Study on adverse effect suppression of hub motor driven vehicles with inertial suspensions

2021 ◽  
pp. 095440702110292
Author(s):  
Xiaofeng Yang ◽  
Hang Song ◽  
Yujie Shen ◽  
Yanling Liu
Keyword(s):  
Adverse Effect ◽  
Adverse Effects ◽  
Industrial Development ◽  
Ride Comfort ◽  
Vertical Motion ◽  
Theoretical Research ◽  
Body Acceleration ◽  
Vehicle Suspension System ◽  
The Impact ◽  
Unsprung Mass

With increasingly severe energy supply and environmental pollution, Hub Motor Driven Vehicle (HMDV) have become the ideal configuration for future electric vehicles. The adverse effect caused by the significant increase in HMDV unsprung mass directly affects the vehicle ride comfort and handling stability, becomes a technical bottleneck for theoretical research and industrial development to be solved urgently. The HMDV adverse effect should be suppressed by the vehicle suspension system, which can be classified as vertical motion inertia instability caused by the increase of unsprung mass, but the lack of inertial elements in the conventional suspension “damping-spring” structure restricts the overall performance of the suspension. Therefore, the inertial suspension containing the inertial element “inerter” is utilized to effectively distribute the HMDV vertical motion inertia to suppress its adverse effects. First, the adverse effects of increased unsprung mass on vehicle ride comfort and road friendliness are studied. Then, the inertial suspension models of different structures are established and their impedance expressions are derived. Thirdly, the impact of the inertance in the inertial suspension on the suppression of the HMDV adverse effect is studied. Finally, the particle swarm optimization algorithm is utilized to optimize the parameters of the inertial suspension to improve the performance of the suspension. The results show that the inertial suspension can reduce the RMS value of body acceleration and dynamic tire load. The RMS value of body acceleration and dynamic tire load of the L4 structure is reduced by 8.1% and 16.38% respectively. It shows that the inertial suspension can effectively suppress the HMDV vertical adverse effect, improve the HMDV ride comfort and road friendliness, and lay the foundation for the subsequent suppression research.

Design and Posture Control of a Wheel-Legged Robot With Actively Passively Transformable Suspension System

2020 ◽  
Vol 13 (1) ◽  
Author(s):  
Liwei Ni ◽  
Fangwu Ma ◽  
Linhe Ge ◽  
Liang Wu
Keyword(s):  
Complex Terrain ◽  
Vibration Isolation ◽  
Dynamic Models ◽  
Ride Comfort ◽  
Suspension System ◽  
Posture Control ◽  
Theoretical Research ◽  
Legged Robot ◽  
Passive System ◽  
The Impact

Abstract This paper presents a novel solution for the posture control and ride comfort between the proposed wheel-legged robot (four wheel-legged robot (FWLR)) and the unstructured terrain by means of an actively passively transformable suspension system. Unlike most traditional robots, each leg of FWLR is independent of each other with a spring-damping system (passive system) is connected in series with an actuator (active system), so the posture control and ride comfort in complex terrain can be realized by the combination between active and passive systems. To verify the performance of posture control in complex terrain, a prototype and complex terrain are established first, then a posture control model, algorithm, and controller considering the suspension system are proposed and verified by the comparison between co-simulation and experiment, the results showed that the pitch angle and roll angles in complex terrain can be controlled. To show the impact of the actively passively transformable suspension system on ride comfort (vibration isolation performance), different dynamic models with different degree-of–freedom (DOF) are established, the co-simulation results showed that the passive system and active posture control system can also effectively improve the ride comfort of FWLR in complex terrain. The research results of this paper have important reference significance and practical value for enriching and developing the mechanism design and theoretical research of wheel-legged robot and promoting the engineering application of all-terrain robot.

