33 results about "Near fault" patented technology

The invention discloses a protection method for loop network with at least two nodes. Wherein, every node links on loop by the first and second loop ports; all loop ports interconnect on link layer and connect at least one other port of all nodes on network layer. This method comprises: setting the link layer transmission of loop port as broadcast means; when there is fault on loop network, two normal-working nodes near fault point turn the loop port connected to fault point to another loop port. This invention needs not to update transmission list and fault notice for fault recovery, has no primary and auxiliary nodes and ports as well as clogging port, and realizes the fast recovery and switch less than 50ms.

The invention mainly discloses a pulling-resistant bidirectional sliding friction bearing applied to the field of bridge, flume and building engineering. The bearing comprises upper and lower bearing plates, upper and lower sliding blocks, a pulling-resistant system and a limiting pulling-resistant device, wherein the upper sliding block and the lower sliding block can horizontally slide on the upper bearing plate and the lower bearing plate respectively; and a pulling-resistant disc is embedded into a pulling-resistant spherical segment. In the state of a normal load and a small earthquake, the rotation between the pulling-resistant disc and the pulling-resistant spherical segment of the bearing adapts to that of an upper structure under the temperature and the normal load; in the state of a big earthquake, the vibration cycle of a structure system can be changed and the partial earthquake energy can be dissipated by the sliding movement of the sliding block so as to reduce the earthquake response of the upper structure; the pulling-resistant system can be used for preventing the upper structure from being overturned or collapsed due to a pulling force with the control effect caused by larger vertical ground motion component under the action of a near field and a near-fault earthquake; and the bearing is strong in pulling-resistant capability and good in durability, has a definite seismic mitigation and absorption mechanism, and is suitable for various structures such as bridges, flumes, buildings and the like with high seismic performance requirements.

The present invention belongs to the field of relay protection technology for electric power system. Based on the characteristic that the small scale wavelet conversion waveform of current traveling wave has its main part far from the time axis while voltage zero-cross failure and near to the time axis normally, phase-analog conversion matrix T is used in calculating three line mode traveling waves and their energy, one line mode traveling wave with maximum energy is selected for wavelet conversion, and the number of the points with values exceeding the maximum Kw is calculated to judge whither to have zero-cross failure. The present invention provides reliable and effective method capable of separating zero-cross failure from other failures.

The invention provides a shearing energy dissipation type shock insulation layer limiting device, and belongs to the field of engineering structure seismic isolation and energy dissipation seismic mitigation. Elastic anti-collision damping material (6) is bonded to a side anti-collision plate (5) which is perpendicularly fixed to a shearing steel plate (3), two sides of the shearing steel plate (3) are bonded to damping material layers (2), an upper connecting steel plate (1) is bonded to the damping material layer (2) on the upper side, a lower connecting steel plate (4) is bonded to the damping material layer (2) on the lower side, the lengths of the upper connecting steel plate (1) and lower connecting steel plate (4) are both larger than the length of the damping material layers (2), shearing screws penetrate the upper connecting steel plate (1) and the lower connecting steel plate (4), and the other ends of the upper connecting steel plate (1) and lower connecting steel plate (4) are connected to a limiting baffle (8). By the aid of the device, safety of a base isolation system under the action of near-fault earthquakes is improved.

The invention provides a near-fault non-stationary seismic oscillation simulation method based on data driving. Initially a near-fault non-stationary seismic oscillation record is decomposed into superposition of a series of mono-component signals by means of SWT, then Hilbert transform is conducted on each order of the mono-component signals, and simulation of a non-stationary seismic oscillation sample is achieved through introduction of random variables and by means of a signal reconstruction technology. By means of the method, a redundant wavelet base function is used, representation of original signals on the redundant base function can be seen as the average of representation of the signals on a series of base functions, wavelet coefficients and scale coefficients have equal length with the original signals, the translation invariance is ensured, not only can the oscillation effect of dyadic wavelet transform be well inhibited, but also disturbance of part of the wavelet coefficients cannot result in severe distortion of the signals, so that dependence of the reconstruction effect of the signals on single wavelet coefficient is reduced, thus the SWT has a better advantage over the aspects of seismic wave decomposition and reconstruction, and the precision of sample simulation is ensured.

The invention relates to a near-fault seismic acceleration time-history fitting method capable of representing ground permanent displacement. The method comprises the following steps: forming an initial seismic acceleration time history, carrying out first baseline adjustment on initial seismic oscillation, extracting second baseline correction parameters of the seismic acceleration time history,carrying out multi-target-based seismic acceleration time history adjustment, evaluating target parameters and the like. The near-fault seismic acceleration time history fitting method capable of representing the ground permanent displacement is adopted; the seismic acceleration record obtained by the method can meet the requirements of an acceleration response spectrum and peak acceleration, canreflect the characteristics of near-fault seismic oscillation velocity pulses, can represent the permanent displacement of the ground, and can provide input data of a seismic acceleration travel withextremely high reference during aseismic design.

