Displacement between seating surface and test dummy during transitions with a variable configuration wheelchair

2003 ◽  
Author(s):  
M.J. Dvorznak ◽  
R.A. Cooper ◽  
A.J. Rentschler ◽  
M.L. Boninger ◽  
S.G. Fitzgerald
Keyword(s):  
Variable Configuration ◽  
Seating Surface

Terrain Adaptive Vehicles

1995 ◽  
Vol 117 (B) ◽  
pp. 107-112 ◽  
Author(s):  
K. J. Waldron
Keyword(s):  
Reference List ◽  
Central Feature ◽  
Coordination Problem ◽  
Technical Problems ◽  
Vehicle Type ◽  
Variable Configuration ◽  
And Control ◽  
Wheeled Vehicles ◽  
Coordination And Control ◽  
Principal Elements

Research on walking vehicles and variable configuration wheeled vehicles is reviewed. The central feature of the vehicles discussed is terrain adaptive capability. The principal elements of the technical problems of coordination and control are discussed for each vehicle type. Examples of each vehicle type are discussed and an extensive reference list is provided. Although the article is primarily a review article, it contains a new discussion of the coordination problem of robotic mechanisms.

Dynamics of a System of Bodies with Program-Variable Configuration

2004 ◽  
Vol 40 (3) ◽  
pp. 345-350 ◽  
Author(s):  
A. E. Zakrzhevskii ◽  
J. Matarazzo ◽  
V. S. Khoroshilov
Keyword(s):  
Program Variable ◽  
Variable Configuration

Method of Predicting Differential Case Bolt Behavior

2015 ◽  
Author(s):  
Takanori Nukata ◽  
Yasuo Arai ◽  
Mitsunori Kamimura ◽  
Taketoshi Kido ◽  
Masahiko Yamazaki
Keyword(s):  
Contact Surface ◽  
Design Method ◽  
Maximum Load ◽  
Design Guidelines ◽  
Ring Gear ◽  
Bearing Surface ◽  
Surface Pressure Distribution ◽  
Screw Surface ◽  
Bolt Loosening ◽  
Seating Surface

This paper proposes a CAE-based method to predict the maximum load at which bolts start to loosen. The qualitative validity of this method was confirmed using the fastening bolts between the differential case and ring gear. In general, the differential case and ring gear are fastened with bolts. Therefore, it is essential to estimate the maximum load of bolt loosening when designing these bolts. Moreover, prototypes found that tightening bolts are more likely to loosen as the thickness of the differential case or ring gear decreases and becomes easier to deform. This indicates that the deformation of the differential case and ring gear must be considered in bolt design. However, predicting the maximum load is relatively difficult because the behavior of both the screw and the contact surface between the differential case and ring gear is complicated. In contrast, recent transmissions require further weight reduction without sacrificing reliability. Consequently, a method of predicting the maximum load of bolt loosening is required. First, this paper describes a CAE model for estimating the pressure and friction generated at the contact surface between the differential case and ring gear, as well as at the screw surface and bolt seating surface. Furthermore, a method for determining bolt loosening is described that incorporates the pressure and friction on the bolt seating surface into friction circle theory. This method was used to derive the maximum load of bolt loosening. In addition, it was also confirmed that the results qualitatively agree with actual cases of bolt loosening. Second, this paper identifies the relative sliding of the screw surface and contact surface when the load increases. In this case, it was verified that the sliding on the contact surface between the differential case and ring gear induces relative sliding of the screw, followed by sliding of the bolt bearing surface and loosening of the bolt. Finally, this paper refers to design guidelines for reducing the weight of the differential case using an experimental design method. Certain ribs cause non-uniform bolt bearing surface pressure distribution, which likely affects bolt loosening. Through this research, the validity of the method was confirmed and the bolt behavior was clarified when a differential case and ring gear are loaded in one direction. Based on these results, it should be possible to apply this method to more complicated load cases in the future.

scholarly journals Analytical Study of Front-End Circuits Coupled to Silicon Photomultipliers for Timing Performance Estimation under the Influence of Parasitic Components

Sensors ◽  
2020 ◽  
Vol 20 (16) ◽  
pp. 4428
Author(s):  
Pietro Antonio Paolo Calò ◽  
Savino Petrignani ◽  
Michele Di Gioia ◽  
Cristoforo Marzocca
Keyword(s):  
Single Photon ◽  
Performance Estimation ◽  
Laser Source ◽  
Detector Response ◽  
Silicon Photomultipliers ◽  
Parasitic Inductance ◽  
Front End ◽  
Single Photon Response ◽  
Variable Configuration ◽  
Definition Of

Full exploitation of the intrinsic fast timing capabilities of analog silicon photomultipliers (SiPMs) requires suitable front-end electronics. Even a parasitic inductance of a few nH, associated to the interconnections between the SiPM and the preamplifier, can significantly degrade the steepness of the detector response, thus compromising the timing accuracy. In this work, we propose a simple analytic expression for the single-photon response of a SiPM coupled to the front-end electronics, as a function of the main parameters of the detector and the preamplifier, taking into account the parasitic inductance. The model is useful to evaluate the influence of each parameter of the system on the slope of its response and to guide the designer in the definition of the architecture and the specifications for the front-end electronics. The results provided by the model have been successfully compared with experimental measurements from a front-end circuit with variable configuration based on a bipolar junction transistor (BJT), coupled to a 3 × 3 mm2 SiPM stimulated by a fast-pulsed laser source.

Evalution of a mobile exercise assist device focusing on the seating surface

2019 ◽  
Vol 2019 (0) ◽  
pp. S15108P
Author(s):  
Ryo Kobayashi ◽  
Kazuto Miyawaki ◽  
Ayuko saito ◽  
Yoshikazu Kobayashi ◽  
Satoru Kizawa
Keyword(s):  
Assist Device ◽  
Seating Surface

Switching Dynamics of Bistable Fluidic Amplifiers With Low Setbacks

1972 ◽  
Vol 94 (1) ◽  
pp. 21-29
Author(s):  
M. R. Ozgu ◽  
A. H. Stenning
Keyword(s):  
Reynolds Numbers ◽  
Convex Side ◽  
Switching Times ◽  
Variable Control ◽  
Switching Dynamics ◽  
Hydrogen Bubbles ◽  
Side Walls ◽  
Variable Configuration ◽  
Control Port ◽  
Geometric Changes

The transient switching of a model bistable fluidic amplifier with low setbacks and variable configuration has been studied. The amplifier was of conventional design with straight and convex side-walls, cusped and pointed splitters, and variable control port width. Water was used as the fluid and the element was operated at different Reynolds numbers. Effect of loading, inertia of the fluid in the output legs, bias flows from the inactive control port, and geometric changes on the transient switching times were determined. The flow field was made visible by generating hydrogen bubbles in the power nozzle and at the power nozzle exit. Using visual studies of the switching process as a guide, an analysis has been developed to predict the switching times approximately.

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