A Trajectory Compensation Method Considering the Car-Following Behavior for Data Missing of Millimeter-Wave Radar in Roadside Detection Applications

Concerning roadside traffic detection applications, and to address the millimeter-wave radar’s missing data problem caused by target occlusion or the absence of features in low-speed conditions, this paper proposes a trajectory compensation method regarding car-following behavior. Referring to the installation scheme of the detector, a coordinate transformation method is presented to unify the radar spatial coordinates with the road coordinates. Considering the driver’s car-following behavior, the optimal velocity model (OV), full velocity difference model (FVD), and the full velocity difference and acceleration (FVDA) model are applied for tracking the vehicle’s trajectory related to the movement of the vehicle ahead. Finally, a data compensation scheme is presented. Taking actual trajectory data as samples, the proposed methods are verifiably useful for compensating for missing data and reconstructing target trajectories. Statistical results of different missing data trajectories demonstrate the rationality of the application of car-following models for the missing data compensation, and the FVDA model performs well compared with the OV and FVD models

A Trajectory Compensation Method Considering the Car-Following Behavior for Data Missing of Millimeter-Wave Radar in Roadside Detection Applications

Concerning roadside traffic detection applications, and to address the millimeter-wave radar’s missing data problem caused by target occlusion or the absence of features in low-speed conditions, this paper proposes a trajectory compensation method regarding car-following behavior. Referring to the installation scheme of the detector, a coordinate transformation method is presented to unify the radar spatial coordinates with the road coordinates. Considering the driver’s car-following behavior, the optimal velocity model (OV), full velocity difference model (FVD), and the full velocity difference and acceleration (FVDA) model are applied for tracking the vehicle’s trajectory related to the movement of the vehicle ahead. Finally, a data compensation scheme is presented. Taking actual trajectory data as samples, the proposed methods are verifiably useful for compensating for missing data and reconstructing target trajectories. Statistical results of different missing data trajectories demonstrate the rationality of the application of car-following models for the missing data compensation, and the FVDA model performs well compared with the OV and FVD models

Experimental Study and Simulation-Based Criterion for Stamping Skid Line

Skid lines on the outer panels of automobiles seriously affects their appearance and are a common surface manufacturing defect. In the die and process design stages, numerical simulation is needed to predict skid lines to take prevention measures. However, it is still a challenge to predict skid lines accurately. The simulation-based skid line criteria need further verification and improvement. Therefore, this paper takes a lightweight aluminum alloy AL6061-T6 sheet as its research object, uses a set of U-shaped dies to explore the influence of process parameters on skid lines, and establishes the correlation between skid lines and surface roughness based on visual and microscopic measurements. The relationships between contact pressure/inverse bending strain and surface roughness are established through simulation. Thus, a contact pressure and inverse bending strain dependent skid line criterion is constructed. The skid line criterion based on the simulation results has theoretical, guiding significance for the practice of engineering

Jinan City Land Without Water Port Construction Model

With the global economic integration and the continuous development of the logistics industry, multi-directional transport in the international position is becoming more and more important, the port is the carrier of the development of multi-vehicle transport. The competition of various countries is no longer the competition of the previous infrastructure and operational capacity, and the construction of a waterless port in the inland will become an effective measure for the sustainable development of Jinan. Taking the development of multi-mode transportation in Jinan as the background, this paper analyzes the strategic environment for the development of inland waterless port in Jinan city and the construction mode of inland waterless port in Jinan city by introducing the multi-mode transportation in Jinan area

Wire arc additive manufacturing of porous metal using welding pore defects

A novel wire arc additive manufacturing process is proposed to produce porous metal (PM). The innovation is to convert harmful welding pore defects into a beneficial structure of PM, and then the PM parts can be additive manufactured layer by layer. Air was transferred to the molten pool as pore promoters to maximize the formation of the welding pore defects. The triple-wire indirect arc process was used for fabricating multi-layer parts to reduce interlayer filling. The primary advantage is that the process can directly produce macro-pore structures rather than depositing pore walls along micro paths in laser additive manufacturing. The uniform diameter of the pore ranges from 500 to 2700 μm, and the typical porosity is 64%, 49%, and 87%. The process could achieve a high deposition rate of 11.5 kg/h. Due to martensite formation, the pore walls can achieve high microhardness of over 200 HV

Analysis on the Integration Path of “One Belt And One Road” International Railway Transportation Rules

With the rapid growth of Sino-European international trade and the ongoing development of “One Belt And One Road”, it can be predicted that the status of railway transportation in the international logistics system will be greatly enhanced, which urges us to further study the rules of international railway freight transportation. At present, the pattern of the rules system of international freight transport by railway is the two conventions of the international cargo association and the international cargo contract. In addition, the existing rules system of freight transport by railway in China also has some problems such as being too administrative, which needs to be reformed urgently. By comparing the contents of the two conventions of international railway freight transport and listing the possible conflicts in the substantive laws of various countries involved in the conventions, this paper designs a set of dispute settlement mechanism for “One Belt And One Road” railway transport, and puts forward some suggestions on the integration of the rules of “One Belt And One Road” international railway freight transport

Unveiling potential mechanisms of Spatholobi Caulis against lung metastasis of malignant tumor by network pharmacology and molecular docking

Lung metastasis of malignant tumor signifies worse prognosis and immensely deteriorates patients' life quality. Spatholobi Caulis (SC) has been reported to reduce lung metastasis, but the mechanism remains elusive.Published versionThis article was supported by the National Natural Science Foundation of China (81973640, 81573915)