169results about How to "Improve imbalance" patented technology

A vibration damper for a tubular propeller shaft in the drive train of a motor vehicle having a mass body mounted concentrically, in the propeller shaft or in a sleeve attached in the propeller shaft, by way of at least one rubber spring element. Metal and/or flexible rubber stop elements that limit the vibration travel of the mass body at least in the radial direction are arranged between the mass body and the sleeve. Alternatively, the mass body and/or the sleeve are configured at least locally, in mutually opposite regions, as stop elements that limit the vibration travel of the mass body at least in the radial direction.

The invention relates to a dynamic loss reduction method for a distribution network and a synthesized loss reduction system of a distribution network. A principle that an electric field and a magnetic field are mutually symbiotic and affected is applied for dynamically realizing electromagnetic balance; the treatment of'peak load shifting'is carried out on the current difference value between three-phase unbalanced currents caused by the dynamic unbalance of the power used by a three-phase load at the secondary side of a distribution transformer so as to lead the current difference value to approach balance, reduce a zero sequence current and the unbalance degree of the three phases, and restrain a harmonic, thereby realizing the self loss (loss on transmission) of the distribution transformer and the line loss (the copper loss of the line) at the first side and the secondary side of the distribution transformer; the synthesized loss reduction system of the distribution network realizes the synthesized loss reduction management of the distribution network, the loss on transmission of the distribution transformer as well as the automatic measuring and accounting on the data of the copper loss of the line at the first side and the secondary side thereof; the system also realizes the remote automatic collection on the power data of the distribution transformer in the same time as well as the accounting of the line loss of a distribution line, calculates and accounts the line loss of the distribution network, calculates and analyzes the loss reduction as well as analyzes the benefits of energy saving and emission reduction.

The present invention relates to an underwater propelling device (10) i

• • a stator (20) comprising circumferential arrayed coils (35) and being adapted to generate a controlled electromagnetic field along an axial direction,
  • a shaftless propellant rotor (30) comprising:
    • at least two magnetized ring-shaped plates, respectively an upper magnetized plate (31) and a lower magnetized plate (32), coaxially spaced-apart along said axial direction and perpendicular thereto such that said circumferential arrayed coils (35) are positioned therebetween, each plate (31, 32) defining a central aperture (31a, 32a) and having a circumferential array of radially extended magnetized poles (34) embedded therein, said magnetized poles (34) generating a magnetic field which interacts with the electromagnetic field of the stator (20) so as to cause the rotation of said plates (31, 32) about a central axis (ZZ′) parallel to said axial direction,
    • at least one ring-shaped propeller (33) defined by its outer periphery and its inner periphery, said propeller being received inside the central apertures (31a, 32a) of said plates (31, 32) and fixedly secured thereto,
    • a plurality of propeller blades (35) projecting inward from the inner periphery of said propeller (33), said blades (35) producing a thrust along the central axis (ZZ′) when the plates (31, 32) rotate,

wherein the rotor (30) is axially separated from the stator (20) by a gap, preferably less than 3 mm, so as to permit the formation of a hydraulic film inside said gap, said hydraulic film being adapted to provide lubrication of the rotor, thus reducing friction between the rotor and the stator, and to transmit the axial thrust force of the rotor to the stator.

The invention discloses a system for compensating the combined negative sequence current of a power regulator and a static var compensator. The system consists of a railway power regulator and the static var compensator. The railway power regulator is installed between two power supplying arms at a secondary side of a traction transformer by two single-phase three-winding reducing transformer. Thestatic var compensator consists of two groups of thyristor switched capacitors which are connected in parallel and a group of thyristor controlled reactors. The thyristor switched capacitors and thethyristor controlled reactors are respectively connected with two traction power supplying arms by single-phase three-winding reducing transformers, wherein the thyristor switched capacitors are installed below the single-phase three-winding reducing transformer which is connected with the power supplying arms with relatively advanced voltage phases, and the thyristor controlled reactors are installed below the single-phase three-winding reducing transformer of the power supplying arms with relatively hysteretic voltage phases. The system can maximally reduce the capacity of the railway powerregulator while also satisfying the requirement of a railway system on the unbalancedness degree of three phase current.

The invention relates to a construction method for a classifier. The construction method includes the following steps that a part of majority class training samples in a training sample set are removed through an undersampling method, and a current training sample set is updated through the undersampled training sample set, wherein the training sample set comprises the majority class training samples and minority class training samples, and the classes of all the training samples in the training sample set are known; oversampling is conducted on the minority class training samples in the training sample set, and the classifier is constructed through the oversampled training sample set. According to the construction method for the classifier, noise in the training samples is removed effectively, the problem of data imbalance can be solved effectively, the accuracy rate of training sample data classification is greatly increased, the calculation amount is small, and the method is simple.