The invention belongs to the technical field of engineering structure seismic isolation, and particularly relates to a three-dimensional and high-energy-consumption damping supporting base based on shear thickening fluid. The three-dimensional and high-energy-consumption damping supporting base comprises an upper support unit, a horizontal seismic isolating assembly and a lower support unit which are connected separably. A supporting bottom plate and hollow supporting columns are arranged on the lower support unit, the upper support unit and the lower support unit are combined to form a sealed cavity, and the horizontal seismic isolating assembly is arranged in the sealed cavity. Compared with a traditional seismic isolation base, shear thickening characteristics of the friction material and STF are comprehensively used in the technical scheme, a protected engineering structure has the seismic isolation effect in the horizontal direction and the vertical direction, the supporting base is suitable for seismic actions including near-fault long-periodic seism and displacement pulse under any condition.

The present invention discloses a fault information collection and transmission method of a motor control system. The method comprises the steps that: according to a preset time sequence, sampling offault information, being synchronous to motor real-time control, near fault points and asynchronous transmission of fault information are achieved, wherein when sampling of the fault information nearthe fault points is performed, and a buffering area is arranged to perform data buffering of the fault information and to perform data forwarding through the buffering area when the fault informationis transmitted. In a condition without changing a current bus system, a low-speed network can be also used to effectively perform diagnosis of the fault of the real-time motor control system, and thesampling of the fault information is synchronous to the motor real-time control cycle to distinguish the successive sequence of generation of the faults so as to improve the analysis accuracy of faultpositioning.

The invention provides an adjustment method for matching of near-fault artificial seismic waves and a standard reaction spectrum. A calculation reaction spectrum is unfolded and decomposed into multiple layers, an optimized algorithm is used to carry out adjustment and wavelet reconstruction on coefficients which need adjusting, the standard reaction spectrum is matched rapidly in high efficiency,the calculation reaction spectrum matches the standard reaction spectrum more, and the Volterra level is zoomed in/out to improve the matching precision and calculation efficiency. Anti-seismic analysis can be carried out on an engineering structure, analysis on the anti-seismic design and structural power is more accurate and effective, a bridge design capability is optimized, a bridge safety coefficient is improved, the service life is prolonged, damage after seismic is reduced, maintenance cost after seismic is reduced, the matching difficulty is reduced greatly, guidance is provided for anti-seismic design of engineering building structures and the bridge structures, design of the engineering structure especially the bridge structure is optimized, and the design efficiency is improved.

The invention discloses a DInSAR near-fault co-seismic deformation field extraction method. The method includes the following steps that: step 1, synthetic aperture radar interferometry (InSAR) processing is performed on a synthetic aperture radar (SAR) image that needs co-seismic deformation field region extraction, so that a loss-of-relevance region caused by a strong earthquake can be obtained;step 2, the pixel offset values of the loss-of-relevance region is obtained through dense grid offset calculation and by means of a migration tracking algorithm; step 3, actual offset values are obtained according to the pixel offset values obtained in the step 2, and the actual offset values of all pixels in the loss-of-relevance region can be obtained, and the positions of slave image homonymypoint pairs are calculated, and a resampling process is completed; and step 4, synthetic aperture radar interferometry (InSAR) processing is performed on an image obtained in the step 3, so that a complete coseismic deformation field is obtained. With the method adopted, regional registration and sampling accuracy are significantly improved, the interference loss-of-relevance problem of a fault near field is partially solved, and richer and more accurate near field surface observation data are provided for the inversion of source model parameters.

The invention provides a design method of a buffering, energy dissipation and anti-beam-falling device used for a bridge. According to the displacement of a friction pendulum, the section form of the buffering, energy dissipation and anti-beam-falling device required to be used is derived reversely, the structural size of the device is further determined, according to the actual requirement, the buffering, energy dissipation and anti-beam-falling device can be mutually matched and coordinated with the friction pendulum, waste of material design or safety hazards are avoided, when a large earthquake occurs, a buffering and anti-beam-falling baffle plate or damping mortises and tenons can join yielding energy dissipation, the energy dissipation capacity of the system is effectively improved, when a small earthquake occurs, the device can play a role in protection and position limiting, the upper portion structure of the bridge is prevented from collision or beam falling or other serious damage, through the cooperation of the friction pendulum and other seismic mitigation and isolation supports, the shock insulation effect can be achieved, the safety of the whole structure is guaranteed, the device is particularly suitable for earthquake fortification in a near fault seismic oscillation region, the safety and maintainability of the bridge are enhanced, and the bridge maintenance cost after the earthquake is reduced.

