, and the area is filled with a material to be integrated. The construction steps include: drilling construction; a sinusoidal wave curved surface is formed by adopting high-pressure water jet and variable-diameter mechanical cutter compound cutting, the contour accuracy is ensured to be less than or equal to 5 mm through a laser ranging camera and closed-loop control; primary positive circulation hole cleaning and secondary air-lift reverse circulation combined high-pressure water jet hole cleaning are sequentially implemented; after the hole cleaning is qualified, primary self-leveling grouting, secondary high-pressure splitting grouting and tertiary steady pressure supplementary grouting are implemented. The shear dilation effect and asynchronous failure mechanism of the sinusoidal wave curved surface make the vertical bearing capacity of the rock-embedded pile be 2 to 12 times higher than that of the traditional rock-embedded pile, the failure mode is ductile, the construction consistency is good, and the construction cost of the deep-sea rock-embedded pile is reduced.

The utility model discloses a kind of damping enamel steel plate structures, including damping core layer, damping core layer includes intermediate rubber pad and the metal grid plate of bonding in the front and rear sides of intermediate rubber pad, intermediate rubber pad has honeycomb hole;Transition steel plate is respectively fixed on the front and rear surfaces of damping core layer;Waveform substrate is respectively welded on the surface of transition steel plate, waveform substrate has the wave part located in the center and the edge part located in four periphery, waveform part is set as sine wave, has wave crest and wave trough, transition steel plate is welded in wave trough, edge part is mutually welded by aluminum beam, multiple assembly holes are provided on aluminum beam;Polyurethane lining is filled between transition steel plate and wave crest;Wherein, waveform substrate surface is sprayed with enamel layer.The utility model is combined by the intermediate rubber pad of damping core layer and metal grid plate, cooperate the sine wave design of waveform substrate, can efficiently absorb vibration energy;Polyurethane lining filling enhances the structural integrity, auxiliary promotes damping effect.

This invention discloses a liquid filter element, comprising a filter element and a supporting cylinder. The filter element is tubular, and its shape is a consistent and continuous sine wave on any cross-section of the tubular axis. The filter element has several micropores. The filter element is integrally formed. The supporting cylinder is fitted onto the filter element. This invention, by fabricating the filter element into an annular corrugated tubular shape, can significantly improve the flow-to-volume ratio of the corresponding filter and reduce its volume. By fitting the supporting cylinder onto the entire outer cylinder of the filter element and welding them at the tangent point, the filter element has good structural strength and rigidity. The shape and dimensional error of each corrugation in the filter element can reach the IT11 standard tolerance value. It not only has high pressure differential resistance but also allows for the provision of a backwash suction port on the inlet surface that closely matches the annular sine wave of the filter element, enabling precise control of backwash short circuits. This filter element is used in the water filtration industry and can also be used as a filter element for viscous fluids and mining emulsion filters.

A voltage controller detects a voltage spike in an electrical signal received from an electrical power source. The voltage controller is implemented using a single-loop control system in a stationary reference frame. The electrical signal includes voltage harmonics caused by a non-linear or unbalanced load. The voltage controller includes a phase-compensated harmonic regulator that regulates the voltage harmonics present in the electrical signal and receives a feedback voltage of the single-loop control system. The feedback voltage is a delayed version of an instantaneous voltage of the electrical signal. The instantaneous voltage is sub-transiently stabilized into a steady-state voltage based on the feedback voltage. Sub-transiently stabilizing the instantaneous voltage is performed within a single cycle after the voltage spike is detected. The steady-state voltage has a total harmonic distortion less than a threshold total harmonic distortion and the steady-state voltage has a balanced sinusoidal waveform.

A nanosecond pulser system is disclosed. In some embodiments, the nanosecond pulser system may include a high voltage power supply; a nanosecond pulser electrically coupled with the high voltage power supply and switches voltage from the high voltage power supply at high frequencies; a transformer having a primary side and a secondary side, the nanosecond pulser electrically coupled with the primary side of the transformer; and an output electrically coupled with the transformer producing a waveform. In some embodiments, the waveform includes a plurality of high voltage pulses having a pulse amplitude greater than about 2 kV, a pulse width, and a pulse repetition frequency; and a sinusoidal waveform having a waveform frequency and a waveform amplitude greater than 100 V.

A stimulator circuit comprises: a stimulation signal generating unit configured to generate a stimulation signal and provide the stimulation signal to an output wherein the stimulation signal is an alternating current, AC, signal having a sinusoidal-like waveform; and a compensation unit configured to generate a compensation current signal, wherein the compensation unit comprises a common mode voltage monitoring element configured to monitor a common mode voltage based on the stimulation signal, and a charge balancing element configured to generate the compensation current signal based on the common mode voltage; wherein the compensation unit is configured to provide the compensation current signal to the output for compensating an unbalanced charge of the stimulation signal and forming a compensated stimulation signal at the output.

A cutting tool positioning method, applicable for a chain-type tool magazine with a plurality of tool holders and a base, includes performing distance sensing along a sensing direction toward the plurality of tool holders, obtaining a time-sequential waveform signal corresponding to a continuous time period based on sensing data acquired by the distance sensing, converting the time-sequential waveform signal into a sinusoidal waveform signal, and determining a position offset of each of the plurality of tool holders according to a plurality of measured peak positions of the sinusoidal waveform signal and a plurality of preset peak positions. A cutting tool positioning device, applicable for a chain-type tool magazine comprising a plurality of tool holders and a base, includes a distance sensor and a signal processing device, wherein the distance sensor is disposed at the base, and the signal processing device is connected to the distance sensor.

The present invention relates to a safety sheath for a telegraph pole corrosion prevention, which can secure safety of drivers and pedestrians by being installed on a telegraph pole and prevent corrosion of the telegraph pole. That is, the present invention is characterized by comprising a bottom plate part (10) formed in a sine wave curved surface (12) having inwardly curved parts (12a) and outwardly curved parts (12b) alternately repeated on an inner circumferential surface thereof; an identification band part (20) formed on a surface of the bottom plate part (10) by different colors alternately repeated; side plate parts (30) formed at both ends of the bottom plate part (10) and having hook holes (32) formed therein; and a fastening strip (40) provided with a plurality of hook pieces (42) in a manner to be inserted into and coupled to the hook holes (32) of the side plate parts (30). If the safety sheath for a telegraph pole corrosion prevention is used, a non-contact ventilation flow path is formed between the safety sheath and the telegraph pole to prevent corrosion of the telegraph pole due to moisture, and since the identification band part (20) is formed by using colored plastic and by double extrusion molding, the effect of excellent weather resistance and long-term maintenance of identification is obtained.