Premise of the Study Various nondestructive testing technologies have been used for detecting and visualizing internal defects in urban trees. The results obtained by using different tools can be interpreted ways, which may result inaccurate assessment true condition inspected main objective this study was to evaluate reliability acoustic tomography ground‐penetrating radar ( GPR ) technology decay a number tree species. Methods One hundred forty‐seven individual trees 33 species were at...

Influence function method is a common to calculate the roll system deformation. It solves after discretizing rollers load and elastic deformation, but traditional influence doesn't consider whether width of rolled piece equal integral multiple divided units length, therefore it only can solve approximately, which affects calculation accuracy. According accuracy loss problem algorithm, paper puts forward solution with advanced structure deal left pieces division. The self-adapts changes...

For cold rolling process, the theoretical Bland-Ford-Hill model and Hitchcock are used for force roll flatten radius calculation. Friction coefficient deformation resistance calculated with empirical regression models. From model, recalculation friction can be derived. After rolling, actual measured data, recalculated, parameter got by method. The practical application verifies that accuracy of calculation is good.

Rolling force model is the core of all mathematical models plate for rolling process, but accuracy traditional not high enough in application, so this study researched and improved. The effects different physical conditions on resistance deformation are decoupled, formula acquired practical. While composition, Nb used to calculate residual strain. At same time, self-learning method, which based thickness layer applied. on-line application results show that predictive error between calculated...

In plate rolling, the existence of some asymmetry rolling conditions, affects distribution transversal thickness pieces, leading to occurrence camber phenomenon, which in turn seriously affect product's material yield. this paper, based on images plates production line collected by camera, taking into account requirements for on-line measurement, filtering noise from image information, use edge detection operator, Hough transform methods and sub pixel location method identify steel plates,...

Rolling force is the most important technical parameter for tandem cold mill. In this paper, precise models and calculation process rolling are introduced. The model based on Bland-Ford Hill theory, roll flatten radius calculated with Hitchcok’s formula. deformation resistance of strip model, whose parameters decided according to steel grade. friction coefficient built speed rolled length roll. iterative method. These used online control one five-stand Comparing result actual data, precision high.

Aiming at the camber problem caused by plate mill’s stiffness difference, this paper put forwards an online compensation method for difference. Based on detective actual rolling force in process, calculate spring of driving side and non-driving to get gap value Via mill AGC system adjust two sides’ difference online, eliminate additional Online algorithm embeds basic automation directly. With going update values constantly according changes order increase stability decrease process.

Pilot hot rolling mill is developed with perfect measuring devices and automation system. The experimental studies of the plate strip can be done on this mill. Automation system for pilot composed Basic System (BAS), Process Control (PCS) Human Machine Interface (HMI). PC server used as PCS hardware, Microsoft software operation developing software. With coordination functions such date communication, process tracking, data management, model calculation, function realized. effect calculation...

In the rolling process of heavy plate mill, longitudinal extension will result in differences at different positions lateral direction pieces. This difference is affected due to some asymmetric conditions, which lead camber. Lateral based on image processing algorithm measured by using images acquired during with help linear array camera. combination camber correction model deducted and feedback control system developed realize automatic for production this paper. Field applications show...

Pilot cold rolling mill is the important tool for process researching and new steel grade development. According to design of type direct pulling pilot mill, based on mass flow constant principle, strip exit thickness indirect measurement method studied. During rolling, entry speed can be calculated accurately according measured value two sides’ clamps movement. Data filtering treatment adopted program chart designed. Based material manually, all passes indirectly. This has been applied...

According to the requirement pilot mill for cold rolling process research work, new type reverse is designed. Computer control system, including primary automation system and human machine interface (HMI) developed this mill. Technological function such as electric position control, hydraulic tension automatic gauge (AGC), functions model setup calculation, tracking, actual data treatment are realized. This has been used successfully in several iron steel companies.

High strength steels, such as austenitic stainless steel, Transformation Induced Plasticity (TRIP) steel and silicon have significant work hardening during cold rolling, which in turn induces a quickly increased rolling force. Tension plays very important role the reduction of However, coiler tension control system used classic experimental mill requires long-scale strip, cannot be satisfied for most cases. To overcome this drawback, new pilot has been developed. The horizontally located...

The model parameters value of deformation resistance determines the prediction accuracy rolling force during plate rolling. According to influencing factors analysis calculation error, genetic algorithm was introduced into self-learning method resistance, and searches optimal on basic space exploration optimization ability algorithm. decision variable selection, coding decoding, fitness evaluation terminal conditions process were implemented development system. results show that speed can...