3,231 research outputs found
Influence of processing parameters on forming quality of non-circular spinning
Processing parameters have great influence on forming quality of non-circular spinning. Finite element simulation model of non-circular spinning for the three straight-edge round-corner cross-section (TSRC) hollow-part was established. Variation rules of thickness and springback of TSRC spun workpiece under different processing parameters were obtained by means of orthogonal test as well as the software MSC.MARC. The results show that the influences of the relative clearance ΔC and the feed ratio of roller fz on the maximum wall thickness thinning ratio δt are obvious, and the influences of n and Dr are slight; the influences of the nose radius of roller rρ on the springback angle Δα is the most obvious, and the influences of ΔC and Dr are slight
Algebraic Structure of Discrete Zero Curvature Equations and Master Symmetries of Discrete Evolution Equations
An algebraic structure related to discrete zero curvature equations is
established. It is used to give an approach for generating master symmetries of
first degree for systems of discrete evolution equations and an answer to why
there exist such master symmetries. The key of the theory is to generate
nonisospectral flows from the discrete spectral
problem associated with a given system of discrete evolution equations. Three
examples are given.Comment: 24 pages, LaTex, revise
Research on forming quality of poly-wedge pulley spinning
As an important power transmission part, pulleys are widely used in automobile industry, agricultural machinery, pumps and machines. A near-net forming process for six-wedge belt pulleys manufacturing was put forward. For this purpose, the required tooth shape and size can be formed directly by spinning without machining. The whole manufacturing procedures include blanking, drawing and spinning. The spinning procedure includes five processes, performing, drumming, thickening, toothing and finishing. The forming defects occurred during each forming processes of poly-wedge pulley spinning, such as the drumming failure, flanged opening-end, folded side-wall, insufficient bottom size, flashed opening-end, cutting-off bottom, are introduced, and the factors influencing the defects are analyzed. The corresponding preventive measures are put forward
The 2nd Place Solution for 2023 Waymo Open Sim Agents Challenge
In this technical report, we present the 2nd place solution of 2023 Waymo
Open Sim Agents Challenge (WOSAC)[4]. We propose a simple yet effective
autoregressive method for simulating multi-agent behaviors, which is built upon
a well-known multimodal motion forecasting framework called Motion Transformer
(MTR)[5] with postprocessing algorithms applied. Our submission named MTR+++
achieves 0.4697 on the Realism Meta metric in 2023 WOSAC. Besides, a modified
model based on MTR named MTR_E is proposed after the challenge, which has a
better score 0.4911 and is ranked the 3rd on the leaderboard of WOSAC as of
June 25, 2023
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