33 results about "Near fault" patented technology

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 invention discloses a combined shock absorption system of a high-speed railway bridge and a design method of the combined shock absorption system. The combined shock absorption system is used for reducing and controlling damage to and destruction of the high-speed railway bridge in a strong earthquake. Firstly, a design scheme of a combined shock absorption and limiting system with earthquake-proof bars and cable limiters used is provided on the basis of a function separate support design concept, earthquake response of the bridge is reduced through yield energy consumption of the earthquake-proof bars, and the cable limiters are used for controlling oversize deformation of the earthquake-proof bars and preventing damage caused by bridge fall; secondly, in the framework of performance-based seismic design, design methods of the earthquake-proof bars and the cable limiters are provided under the conditions of frequent earthquakes, design earthquakes and rare occurrence earthquakes respectively; accordingly, the earthquake response of the high-speed railway bridge is reduced, the earthquake-proof property of the structure is improved, and the combined shock absorption system of the high-speed railway bridge and the design method of the combined shock absorption system are particularly suitable for bridge structures suffering from near-fault pulse-like ground motions.

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 a seismic assessment method of a bridge under the near fault ground motion. Whether the selected bridge type meets the requirements can be rapidly assessed, design time of primary type selection can be saved, seismic analysis and assessment of the bridge can be rapidly performed, the complex process of generating artificial seismic waves carrying the near fault characteristics by using finite elements to perform time procedure analysis can be effectively avoided without artificial generation of seismic waves, and the conformed index value of the bridge site is directly substituted to a probabilistic seismic demand model to perform simplified calculation. Besides, multiple positively correlated ground motion parameters are adopted for solution and then the comparisonresult proves that the result is reliable and effective, the accuracy is higher, the seismic performance of the bridge can be enhanced, the characteristic of constant length periodic structure of thebridge can be further met, and the method is further suitable for bridge seismic design under the near fault pulse-like ground motion, widely suitable for seismic analysis and assessment of all the components of the near fault bridge structure and rapid verification of other design methods and favorable for enhancing the accuracy of bridge seismic design analysis.

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 discloses a multi-level limiting system capable of realizing bridge structures under the action of near-fault pulse earthquakes. The system consists of an upper plate, a chute, a spring, a slider, a connecting rod, a middle cylinder and a lower plate. The initial slack is provided by the free length between the slider and the spring, and multi-level buffering is realized through eight chute systems in different orientations, so that the displacement of the bridge structure can be met by near-fault pulse earthquakes, and the structure is reduced by multi-level buffering internal force. And thanks to the springs, the system is self-resetting after an earthquake. This multi-level buffer limit system can be installed in long-span bridges, and is also suitable for medium- and small-span bridges (including oblique curved bridges); this system not only has good adaptability to near-fault pulse earthquakes, but also to far-field earthquakes efficient. The system does not affect the normal operation of the bridge structure, and only plays a role under strong earthquakes.

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 near-fault aseismic design spectrum correcting method based on the China seismic code, and relates to the field of building structure aseismic design. In order to solve the problem that an aseismic design spectrum in the China current 'code for seismic design of building' (GB50011-2010) does not consider the near-fault effect insufficiently, correction considering the near-fault effect on the basis of the code for the aseismic design spectrum is put forward. Code aseismic design spectrum control parameters corresponding to frequent earthquakes are corrected; the obtained code design spectrum amplitude is multiplied by the spectrum amplitude amplification coefficient, the obtained characteristic period Tg of the code design spectrum is adjusted to a characteristicperiod Tg limit; adjusting coefficients for the 50% assurance rate and the 84% assurance rate are put forward, and adjustment is performed on the basis of the seismic code design spectrum. The application range is the aseismic design of the near-fault region building structure.

The invention provides a design method for a combined shock isolation device under the near-fault seismic effect. The combined shock isolation device is formed by a friction pendulum support and a buffer collapse-proof device so that the friction pendulum support and the buffer collapse-proof device dissipate energy in a unified and coordinated mode, during anti-seismic design, technical parameters of the devices in the combined shock isolation device are combined and designed according to the actual bridge requirement, fine design and control are easy, it is ensured that the upper structure has the high deformation capability and it is also ensured that beam collapse is avoided; the phenomenon that material waste or insufficient anti-seismic property is caused due to design performed according to the theoretical condition, reinforcing steel bar consumption is reduced, the energy consumption effect of the combined shock isolation device is improved, and inertia force of the upper structure is effectively reduced, so that lower structures such as a pier and a foundation are protected, distribution of earthquake force under the lower structures is adjusted, the bridge anti-seismic property is improved, it is ensured that no beam collapse is caused under the major earthquake condition, meanwhile, the support is protected against serious damage, the safety is enhanced, and the post-earthquake bridge maintenance cost is lowered.