Fuzzy Control of Vehicle Suspension System

2011 ◽  
Vol 383-390 ◽  
pp. 2012-2017 ◽  
Author(s):  
Guo Quan Yang ◽  
You Qun Zhao
Keyword(s):  
Fuzzy Control ◽  
Ride Comfort ◽  
Fuzzy Controller ◽  
Suspension System ◽  
The Body ◽  
Vehicle Body ◽  
Vehicle Suspension ◽  
Body Acceleration ◽  
Vehicle Suspension System ◽  
Fuzzy Logic Technique

In this paper, a semi-active suspension system has been proposed to improve the ride comfort, and a 2 DOF vehicle system is designed to simulate the actions of vehicle suspension system. The purpose of a suspension system is to support the vehicle body and increase ride comfort. The aim of the work described in the paper was to illustrate the application of fuzzy logic technique to the control of a continuously damping automotive suspension system. The ride comfort is improved by means of the reduction of the body acceleration caused by the car body when road disturbances from smooth road and real road roughness. Based on MATLAB fuzzy control toolbox, fuzzy controller is designed. Simulation analysis of suspension system is preceded by using MATLAB/Simulink7.0. The result shows that this control can improve the body acceleration, suspension distortion etc.

scholarly journals Ch.12 Control of Restrictive Practices in Contractual Licences

2020 ◽  
Author(s):  
Correa Carlos Maria
Keyword(s):  
Adverse Effect ◽  
Developing Countries ◽  
Intellectual Property ◽  
Adverse Effects ◽  
Property Rights ◽  
Intellectual Property Rights ◽  
Trips Agreement ◽  
Relevant Market ◽  
Dissemination Of Technology ◽  
The Impact

This chapter discusses Article 40 of the Trade-related Aspects of Intellectual Property Rights (TRIPS) Agreement, which is the outcome of a proposal originally made by developing countries, which were concerned about the impact of strengthened intellectual property rights (IPRs) on the conditions of voluntary licenses. Article 40.1 recognizes that some licensing practices pertaining to intellectual property rights which restrain competition ‘may have adverse effects on trade and impede the transfer and dissemination of technology’. Meanwhile, unlike most provisions of the TRIPS Agreement, Article 40.2 does not contain specific obligations. It expressly allows countries to adopt measures to control or prevent certain practices or conditions relating to licensing agreements. Judgement of whether they should be controlled or prevented is based on three elements. Contractual practices or conditions should: be examined in each particular case; constitute an ‘abuse’ of intellectual property rights; and have an ‘adverse effect on competition in the relevant market’.

scholarly journals Influence of a Vibration Isolation System on Planar Dynamics of a Motorcycle

2020 ◽  
Vol 25 (1) ◽  
pp. 96-103
Author(s):  
Sudhir Kaul
Keyword(s):  
Simple Model ◽  
Design Process ◽  
Dynamic Characteristics ◽  
Vibration Isolation ◽  
Ride Comfort ◽  
Isolation System ◽  
Vibration Isolation System ◽  
Natural Modes ◽  
The Impact ◽  
Unsprung Mass

This paper examines a model to investigate the impact of a vibration isolation system on the planar (in-plane) dynamics of a motorcycle. While it is not very common, a vibration isolation system is used in some motorcycles to mitigate vibrations resulting from the shaking forces of the engine. For such layouts, the powertrain is assembled to the frame through the vibration isolation system that typically consists of two to four isolators. It is critical to comprehend the influence of the isolation system on the overall dynamic characteristics of the motorcycle due to the coupled dynamics of the rear suspension, the isolation system, and the rear unsprung mass. The influence of a vibration isolation system on the in-plane dynamics is analysed by using a relatively simple model that has been developed in this study. This model has been used to evaluate the influence of the isolation system on natural modes, transmissibility, and ride comfort. Results indicate that the use of a vibration isolation system couples the rear unsprung hop to the pitch motion of the powertrain with a slight increase in the corresponding natural frequency. Results indicate that the use of a vibration isolation system directly affects handling of the motorcycle. Furthermore, results indicate that the pitch of the sprung mass and the hop of the rear unsprung mass are particularly influenced by the vibration isolation system. The model presented in this paper could be useful in the early stages of the design process to compare the rigidly mounted powertrain to different layouts of the vibration isolation system.

