INFLUENCE OF COMPLIANCE FOR AN ELASTOKINEMATIC MODEL OF A PROPOSED REAR SUSPENSION

The research is carried out to improve passenger’s comfort to increase the vehicles stability in dynamic conditions. The literature available in the automotive engineering considers different topics for studying suspensions. An example represents mechanisms structure and analysis (synthesis, kinematics, and dynamics) under various operating conditions. These aspects have been approached before analytically, numerical. The current paper studies the influence of the lateral force on the contact patch of the wheel and the corresponding variations of vehicle stability parameters, such as camber angle and wheel rear track. The study is performed for a newer innovative rear suspensions mechanism which does not have a wheel track and camber angle variation, relative to the chassis, when the suspension components was considered rigid. A numerical solution is obtained through a virtual model on several commercial codes: MSC Adams, Patran, Nastran. Concerning the analysed parametes, their variation increases as the applied force is increased. Moreover, the largest variation corresponds to the case were elastic bushings and deformable links are considered

STUDY OF NEW AUTOMOTIVE REAR SUSPENSION MECHANISM

The paper presents firstly an introduction discussing: the problem’s statement emphasizing the actual problem of research of passenger car suspension to improve driving comfort and dynamic of the vehicle movement; aspects regarding the studies of car suspension mechanisms; the paper’s aims and objectives showing that a new configuration of suspension mechanism having in structure mobile frame and an actuator offering some important operational advantages is proposed. After this, the innovative concept is presented. The motions of mechanism elements and actuator and kinematic displacements are largely presented. The simulation using modern software (MSC Patran 2007, MD R2 Nastran and MSC ADAMS/View) accentuates the actuality of the results, which are presented and discussed for an application. Final conclusions are given

THE ORGANIZATION AND TECHNICAL EQUIPMENT OF AN ECO-FRIENDLY LANDFILL FOR URBAN WASTE MATTER

The paper outlines the totality of measures taken in order to determine, provide and coordinate the tools for building, expanding and exploiting an urban waste matter landfill. In order to solve the waste issue we must start with the flow circuit, from the generating factors to the final processing. Urban waste matter is mainly generated by the large public. In Romania, due to the extremely low level of civic education, the public is less receptive to new and not willing to take responsibility for its actions. The research described in this paper is aimed for the construction of an eco-friendly landfill having as model the Iridex landfill. This eco-friendly landfill is made from a number of cells that are closing after becoming full. We based our choice on technical and economic benefits

A combination of imaging techniques for dental medicine: from X-rays radiography and 3D CBCT to OCT

The assessment of dental issues is done nowadays both clinically and radiologically. The latter includes radiographs that are based on X-ray radiation, i.e. intraoral radiography, panoramic radiography, and three-dimensional (3D) cone beam computed tomography (CBCT). In several cases, radiographs have limitations, as they do not reveal dental issues such as small cavities, enamel cracks, or tooth erosion. These aspects can be visible with another medical imaging technique, Optical Coherence Tomography (OCT). The aim of this study is to present a few results obtained with an in-house developed swept-source OCT (SS-OCT) system on several dental issues that cannot be visible on radiographs. These results prove that OCT can be utilized in dentistry, with advantages such as radiation free technique and superior resolution. This study presents both radiography and OCT images for different dental issues which include small cavities, metal crowns cracks, or crowns manufactured with different materials (i.e., zirconia, ceramics, or composite). Firstly, samples have been analyzed radiologically and some abnormalities could be detected, but they could be correctly assessed. Secondly, these abnormalities have been analyzed with the SS-OCT system and finally all images and collected data from both medical imaging techniques have been compared. One of the conclusions is that OCT is more appropriate than radiography for several dental issues such as those presented in this study. These two medical imaging techniques can therefore be complementary in dental medicine

Energy Efficiency Fairness Beamforming Designs for MISO NOMA Systems

In this paper, we propose two beamforming designs for a multiple-input single-output non-orthogonal multiple access system considering the energy efficiency (EE) fairness between users. In particular, two quantitative fairness-based designs are developed to maintain fairness between the users in terms of achieved EE: max-min energy efficiency (MMEE) and proportional fairness (PF) designs. While the MMEE-based design aims to maximize the minimum EE of the users in the system, the PF-based design aims to seek a good balance between the global energy efficiency of the system and the EE fairness between the users. Detailed simulation results indicate that our proposed designs offer many-fold EE improvements over the existing energy-efficient beamforming designs.Comment: IEEE WCNC 201

Reconfigurable Intelligent Surface-Assisted B5G/6G Wireless Communications: Challenges, Solution and Future Opportunities

The power consumption and hardware cost are two of the main challenges for realizing beyond fifth-generation (B5G) and sixth-generation (6G) wireless communications. Recently, the emerging reconfigurable intelligent surface (RIS) have been recognized as a promising tool for enhancing the propagation environment and improving the spectral efficiency of wireless communications by controlling low-cost passive reflecting elements. However, current cellular communication were designed on the basis of conventional communication theories, significantly restrict the development of RIS-assisted B5G/6G technologies and lead to severe limitations. In this article, we discuss RIS-assisted channel estimation issues involved in B5G/6G communications including channel state information (CSI) acquisition, imperfect cascade CSI for beamforming design and co-channel interference coordination, and develop a few possible solutions or visionary technologies to promote the development of B5G/6G. Finally, potential research opportunities are discussed