mechanical structure
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Machines ◽  
2022 ◽  
Vol 10 (1) ◽  
pp. 33
Author(s):  
Lingfeng Sang ◽  
Hongbo Wang ◽  
Yu Tian

Patient transfer has always been a difficult problem in the hospital. For medical staff, there are problems including high risk of infection, heavy physical labor and low efficiency of transfer; for patients, there are problems including poor comfort and secondary injury. In this paper, a novel bilateral patient transfer robot is investigated and designed. The following tasks are conducted: (1) Based on the process of patient transfer, a transfer model, which consists of two degrees of freedom, is proposed, and the working principle of bilateral patient transfer robot is obtained and analyzed in detail. (2) Force analysis of the patient transfer robot is conducted. The corresponding relationship between the patient comfort and the insertion angle is proposed, and the optimal sizes of mechanical structure are obtained. (3) Based on the theoretical analysis, the mechanical structure and the control system of the robot are designed, and the prototype is manufactured. (4) Experimental research is conducted. The results show that the prototype can complete the required motion performance with a carrying capacity up to 150 kg and patient comfort is excellent. The results of this paper prove that this kind of patient transfer robot has good performance, it can also reduce the burden on medical staff.


2022 ◽  
Vol 355 ◽  
pp. 03072
Author(s):  
Beilei Wang

Mechanical errors seriously affect the transmission performance of mechanical structure, especially for high-precision mechanical structure. With the development of virtual simulation technology, the performance test of mechanical structure in virtual environment is gradually applied. Under the background, this paper takes the movable tooth reducer as the research object and puts forward a virtual performance test method by combing test errors with virtual simulation technology. The tooth profile errors of key components of the reducer are obtained by optical scanning, and the simulation test is carried out. Meanwhile, the accuracy of the simulation test is verified by the implementation of vibration test. The results show that both the simulated vibration acceleration and the experimental test vibration acceleration show a double-peak variation trend, and the frequency difference between the two peaks is less than 5%. Therefore, the simulation test method proposed in this paper can effectively evaluate the performance of mechanical structures.


Author(s):  
Christopher James Brown ◽  
Thomas Simon ◽  
Chiara Cilibrasi ◽  
Peter Lynch ◽  
Rhiannon W Harries ◽  
...  

Three-dimensional tissue scaffolds have utilised nanomaterials to great effect over the last decade. In particular, scaffold design has evolved to consider mechanical structure, morphology, chemistry, electrical properties, and of course...


2021 ◽  
Vol 16 ◽  
Author(s):  
Baocheng Xie ◽  
Shun Liu ◽  
Huaqiang Gao ◽  
Tingliang Zhang

Background: 3D printing technology is widely applied in transportation, industrial equipment, medical, aerospace, and civil industry due to its characteristics of material saving, no model manufacturing, and machinability of complex parts. The mechanical structure of 3D printer mainly includes 3D printer head structure and working platform and plays a major role in the machining efficiency and processing accuracy of the 3D printer. Thus, increasingly attention has been paid to the current trends of the mechanical structure of 3D printers. Objective: To meet the increasing requirements of 3D printing processing efficiency and precision, the mechanical structure of 3D printers, such as 3D print head structure and working platform, needs to be carefully studied, and a feasible mechanical structure of 3D printers should be proposed. Methods: This paper studies various representative patent related to the mechanical structure of 3D printer, analyzes the mechanical structure of 3D printer, and studies the perfect mechanical structure of 3D printer. Results: Through summarizing a lot of patents about the mechanical structure of 3D printers, the main current existing problems such as platform jitter and machining error are summarized and analyzed, a new mechanical structure of 3D printers is proposed. Moreover, the development tendency of the mechanical structure of 3D printers in the future is discussed. Conclusion: The optimization of the mechanical structure of 3D printer is conducive to increasing the machining efficiency and processing accuracy in the 3D printing process. More relevant patents about working platform and 3D printer head will be invented in the future


