148results about How to "Reduce correction" patented technology

This invention relates to a kind of attitude definition method of micro inertia mixed navigation system of microminiature aero craft, belongs to microminiature vehicle attitude definition method. The method utilize guidance information, control Kalman filter noise matrices, to realize self-adapting adjust according to flight status; through parameter adjust to realize attitude definition of micro inertia mixed navigation system on dynamic airborne conditions; the specific process: through GNC closed loop circuit guidance algorithm, to gain aero craft barrel angle; through sensor picking, obtain vehicle rate and specific force; by strap inertial navigation algorithm to resolve out vehicle attitude, velocity and position information; by accelerometer and GPS data to count pose and position measurement information of aero craft; real-time compute horizontal attitude variance of Kalman filter observation noise matrices, through Kalman filter to estimate error of strap inertial guidance system; Amend above acquired pose, velocity and position information, and took as feedback information to import in control system.

The invention discloses an attenuation rectifying method and system. The attenuation rectifying method includes: collecting standard polyethylene terephthalate (PET) data and a standard computed tomography (CT) image under the standard time phase and nonstandard PET data under various nonstandard time phases; performing image reconstruction on the standard PET data under the standard time phase and the nonstandard PET data under the nonstandard time phases to obtain a standard PET image and nonstandard PET images under the various nonstandard time phases; respectively obtaining the motion information of the nonstandard PET images corresponding to the standard PET image under the various nonstandard time phases; performing motion compensation on the standard CT images according to the various motion information to obtain the nonstandard CT images under the various nonstandard time phases; performing attenuation rectifying on the standard PET data through the standard CT image, and performing attenuation rectifying on the nonstandard PET data under the same time phase through the nonstandard CT images under the various nonstandard time phases so as to obtain the CT images of different phase intervals without repeated CT scanning.

The invention discloses a welding method for a furnace top flange of a blast furnace. The method mainly comprises the following steps that checking and accepting; measuring and paying off; groove preparation; hoisting in position; leveling and centering; scale division and marking out, wherein even scale division and marking out are carried out on the furnace top flange through two or more diameter lines, pitch circles of rib plates arranged on the furnace top flange are equally divided into a plurality of small circular arcs, pitch circles, crossing with a furnace top steel ring, of the furnace top flange are equally divided into a plurality of small circular arcs, and pitch circle face, crossing with the furnace top steel ring, of the furnace top flange are equally divided into a plurality of congruent small sectors; rib plate welding, wherein the two sides of the rib plates are fixedly connected from the inner ends to the other ends through a symmetric welding method, and the welding speed is the same; flange welding, wherein backing weld and layered continuous bead welding are included; according to backing weld, the symmetric welding method is adopted, in the manual electric-arc welding manner, same-direction symmetric welding begins to be carried out on two sides of grooves in the centered and segmented symmetric segments at the same time, and according to the layered continuous bead welding, the number of welding layers is determined according to the thickness of the furnace top steel ring and the thickness of the furnace top flange, and the symmetric welding method is adopted, and same-direction continuous bead welding begins to be carried out on the two sides of the grooves in the centered and segmented symmetric segments at the same time.

The invention discloses a determination method for pressure altitude parameters on a subsonic vehicle body. The determination method comprises a selection principle of a pressure source on the subsonic vehicle body and a data processing method for measuring pressure based on a selected pressure source, wherein the selection principle of the pressure source on the subsonic vehicle body is used for selecting and locating the pressure source; the data processing method for measuring pressure based on the selected pressure source comprises a correction formula fitting and measured value returning and calculating method, wherein the correction formula comprises [alpha] correction, [beta] correction and static pressure correction, and the returning and calculating method is a method that objective variables are obtained according to the iteration of pressure measuring values. Test results show that the corrected data has very high reducibility, the objective variables including a flying attitude angle, a speed and the like of a subsonic vehicle with higher precision can be obtained by combining the returning and calculating method, therefore, a new method is provided for the subsonic flying speed measurement of the subsonic vehicle.

A controller performs compression self-ignition combustion control for combusting a mixture gas by injecting fuel into a cylinder in a negative valve overlapping period (NVO period), in which both of an exhaust valve and an intake valve are closed, and by causing self-ignition of the mixture gas using compression in a compression stroke. If knocking is detected during the above control, the controller performs knock suppression control for correcting a fuel injection quantity in the NVO period to suppress the knocking. If a pressure increase rate of cylinder pressure during the combustion is lower than a threshold value, the controller performs increase correction of the fuel injection quantity in the NVO period. If the pressure increase rate is equal to or higher than the threshold value, the controller performs decrease correction of the fuel injection quantity in the NVO period.