The invention provides an examination and evaluation system for torsional vibration of a shaft system of a nuclear power steam turbine generator unit. The nuclear power steam turbine generator unit is connected with a boosting transformer, the boosting transformer is connected with one end of a transmission line, and the other end of the transmission line is connected with an infinite bus system. The examination and evaluation system comprises three fault points which include the exit fault point located between the generator unit and the boosting transformer, the near fault point located at the end, close to the boosting transformer, of the transmission line, and the transmission line fault point located on the transmission line. The fatigue life losses of the examination section of the shaft system of the nuclear power steam turbine generator unit are calculated under the electrical disturbance working conditions of the three fault points and phase angle error parallelism, the calculated result is compared with the set standard, and therefore torsional vibration of the shaft system of the nuclear power steam turbine generator unit is evaluated. The invention further provides an examination and evaluation method for torsional vibration of the shaft system of the nuclear power steam turbine generator unit. The system and method have universality and practicality, and can be more comprehensive and closer to the practical situation.

The invention discloses a method for establishing a pulse seismic oscillation response model taking a mountain terrain effect into consideration. A near-fault area tends to generate strong pulse seismic oscillation, and the mountain terrain can cause obvious amplification effect on pulse earthquake. According to the method, by comparing the acceleration spectrums of a trapezoid mountain model anda free field model under the action of pulse seismic oscillation, the obvious amplification effect of mountain terrains on pulse seismic oscillation is verified. Therefore, when the mountainous area is subjected to near-fault region earthquake risk evaluation, the amplification effect of mountain terrain on pulse seismic oscillation needs to be considered, so that pre-seismic disaster prevention and evaluation, earthquake-time emergency response and post-earthquake reconstruction planning can be realized in a manner of being closer to the actual situations.

The invention discloses a rural-power-grid distribution-equipment remote on-line fault diagnosis system based on a cloud server. The system comprises a temperature detection circuit and a voltage detection circuit which are connected to rural-power-grid distribution equipment. The temperature detection circuit and the voltage detection circuit are connected to a controller respectively. The controller is communicated with the cloud server. Detected temperature and voltage are uploaded to the cloud server to carry out storage and sharing. The controller is also connected to alarm equipment through a relay protection device. In the cloud server, according to real-time data, analysis and diagnosis are performed. In the invention, a workload of operation-maintenance personnel is decreased. Through installing various kinds of sensors, voltage detection circuits and temperature detection circuits on the rural-power-grid distribution equipment, low voltage distribution equipment running state data is collected and near fault diagnosis and rapid publishing are realized.

The invention provides a near fault pile group foundation disaster prevention and reduction structure which comprises a pile group foundation, double-row partition walls composed of cement mixing piles, soil layer anchor cables and a fine sand belt; the pile group foundation is arranged in an overlying soil layer of a fault footwall and is easily threatened by deformation and failure caused by movement of a fault; the double-row partition walls are arranged between the pile group foundation and a movement dipping fault, and adjacent cement mixing piles are tightly arranged and are inserted into the overlying soil layer to a certain depth; the soil layer anchor cables penetrate through the pile group foundation, one ends of the soil layer anchor cables are driven into a stabilized soil layer, and the other ends of the soil layer anchor cables are anchored on the cement mixing piles, close to one side of the pile group foundation, of the partition wall; and the fine sand belt is used forsubstituting soil bodies between the double-row partition walls. The structure can adopt effective disaster prevention and reduction measures aiming to the existing building which is arranged nearbythe movement dipping fault and adopts the pile group foundation.

The invention discloses an apparatus for simulating the fracture of a thrust fault. The apparatus comprises a loading device, a supporting device, a testing device, an auxiliary device and a fault model device; fault fracture induced pulse research is carried out with a physical model experiment; and the characteristics and spatial distribution rules of pulse seismic oscillation generated by different seismogenic fault types and different fault parameters are disclosed, so that a seismogenic fault type-based pulse seismic oscillation characteristic model is established. According to the priorart, due to the uncertainty of seismic oscillation and the constrain of observation technologies, the records of impulse type earthquakes obtained in actual earthquakes are not enough to accurately obtain the characteristics of near-fault impulse type seismic oscillation statistically. With the apparatus of the invention adopted, the above problem can be solved; pulses generated by different partsof the fault during the fracture of the thrust fault can be studied; and pulse characteristics and distribution rules during the fracture of the fault are recorded.