Simulation Research on the Performance of Vehicle Suspension System

2013 ◽  
Vol 798-799 ◽  
pp. 378-381
Author(s):  
Li Hong Zhou
Keyword(s):  
Transfer Function ◽  
Ride Comfort ◽  
Suspension System ◽  
The Body ◽  
Vehicle Suspension ◽  
Simulation Research ◽  
Body Acceleration ◽  
Suspension Spring ◽  
Evaluation Indexes ◽  
Vehicle Suspension System

Simulation study of the quarter car model was carried out in this paper. The influence of the stiffness of the suspension spring and the damping on the performance of vehicle suspension system was analyzed by the evaluation indexes: transfer function of body acceleration, transfer function of suspension dynamic stroke, transfer function of tire dynamic deflection. The simulation results shown that increasing the stiffness of the suspension spring would reduce the vehicle's ride comfort and increase the value of the first natural frequency of the sprung mass. And increasing the damping would reduce the peak response of the body acceleration which increasing the vehicle's ride comfort, but at the cost of increasing the high frequency vibration.

The impact of the new media on public relations in the public administration in Kurdistan Region

2019 ◽  
Vol 7 (1) ◽  
pp. 268-288
Author(s):  
Dlan Ismail Mawlud ◽  
Hoshyar Mozafar Ali
Keyword(s):  
Information Technology ◽  
New Media ◽  
Public Relations ◽  
Public Administration ◽  
Management System ◽  
Theoretical Research ◽  
Kurdistan Region ◽  
The Public ◽  
Government Institutions ◽  
The Impact

The development of technology, information technology and various means of communication have a significant impact on public relations activity; especially in government institutions. Many government institutions have invested these means in their management system, in order to facilitate the goals of the institution, and ultimately the interaction between the internal and external public. In this theoretical research, I tried to explain the impact of the new media on public relations in the public administration, based on the views of specialists. The aim of the research is to know the use of the new media of public relations and how in the system of public administration, as well as, Explaining the role it plays in public relations activities of government institutions. Add to this, analyzing the way of how new media and public relations participate in the birth of e-government. In the results, it is clear that the new media has facilitated public relations between the public and other institutions, as it strengthened relations between them

The impact of the digital economy on the development of Russian industry

2018 ◽  
Vol 34 (1) ◽  
pp. 3-9
Author(s):  
M. S. Abrashkin ◽  
A. A. Vershinin
Keyword(s):  
Automotive Industry ◽  
Industrial Production ◽  
Industrial Development ◽  
Digital Economy ◽  
Domestic Economy ◽  
Theoretical Substantiation ◽  
Russian Industry ◽  
Technological Structure ◽  
The Impact ◽  
Technological Paradigms

The article analyzes the market of computer technologies. The theoretical substantiation of the scientific category «digital economy» and its economic components was given. Identified patterns of development of the domestic economy on the basis of informatization, the change of technological paradigms and the dynamics of industrial production. Based on the materials of the automotive industry, the influence of the digital economy on the internal industrial and technological structure of the industry and the results of its activities was proved. Also, the paper presents the main problems of sustainable industrial development in the context of socio-technical and economic means of developing science and technology in Russia.

scholarly journals Improving Drought Tolerance in Mungbean (Vigna radiata L. Wilczek): Morpho-Physiological, Biochemical and Molecular Perspectives

Agronomy ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1534
Author(s):  
Chandra Mohan Singh ◽  
Poornima Singh ◽  
Chandrakant Tiwari ◽  
Shalini Purwar ◽  
Mukul Kumar ◽  
...  
Keyword(s):  
Drought Stress ◽  
Drought Tolerance ◽  
Crop Production ◽  
Mitigation Strategies ◽  
Theoretical Research ◽  
Whole Genome Sequence ◽  
Complex Nature ◽  
Drought Tolerant ◽  
Breeding Programmes ◽  
The Impact