The invention discloses a battery pack electricity equalization circuit. The battery pack electricity equalization circuit comprises N-1 battery equalization unit circuits, N voltage sampling circuits, an auxiliary power module, a single-chip microcomputer control module and a driver module, wherein the Kth voltage sampling circuit and the (K+1)th voltage sampling circuit acquire a voltage at two ends of a Kth battery and a voltage at two ends of a (K+1)th battery, and transmit the voltages to the single-chip microcomputer control module; the single-chip microcomputer control module outputs a driver signal to the driver module according to the voltages; the driver signal output by the driver module is transmitted to the Kth battery equalization unit circuit; and the Kth battery equalization unit circuit controls the Kth battery to be discharged and the (K+1)th battery to be charged or controls the Kth battery to be charged and the (K+1)th battery to be discharged, so that electricity equalization of the Kth battery and the (K+1)th battery can be achieved, wherein K is greater than or equal to 1 and less than or equal to N-1. According to the equalization circuit and method, the equalization circuit is simple in structure, high in conversion efficiency, low in cost and high in reliability, and can expand the available capacity of a battery pack and prolong the service life of the battery pack.

An improved high performance twisted pair data cable having a calculated impedance standard deviation of less than 3.5 at an average impedance of 50 to 200 ohms and a maximum of 90 to 110 ohms. The twisted pair is helically wrapped with metal shielding tape under a certain tension, which provides a shielded twisted pair with a cross-sectional void of less than 25%, preferably less than 18%. The tape is helically wrapped with an overlap of 30-45% and at 35-45 degrees to the longitudinal axis of the cable. This cable has a frequency up to 600MHz.

A method and apparatus for increasing the capability of a network topology model having a plurality of nodes connected by existing links to maintain service continuity in the presence of faults. The steps of the method include adding new links to the network topology model to protect against single node failures, and adjusting link weights for the network topology model to reduce at least one of a cost of network operation and an imbalance in link utilizations. Preferably, the link weights are adjusted to reduce the imbalance in link utilizations without deteriorating the cost of network operation. The link weights are preferably adjusted to reduce the cost of network operation without increasing the imbalance in link utilizations. Preferably, the link weights are adjusted to reduce the cost of network operation without increasing the imbalance in link utilizations while keeping the utilization for each link below a specific threshold. In addition, links can be added to the network topology model to reduce the cost of network operation.

The present invention discloses a bidirectional lossless equalization circuit of a series battery pack based on inductive energy storage, wherein, the series battery pack is divided into an upper part and a lower part, the upper half part battery is an upper battery pack, and the lower half part battery is a lower battery pack. Each battery connects an equalization branch circuit, a total equalization branch circuit bestrides and connects a power supply and the earth, and each equalization branch circuit connects a control circuit. The circuit can realize a dynamic equalization during the charge-discharge process of the battery pack, improve a non-equalization phenomenon of the series battery pack, improve an available capacity of the battery pack, reduce a repairing and replacing cycle of the series battery pack, and prolong a service life of the battery pack by controlling the on and off of an upper bridge and a low bridge MOSFET in the equalization branch circuit and the inductive energy storage. Thus, the circuit is suitable for a battery management system of an energy storage device of a hybrid electric vehicle, a pure electric vehicle, or a storage power station.

The invention discloses a method for restraining total output active power fluctuation of a double-fed wind power system through a series-connection network side converter under an unbalanced and harmonic distortion network voltage and relates to the field of control over series connection network side converters, parallel connection network side converters and motor side converters. A voltage controller adopted for the series connection network side converter can be used for rapidly restraining stator negative-sequence harmonic voltage components, five-time harmonic voltage components and seven-time harmonic voltage components and safe and stable operation of an electric generator is guaranteed. A reference current order of a parallel connection network side converter comprises fundamental harmonic positive-sequence current components, fundamental harmonic negative-sequence current components, five-time harmonic current components and seven-time harmonic components under a forward-direction synchronous revolution coordinate system. A current controller adopted for the parallel connection network side converter can simultaneously, accurately and rapidly adjust direct components, second harmonic generation alternating components and sixth harmonic generation alternating components. Total output active power second harmonic generation fluctuation and sixth harmonic generation fluctuation of the system can be guaranteed and the electric energy quality and stability of a power grid connected to the double-fed sensing wind power system are effectively improved.

The invention belongs to the technical field of a semiconductor, in particular relates to a junction terminal structure of a transverse high-voltage power device. In the structure, the inner wall of an N-type shift region 2 and the inner wall of a P-type buried layer 9 in a curvature junction terminal structure respectively extend to the middle until to be connected with the inner wall of an N-type shift region 2 and the inner wall of a P-type buried layer 9 in a direct junction terminal structure, included angles of Alpha degrees are generated between the extension directions and the vertical directions of the inner walls of the N-type shift region 2 and the P-type buried layer 9 in the direct junction terminal structure, and the Alpha degrees is 45 degrees. By the junction terminal structure, the curvature effect of an electric field at a connection part can be effectively relieved; and on the vertical direction of the extension direction at the connection part, the distance of the P-type buried layer 9 exceeding the N-type shift region is 5 micrometers, and thus, the problem of charge unbalance is solved. The junction terminal structure has the advantages that the problems of charge unbalance in the connection part between the direct junction terminal structure and the curvature junction terminal structure and the curvature effect of the electric field at the connection part are solved, a device is prevented from being broken down in advance, and thus, optimal breakdown voltage is obtained.

