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68 results about "Rolling velocity" patented technology

The velocity of any point in the rolling object is given by , where is the displacement between the particle and the rolling object's contact point (or line) with the surface, and is the angular velocity vector. Thus, despite that rolling is different from rotation around a fixed axis, the instantaneous velocity...

Preparation method of solar ultrawhite ultrathin glass and product thereof

The invention relates to the field of production of ultrawhite rolled glass, in particular to a preparation method of solar ultrawhite ultrathin glass and a product thereof. The preparation method of the solar ultrawhite ultrathin glass comprises the following steps of: selecting and preparing raw materials; conveying the raw materials; melting; forming glass; annealing; detecting; and cutting and packaging. In the preparation method, iron content is controlled by taking different measures in the steps of selecting and conveying the raw materials, so that iron sulfide in the final solar glass is greatly reduced and the whiteness of the glass is improved; in the melting process, bubbles in the melted glass liquid is reduced by exhausting air and debubbling, controlling temperature and adding a glass clarifying agent, so that absorption rate is reduced and light transmittance is improved; and the annealing step of the glass finished product is a key link of the production process and plays an important role in the quality of the ultrathin glass product, so the defects that the ultrathin glass is easy to harden and easy to break during production and has high fragility are overcome by controlling rolling velocity, temperature and annealing rate in the process of glass forming and glass annealing.
Owner:ZHEJIANG JINGXING SOLAR ENERGY TECH

Control method and control system for traveling mechanism of milling planer

ActiveCN103147380AAvoid unnecessary consumption of powerReduce workloadRoads maintainenceControl devicesControl systemHydraulic pump
The invention provides a control method and a control system for a traveling mechanism of a milling planer. The traveling mechanism of the milling planer adopts hydraulic transmission, and oil lines of a plurality of hydraulic motors are connected in parallel to a hydraulic pump and used for respectively driving a corresponding track. The control method for the traveling mechanism of the milling planer comprises the steps of acquiring the working pressure of the hydraulic pump and the slippage rate of each track; judging the minimum value in the slippage rate of each track, and taking the minimum value as a target slippage rate; respectively calculating the working pressure change rate and the target slippage rate change rate according to the working pressure and the target slippage rate; calculating the traveling efficiency change rate according to the working pressure change rate and the target slippage rate change rate; and comparing the traveling efficiency change rate with a preset value, and adjusting the displacement of the hydraulic pump or the displacement of the hydraulic motors according to comparison results. The technical scheme of the invention changes the traveling efficiency of the traveling mechanism by adjusting the rolling speed of the tracks to ensure the traveling efficiency change rate to be stable within a preset range and avoid the unnecessary power consumption of the milling planer.
Owner:ZOOMLION HEAVY IND CO LTD

Early warning method and system for vehicle rollover

The invention discloses an early warning method and system for vehicle rollover. The early warning method comprises the steps that a roll velocity and a lateral acceleration of a vehicle body collected by a smart phone are obtained; the smart phone is fixed to a center console inside a vehicle; the roll velocity and an angle of roll are estimated by using a Kalman filter state observer, an estimation value of the roll velocity and an estimation value of the angle of roll are obtained; according to the angle of roll and an installation vertical deviation, the lateral acceleration is corrected to obtain a lateral acceleration correction value; according to the estimation value of the angle of roll, the estimation value of the roll velocity and the lateral acceleration correction value, the vertical load transfer rate of the vehicle is calculated; an alarm action of the corresponding level is triggered according to the level to which the vertical load transfer rate of the vehicle belongs; and alarm prompts of different levels correspond to the different levels of vertical load transfer rates, and the different levels of the vertical load transfer rates correspond to different value ranges of the vertical load transfer rates. According to the early warning method and system for the vehicle rollover, the robustness can be improved, meanwhile, the error of the vehicle rollover early warning is reduced, and the accuracy is improved.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY +1

