scholarly journals Principal stress lines based design method of lightweight and low vibration amplitude gear web

2021 ◽  
Vol 18 (6) ◽  
pp. 7060-7075
Author(s):  
Ganjun Xu ◽  
◽  
Ning Dai ◽  
Sukun Tian ◽  
Keyword(s):  
Principal Stress ◽  
Vibration Amplitude ◽  
Design Method ◽  
Web Design ◽  
Design Parameters ◽  
The Novel ◽  
Experimental Platform ◽  
Gear Design ◽  
Optimal Distance ◽  
The Relationship

<abstract> <p>A lightweight and low vibration amplitude web design method was investigated to reduce gear weight and noise. It was based upon the relationship between length and orthogonality that the principal stress lines were designed at the gear web. By constructing a vibration control model with gear design parameters, the optimal distance was calculated. By offsetting the principal stress lines at the optimal distance, the lightweight gear web with the low vibration amplitude was then generated. A vibration experimental platform was built to verify the novel gear vibration performances, and it was compared with other gears with the same web's porosity to verify loading performance. The experimental results indicated that compared with the solid gear, the novel gear is 20.50% lighter and with a 29.46% vibration amplitude reduction.</p> </abstract>

Choice of Less-Teeth Gear Parameters Based on MATLAB

2013 ◽  
Vol 385-386 ◽  
pp. 200-202
Author(s):  
Dong Sheng Zhang ◽  
Zhang Lai Lv ◽  
Jian Jun Zhang
Keyword(s):  
Design Method ◽  
Single Stage ◽  
Transmission Ratio ◽  
Light Weight ◽  
Compact Structure ◽  
Gear Design ◽  
Present Design ◽  
Spiral Angle ◽  
The Relationship ◽  
Selection Of

Less-teeth gear is increasingly promoted and applied because of the big single-stage transmission ratio, light weight, compact structure. The selection of gear parameters has been the key and difficult point of the design of less-teeth gear. At present design method involved in less-teeth gear design is rarely existed. According to the relationship between the characteristics and parameters of the less-teeth gear, using MATLAB for the optimization choice of the less-teeth gear, reasonable selection of the spiral angle and modification coefficient is realized, which can provide clues to further research of the less-teeth gear.

Study on Design Method of the Microstructure for Layered and Ring-Shaped Acoustic Cloaking Based on Bimode Metamaterial

2014 ◽  
Vol 684 ◽  
pp. 219-227
Author(s):  
Qian Jin Xiao ◽  
Xiang Dong Zhang ◽  
Jia Chang Qian ◽  
Hong Chen
Keyword(s):  
Theoretical Basis ◽  
Design Method ◽  
Design Methods ◽  
Design Parameters ◽  
Physical Parameters ◽  
Theoretical Design ◽  
Microstructure Model ◽  
Analytic Expression ◽  
Layered Design ◽  
The Relationship

The paper proposes a design method for the layered and ring-shaped acoustic cloaking based on BM. According to the theory of PM cloaking, physical parameters of the ring-shaped acoustic cloaking are given by theoretical design. Further, based on the features of microstructure of BM, the relationship between the parameters of each layer of microstructure of BM and the analytic expression of the physical parameters of acoustic cloaking made of BM is determined, and the design methods for microstructure of layered and ring-shaped acoustic cloaking are discussed, namely, radial equidistant layered design and radial non-equidistant layered design (i.e. equal sectorial angle layered design). At last, according to the radial non-equidistant layered design parameters of the ring-shaped acoustic cloaking, the microstructure model of the layered and ring-shaped acoustic cloaking is designed. The results of the study can serve as theoretical basis for actual production and application of acoustic cloaking.

Uncertainty Considerations in the Dynamics of Gear-Pair

2012 ◽  
Author(s):  
Fisseha M. Alemayehu ◽  
Stephen Ekwaro-Osire
Keyword(s):  
Parameter Uncertainty ◽  
Traditional Approach ◽  
Design Parameters ◽  
Dynamic Factor ◽  
Gear Pair ◽  
The Novel ◽  
Gear Design ◽  
Pair Model ◽  
Multibody Dynamic ◽  
Gear Systems

Gears and Gear systems are subjected to uncertainty of design parameters and loading caused by inherent conditions, measurement and manufacturing errors. Hence, the motivation of this work is to improve the deterministic design practice of gears and gear systems. A probabilistic rigid multibody dynamic gear-pair model with design and load uncertainties has been developed and analyzed. Rigid gear-pair model was developed in multibody dynamics software ADAMS and parameter uncertainty and probabilistic analysis was performed from separate probabilistic software called NESSUS. To perform the probabilistic multibody analysis, ADAMS and NESSUS were interfaced using MATLAB. The effect of parameter uncertainty on dynamic factor, DF of a gear pair was investigated. The sensitivity of DF to five uncertain loading and design parameters were also determined. This paper has demonstrated the importance of the novel PMBD modeling approach to gear design and dynamic factor analysis. The method has brought a new dimension of design approach of gears and gear systems than traditional approach that considers a certain empirically defined dynamic rating factors. In addition to revealing system reliability or under-performance through probability of failure, it also helps designers to consider certain variables critically through the sensitivity results.

