83 results about "Force factor" patented technology

A method and device for detecting a force factor of a loudspeaker is provided. The method includes the steps of: providing the loudspeaker with a dynamic driving voltage signal; continuously measuring a current signal flowing through the loudspeaker; observing the current signal and if the current signal shows that the diaphragm excursion of the loudspeaker is greater than an displacement limit, decreasing the driving voltage signal until the current signal shows that the diaphragm excursion of the loudspeaker is less than or equal to the displacement limit; and substituting the current driving voltage signal, the current signal, the displacement limit, and an electrical impedance of the loudspeaker into a function so as to compute the force factor of the loudspeaker.

The invention discloses a composite insulator. The composite insulator comprises a core rod, a sheath and a connecting piece, wherein the sheath is coated on the outer side of the core rod; the connecting piece is connected with the core rod and the sheath; the sheath is made of high-temperature vulcanized silicon rubber; the connecting piece comprises a body and a bump which is arranged by surrounding the outer wall of the body; the body comprises at least one wedged groove which is circularly arranged on the outer wall of the body; and the sheath is coated on the outer walls of the bump andthe wedged groove. In the composite insulator, room-temperature vulcanized silicon rubber is not used as a sealant, and the high-temperature vulcanized silicon rubber is adopted. Since the high-temperature vulcanized silicon rubber is aging-resistant, the sealing effect of the composite insulator is difficult to damage by erosion of an external environment when the composite insulator is exposed outdoors and even in certain severe environments. Meanwhile, the sheath cannot be stripped off from encapsulated rubber on a hardware tool and the core rod by an external force factor produced during transportation, mounting and maintenance by using the buckling effect of the bump and the wedged groove on the sheath, so that the sealing failure cannot be caused.

The method is applicable to conventional sound-frequency measuring meter. Feeding-in an adjustable DC current shifts the voice coil a certain displacement from equilibrium position. Under different displacements of the coil, using conventional sound-frequency measuring meter measures characteristic of electrical impedance of speaker unit. Based on model of nonlinear electrical impedance, using technique of system identification obtains nonlinear parameters of speaker unit. The said measurement of nonlinear parameter is related to measuring non-linear force factor, non-linear equivalent force and non-linear inductance of voice coil. Using conventional sound-frequency measuring meter, the invention can measure curve of electrical impedance of speaker unit, and caries out system identification for measured impedance curve of speaker unit.

The invention discloses a universal milling force modeling method for a uniform plough model, which solves the technical problem in the prior art that existing universal milling force modeling methods are poor in versatility. According to the technical scheme of the invention, the ploughing force is uniformly expressed as the product of the ploughing force factor multiplied by the volume of the extruded material. Meanwhile, the ploughing force is separated, so that the influence of the ploughing effect on the shearing factor is avoided. Firstly, several sets of static milling experiments are conducted, and the data of the milling force are recorded. Secondly, the milling force measured in a cartesian coordinate system is converted into the milling force in a milling cutter local coordinate system, and the value of the ploughing force in the local coordinate system is determined through the linear regression method. Thirdly, the factor of the milling force is calculated through separating the shearing force from the milling force, and then is compared with an experimentally measured value. Through the repeated iteration process, the data of the shear angle and the data of a normal friction angle are obtained, and then the factor of the shearing force is determined. Therefore, the factor of the ploughing force is determined based on the separated ploughing force and the determined volume of the static extruded material. By adopting the uniform plough model, whether the cutting process is stable or not no longer needs to be judged. Therefore, the method is good in versatility.

The invention provides an improved K-RUSLE model and a method for calculating soil erosion by using a soil formation rate. The method comprises the steps that 1, data is obtained; 2, rainfall erosional force is calculated; 3, an erosion modulus is calculated; 4, lithological characters are cut; 5, the karst soil formation rate is calculated; 6, the soil erosion modulus is checked out; 7, the soil erosion modulus is corrected. According to the method, the karst soil erosion amount and the non-karst soil erosion amount are processed respectively, a rainfall erosional force factor is subjected to karstification, and the rainfall with no erosion generated can be effectively removed, so that results of the rainfall erosional force are more precise; based on a threshold value of the soil formation rate, the theoretical soil erosion modulus is subjected to validity test, meanwhile, error correction is conducted, and the accuracy rate of the soil erosion results can be remarkably improved.

