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370results about How to "Increase or decrease the number" patented technology

Array-type novel high-performance eddy current damper

InactiveCN102797786ACompact structureHigh damping force to damper mass ratioMagnetic springsShock absorbersElectricityEngineering
An array-type novel high-performance eddy current damper consists of an electrical eddy current energy consuming unit, an elastic buffer unit, an electromagnetic shielding component, an axial displacement guiding unit and a supporting component, wherein the elastic buffer unit, the electrical eddy current energy consuming unit and the axial displacement guiding unit are sequentially inlaid on the supporting component from the bottom up; the bottom of the electrical eddy current energy consuming unit serving as a core component of the damper is connected with the top of the elastic buffer unit; the top of the electrical eddy current energy consuming unit is connected with the bottom of the axial displacement guiding unit; a flexible spherical hinged support is arranged at the top end of the damper and is connected with the axial displacement guiding unit and an external load to output a damping force; and a flexible spherical hinged support is arranged at the bottom end of the damper and is used for fixing the damper. The array-type novel high-performance eddy current damper has the advantages of adjustable damping coefficient, high ratio of the damping force to the integral mass of the damper, compact structure, high reliability and the like; and in the technical field of structural vibration control, the array-type novel high-performance eddy current damper has relatively high practical value and wide application prospect.
Owner:BEIHANG UNIV

Sampling rate conversion device and sampling rate conversion method with bandwidth being continuously variable

The invention discloses a sampling rate conversion device and a sampling rate conversion method with the bandwidth being continuously variable. The sampling rate conversion device comprises an upper sampling rate conversion unit and a lower sampling rate conversion unit, wherein the upper sampling rate conversion unit comprises a shaping filter, an integral multiple interpolation module A, a fractional multiple interpolation module A, a DAC (digital-to-analog converter) and a control module A, the shaping filter receives a sequence to be sent, and the sequence to be sent is sequentially processed by the integral multiple interpolation module A, the fractional multiple interpolation module A and the DAC and then outputted, the lower sampling rate conversion unit comprises an ADC (analog-to-digital converter), a fractional multiple interpolation module B, an integral multiple extraction module B, a matched filter and a control module B, signals of a receiving end are inputted into the ADC, the signals are sequentially processed by the fractional multiple interpolation module B, the integral multiple extraction module B and the matched filter and then outputted, and the control module controls the integral multiple interpolation times, the integral multiple extraction times and the fractional multiple interpolation times. According to the invention, the hardware resource occupation rate is low, the number of half-band filters can be increased or decreased according to a relation between a target sampling rate and an input signal symbol rate, thereby adapting to sampling rate conversion processing of any signals with the bandwidth being variable.
Owner:成都国恒空间技术工程股份有限公司

Electro-deionization method and device for synchronously concentrating and purifying heavy metal wastewater

The invention relates to an electro-deionization method and device for concentrating and purifying heavy metal wastewater synchronously, belonging to a wastewater treatment technique, which adopts first-stage two-section or first-stage multi-section electro-deionization device, wherein the inner sides of the positive and negative poles are arranged with corresponding pole protection chambers, the desalting chamber is filled with large-hole strong-acid strong-base mixed bed resin with narrow particles distributed; cation exchange film is adopted as the direction-turning film, after direction-turning, two adjacent concentration chambers are arranged continuously, both are separated by cation exchange film, simultaneously after direction-turning, the first concentration chamber is filled with large-hole mixed bed resin with the volume of cathode resin more than 50 percent, the heavy metal wastewater to be treated enters the desalting chamber and the concentration chamber in two paths, the heavy metal ion and cathode in the desalted water flow are transferred into the concentration chamber so as to obtain the desalted water, the concentrated water flow is partially circulated or closely circulated so as to obtain the concentrated liquid of metal wastewater, thereby recycling valence metals and pure water resources synchronously and realizing zero emission and resource treatment of wastewater. Compared with the prior art, the wastewater treatment process has higher separation efficiency, more reliable operation, more convenient operation, continuous process operation and no secondary pollution.
Owner:NANKAI UNIV

Voltage sag generation device and control method and device for inverter

The embodiment of the invention discloses a voltage sag generation device and a control method and a control device for an inverter. The generation device comprises a modular multi-level rectifier and a modular multi-level inverter, wherein the modular multi-level rectifier is connected with the modular multi-level inverter in a back-to-back power transmission connection manner, and the structures of the modular multi-level rectifier and the modular multi-level inverter are the same; each of the modular multi-level rectifier and the modular multi-level inverter comprises three phase units which are connected in parallel with one another; each phase unit consists of two bridge arms which are connected in series with each other; any bridge arm consists of N sub modules SM and a valve reactor which are connected in series; and each SM consists of two insulated gate bipolar transistor (IGBT) switching devices and a direct current energy storage capacitor which are connected in parallel. The device can precisely control a voltage sag depth, lasting time, a phase and a sag type and can be easily expanded to high voltage and high power grade; requirements on high voltage and high power are met; a requirement on the switching devices is low, and the switching devices are easy to purchase; the price is low; an output waveform is relatively high in quality; and the number of filters on an alternating current side is reduced.
Owner:CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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