mechanical systems
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2022 ◽  
Vol 167 ◽  
pp. 108536
Shaobo Shen ◽  
Aiguo Song ◽  
Huijun Li ◽  
Tao Li

2022 ◽  
Tobias Kippenberg ◽  
Amir Youssefi ◽  
Andrea Bancora ◽  
Shingo Kono ◽  
Mahdi Chegnizadeh ◽  

Abstract Cavity optomechanics enables controlling mechanical motion via radiation pressure interaction [1–3], and has contributed to the quantum control of engineered mechanical systems ranging from kg scale LIGO mirrors to nano-mechanical systems, enabling entanglement [4, 5], squeezing of mechanical objects [6], to position measurements at the standard quantum limit [7], non-reciprocal [8] and quantum transduction [9]. Yet, nearly all prior schemes have employed single- or few-mode optomechanical systems. In contrast, novel dynamics and applications are expected when utilizing optomechanical arrays and lattices [10], which enable to synthesize non-trivial band structures, and have been actively studied in the field of circuit QED [11–14]. Superconducting microwave optomechanical circuits are a promising platform to implement such lattices [15], but have been compounded by strict scaling limitations. Here we overcome this challenge and realize superconducting circuit optomechanical lattices. We demonstrate non-trivial topological microwave modes in 1-D optomechanical chains as well as 2-D honeycomb lattices, realizing the canonical SuSchrieffer-Heeger (SSH) model [16–18]. Exploiting the embedded optomechanical interaction, we show that it is possible to directly measure the mode functions of the bulk band modes, as well as the topologically protected edge states, without using any local probe [19–21] or inducing perturbation [22, 23]. This enables us to reconstruct the full underlying lattice Hamiltonian beyond tight-binding approximations, and directly measure the existing residual disorder. The latter is found to be sufficiently small to observe fully hybridized topological edge modes. Such optomechanical lattices, accompanied by the measurement techniques introduced, of-fers an avenue to explore out of equilibrium physics in optomechanical lattices such as quan-tum [24] and quench [25] dynamics, topological properties [10, 26, 27] and more broadly, emergent nonlinear dynamics in complex optomechanical systems with a large number of degrees of freedoms [28–31].

2022 ◽  
Vol 2022 ◽  
pp. 1-14
Peng Gao ◽  
Liyang Xie

Generalized reliability models and failure rate models of mechanical systems are developed in this paper according to the system working mechanism, which take the design parameters as input. The models consider strength degradation and imperfect maintenance. Besides, the models take into account the failure correlation caused by homologous load effect and the maintenance correlation owing to group maintenance. Unlike traditional reliability models, the models do not rely on empirical assumptions when considering failure correlation and maintenance correlation and have clear physical meaning. Moreover, the correctness and effectiveness of the models are verified by Monte Carlo simulations. Finally, the influences of failure correlation and maintenance correlation on generalized reliability, the influences of failure correlation on maintenance correlation, and the influences of maintenance correlation on failure correlation are analyzed via numerical examples. The results show that failure correlation and maintenance correlation have great influences on generalized reliability, and the interaction between the two correlation shows obvious time-varying characteristics.

2022 ◽  
Vol 5 ◽  
pp. 82-91
Jackson Stuhler

Com o avanço da tecnologia os processos de fabricação de microcomponentes dentro de um circuito integrado (CIs) permitiram a construção de micro estruturas mecânicos como sensores e atuadores comumente chamadas de MEMS (electro-mechanical systems – sistemas eletromecânicos) com tamanho na ordem de 0,001 mm e podendo ser compostos de diversos materiais como silicone, cerâmica, polímeros e metais estes sensores estão revolucionando o mercado com diversas aplicações na área de entretenimento, indústria, medicina, automobilístico e aeroespacial dentre outros, que anteriormente era muito limitado devido ao custo e tamanho dos dispositivos. Dentre esses dispositivos serão abordado os sensores de Unidade de Medição Inercial (IMU) com foco no sensoriamento para unidades de automação e robótica.

2022 ◽  
Vol 13 ◽  
pp. 54-62
Huang-Hsiang Lin ◽  
Jonathan Heinze ◽  
Alexander Croy ◽  
Rafael Gutiérrez ◽  
Gianaurelio Cuniberti

Lubricants are widely used in macroscopic mechanical systems to reduce friction and wear. However, on the microscopic scale, it is not clear to what extent lubricants are beneficial. Therefore, in this study, we consider two diamond solid-state gears at the nanoscale immersed in different lubricant molecules and perform classical MD simulations to investigate the rotational transmission of motion. We find that lubricants can help to synchronize the rotational transmission between gears regardless of the molecular species and the center-of-mass distance. Moreover, the influence of the angular velocity of the driving gear is investigated and shown to be related to the bond formation process between gears.

Actuators ◽  
2022 ◽  
Vol 11 (1) ◽  
pp. 11
Sayako Sakama ◽  
Yutaka Tanaka ◽  
Akiya Kamimura

Until the 1970s, hydraulic actuators were widely used in many mechanical systems; however, recently, electric motors have become mainstream by virtue of their improved performance, and hydraulic motors have largely been replaced by electric motors in many applications. Although this trend is expected to continue into the future, it is important to comprehensively evaluate which motor is most suitable when designing mechanical systems. This paper presents the results of a survey of the performance of electric and hydraulic servo motors and aims to provide quantitative data that can be used as a reference for selecting appropriate motors. We surveyed AC, AC direct, brushless DC, and brushed DC electric motors and swash plate-type axial piston, bent axis-type axial piston, crank-type radial piston, and multistroke-type radial piston hydraulic motors. Performance data were collected from catalogs and nonpublic data. We compared and evaluated the characteristics of these diverse servo motors using indexes such as torque, rotating speed, output power, power density, and power rate.

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