A method of controlling a loudspeaker output comprises deriving (10) an admittance function (y[k],16) over time from the voice coil voltage (v[k]) and current (i[k]). In combination with a delta function (´[k]), the force factor (¦) of the loudspeaker and the blocked electrical impedance (R e ), the input-voltage-to-excursion transfer function (h vx [k]) over time is obtained. This is used to control audio processing for the loudspeaker thereby to implement loudspeaker protection and/or acoustic signal processing. The invention provides a modelling and control approach which is not based on a parametric model. As a consequence, it does not require prior knowledge regarding the enclosure (e.g. closed or vented box) and can cope with complex designs of the enclosure.

The invention discloses a surface heat sink of a micro-nano composite structure and a heat transfer enhancement method of the surface heat sink, is used in the field of large power electronic integrated device heat exchanging, and solves the cooling problem of high heat flow density. The surface heat sink of the micro-nano composite structure comprises a micro groove group heat sink and a nanometer coating; the nanometer coating is generated on the surface of the micro groove group heat sink; a surface material of the micro groove group heat sink is a semiconductor, glass, ceramic or metal andan alloy of the metal; the micro groove cross section of the micro groove group heat sink is rectangular, trapezoidal or triangular; and a material of the nanometer coating is metal, a metal oxide, metal fluoride, a semiconductor material or organic high polymer paint. According to the surface heat sink of the micro-nano composite structure, the heat exchanging performance of the surface of the micro groove group heat sink is reinforced, and meanwhile, by means of the surface expanding and capillary acting force factors of the micro groove group structure, the phase changing heat exchanging capacity of the heat sink is improved.

The invention relates to a method and a device for measuring the crushing degree of tobacco shreds. By the established crushing degree measuring method, not only the capability and the level of a material incoming end working procedure can be represented, but also the mass variation of the crushed tobacco shreds can be reflected through a crushing process, so that the physical quality of final cigarette products can be predicted. By utilizing the method and the device, the crushing of the tobacco shreds in any process can be studied, the self anti-crushing property of raw materials can be reflected, and the influence of external force factors, such as process flows, conditions and the like on the anti-crushing property thereof can be studied. The invention has the following advantages: by directly measuring the crushing degree of the tobacco shreds, the anti-crushing ability of the tobacco shreds is represented correctly and the size distribution conditions of the tobacco shreds before being crushed and after being crushed are reflected; the invention is of great significance in predicting the processing quality of the tobacco shreds and provides an effective measure for studying the crushing process of tobacco shreds; meanwhile, the invention has advantages of low sampling quantity, simple operation and good method reproducibility. The designed special crushing device has reasonable structure and can simulate the crushing degree of any processing on the tobacco shreds.

The invention provides a method and a system for evaluating mountain torrent disaster risks of villages along river based on a DPSIR model. The evaluation method comprises the following steps: selecting indexes corresponding to a driving force factor, a pressure factor, a state factor, an influence factor and a response factor, and constructing an index system based on a DPSIR model to form an index library; screening out a preset number of indexes related to each factor from an index library, and obtaining corresponding index values and performing normalization processing; calculating the weight of the selected index; multiplying the corresponding normalized index value of the screened pressure factor, the corresponding normalized index value of the state factor, the corresponding normalized index value of the influence factor and the corresponding normalized index value of the response factor by corresponding weights respectively, and then accumulating the same kind to obtain a pressure degree P, a pressure bearing degree S, a vulnerability degree I and a loss stopping degree R; and introducing a reduction pressure bearing degree and a reduction vulnerability degree, calculatingto obtain a comprehensive evaluation risk degree, comparing the comprehensive evaluation risk degree with a preset risk level threshold value, and judging the mountain flood disaster risk level to which the village along the river belongs at present.

The invention discloses a glue cylinder anti-loosening locking device of a cigarette carton packaging machine and the cigarette carton packaging machine. When a compression device (55) is rotated in position, a compression block is meshed with a compression block which is arranged on a glue cylinder, a spring (62) pushes the lower end of a locating pin (61) into a key groove, and the lower end of the locating pin (61) is matched with the key groove so as to lock the compression device (55); and when the compression device (55) is unlocked, a handle (66) is pulled so as to drive the lower end of the locating pin (61) to exit the key groove, so that the compression device (55) can rotate. The device and the cigarette carton packaging machine can be automatically locked after the glue cylinder is compressed, the compression device cannot rotate when a self-locking device is controlled by a locating function, so that the longitudinal displacement of the glue cylinder is prevented from changing due to the external force factor, and a poor gluing phenomenon of a carton label paper cannot be caused; and the quality defect of poor glued carton label paper is thoroughly solved, and the production cost is lowered.