A dielectric antenna having an at least partially dielectric body and an electrically conductive sheath, wherein the dielectric body can be struck on a supply section with electromagnetic radiation and the electromagnetic radiation can be at least partially emitted from the dielectric body via a lens-shaped radiation section. The conductive sheath essentially surrounds the dielectric body from the supply section to the radiation section and a supply opening is provided in the conductive sheath in the area of the supply section and a radiation opening is provided in the conductive sheath in the area of the radiation section. The dielectric antenna that is easy to produce, has little interference and has a short construction as a result of the dielectric antenna having essentially the cross section of the radiation opening in the area of the supply section.

The invention discloses a production method of precoated photosensitive etching printed board, which precoats a durable photo-induced etching-resist material of stable photochemical property on the surface of a two-layer or multilayer metal plate synthesized by electric plating, vacuum deposition and the like, to prepare a precoated photosensitive etching printed board. In board making, the precoated photosensitive etching printed board can be burnt, developed, etched and removed with film to product a metal printed board. The produced precoated board can be stored without light for at least one year to satisfy the printing demands of anti-false products with large printed mass such as bank notes and valuable securities and the like. The board making can adopt large power UV light source direct board making device (CTcP), to improve the quality of printed boards and the consistence of repeated production. The precoated photosensitive board can reduce the production period of printed boards and improve production efficiency.

The invention relates to an adjusting method for using ionospheric echo to do high frequency wire array channel, which is characterized in that it detects the ion layer reflecting signal in high frequency radar ionospheric echo and uses the statistical analysis on array each channel ionospheric echo to do the channel amplitude and phase adjusting. It is a truly non-channel adjusting method without any limit to the wire array type.

In the dimension measurement of a circuit pattern using a scanning electron microscope (SEM), in order to make it possible to automatically image desired evaluation points (EPs) on a sample, and automatically measure the circuit pattern formed at the evaluation points, according to the present invention, in the dimension measurement of a circuit pattern using a scanning electron microscope (SEM), it is arranged that coordinate data of the EP and design data of the circuit pattern including the EP are used as an input, creation of a dimension measurement cursor for measuring the pattern existing in the EP and selection or setting of the dimension measurement method are automatically performed based on the EP coordinate data and the design data to automatically create a recipe, and automatic imaging / measurement is performed using the recipe.

A teaching line correcting apparatus defines a first plane, which is determined by a first reference position of a preset first reference region, a second reference position of a preset second reference region, and a third reference position of a preset third reference region, defines a second plane, which is determined by a detected position of the first reference region, a detected position of the second reference region, and a detected position of the third reference region, calculates a corrective value for equalizing the first reference region to an origin, equalizing the first reference position of the first reference region as the origin to the detected position of the first reference region as the origin, and equalizing the first plane to the second plane, and correcting reference coordinates where operating points are taught based on the calculated corrective value.

The invention relates to a grinding head assembly of a glass edge grinding machine and an edge grinding process thereof. The edge grinding process comprises the steps that machined glass enters the glass edge grinding machine in the feeding direction and passes through a chamfering grinding wheel component firstly, and the upper edge and the lower edge of the machined glass are ground by the chamfering grinding wheel component to form chamfer edges; then the machined glass passes through forming grinding wheel components, and the edges of the machined glass are machined into arc edges. The grinding head assembly of the glass edge grinding machine is provided with the chamfering grinding wheel component and the forming grinding wheel components; meanwhile, the chamfering grinding wheel component and the forming grinding wheel components can work simultaneously; when forming grinding wheels of the forming grinding wheel components are arc forming grinding wheels, the machined glass can be chamfered firstly and then the edges of the machined glass are ground into the arc edges, so that the grinding amount of the machined glass by the arc forming grinding wheels is greatly reduced, the service life of the arc forming grinding wheels is prolonged, the amendment and replacement frequency of the forming grinding wheels is reduced, and the number of the forming grinding wheels is decreased.

The invention relates to an automatic welding method of an electrically heated element bushing of a voltage stabilizer and a reducing bushing of the electrically heated element bushing, which is characterized by comprising the following steps: firstly, carrying out non-wire feeding melting welding on a beveling root between the electrically heated element bushing of the voltage stabilizer and thereducing bushing of the electrically heated element bushing by adopting automatic impulse argon-arc welding, wherein, a welding gun takes an axes of the reducing bushing as a center line to rotates 360 DEG to finish welding so as to form a first root base coat in the welding process; and then finishing a second middle wire feeding welding layer, a third cosmetic wire feeding welding layer and a fourth cosmetic wire feeding welding layer by automatic impulse synchronous wire feeding argon-arc welding. The invention has the advantages of realizing automatic impulse argon-arc welding barrier-freespin welding used for the electrically heated element bushing with more amount, complex arrangement and welding blind area existence and the reducing bushing thereof, improving the primary welding qualification rate, controlling the welding deformation by selecting a reasonable parameter of an automatic welding process, lowering the operation difficulty and the labor intensity of welders, reducing the correction of deformation after welding, and improving the production efficiency.