scholarly journals Influence of smectite suspension structure on sheet orientation in dry sediments: XRD and AFM applications

2010 ◽  
Vol 346 (2) ◽  
pp. 311-316 ◽  
Author(s):  
Marek S. Żbik ◽  
Ray L. Frost
Keyword(s):  
Suspension Structure ◽  
Dry Sediments

A Pneumatic Artificial Muscle Bionic Kangaroo Leg Suspension

2019 ◽  
Vol 12 (4) ◽  
pp. 357-366
Author(s):  
Yong Song ◽  
Shichuang Liu ◽  
Jiangxuan Che ◽  
Jinyi Lian ◽  
Zhanlong Li ◽  
...  
Keyword(s):  
Strong Shock ◽  
Artificial Muscle ◽  
Suspension System ◽  
Vehicle Body ◽  
Vehicle Suspension ◽  
Pneumatic Artificial Muscle ◽  
Advantages And Disadvantages ◽  
Road Excitation ◽  
Vehicle Suspension System ◽  
Suspension Structure

Background: Vehicles generally travel on different road conditions, and withstand strong shock and vibration. In order to reduce or isolate the strong shock and vibration, it is necessary to propose and develop a high-performance vehicle suspension system. Objective: This study aims to report a pneumatic artificial muscle bionic kangaroo leg suspension to improve the comfort performance of vehicle suspension system. Methods: In summarizing the existing vehicle suspension systems and analyzing their advantages and disadvantages, this paper introduces a new patent of vehicle suspension system based on the excellent damping and buffering performance of kangaroo leg, A Pneumatic Artificial Muscle Bionic Kangaroo Leg Suspension. According to the biomimetic principle, the pneumatic artificial muscles bionic kangaroo leg suspension with equal bone ratio is constructed on the basis of the kangaroo leg crural index, and two working modes (passive and active modes) are designed for the suspension. Moreover, the working principle of the suspension system is introduced, and the rod system equations for the suspension structure are built up. The characteristic simulation model of this bionic suspension is established in Adams, and the vertical performance is analysed. Results: It is found that the largest deformation happens in the bionic heel spring and the largest angle change occurs in the bionic ankle joint under impulse road excitation, which is similar to the dynamic characteristics of kangaroo leg. Furthermore, the dynamic displacement and the acceleration of the vehicle body are both sharply reduced. Conclusion: The simulation results show that the comfort performance of this bionic suspension is excellent under the impulse road excitation, which indicates the bionic suspension structure is feasible and reasonable to be applied to vehicle suspensions.

IDENTIFICATION OF VISCOELASTIC MODEL OF FOUR-WIRE SUSPENSION SYSTEM IN OPTICAL PICKUP ACTUATOR

2017 ◽  
Vol 41 (5) ◽  
pp. 731-744
Author(s):  
Ren J. Chang ◽  
Zheng Y. Liu
Keyword(s):  
Transfer Function ◽  
Fractional Derivative ◽  
Dynamic Model ◽  
Classical Model ◽  
Viscoelastic Model ◽  
Optical Pickup ◽  
Static Tests ◽  
Wire Suspension ◽  
Suspension Structure ◽  
Sinusoidal Excitation

A novel viscoelastic model of four-wire suspension structure with damping gel in an optical pickup actuator was identified and validated. A two-stage method was developed for the identification of inertia, damping, and spring parameters in the dynamic model. The inertia and spring parameters were identified from static tests. With the identified parameters in the dynamic model, the damping parameters were identified through sinusoidal excitation tests. The accuracy of utilizing fractional derivative to model the damping of polymer damper was validated by carrying out error analysis. The fractional transfer function with voltage input was identified and compared with the transfer function of classical model.

scholarly journals Influence of additives on suspension structure

2021 ◽  
Vol 10 (1) ◽  
pp. 37-40
Author(s):  
Vesna Savić ◽  
Milica Martinović ◽  
Ivana Nešić ◽  
Jelena Živković ◽  
Ivana Gajić
Keyword(s):  
Zinc Oxide ◽  
The Other ◽  
Stability Tests ◽  
Polysorbate 20 ◽  
The Stability ◽  
Carbomer Gel ◽  
Suspension Structure ◽  
Insight Into ◽  
Study Offer ◽  
Measured Hardness

The aim of this study was to compare the stability and texture of three zinc oxide suspensions with different additives. Suspension 1 was made as official magistral formulation Suspensio album 7.5% from Formulae magistrales 2008. Suspension 2 was prepared when 1% carbomer gel was added to suspension 1 and suspension 3 was prepared when polysorbate 20 was added to suspension 2. After stability tests, texture analysis was performed on all suspensions. Following parameters were measured: hardness cycle 1, hardness cycle 2, cohesiveness, adhesiveness, resilience and springiness. The study showed that suspension 3 had the lowest value of hardness, and therefore the best spreadability. Also, suspension 3 was the least sticky of all three, since it was characterized with the lowest adhesiveness. Further, suspension 3 was the most cohesive and is predicted to withstand the stress during packing and use longer than others. On the other hand, the highest values of resilience and springiness were detected for suspension 1, while the lowest was related to suspension 2. Therefore, the best textural characteristics were assigned to suspension 3. This result is in accordance with the results of performed stability tests. The results of our study offer insight into potential improvements of the current magistral formulation Suspensio album 7.5%.

A new suspension structure of micro/nano probe

2015 ◽  
Author(s):  
Yong Li ◽  
Shuai Wang ◽  
ZhaoRui Chu ◽  
Jie Tang ◽  
Yang Xu ◽  
...  
Keyword(s):  
Suspension Structure

Dormant propagule banks of aquatic invertebrates in ponds invaded by exotic pine species in southern Brazil

2017 ◽  
Vol 68 (5) ◽  
pp. 954 ◽  
Author(s):  
Cristina Stenert ◽  
Bruna Ehlert ◽  
Arthur Cardoso Ávila ◽  
Francisco Diogo Rocha Sousa ◽  
Fernanda Mara Esquinatti ◽  
...  
Keyword(s):  
Species Composition ◽  
Aquatic Invertebrates ◽  
Species Turnover ◽  
Survival Rates ◽  
Southern Brazil ◽  
Aquatic Communities ◽  
Β Diversity ◽  
Pine Invasion ◽  
Dry Sediments ◽  
Pine Species

Exotic pine invasion affects native wetland communities in the Southern Hemisphere by changing the hydrological regimen and physicochemical characteristics. Studies evaluating the emergence of aquatic invertebrates from dormant stages are vital to identify the resilience of aquatic communities in ponds invaded by exotic pine species. In the present study, we tested the hypotheses that: (1) pine invasion decreases the richness of drought-resistant aquatic invertebrates in ponds; (2) pine invasion modifies the invertebrate composition in ponds; and (3) these differences in species composition (β diversity) are associated primarily with species turnover. Dry sediment samples were collected from three natural ponds in native grassland and three ponds in a pine invasion matrix in southern Brazil. In all, 7205 invertebrates, primarily represented by cladocerans (18 species), were sampled after rewetting dry sediments. Pine invasion decreased the richness of aquatic invertebrates because the natural ponds had almost 60% more species and a higher number of estimated species than the pine ponds. The composition differed between natural and pine ponds, and this difference in species composition (β diversity) was associated primarily with the replacement of some species by others. The presence of pine appears to alter colonisation and survival rates of aquatic invertebrates that aestivate in dry sediments in southern Brazil wetlands.

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