scholarly journals Mathematical Model and Geometrical Design Method of Noncircular Face Gear with Intersecting Axes

2020 ◽  
Author(s):  
Dawei Liu ◽  
Zhenzhen Lv ◽  
Guohao Zhao
Keyword(s):  
Mathematical Model ◽  
Fourier Series ◽  
Design Method ◽  
Transmission Mechanism ◽  
Design Parameters ◽  
The Novel ◽  
Face Gear ◽  
Simulation And Experiment ◽  
Pitch Curve ◽  
The Mathematical Model

Abstract In order to establish the design method of a noncircular face gear (NFG) with intersecting axes, the meshing theory of this gear is investigated based on the principle of space gear meshing. A generalized approach for designing closed pitch curve of the NFG with intersecting axes is proposed based on Fourier series. The mathematical model of the NFG generated by a shaper cutter is established. The fundamental design parameters of the gears are defined, with the principle for determining their values discussed. The results of simulation and experiment verify the feasibility of the novel transmission mechanism and the correctness of the mathematical model of NFG with intersecting axes.

Optimal kinematic design of a three translational DoFs parallel manipulator

Robotica ◽  
2005 ◽  
Vol 24 (2) ◽  
pp. 239-250 ◽  
Author(s):  
Xin-Jun Liu
Keyword(s):  
Parallel Manipulator ◽  
Design Space ◽  
Design Method ◽  
Performance Criteria ◽  
Stiffness Index ◽  
Design Parameters ◽  
Kinematic Design ◽  
Normalized Parameters ◽  
The Relationship ◽  
Design Result

In this paper, an optimal kinematic design method of a three translational DoFs parallel manipulator is presented. The design is based on the concept of performance chart, which can show the relationship between a criterion and design parameters graphically and globally. The normalization on the design parameters of the studied manipulator makes it possible that the design space, which is made up of the normalized parameters, is limited. The design space includes of all possible basic similarity manipulators (BSMs). As any one of the BSMs represents all of its similarity manipulators (SMs) in terms of performances, if one BSM is optimal, its SMs are optimized as well. The said optimal BSM is from the optimum region, which is the intersecting result of involved performance charts. In this paper, the related performance criteria are good-conditioning workspace (GCW), global conditioning index (GCI) and global stiffness index (GSI). As an applying example, a design result of the parallel manipulator with a desired task workspace is presented. The results of the paper are very useful for the design and application of a parallel manipulator.

scholarly journals On the Design of a Class of Rotary Compressors Using Bayesian Optimization

Machines ◽  
2021 ◽  
Vol 9 (10) ◽  
pp. 219
Author(s):  
Kui Lu ◽  
Truong H. Phung ◽  
Ibrahim A. Sultan
Keyword(s):  
Black Box ◽  
Bayesian Optimization ◽  
Optimization Process ◽  
Design Parameters ◽  
Mathematical Form ◽  
The Novel ◽  
Numerical Illustration ◽  
Positive Displacement ◽  
Machine Performance ◽  
The Relationship

The optimization process of compressors is usually regarded as a ‘black-box’ problem, in which the mathematical form underlying the relationship between design parameters and the design objective is impractical and costly to be obtained. To solve the ‘black-box’ problem, Bayesian optimization has been proven as an accurate and efficient method. However, the application of such a method in the design of compressors is rarely discussed, particularly no work has been reported in terms of the positive displacement type compressor. Therefore, this paper aims to introduce the Bayesian optimization to the design of positive displacement compressors through the optimization process of the novel limaçon compressor. In this paper, a two-stage optimization process is presented, in which the first stage optimizes the geometric parameters as per design requirements and the second stage focuses on revealing an optimum setting of port geometries that improves machine performance. A numerical illustration is offered to prove the validity of the presented approach.