The invention relates to a method for realizing broadcast channel covering by an antenna array, which is used in a smart antenna system, the method includes the following steps that: step 1. according to the coverage condition of communities/sectors, the steering of the antenna array broadcast beam and the half power width of the broadcast beam are calculated; step 2. the broadcast beam steering is takn as a center, N sub-beams (N is a natural number) with symmetric steering are set up according to the calculation results; step 3. on the basis of the interval of transmission time or the integral multiple of the transmission time, broadcasting channel information is emitted by adopting the N sub-beams. The invention can acquire higher beam gain, modify the disequilibrium of the coverage area for broadcast channels and dedicated channels, and promote the network performance of the system.

The invention discloses a non-polar patterned AlN/sapphire composite substrate and a manufacturing method thereof. The structure thereof comprises a r-plane patterned sapphire substrate, a sapphire pattern, a mask layer and an AlN covering layer. The sapphire pattern is a part of the r-plane patterned sapphire substrate, and is an asymmetric conical or pyramidal structure, that is, inclines towarda [1101] crystal orientation. The structure can effectively solve a problem that crystal quality is difficult to improve since growth rates along different directions are different during epitaxial growth of non-polar III-nitride. The AlN covering layer is formed by direct reaction with NH3 while the sapphire substrate is decomposed under high temperature in an NH3 atmosphere. The composite substrate provided by the invention can effectively reduce combination of O-containing impurities in an epitaxial growth process of the III-nitride, and can also obtain a dense high-quality non-polarity AlN covering layer on the surface of the sapphire substrate on the premise of not consuming an Al source, and has important significance on growing the high-quality non-polar III-nitrides and related devices on the substrate.

The invention discloses a transformer fault type diagnosis method based on a semi-supervised DBNC (deep belief network classifier). The method comprises the following steps: selecting a sample data set; dividing sample data into an unlabelled pre-training set, a labelled set, a test set 1 and a test set 2; performing state coding on a fault type; building a DBNC-based transformer fault diagnosis model; initializing parameters of each layer of the model; training each RBM at the bottom layer by layer by utilizing comparison divergence; optimizing the whole network parameter through back propogation, so as to enable network classification performance to be globally optimal; and storing a trained network, and verifying classification performance of a network by utilizing sample data of the test set 1. The method disclosed by the invention solves the problems that only a small amount of complete data samples can be obtained under normal conditions when deep learning network fault data is adopted for performing analysis and processing in transformer fault diagnosis, a large number of labelled complete data samples are very difficult to acquire and a large amount of manpower and resources are required.

An image forming apparatus, comprises an image forming section; a pair of fixing members coming in pressure contact with each other so as to form a nip portion and to fix a toner image on a sheet conveyed from the image forming section with the nip portion; an oscillating section to oscillate the fixing members in a width direction perpendicular to a sheet conveying direction; an inclining section to incline the fixing members to the width direction in parallel to a conveyance surface; and a control section to control the oscillating section and the inclining section such that when a sheet is passing through the nip portion, a direction of a one-sided oscillation shift of the sheet due to the oscillation of the fixing members is made opposite to that of a one-sided inclination shift of the sheet due to the inclination of the fixing members.

The invention relates to a human body daily behavior activity recognition optimization method based on a stacked noise reduction auto-encoder, which comprises the following steps: 1) based on a deep learning method and an SDAE model, constructing a classification model of human body behavior recognition by adopting human body behavior data acquired from a wearable sensor; 2) initializing a classification model for the data collected by the wearable sensor, and dividing the initialized data into a training set, a test set and a verification set; 3) carrying out pre-training and fine tuning processing on the constructed classification model; and 4) verifying the generalization ability of the trained classification model by using the verification set in a cross verification mode, and inputting the test set into the classification model to obtain the corresponding prediction category. Compared with the prior art, the method has the advantages that a more accurate model identification result is obtained, more directions can be provided for the application of behavior identification, and the like.

The invention discloses a probiotic solid beverage capable of relieving or treating constipation. The probiotic solid beverage contains strains which are good in safety and have probiotic characteristics: Bifidobacterium anaticum subsp. Lactis V9 and Bifidobacterium lactis M8. Clinical population tests show that the probiotic solid beverage can improve the excrement state of constipation patients,increase the defecation frequency and effectively regulate intestinal flora, and has a good effect on relieving constipation symptoms.