The invention discloses a 21%-thickness main airfoil for a megawatt wind turbine blade. A wing form with the relative thickness of 0.21 chord length, the chordwise position, corresponding to the maximum thickness, of 0.325 chord length, the trailing edge thickness of 0.05 chord length, the design lift coefficient of 1.2 and the designed attack angle of 6 degrees is designed through a computational fluid mechanics method and an advanced airfoil parameterization method. The airfoil has a high lifting coefficient, and can shorten the chord length of the blade and reduce the weight of the blade. Under the design conditions of a high Reynolds number and high lift force, the airfoil has a higher lift-drag ratio compared with the other airfoils in the same class, and the utilization factor of wind energy is improved. Under the non-design condition that the Reynolds number is lower than 1.5*106, the airfoil has the lift-drag ratio equivalent to that of a traditional airfoil. The maximum lifting force factor of the airfoil is not sensitive to roughness. The airfoil is particularly suitable for megawatt speed change or a bending-moment adjustment large wind turbine.

The invention relates to a traffic signal lamp, in particular to an emergency traffic signal lamp. The technical problem to be solved by the present invention is to provide an emergency traffic signal light whose angle and height can be freely adjusted. In order to solve the above technical problems, the present invention provides such an emergency traffic signal light, which includes a mounting frame, etc.; the bottom of the mounting frame is symmetrically connected with wheels, the upper left side of the mounting frame is provided with a push rod, and the bottom of the mounting frame is provided with a second A mounting plate, the top of the first mounting plate is connected with a second mounting plate through a rotating device, the second mounting plate is provided with a lifting device, the top of the lifting device is provided with a third mounting plate, and the front side of the third mounting plate is provided with a traffic light body. The invention is convenient to flexibly adjust the height of the traffic light body, satisfies the normal use of the equipment under different traffic conditions, improves the practicability of the equipment, prevents the equipment from sliding at will under external force factors, affects the normal operation of the equipment, and improves the safety of the equipment. stability.

The invention discloses a focusing device for a stage lamp. The focusing device comprises a heat-dissipating aluminum plate and a lifting power device arranged on the heat-dissipating aluminum plate, wherein the lifting power device comprises a motor fixing plate, a linear stepping motor, two focusing guide rods, a focusing supporting plate, a flange and a limiting block; the motor fixing plate is fixedly arranged on the heat-dissipating aluminum plate; the linear stepping motor is fixedly arranged on the motor fixing plate; the bottom ends of the two focusing guide rods are respectively and fixedly arranged at the two sides of the motor fixing plate; the top ends of the two focusing guide rods are respectively and fixedly arranged at the two sides of the limiting block; the two focusing guide rods are respectively provided with a bearing in a sheathing manner, and both the two bearings are fixedly arranged on the focusing supporting plate; the focusing supporting plate is fixedly arranged on a lens rotating disc component supporting plate; and the flange is fixedly arranged on the focusing supporting plate, is provided with internal threads and is sheathed on a screw rod. The focusing device disclosed by the invention has the advantages that the screw rod in the linear stepping motor rotates and pushes the flange to move up and down under the guiding of the focusing guide rod so as to drive the focusing supporting plate and the lens rotating disc component supporting plate to move up and down; and the two focusing guide rods are connected with the limiting bock and the motor fixing plate to form a whole body, so that the whole rigidity is strong and the influence from external-force factors is not easily generated.

The invention discloses a 25%-thickness main airfoil for a megawatt wind turbine blade. A wing form with the relative thickness of 0.25 chord length, the chordwise position, corresponding to the maximum thickness, of 0.325 chord length, the trailing edge thickness of 0.09 chord length, the design lift coefficient of 1.2 and the designed attack angle of 6 degrees is designed through a computational fluid mechanics method and an advanced airfoil parameterization method. The airfoil has a high lifting force factor, the chord length of the blade can be reduced, and therefore the weight of the blade is reduced. Under the design conditions of a high Reynolds number and high lift force, the airfoil has a higher lift-drag ratio compared with the other airfoils in the same class, and the utilization factor of wind energy is improved. Under the non-design condition that the Reynolds number is lower than 1.5*106, the airfoil has the lift-drag ratio equivalent to that of a traditional airfoil. The maximum lifting force factor of the airfoil is not sensitive to roughness. The airfoil is particularly suitable for megawatt speed change or a bending-moment adjustment large wind turbine.

