scholarly journals A passively adaptive screwdriver: A novel concept for controlling off-diagonal stiffness

2006 ◽  
Vol 220 (2) ◽  
pp. 249-251
Author(s):  
S Ilanko ◽  
D R Aitchison ◽  
H McCallion
Keyword(s):  
Final Stage ◽  
Axial Stiffness ◽  
Driving Mechanism ◽  
Axial Thrust ◽  
Torsional Resistance ◽  
Novel Concept ◽  
Screw Driving

A concept for an automated screw driving mechanism is presented. The proposed mechanism has a self-adjusting axial stiffness that depends on the torsional resistance against screwing. It delivers a greater axial thrust when the torsional resistance is greater, for example, towards the final stage of a screwing operation.

702 Design of Two-degree-of Freedom Control for Ball Screw Driving Mechanism

2005 ◽  
Vol 2005.58 (0) ◽  
pp. 243-244
Author(s):  
Hiroshi HAMAMATSU ◽  
Kohtaro KOYAMA ◽  
Yoshito TANAKA ◽  
Shigeru FUTAMI ◽  
Teruo TSUJI
Keyword(s):  
Degree Of Freedom ◽  
Ball Screw ◽  
Driving Mechanism ◽  
Screw Driving ◽  
Two Degree Of Freedom

scholarly journals A Simplified Measuring Method of Static and Dynamic Characteristics of Ball-screw Driving Mechanism.

1991 ◽  
Vol 57 (9) ◽  
pp. 1645-1650
Author(s):  
Yoshiaki KAKINO ◽  
Ziye LI ◽  
Fumiya YAGI ◽  
Akemi HIGASHIMOTO ◽  
Toshiaki WATANABE ◽  
...  
Keyword(s):  
Dynamic Characteristics ◽  
Measuring Method ◽  
Ball Screw ◽  
Driving Mechanism ◽  
Static And Dynamic Characteristics ◽  
Screw Driving

scholarly journals An improved dynamic model of preloaded ball screw drives considering torque transmission and its application to frequency analysis

2017 ◽  
Vol 9 (7) ◽  
pp. 168781401771058 ◽  
Author(s):  
Fuhua Li ◽  
Yao Jiang ◽  
Tiemin Li ◽  
Yunsong Du
Keyword(s):  
Resonant Frequency ◽  
Dynamic Model ◽  
Dynamic Models ◽  
Experimental Results ◽  
Ball Screw ◽  
Axial Stiffness ◽  
Axial Thrust ◽  
Screw Drive ◽  
Proposed Model ◽  
Ball Screw Drive

A dynamic model of the ball screw drive is proposed in this article. It is revealed that when axial thrust is transmitted between the ball screw and the nut, extra torque is generated synchronously which is not proposed in existing dynamic models. And a physical model for studying the relationship between the thrust and the torque is proposed. A lumped dynamic model is established, and a kinematic compatibility equation describing motion transmission between rotary displacement and axial displacement is established. Then a preload model of a double-nut for analyzing the force and the deformation is built. An approach to analyze the first resonant frequency of the proposed model is described. Meanwhile, a tested bench with a novel preload-adjustable double-nut and two novel loading mechanisms is constructed. The axial stiffness of the supporting bearings and the preloaded double-nut is tested based on a measurement system. Then vibration tests are carried out to measure the first resonant frequency of the ball screw drive. Finally, contrastive analysis between experimental results and simulated results of three models is conducted. The results show that the proposed model agrees much better with the experimental results than the discrete model and the hybrid model do.

The multicompartment SlideReactor – a novel concept for continuous monitoring of co-cultured cells

2009 ◽  
Vol 47 (01) ◽  
Author(s):  
N Billecke ◽  
S Tröller ◽  
N Raschzok ◽  
MH Morgül ◽  
NN Kammer ◽  
...  
Keyword(s):  
Continuous Monitoring ◽  
Cultured Cells ◽  
Novel Concept

Decision making based on intuitionistic fuzzy preference relations with additive approximate consistency

2020 ◽  
Vol 39 (3) ◽  
pp. 4041-4058
Author(s):  
Fang Liu ◽  
Xu Tan ◽  
Hui Yang ◽  
Hui Zhao
Keyword(s):  
Decision Making ◽  
Decision Makers ◽  
Real Interval ◽  
Preference Relations ◽  
Intuitionistic Fuzzy ◽  
Proposed Model ◽  
Fuzzy Preference Relations ◽  
Novel Concept ◽  
Fuzzy Weights ◽  
Fuzzy Preference

Intuitionistic fuzzy preference relations (IFPRs) have the natural ability to reflect the positive, the negative and the non-determinative judgements of decision makers. A decision making model is proposed by considering the inherent property of IFPRs in this study, where the main novelty comes with the introduction of the concept of additive approximate consistency. First, the consistency definitions of IFPRs are reviewed and the underlying ideas are analyzed. Second, by considering the allocation of the non-determinacy degree of decision makers’ opinions, the novel concept of approximate consistency for IFPRs is proposed. Then the additive approximate consistency of IFPRs is defined and the properties are studied. Third, the priorities of alternatives are derived from IFPRs with additive approximate consistency by considering the effects of the permutations of alternatives and the allocation of the non-determinacy degree. The rankings of alternatives based on real, interval and intuitionistic fuzzy weights are investigated, respectively. Finally, some comparisons are reported by carrying out numerical examples to show the novelty and advantage of the proposed model. It is found that the proposed model can offer various decision schemes due to the allocation of the non-determinacy degree of IFPRs.

At the final stage of the global crisis: Economic tasksin 2017-2019

2018 ◽  
pp. 5-29 ◽  
Author(s):  
V. A. Mau
Keyword(s):  
Economic Growth ◽  
Final Stage ◽  
Government Regulation ◽  
Inflation Targeting ◽  
Social Dynamics ◽  
Growth Stimulation ◽  
Central Banks ◽  
Economic Area ◽  
National Trends

The paper deals with the global and national trends of economic and social development at the final stage of the global structural crisis. Special attention is paid to intellectual challenges economists will face with in the post-crisis world: prospects of growth without inflation, new global currencies and the role of cryptocurrencies, central banks independence and their role in economic growth stimulation, new tasks and patterns of government regulation, inequality and growth. Special features of Russian post-crisis development are also under consideration. Among them: prospects of macroeconomic support of growth, inflation targeting, new fiscal rule, social dynamics and new challenges to welfare state. The paper concludes that the main obstacles for economic growth in Russia are concentrated in the non-economic area.

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