33results about How to "Reduce the amount of real-time calculation" patented technology

The invention discloses a three-dimensional map line element note automatic placing method, can be applied to automatically placing and adjusting writing nodes in a three-dimensional geographic scene. The method comprises the following stages of 1, pretreatment stage: attaching note reference lines to the surface of the earth, and building a note reference line layered tree structure; 2, a parallel traversal screening stage: dynamically building view point related reference lines, and executing shielded cutting based on a shadow map and monotonicity segmentation of the reference lines; and 3, a screen space note confliction processing stage: projecting the reference lines to a screen space, processing mutual confliction relation between the notes, and generating a renderable note object. By dynamically building the view point related note reference lines, the note automatic placing method can adapt to different view distance and variations of the viewing angle, and reflect the trend of line elements; in addition, shielding of surface features on the notes is avoided due to shielded cutting based on the shadow map, and the problem of confliction between the notes is solved by using a non-backtracking graph coloring algorithm in the screen space.

The invention relates to an adaptive alignment method under the fixed earth coordinate system, the steps: (1) select the earth fixed coordinate system as the navigation coordinate system, and use the additive quaternion of position error, velocity error and attitude misalignment angle The numerical error is used as the system state variable. (2) The state equation consists of position error equation, linearized velocity error equation and attitude error equation. (3) Using the velocity and position observation information of the GNSS receiver to construct the observation equation. (4) Design an adaptive linear Kalman filter algorithm for initial alignment. The invention does not require static leveling, the amount of real-time calculation is small, the alignment process converges quickly, and the alignment accuracy is high.

The digital method includes following steps: after power on, protector calculates value 1 of formula expressed in the invention; collecting current value at side of electromotor and calculating positive sequence current and negative sequence current; determining whether positive sequence current is larger than 0.06 time of rated current at secondary side of current transformer, and determining states of electromotor: in starting state or in operating state or stop state; calculating formatted heat value in each state respectively; cumulating formatted heat value in each state; determining whether the cumulated value is larger than or equal to value 2 expressed in the invention to decide whether to stop electromotor; after stopping motor, cumulating formatted heat value continuously; determining whether formatted heat value is smaller than value 3 to decide whether to restart motor is allowed. The method reduces quantity of real time computation and required calculation speed.

The invention discloses a resistance spot welding nugget diameter predicting method to solve the technical problems that the practicality of an existing resistance spot welding nugget diameter predicting method is poor. According to the technical scheme, electrode pressure signals are acquired in real time, a unary linear regression equation between the nugget diameter and the electrode pressure change curve rising slope is established, and the real-time predicting of the nugget diameter is achieved. A pressure sensor arranged between a bottom electrode holding rod and a bottom electrode of aspot welding machine is used for acquiring the electrode pressure signals, the sensor installation position is close to a welded workpiece, the effects caused by imbalance of stress in the movement process are reduced, the actual change situation of electrode pressure in the welding process is precisely measured, and the smelting amount of metal is accurately reflected in real time. By means of the unary linear regression equation between the nugget diameter and the electrode pressure change curve rising slope, online and rapid nugget diameter prediction is achieved; and by means of the resistance spot welding nugget diameter predicting method, the nugget diameters of quenched steel, low-carbon steel, stainless steel, an aluminum alloy and other metal materials can be predicted, and the practicality is good.