3results about How to "Optimize wall thickness" patented technology

The application provides a kind of nonlinear filtering method of pulse eddy current detection signal, belong to nondestructive testing technical field, can at least partially solve the problem that magnetic field decay voltage signal is greatly influenced by noise in pulse eddy current detection, traditional smoothing filter is easy to introduce signal distortion.The method is used for the pulse eddy current detection signal receiving processing of metal structure with cladding layer, comprising: collecting magnetic field decay voltage signal in pulse eddy current detection process;Nonlinear compression transformation is carried out on the time axis corresponding to the magnetic field decay voltage signal;Smooth filtering time window of preset length is set on the time axis after nonlinear compression, and the corresponding conventional time interval is determined;The magnetic field decay voltage signal falling into the conventional time interval is carried out smoothing filter processing, and the filtered pulse eddy current detection signal is obtained.The application makes the filtering process match the time characteristics of the magnetic field decay signal, improves the stability of signal processing, and is beneficial to subsequent wall thickness or state evaluation.

This application relates to the field of alloy steel technology, specifically disclosing an ultra-high strength cast steel base for a high-speed railway permanent magnet traction motor and its preparation method. The ultra-high strength cast steel base for a high-speed railway permanent magnet traction motor is made from a chemical composition comprising the following weight percentages: C 0.15-0.25%, Si 0.2-0.5%, Mn 1.5-2.5%, Cr 0.5-1.25%, Ni 0.3-0.8%, Mo 0.2-0.5%, Al 0.02-0.06%, V 0.05-0.15%, Ti 0.02-0.08%, Nb 0.01-0.05%, P 0.01-0.02%, S 0.005-0.01%, with the balance being Fe. The ultra-high strength cast steel frame for the high-speed railway permanent magnet traction motor of this application achieves ultra-high strength while maintaining excellent plasticity and toughness and extremely high fatigue limit. This allows designers to use thinner and more optimized frame wall thickness while ensuring safety margin, thereby directly achieving the goal of lightweighting and enabling it to cope with the extreme vibration conditions of high-frequency and high-stress cycles of high-speed railway traction motors.

This invention provides a flexible gear and a harmonic reducer having the same. The flexible gear has a cylindrical structure and includes a transmission part. Along the axial direction of the transmission part, the inner peripheral wall of the transmission part has a segmented structure, and the segmented structure includes at least a first shaft segment, a second shaft segment, and a third shaft segment connected in sequence. The average wall thickness of the transmission part at the second shaft segment is not only greater than the average wall thickness of the transmission part at the first shaft segment but also greater than the average wall thickness of the transmission part at the third shaft segment. The outer peripheral wall of the transmission part has external teeth. The first and third shaft segments have unequal inner diameter structures, while the second shaft segment has a constant inner diameter structure. Along the direction from the first shaft segment to the third shaft segment, the inner diameter of the first shaft segment gradually decreases, and the inner diameter of the third shaft segment gradually increases, making it easier for the outer ring of the flexible bearing to be pressed into the inner side of the second shaft segment, and the outer ring of the flexible bearing is interference-fitted with the second shaft segment. This increases the wall thickness of the transmission part at the external teeth, improves the load-bearing strength of the external teeth, and solves the problem of easy cracking of the side wall of the transmission part at the external teeth.