This paper presents an experimental study on the dynamic contact stiffness and damping characteristics of hybrid lubricated mechanical motion joint surfaces formed by machine tool sliding guides. A parameter testing system was established, utilizing m + p signal acquisition analysis as its centerpiece. In addition, platform for static/dynamic basic designed developed. Utilizing platform, investigation has delineated substantial influence exerted critical parameters, including preload between...

Abstract Autonomous vehicles for the intention of human behavior estimated traffic participants and their interaction is main problem in automatic driving system. Classical cognitive theory assumes that completely reasonable when studying estimation interaction. However, according to quantum cognition decision as well practical cases, including often unreasonable, which violates classical theory. Based on theory, this paper studies pedestrian crossing. Through case analysis, it proved...

The recovery behavior and selected mechanical properties were studied for Populus tomentosa wood subjected to surface compression followed by heat treatment. of was carried out in an open hot-pressing system at 180 °C with compressed thickness 2 18 mm. surface-compressed treated atmospheric treatment or 0.30 MPa pressurized superheated-steam h. results showed that the set decreased increasing before post-treatment. Atmospheric reduced average significantly from 12.9% 4.1% 1.5% respectively,...

Abstract By regulating preheating time, effects of water/moisture immigration and distribution in wood on sandwich compression formation were investigated this study. Kiln-dried poplar was first immersed water to result high moisture content (MC) layers surfaces. These specimens then conditioned at room temperature sealed plastic bags preheated with hot press platens 180 °C drive into wood. Wood for 10–600 s contained one two MC all the time. Extended time moved from surfaces center....

A grooved texture surface was fabricated to enhance the wear resistance of guide rail molding machine. The effects sand concentration in oil and groove width on tribological properties were studied using a pin-on-disk tribometer. Surfaces with widths 1000 μm (S1) 1500 (S2) had lower friction coefficient better anti-wear than non-grooved textured (S0) when lubricated 0% 5% sand–oil mixture. However, rate S1 S2 higher those S0 increased 10%. enhanced under low because grooves captured particle...

Higher-order information brings significant accuracy gains in semantic dependency parsing. However, modeling higher-order is non-trivial. Graph neural networks (GNNs) have been demonstrated to be an effective tool for encoding many graph learning tasks. Inspired by the success of GNNs, we investigate improving parsing with encoded multi-layer GNNs. Experiments are conducted on SemEval 2015 Task 18 dataset three languages (Chinese, English, and Czech). Compared previous state-of-the-art...

Shape stability is one of the most important properties surface-compressed wood used as a substitute for other energy-intensive adhesives, concrete, and metals. This study evaluated dimensional stability, surface wettability, chemical structure, cellulose crystalline microstructure wood. The was then treated with pressurized superheated steam. equilibrium moisture content, thickness swelling ratio, wettability decreased by 20.39%, 30.63% (moisture absorption), 40.51% (water 86.95% after...

Recently, the safety of workers has gained increasing attention due to applications collaborative robots (cobot). However, there is no quantitative research on impact cobot behavior humans' psychological reactions, and these results are not applied motion planning algorithms. Based concept gravity field, this paper proposes a model field (PSF), designs comprehensive experiment different speeds minimum distances when approaching head, chest, abdomen, obtains ordinary surface equation stress...

Effects of preheating times (4, 8, and 12 min), temperatures (75–210 °C, with 15 °C interval), their interactions on structures density profiles sandwich compressed poplar wood (Populus × euramericana cv. 'Neva') were studied to achieve better control the position(s) layer(s), aim utilization low-density resources. Our findings revealed that, as a result temperature elevation or time extension, layers move gradually from surfaces interior center, forming three types wood, namely, surface...

In order to establish the tangential contact stiffness and damping model of solid–liquid interface by exciting vibration force under mixed lubrication, finite difference method was firstly used solve average flow equation considering effect roughness on lubrication effect, bearing capacity, shear force, friction coefficient oil film were obtained, thereby dynamic harmonic excitation calculated. Then, according relationship between normal deformation load solid microconvex body in...

The bounded rational properties of humans in human-robot collaboration (HRC) is a fundamental reason for collisions proximity HRC. As HRC scenarios manufacturing become increasingly popular, robot action decision-making needs to consider such humans. In previous studies, are usually considered as agents whose behaviors predictable and planned, but susceptible distractions caused by external disturbances, different cognitive processes the task can produce unpredictable behaviors. To better...

Most natural language processing (NLP) tasks suffer performance degradation when encountering long complex sentences, such as semantic parsing, syntactic machine translation, and text summarization. Previous works address the issue with an intuition of decomposing sentences linking simple ones, RST-style discourse split-and-rephrase (SPRP), simplification (TS), simple-sentence-decomposition (SSD), etc. However, these are not applicable for parsing like abstract meaning representation (AMR)...

Most natural-language-processing (NLP) tasks suffer performance degradation when encountering long complex sentences, such as semantic parsing, syntactic machine translation, and text summarization. Previous works addressed the issue with intuition of decomposing sentences linking simple ones, rhetorical-structure-theory (RST)-style discourse split-and-rephrase (SPRP), simplification (TS), sentence decomposition (SSD), etc. However, these are not applicable for parsing abstract meaning...

This research investigates the mixed lubrication of anisotropic non-Gaussian rough surfaces. An adaptive fluid Reynolds equation is proposed, which takes into account multiple factors such as pressure-flow factors, contact and shear flow factors. The aim to evaluate performance surfaces with transverse longitudinal textures. We find that statistical parameters asperities height distribution on exert a crucial influence performance, kurtosis skewness proving be particularly significant....

The effects of yield stress poplar ( Poplar × euramericana cv. ‘Neva’) on temperature (60–210°C), moisture content (oven dry-30%) and grain response mechanism as well its role in the formation sandwich compressed wood were studied this paper. results showed that was significantly affected by content(MC), their interaction. Compared with temperature, relative change rate nearly 10 times higher for each 1% increase MC than 1°C temperature. experimental data revealed depended softening effect...