Novel film applicator

The invention relates to a novel film coating machine, comprising a machine frame, a work-table, two guide rails, two hanging plates, a lead screw and an electric motor. The work-table is fixed on the machine frame; the guide rails are respectively arranged on both sides of the work-table, and the hanging plates are arranged at both ends of the work-table; the two hanging plates are connected with the two ends of by a bearing; a bearing housing is coated on the bearing, and the right end of the lead screw is connected with a belt wheel; the electric motor is fixed on the lower part of the right hanging plate, the belt wheel on the electric motor is connected with the belt wheel arranged at the right end of the lead screw, and the lead screw is coated in the nut; the film costing device comprises a riser, a slider, a fixing guide rail, an optical axis, a rubber shaft, frame strips, a connect plate, a nut, a linear bearing and an electric motor. The invention has the advantages of that the picture is fixed, the method that the rubber shaft moves horizontally and rolls for film coating in the inverse direction is adopted; the stability of film costing is enhanced and the film coating quality is improved; the gap between the rubber shaft, the movement speed of the rubber shaft and the rolling speed is adjustable; the film coating quality is ensured and the thickness of the film coat is controlled.
Owner:常明旺

Method of predicating flat-pavement mechanical properties of tyre based on test data of rotary drum test bed

ActiveCN104390794AReliable CorrectionThe mechanical properties of flat pavement are accurately obtainedVehicle tyre testingFinite element techniqueRoad surface
The invention discloses a method for predicating flat-pavement mechanical properties of a tyre based on test data of a rotary drum test bed. The method comprises the following steps of: setting load, tyre pressure, pavement rough state, rolling speed and movement working conditions (lateral deviation, lateral inclination, and the like) of the tested tyre, and implementing the tests and the simulations in the following steps under the conditions; establishing a model for the tested tyre by utilizing ABAQUS software, and respectively stimulating movement of the tyre on inner rotary drum pavement and outer rotary drum pavement; simultaneously correcting the tyre model by using the test data of the inner rotary drum test bed and the outer rotary drum test bed; simulating the tyre movement under the special condition on the flat pavement by using the corrected precise tyre model so as to precisely predicate the flat-pavement mechanical properties of the tyre. The method disclosed by the invention can be used for effectively eliminating influences of the pavement curvature by utilizing the tested data of the rotary drum test bed through a finite element technology to obtain the mechanical properties of the tyre on the flat pavement, has the advantages of simple needed test equipment and high predication precision. Meanwhile, the method is suitable for all tyres including large-load and high-rotation-speed aircraft tyres.
Owner:JILIN UNIV

Method for measuring wave speed of rock mass in front of tunnel face in tunnel

The invention discloses the technology to explore palm surface frontage geology and measure frontage rock rolling velocity using reflection in the tunnel and underground engineering. It sets up two intersecting measuring lines in the palm surface, and sets up a measuring point at each certain distance on the line, and each measuring point makes the small shock - distance measuring or the excitation and reception of the small transmitter-receiver distance, and then, by unitary method, the time curves of each measuring point converge to a time profile. With the time profile, when the reflection of each reflector surface corresponding reflecting the axis and each measuring point, it determines each reflector surface, and if the rock rolling velocity known, it calculates the position of each reflector surface according to the reflection time of the measuring points. In the rear sidewall of the palm surface, sets up the measuring lines, and many measuring points on it, to measure the reflection time of each point from the reflector surface. Assuming the rock rolling velocity, according to the measuring point reflection time measured in the palm surface, calculates the invented reflector surface space position, and calculates the reflection time of sidewall measuring points to invented reflector surface under the rolling velocity assumption, and compared with the practical measuring reflection, then to adjust the assumed rolling velocity value, and gradually approaching, to obtain the closest actual rolling velocity value.
Owner:钟世航

Method for improving line contact hydrodynamic lubrication under small slide-roll ratio

The invention provides a method for improving a line contact hydrodynamic lubrication under a small slide-roll ratio, comprising the following steps of: setting two solids in reverse contact to be a contact body I and a contact body II respectively, controlling the linear speeds of the surfaces of the contact body I and the contact body II which are actually paired, a slide-roll ratio value and a non-dimensional roll speed; coating an oleophylic coating on the surface of the contact body II; and fully filling lubricant oil in a gap between the contact body I and the contact body II, controlling a load (w) applied to the line contact area of the contact body I and the contact body II so that the generated maximum Hertz contact pressure is not greater than 0.5 GPa, thus forming the designed line contact hydrodynamic lubrication. The method can greatly decrease the friction coefficient of the contact area, thereby effectively decreasing the friction coefficients, the friction energy consumptions, and the friction temperature rises of the line contact hydrodynamic lubrications of roller bearings and the like under a small slide-roll ratio, and effectively improving the qualities and the bearing capacities of the hydrodynamic lubrications.
Owner:徐州筑之邦工程机械有限公司

