摘要:
The invention discloses a novel proportional integral single-control-item sliding mode control method, and belongs to the technical field of integral sliding mode control. The method comprises the steps of establishing a hyperchaotic system model, establishing a controlled hyperchaotic system model with noise interference, establishing an error system, determining a sliding mode manifold, establishing a synchronization control system and the like. By utilizing the sensitivity of a chaotic trajectory to an initial value, the system can identify different modes with tiny differences, so that theapplication is generated in mode identification. The method has the beneficial effects that: aiming at the synchronization problem of a hyperchaotic system with noise interference, a novel proportional integral sliding mode manifold is adopted, and a control system only containing one control item is selected to ensure the rapid convergence and stability of sliding mode motion under the noise interference so as to realize the synchronization control; and in order to eliminate jitter, a steep continuous saturation function is used for replacing a discontinuous sign function, so that the systemis insensitive to external change, and relatively high robustness is generated; and the method can be applied to control systems such as aircrafts and inverted pendulums.
摘要:
The invention belongs to the technical field of street lamps, and discloses a double-lampholder synchronous magnetic drive type solar street lamp. The double-lampholder synchronous magnetic drive typesolar street lamp comprises shells, solar panels are arranged on both sides of the top surfaces of the shells, light-transmitting plates are arranged on both sides of the bottom surfaces of the shells, and lamp panels are arranged in the shells; upper brush rods are arranged on the solar panels; lower brush rods are arranged on the light-transmitting plates; magnetic conductive blocks are arranged at the bottoms of the upper brush rods and the lower brush rods; upper track surfaces are arranged between the solar panels; lower track surfaces are arranged between the light-transmitting plates;electric push rods are arranged in the shells, vertical rods are arranged at the front ends of the electric push rods, and magnets are arranged at both ends of the vertical rods to attract the corresponding magnetic conductive blocks; water collecting tanks are arranged on both sides of the shells; the lower ends of the water collecting tanks are open; both tail ends of the lower brush rods extendoutwards to form extending plates used for receiving rainwater at the bottom of the water collecting tanks. According to the street lamp, the shells are closed, automatic cleaning of the solar panelsand a lampshade can be synchronously achieved through magnetic air driving and a structure combining the solar panels and the lamp body, and the normal photoelectric conversion efficiency and illumination intensity of the street lamp are always maintained.
摘要:
The invention provides a self-adaptive FCM license plate positioning method and system, and the method comprises the steps: carrying out the rough positioning based on a vehicle image through employing license plate structure features, and obtaining a plurality of candidate regions; performing color clustering on the k-th candidate region based on an FCM algorithm to obtain C clustering center values; judging whether the number C of the clustering center values is less than a first set value or not; if the number C of the clustering center values is greater than or equal to a first set value,enabling k to be equal to k + 1, and the process returns to re-determine the category number C of the next candidate area; if the number C of the clustering center values is less than a first set value, merging the categories with the chromatic aberration smaller than a threshold value; sampling the two clustering center values with the highest local point proportion, and comparing the two clustering center values with a learning sample range value to obtain an error value; determining a license plate area based on the error value. The method not only improves the convergence speed, but also improves the accuracy and reliability of license plate positioning.
摘要:
The invention belongs to the technical field of catalyst preparation, and discloses an alkyl aromatic hydrocarbon dehydrogenation catalyst preparation method, which comprises: adding deionized water to a beaker containing K2O, CeO2 and WO3 to obtain a potassium salt-containing aqueous solution, a cerium salt-containing aqueous solution and a tungsten salt-containing aqueous solution; uniformly mixing the obtained aqueous solution, sequentially adding Fe2O3 powder, heavy rare earth oxide, a pore-enlarging agent and a binder, and fully and uniformly stirring by using a stirrer to prepare a sticky dough suitable for extrusion into strips; and extruding, activating, forming, drying and roasting the dough to obtain the alkyl aromatic hydrocarbon dehydrogenation catalyst. Through combination ofpotassium oxide, cerium oxide, tungsten oxide and iron oxide, the introduction of low-efficiency substances is reduced, and an active phase of the catalyst is stabilized and dispersed; an electron transfer channel between active sites is improved, the activity of the low-potassium catalyst under a low-temperature condition is obviously improved, and industrial production is facilitated.
摘要:
The invention discloses a music score writing demonstration board for music teaching and a use method thereof. The invention belongs to the technical field of teaching aids. The demonstration board comprises a demonstration board body and a writing board body. The demonstration board body comprises a shell with an opening and a transparent white board embedded at the opening of the shell; a lightreinforcing plate is arranged at the inner bottom of the shell; a plurality of partition plates are arranged in the shell; and a light adjusting mechanism is arranged between every two adjacent partition plates. The writing board body comprises an outer board body of a hollow structure. A support is arranged in the center of the interior of the outer plate body. Three groups of electromagnets aremounted on the support; and two extension writing boards are arranged on the left side and the right side of the electromagnet in the outer board body. Staff demonstration teaching can be convenientlyand rapidly carried out, the line spacing of staff can be conveniently adjusted, different use requirements are met, extended writing can be carried out, the use space is not occupied, and the application rate of the staff teaching aid is greatly improved.
摘要:
The invention discloses multifunctional equipment for art teaching. The multifunctional equipment comprises a fixed bottom plate; stabilizing columns are fixedly arranged on the two sides of the top end of the fixed bottom plate; a fixing column is fixedly arranged in the middle of the top end of the fixed bottom plate; brake universal wheels are fixedly arranged at four corners of the fixed bottom plate; a writing board is fixedly arranged between the stabilizing columns and the front side of the fixing column; mounting sleeves are fixedly arranged at the positions, corresponding to the fixing column and the stabilizing columns, of the rear side of the writing board; the mounting sleeves are connected with the stabilizing columns and the fixing column; a writing groove is formed in the middle of the front side of the writing board; a five-line board is fixedly arranged on the left side of the writing groove; a plurality of clamping mechanisms are fixedly arranged at the upper end of the front side of the writing board; each clamping mechanism comprises an elastic clamping rod and a clamping plate; and a plurality of clamping plates are fixedly arranged in the middle and on the twosides of the upper end of the front side of the writing board. In the using process, adjustment is convenient, and adjustment can be conveniently conducted according to the use requirements of peoplewith different heights.