Drought stress is considered a severe threat to crop production. It adversely affects the morpho-physiological, biochemical and molecular functions of the plants, especially in short duration crops like mungbean. In the past few decades, significant progress has been made towards enhancing climate resilience in legumes through classical and next-generation breeding coupled with omics approaches. Various defence mechanisms have been reported as key players in crop adaptation to drought stress. Many researchers have identified potential donors, QTLs/genes and candidate genes associated to drought tolerance-related traits. However, cloning and exploitation of these loci/gene(s) in breeding programmes are still limited. To bridge the gap between theoretical research and practical breeding, we need to reveal the omics-assisted genetic variations associated with drought tolerance in mungbean to tackle this stress. Furthermore, the use of wild relatives in breeding programmes for drought tolerance is also limited and needs to be focused. Even after six years of decoding the whole genome sequence of mungbean, the genome-wide characterization and expression of various gene families and transcriptional factors are still lacking. Due to the complex nature of drought tolerance, it also requires integrating high throughput multi-omics approaches to increase breeding efficiency and genomic selection for rapid genetic gains to develop drought-tolerant mungbean cultivars. This review highlights the impact of drought stress on mungbean and mitigation strategies for breeding high-yielding drought-tolerant mungbean varieties through classical and modern omics technologies.

scholarly journals POS0642 THE IMPACT OF AGE ON DISCONTINUATION OF BIOLOGIC DMARDs IN PATIENTS WITH RHEUMATOID ARTHRITIS

2021 ◽  
Vol 80 (Suppl 1) ◽  
pp. 559.2-560
Author(s):  
V. Rivera Teran ◽  
S. Sicsik ◽  
D. Vega-Morales ◽  
F. Irazoque-Palazuelos ◽  
D. Miranda ◽  
...  
Keyword(s):  
Rheumatoid Arthritis ◽  
Adverse Effects ◽  
Adverse Events ◽  
Cox Regression ◽  
Retention Rate ◽  
Drug Discontinuation ◽  
Discontinuation Rate ◽  
Biologic Dmards ◽  
Conventional Dmards ◽  
The Impact

Background:Rheumatoid arthritis (RA) is the most common autoimmune disease. Older patients treated with biologic DMARDs (bDMARDs) are at a significantly greater risk of adverse effects (AEs) [1]. However, the rate of drug discontinuation because of adverse effects caused by bDMARDs has not differed in elderly compared to younger patients in different registries.Objectives:Determine if drug discontinuation of bDMARDs differs by age in patients with rheumatoid arthritis in the Mexican Adverse Events Registry (BIOBADAMEX).Methods:BIOBADAMEX is a Mexican ongoing cohort of patients using bDMARDs since 2016. In this analysis we included all patients with diagnosis of RA with at least two assessments. Survival on bDMARDs was estimated using Kaplan-Meier analysis. Predictors of discontinuation, including age older than median age in the sample were investigated by Cox regression analyses.Results:Among 743 patients in the registry, 497 had RA diagnosis, from which, 214 had at least two assessments. At baseline, patients had a median (IQR) age of 53.4 (45-61) years old, median disease duration of 10.7 (6-17) months and median DAS28 of 4.7 (3-6). Conventional DMARDS were used by 185 (87%) patients and 94 (44%) patients used corticosteroids. Comorbidities were present in 194 (91%). The most common bDMARDs received at baseline were abatacept 59 (27%), tocilizumab 45(21%), adalimumab 31 (15%) and certolizumab 30 (14%). At the time of analysis, the median bDMARDs treatment duration was 21.0(13-34) months, 128 (59%) had discontinued treatment, 66 for inefficacy, 32 for adverse events and 30 for others. Fig 1 shows discontinuation rate curves in patients younger and older than median age. Cox proportional-hazards demonstrated no significant differences regarding age older than median age (HR 1.1, 95% CI 0.8-1.4, p=0.7), female sex (HR 1.2, 95% CI 0.7-1.9, p=0.44), use of corticosteroids (HR 1.2, 95% CI 0.9-1.6, p=0.20), comorbidities (HR 0.9, 95% 0.6-1.5, p=0.78), DAS28 (HR 0.9, 95% 0.9-1.1, p=0.93) or other factors.Figure 1.Discontinuation rate curves in patients younger and older than median age (< 53.4 and >=53.4 years old)Conclusion:This analysis did not show a role of age on discontinuation of bDMARDs in Mexican RA patients. Further longitudinal analyses will be performed including more patients to assess retention rate of bDMARDs and identify predictive variables of discontinuation in Mexican population.References:[1]Akter R, et al. Can Geriatr J. 2020 May 1;23(2):184-189.[2]Ikari Y, et al. Medicine (Baltimore). 2020 Dec 24;99(52):e23861.Disclosure of Interests:None declared

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