The role and relationship of mindreading and social attunement in HRI – position statements of interdisciplinary researchers. Workshop HRI'20

2020 ◽  
Author(s):  
Agnieszka Wykowska ◽  
Jairo Pérez-Osorio ◽  
Stefan Kopp
Keyword(s):  
Mental States ◽  
Human Robot Interaction ◽  
Human Interaction ◽  
Artificial Agents ◽  
The Novel ◽  
Robot Interaction ◽  
Novel Coronavirus ◽  
Relationship Of ◽  
The Relationship

This booklet is a collection of the position statements accepted for the HRI’20 conference workshop “Social Cognition for HRI: Exploring the relationship between mindreading and social attunement in human-robot interaction” (Wykowska, Perez-Osorio &amp; Kopp, 2020). Unfortunately, due to the rapid unfolding of the novel coronavirus at the beginning of the present year, the conference and consequently our workshop, were canceled. On the light of these events, we decided to put together the positions statements accepted for the workshop. The contributions collected in these pages highlight the role of attribution of mental states to artificial agents in human-robot interaction, and precisely the quality and presence of social attunement mechanisms that are known to make human interaction smooth, efficient, and robust. These papers also accentuate the importance of the multidisciplinary approach to advance the understanding of the factors and the consequences of social interactions with artificial agents.

Oleanolic Acid Derived from Plants: Synthesis and Pharmacological Properties of A-ring Modified Derivatives

2020 ◽  
Vol 17 (9) ◽  
pp. 1084-1101
Author(s):  
Tingjuan Wu ◽  
Xu Yao ◽  
Guan Wang ◽  
Xiaohe Liu ◽  
Hongfei Chen ◽  
...  
Keyword(s):  
Drug Design ◽  
Oleanolic Acid ◽  
Water Solubility ◽  
Future Application ◽  
The Novel ◽  
Pharmacological Effects ◽  
Framework Structure ◽  
Design And Synthesis ◽  
The Past ◽  
The Relationship

Background: Oleanolic Acid (OA) is a ubiquitous product of triterpenoid compounds. Due to its inexpensive availability, unique bioactivities, pharmacological effects and non-toxic properties, OA has attracted tremendous interest in the field of drug design and synthesis. Furthermore, many OA derivatives have been developed for ameliorating the poor water solubility and bioavailability. Objective: Over the past few decades, various modifications of the OA framework structure have led to the observation of enhancement in bioactivity. Herein, we focused on the synthesis and medicinal performance of OA derivatives modified on A-ring. Moreover, we clarified the relationship between structures and activities of OA derivatives with different functional groups in A-ring. The future application of OA in the field of drug design and development also was discussed and inferred. Conclusion: This review concluded the novel achievements that could add paramount information to the further study of OA-based drugs.

DIAGNOSING QUALITY OF FRICTION SYSTEMS OF MECHANISMS OF DEVICES

2019 ◽  
Vol 1 (7) ◽  
pp. 10-13
Author(s):  
D. Yu. Ershov ◽  
I. N. Lukyanenko ◽  
E. E. Aman
Keyword(s):  
Surface Defects ◽  
Diagnostic Methods ◽  
Design Parameters ◽  
Diagnostic Model ◽  
Mechanical Assemblies ◽  
Local Defects ◽  
Relationship Of ◽  
The Relationship ◽  
Production And Operation

The article shows the need to develop diagnostic methods for monitoring the quality of lubrication systems, which makes it possible to study the dynamic processes of contacting elements of the friction systems of instrument mechanisms, taking into account roughness parameters, the presence of local surface defects of elements and the bearing capacity of a lubricant. In the present article, a modern diagnostic model has been developed to control the quality of the processes of production and operation of friction systems of instrument assemblies. With the help of the developed model, it becomes possible to establish the relationship of diagnostic and design parameters of the mechanical system, as well as the appearance of possible local defects and lubricant state, which characterize the quality of friction systems used in many mechanical assemblies of the mechanisms of devices. The research results are shown in the form of nomograms to assess the defects of the elements of friction mechanisms of the mechanisms of the devices.

The Novel of Sensibility in the 1780s

2018 ◽  
Author(s):  
Caroline Franklin
Keyword(s):  
John Locke ◽  
Adam Smith ◽  
The Novel ◽  
Francis Hutcheson ◽  
Literary Movement ◽  
Epistolary Novels ◽  
The Relationship

This chapter studies the novels of sensibility in the 1780s. The philosophy of John Locke, Anthony Ashley Cooper, third Earl of Shaftesbury, Adam Smith, and Francis Hutcheson had influenced the first wave of epistolary novels of sensibility beginning in the 1740s. These explored the interaction between emotion and reason in producing moral actions. Response to stimuli was minutely examined, especially the relationship between the psychological and physiological manifestations of feelings. Later in the century, and, in particular during the late 1780s when the novel enjoyed a surge in popularity, the capacity for fine feeling became increasingly valued for its own sake rather than moralized. Ultimately, sensibility should be seen as a long-lasting literary movement rather than an ephemeral fashion. It put paternal authority and conventional modes of masculinity under question.

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