Method of estimating an angle of attack and an angle of sideslip of an aircraft

A method for estimating an angle of attack and an angle of sideslip of an aircraft having a plurality of control surfaces each adjustable with respect to an associated reference surface. The method includes measuring quantities representative of the angle formed by each control surface with respect to the associated reference surface, and measuring an effective rolling speed, an effective pitching speed, and an effective yawing speed of the aircraft. A linearized model of a state observer is defined according to the following equations:{ x.=Ax+Bu+L⁢⁢δ⁢⁢yy=Cx+Du⁢wherein u is a vector containing the values of the quantities of each control surface, x is a vector including an estimated angle of attack, an estimated angle of sideslip, an estimated rolling speed, an estimated pitching speed and an estimated yawing speed, δy is an error vector including the errors between the measured speeds and the respective estimated speeds, y is a measure vector including the values of the measured speeds, A,B,C,D are matrices representative of the behavior of the aircraft in unperturbed motion and L is a feedback matrix including the gains of a predetermined numeric control filter. The estimated angle of attack and the estimated angle of sideslip are obtained from the model to use as an actual angle of attack and an actual angle of sideslip of the aircraft.
Owner:ALENIA AERONAUTICA SPA

Short-process producing and processing technology and equipment for cold rolling ultrahigh strength steel

The invention discloses a short-process producing and processing technology for cold rolling ultrahigh strength steel. The short-process producing and processing technology comprises the following steps: hot rolled strip steel, serving as an incoming material, is treated by procedures before rolling such as acid pickling and the like, cold rolling, heat treatment and deformation and phase transition comprehensive treatment, enters a loop after the heat treatment and the deformation and phase transition comprehensive treatment, is suitable for changes of the rolling velocity and the punch velocity by regulating the loop capacity and can enter a punching and quenching technology after being shorn with fixed length; and after the ultrahigh strength steel is finished, a finished or semi-finished punching part is obtained. Short-process producing and processing equipment for cold rolling the ultrahigh strength steel comprises a cold continuous rolling unit, a degreasing device inlet frame, a degreasing device, a looping tower, an annealing furnace front tension controlling device, an annealing furnace, an annealing furnace back tension controlling device, a collecting box and the like. With the adoption of the short-process producing and processing process and equipment, the energy consumption is reduced, the energy is saved, and the production cost is lowered; and by adding the deformation technology in the heat treatment process of the ultrahigh strength steel, the purpose of synchronous deformation and phase transition of the ultrahigh strength steel is realized, and the using performance of the strip steel is improved.
Owner:YANSHAN UNIV

Digital net making machine for plain net and digital net making method for plain net

InactiveCN101859063AAvoid prone to trachoma and other defectsQuality improvementScreening processesLiquid-crystal displayEtching
The invention discloses a digital net making machine for a plain net and a digital net making method for a plain net. The net making machine comprises a walking rack which moves along the Y direction and a UV optical etching head which is arranged on the walking rack and can moves along the X direction, wherein the UV optical etching head comprises a UV optical source and a liquid crystal display; the liquid crystal display is positioned between the UV optical source and a plain net, and is arranged in parallel to the plain net; and the UV optical source and the liquid crystal display are respectively connected with a computer. The digital net making method comprises the following step: carrying out computer color separation; carrying out computer strip-type partition on a monochrome picture performed with color separation and the effective display width of the liquid crystal display; when the velocity of the liquid crystal display moving along the X direction is equal and opposite to the rolling velocity of a scroll bar on the display, utilizing the UV optical source to irradiate the liquid crystal display to carry out UV optical etching; and flushing and developing. Since no photographic film is needed for carrying pictures, the invention has the advantages of greatly saved consumable items, saved manpower, lowered cost, high efficiency, stable quality and lower faulty product ratio.
Owner:郝鹏飞
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