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 relates to a two-stage buffering and limiting seismic isolation device. The device comprises a seismic isolation support, an upper support plate fixed at the upper end of the seismic isolation support, a lower support plate fixed at the lower end of the seismic isolation support and two-stage buffering mechanisms arranged outside the seismic isolation support; each two-stage buffering mechanism comprises two first limiting stop blocks, a U-shaped steel plate, a second limiting stop block, two third limiting stop blocks and a steel bar, a lower steel plate is fixed on the upper end surface of the lower support plate, the two first limiting stop blocks are fixed on the lower end surface of the upper support plate, the second limiting stop block is fixed on the upper end surfaceof an upper steel plate and located between the two first limiting stop blocks, the two third limiting stop blocks are fixed on the lower end surface of the upper steel plate, and the steel bar is fixed on the upper end surface of the lower steel plate and located between the two third limiting stop blocks. The seismic isolation device solves the technical problem of failure of the seismic isolation support due to too large horizontal displacement under the action of near-fault ground motion, and belongs to the technical field of seismic isolation of buildings.

The invention relates to a hidden fault early warning method and device based on protection starting and associated recording analysis, and the method comprises the steps: obtaining fault recording data; extracting characteristic parameters representing the state of a fault point from the fault recording data; and obtaining a hidden fault early warning result according to the characteristic parameters. According to the embodiment of the invention, early warning results such as near fault point protection starting early warning, sampling abnormity early warning and main transformer near area fault early warning are obtained through fault recording data; and moreover, the application range and the application depth of the fault recording data are expanded, and hidden faults of the protectiondevice can be found in advance, thereby meeting the operation requirements of the intelligent power grid.

The invention discloses a shock-absorbent power-wasting three-way limiting metal damping device for a near-fault bridge and a mounting method thereof. The device comprises an elastic-plastic limitingshock-absorbent power-wasting rod and an adjustable connecting plate, wherein the adjustable connecting plate is provided with an inner hole; each cross section of the elastic-plastic limiting shock-absorbent power-wasting rod can simultaneously enter a yield state to realize maximum ductile deformation; the bottom of the elastic-plastic limiting shock-absorbent power-wasting rod is connected withthe top of a bridge pier, a bridge tower crossbeam or an arch rib crossbeam; the top of the elastic-plastic limiting shock-absorbent power-wasting rod extends into the inner hole, the periphery of the top is abutted against the wall of the inner hole along two opposite sides of a bridge direction, and the separation distance n (n is more than or equal to 0) is reserved between two opposite sidesof a top transverse bridge direction and the wall of the inner hole; the adjustable connecting plate is connected with an upper connecting piece; a lifting lug is arranged at the top of the elastic-plastic limiting shock-absorbent power-wasting rod; the bottom of the upper connecting piece corresponding to the inner hole is provided with an anti-pulling pull ring; a gap is arranged between the topend of the lifting lug and the bottom end of the anti-pulling pull ring; and the anti-pulling pull ring and the lifting lug are connected through an anti-pulling pull cable.

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.

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 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 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 invention provides a seismic assessment method of a bridge under the near fault ground motion. Whether the selected bridge type meets the requirements can be rapidly assessed, design time of primary type selection can be saved, seismic analysis and assessment of the bridge can be rapidly performed, the complex process of generating artificial seismic waves carrying the near fault characteristics by using finite elements to perform time procedure analysis can be effectively avoided without artificial generation of seismic waves, and the conformed index value of the bridge site is directly substituted to a probabilistic seismic demand model to perform simplified calculation. Besides, multiple positively correlated ground motion parameters are adopted for solution and then the comparisonresult proves that the result is reliable and effective, the accuracy is higher, the seismic performance of the bridge can be enhanced, the characteristic of constant length periodic structure of thebridge can be further met, and the method is further suitable for bridge seismic design under the near fault pulse-like ground motion, widely suitable for seismic analysis and assessment of all the components of the near fault bridge structure and rapid verification of other design methods and favorable for enhancing the accuracy of bridge seismic design analysis.