The invention provides a basin erosion sediment production predicting method coupling with different spatial and temporal scale models. The method comprises the following steps: dividing a to-be-detected drainage basin into m sub drainage basins according to DEM topographic data and a remote-sensing image of the to-be-detected drainage basin; carrying out statistics on rainfall times n of each subdrainage basins every year, calculating the erosion sediment production and spatial distribution thereof of each sub drainage basin after rainfall every time and updating the DEM data of each sub drainage basin to obtain updated DEM data; and then calculating the gradient and slope length factor LSl of the lth sub drainage basin W1, and calculating the annular erosion sediment production f (Wl) according to a rainfall erosive force factor Rl, a soil erosive factor Kl, a slope length factor LSl, a vegetation factor Cl, an engineering measure factor El, a tillage measure factor Tl and a liner erosion coefficient factor Gl of Wl so as to further predict the annular erosion sediment production of the to-be-detected drainage basin W. The method overcomes the defect that the topographic parameters of a single experience model are immobilized and considers maldistribution of the rainfall space and the erosion sediment production mechanism fully, so that the soil erosion process can be betterreflected.

The invention discloses a self-positioning alignment device for wireless charging. The self-positioning alignment device comprises a wireless charging emitter and a wireless charging receiver. The upper surface of the wireless charging emitter is equipped with a first wireless charging positioning device; the center of the first wireless charging positioning device is provided with a run-through circular through hole; the lower surface of the wireless charging receiver is equipped with a second wireless charging positioning device; the second wireless charging positioning device is a raised cylinder structure; and the first wireless charging positioning device and the second wireless charging positioning device are matched and buckled into one body. Through mutual cooperation between the circular through hole and the cylindrical bulge of the first wireless charging positioning device and the second wireless charging positioning device, alignment of wireless charging is realized, thereby avoiding the problem of over-low charging efficiency due to coil deviation caused by external force factors in the charging process.

The invention relates to an image denoising algorithm based on a Demons algorithm. The method comprises the following steps: firstly, on the basis of the Demons algorithm, regarding a diffusion process as image registration, and establishing a new Demons denoising algorithm based on image registration, wherein the PM algorithm, with relatively classical denoising performance, of the algorithm is preferable; secondly, in view of that local feature depending on gradient information representation images is insufficient in an image denoising process and second-order differential quantities contain richer information, taking a level set curvature as a driving force factor for controlling an image structure to be introduced in an image registration denoising algorithm, and establishing an image denoising algorithm of gradient and curvature dual driving force, namely a dual driving algorithm; finally, adopting an additive operator splitting algorithm (AOS algorithm) to process the algorithm to obtain an image after denoising. The denoising performance is superior, and the integral structure of the image is kept intact, the image SNR (Signal to Noise Ratio) after denoising is improved by about 15 dB compared with other Demons algorithms and is improved by about 25 dB compared with the PM algorithm, and the definition is also greatly promoted.

The invention discloses a smart home anti-pinch door using a superconducting magnet diamagnetism principle. The smart home anti-pinch door comprises a door frame, a movable door, an anti-pinch deviceand a hinge; a controller is electrified to control closing of an electromagnetic valve by using a hydraulic device; oil is sealed on the left side of the hydraulic cylinder; a piston and a corrugatedextension pipe are stopped by using continuous boosting flexible resistance of the oil, so that the door closing speed and the impact force are reduced, the noise caused by heavy closing due to influence on the door by the inertia is prevented, and the door, a lock and other objects are protected from damaging; the controller is electrified to enable a coil to generate magnetic field connection by using the anti-pinch device to generate relative movement between a superconducting magnet and an aluminum ring, and the aluminum ring generates induction current to achieve a magnetic repulsion effect; and the closing of the movable door is stopped by using magnetic repulsion force to prevent pinching injury or collision injury of children caused by quick closing of the door due to such external force factors as gale when playing beside the door, so that potential safety hazards are effectively prevented, and the personal safety of the children is guaranteed.

The invention discloses a locking and fixing manner suitable for a combined container. Starting from convenience in the container combining process, container combining and screwing fixing are achieved; and the stability generated after container locking and fixing is enhanced emphatically, and an effective and feasible technical scheme is provided for container combining and fixing. According to a screwing manner suitable for the combined container, through a sealing cover, the relative state between container parts is achieved through cooperation of the first container part and the second container part in the threaded structure; on the basis that a buckling cover is stressed and pressed to be fixed to the second container part, locking between the container parts is achieved by further adopting a concave-convex groove and other limiting structures, and relative positions are fixed; container loosening caused by external force factors in the transport process is avoided; and mounting stability is improved.