Road vehicles. Safety enhancement in conjunction with tyre inflation pressure monitoring

AbstractObjectives:Following a suggestion by ward patients that Rapid Rhino™ nasal packs may deflate over time, allowing recurrence of epistaxis, we aimed to demonstrate deflation of 7.5 cm Rapid Rhino packs when used in vivo for post-operative nasal packing.Materials and methods:The volume of air insufflated and retrieved from Rapid Rhino nasal packs used for post-operative nasal packing was recorded, as was the pressure following inflation and prior to removal. The time taken for the initial inflation pressure to stabilise was monitored in a number of packs. Similar pressure and volume measurements were repeated in a series of in vitro packs for comparison.Results:Fourteen consecutive patients undergoing septoplasty were recruited. High but unsteady pressure values were obtained in the first patient's packs. In the subsequent five patients, continuous pressure monitoring demonstrated that gradual depressurisation occurred over the first 16 to 22 minutes following inflation. A typical pressure was 35 cmH2O after inflating with 8 ml of air. Only one Rapid Rhino pack was demonstrated to leak air in vivo.Conclusion:When used in vivo, Rapid Rhino nasal packs initially depressurise over a period of about 20 minutes. Actual leakage (deflation) was not demonstrated to be an expected feature of Rapid Rhino packs in this study.

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Off-Road Vehicles’ Traction Performance Augmented by Controlling Tire Inflation Pressure

10.4271/2021-01-0327 ◽

2021 ◽

Author(s):

Alhossein Mostafa Sharaf ◽

Mohamed Nassar

Keyword(s):

Inflation Pressure ◽

Road Vehicles

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Influence of soil and tire parameters on traction

Research in Agricultural Engineering ◽

10.17221/3105-rae ◽

2008 ◽

Vol 54 (No. 2) ◽

pp. 43-49 ◽

Cited By ~ 15

Author(s):

M. Schreiber ◽

H.D. Kutzbach

Keyword(s):

Soil Cover ◽

Engine Performance ◽

Rolling Resistance ◽

Clay Content ◽

Soil Strength ◽

Soil Parameters ◽

Empirical Equations ◽

Inflation Pressure ◽

Road Vehicles ◽

Drawbar Pull

The drawbar pull, travel reduction (slip), and rolling resistance are the main criteria to describe the traction behaviour of off road vehicles. Besides the engine performance, the drawbar pull is influenced by the traction conditions such as soil and the tire parameters. These traction conditions have to be described by a limited number of parameters which can be easily determined. Empirical equations were used to analyse roughly 850 traction curves measured and published by Steinkampf. As a result, the important parameters to describe the traction conditions are three tire parameters (radius, width, inflation pressure) and five soil parameters (soil cover, upper soil strength, lower soil strength, clay content, moisture content). These parameters with relative values between 0 and 100% are used to establish the equations for the traction prediction. Main steps to achieve this goal are the extension of the traction slip equation by a linear term of slip, and the description of this curve by 4 meaningful characteristic coefficients: the x- and y-coordinates of the κ-maximum (σ κmax, κmax), the y-axis intercept ρe, and the gradient of κ at zero slip (κ’(0)).

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Automatic Adaptation of Tire Pressure According to Operating Conditions

International Journal of Vehicle Structures and Systems ◽

10.4273/ijvss.8.2.10 ◽

2016 ◽

Vol 8 (2) ◽

Author(s):

A. Hendy ◽

Shawky Hegazy ◽

M.A.A. Emam ◽

H. Hossamel-din

Keyword(s):

Continuous Monitoring ◽

Rolling Resistance ◽

Considerable Effect ◽

Operating Conditions ◽

Inflation Pressure ◽

Road Vehicles ◽

Tire Pressure ◽

Wheel Slip ◽

Slip Ratio ◽

Automatic Adaptation

The off-road vehicles have much higher rolling resistance due to tire sinkage. This paper presents a proposed system for automatic adaptation for tire inflation/deflation, according to operating conditions. The tire inflation pressure is manually changed by the driver to some prefixed pressure values. The proposed control system is based on calculating the instantaneous wheel slip ratio. As the slip ratio increases, the tire pressure decreases automatically to increase the contact area and to decrease the dynamic sinkage and vice versa. An algorithm for the control strategy is developed. The proposed system provides a continuous monitoring of tire pressures inside the tire and then to inflate/deflate according to terrain types. The results show that a low inflation pressure has a considerable effect on the net traction ratio where it improves the performance by 20% and the buffed tire has a better traction than lugged tire on sand.

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Environmental Impacts of Road Vehicles

10.1039/9781788010221 ◽

2017 ◽

Cited By ~ 1

Keyword(s):

Environmental Impacts ◽

Road Vehicles

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Abstract #414 Ambulatory Blood Pressure Monitoring and Correlation with Cardiovascular Risk Markers in Type 2 Diabetes In Association with The Prevalence of Non-Dippers

Endocrine Practice ◽

10.1016/s1530-891x(20)47175-7 ◽

2018 ◽

Vol 24 ◽

pp. 103

Author(s):

Rohit Kapoor ◽

Shivam Kapoor ◽

Rishabh Kapoor

Keyword(s):

Blood Pressure ◽

Type 2 Diabetes ◽

Cardiovascular Risk ◽

Ambulatory Blood Pressure Monitoring ◽

Ambulatory Blood Pressure ◽

Blood Pressure Monitoring ◽

Risk Markers ◽

Pressure Monitoring

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Performance study of RTV-2 Silicone Rubber Material For Soft Actuator by Experimental and Numerical methods: The Effect of Inflation Pressure and Wall Thickness

International Journal of Automotive and Mechanical Engineering ◽

10.15282/ijame.17.1.2020.01.0556 ◽

2020 ◽

Vol 17 (1) ◽

pp. 7524-7532 ◽

Cited By ~ 1

Author(s):

Deepak D. ◽

Nitesh Kumar ◽

Shreyas P. Shetty ◽

Saurabh Jain ◽

Manoj Bhat

Keyword(s):

Numerical Methods ◽

Wall Thickness ◽

Silicone Rubber ◽

Inflation Pressure ◽

Performance Study ◽

Rubber Material ◽

Soft Actuator ◽

Alternative Materials ◽

Load Carrying ◽

Influential Parameters

The expensive nature of currently used materials in the soft robotic industry demands the consideration of alternative materials for fabrication. This work investigates the performance of RTV-2 grade silicone rubber for fabrication of a soft actuator. Initially, a cylindrical actuator is fabricated using this material and its performance is experimentally assessed for different pressures. Further, parametric variations of the effect of wall thickness and inflation pressure are studied by numerical methods. Results show that, both wall thickness and inflation pressure are influential parameters which affect the elongation behaviour of the actuator. Thin (1.5 mm) sectioned actuators produced 76.97% more elongation compared to thick sectioned, but the stress induced is 89.61 % higher. Whereas, the thick sectioned actuator (6 mm) showed a higher load transmitting capability. With change in wall thickness from 1.5 mm to 6 mm, the elongation is reduced by 76.97 %, 38.35 %, 21.05 % and 11.43 % at pressure 100 kPa, 75 kPa, 50 kPa and 25 kPa respectively. The induced stress is also found reduced by 89.61 %, 86.66 %, 84.46 % and 68.68 % at these pressures. The average load carrying capacity of the actuator is found to be directly proportional to its wall thickness and inflation pressure.

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