2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Chenguang Li ◽  
Dimah Alahmadi ◽  
Mohammed Yousuf Abo Keir

Abstract In order to promote the development of sports training robots and improve the training of lower limbs in Sanda, a new mechanical structure of Sanda training robots is designed. The thesis combines the mathematical method of fractional differential equations to design a new type of omnidirectional moving platform mechanism, which realises the movement in any direction in the plane and can turn at any radius during the movement. From the perspective of kinematics, the mathematical relationship between wheel speed and robot trajectory is analysed, and a virtual prototype technology combined with Pro/E and Adams joint modelling and simulation method is used to establish an accurate and reliable virtual prototype model. The experimental simulation results show that the designed virtual prototype model is consistent with the mathematical model, which verifies the practical feasibility of the mechanical structure of the lower limb power generation robot for Sanda movement, and provides a reliable basis for the establishment of the physical prototype.


2021 ◽  
Author(s):  
◽  
Harold V. Clark

The world today has special concern with morality not that its people are less moral, but rather that two agencies in particular have acted to bring about conditions in which a high standard of morality is difficult to attain. First, the industrial conditions of the Great Society produced the Nation, which, according to Rabindranath Tagore, is an organisation of power breaking the living bonds society, giving place to a mechanical structure, so that the full reality of man is more and more crushed beneath its weight. Secondly the disintegrating influence of Democracy, accelerated by the situation which arose from the World War, has produced a renewed disposition to scrutinise opinion about all sanctions of conduct, whether legal, moral or religious, so that "what is sometimes called 'authority' does not count for what it did. Questions are being raised with freedom that is fresh, about the formulas which express the various kinds of faith."


2021 ◽  
Author(s):  
◽  
Harold V. Clark

The world today has special concern with morality not that its people are less moral, but rather that two agencies in particular have acted to bring about conditions in which a high standard of morality is difficult to attain. First, the industrial conditions of the Great Society produced the Nation, which, according to Rabindranath Tagore, is an organisation of power breaking the living bonds society, giving place to a mechanical structure, so that the full reality of man is more and more crushed beneath its weight. Secondly the disintegrating influence of Democracy, accelerated by the situation which arose from the World War, has produced a renewed disposition to scrutinise opinion about all sanctions of conduct, whether legal, moral or religious, so that "what is sometimes called 'authority' does not count for what it did. Questions are being raised with freedom that is fresh, about the formulas which express the various kinds of faith."


2021 ◽  
pp. 1-20
Author(s):  
Jarl Beckers ◽  
Björn Verrelst ◽  
Francesco Contino ◽  
Joeri Van Mierlo

Abstract Conventional implementation of slider-crank mechanisms result in high loads transmitted through the mechanical structure, inhibiting the design of compact and oil-free machines. Therefore, this research proposes to step away from the conventional, i.e. rotative, actuation and to investigate local linear actuation on the slider-component directly, while maintaining the kinematic link of the slider-crank configuration. In this work the local linear actuating principle is evaluated experimentally where the goal is to obtain a continuous movement of the slider mechanism where Top Dead Centre & Bottom Dead Centre are reached and to minimise the loads transmitted through the mechanical structure. The non-isochronous transient behaviour of a slider-crank mechanism loaded with a spring-damper element is detailed as well as the optimal working conditions at steady state to achieve a reduced loading of the kinematic structure. By matching the operating frequency and resonance frequency of the system, a reduction of the loads transmitted through the system by 63% of the nominal spring load can be achieved. Further experimental (and multibody mechanical) investigation on the influence of flywheel exposes a clear trade-off between the sensitivity of the system and the transmission of the actuation force through the kinematic link.


Structures ◽  
2021 ◽  
Vol 34 ◽  
pp. 3247-3256
Author(s):  
Debiao Meng ◽  
Zhiyuan Lv ◽  
Shiyuan Yang ◽  
Hongtao Wang ◽  
Tianwen Xie ◽  
...  

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