Evaluation of the strength characteristics of non-metallic elements of the air suspension of machines under the influence of negative temperatures and aggressive environments

2021 ◽  
pp. 3-6
Author(s):  
Keyword(s):  
Operating Conditions ◽  
Strength Characteristics ◽  
Pneumatic Cylinder ◽  
Metallic Elements ◽  
Road Vehicles ◽  
Air Suspension ◽  
Negative Temperatures ◽  
Rubber Part ◽  
Metallic Rubber ◽  
Deicing Agents

The operating conditions of non-metallic elements of the air suspension of road vehicles are analyzed. The influence of deicing agents and negative temperatures on non-metallic (rubber) elements of the pneumatic spring is studied. The methods of conducting tests to assess the effect of negative temperatures and aggressive environments on non-metallic elements of the air suspension are described. It is shown that the destruction of the microstructure is caused by the action of reagents on the rubber part of the pneumatic cylinder. Keywords: road vehicles, air suspension, rubber elements, negative temperatures, deicing agent

Resistance evaluation of nonmetallic elements of pneumatic suspension of machines to influence of negative temperatures

2021 ◽  
Vol 0 (3) ◽  
pp. 41-46
Author(s):  
I. G. Marenkov ◽  
◽  
N. I. Baurova ◽  
Keyword(s):  
Strength Characteristics ◽  
Resistance Evaluation ◽  
Operation Conditions ◽  
Negative Temperatures ◽  
Rubber Part ◽  
Pneumatic Suspension

The operation conditions of nonmetallic elements of the pneumatic suspension of road-making machines have been studied and analyzed. Evaluation of the strength characteristics of the nonmetallic elements of the pneumatic suspension under the influence of negative temperatures was carried out. It was found out by experiments that the influence of negative temperatures resulted in an increase in stiffness of a rubber part of an air cell. It was determined that for increasing resistance of the nonmetallic elements of the pneumatic suspension to the influence of negative temperatures it was necessary to use anaerobic impregnating compounds.

Change in strength characteristics of non-metallic components of air machine suspension under influence of negative temperatures

2020 ◽  
Vol 0 (10) ◽  
pp. 27-31
Author(s):  
I.G. Marenkov ◽  
◽  
N. I. Baurova ◽  
Keyword(s):  
Elastic Properties ◽  
Cold Season ◽  
Strength Characteristics ◽  
Air Spring ◽  
Term Operation ◽  
Air Suspension ◽  
Negative Temperatures

Operation features of non-metallic components of an air suspension of road-making machines have been examined. The main reasons of occurrence of the most widespread defects were analyzed. The strength characteristics of non-metallic components of the air machine suspension under the influence of negative temperatures were determined. It was found out that the rigid characteristics of nonmetallic components of an air spring bellow considerably increased under the influence of negative temperatures, and it resulted in degradation of the elastic properties and increasing the crack occurrence risk during the long-term operation of equipment in a cold season.

scholarly journals Design of a Thumb Strength Testing Device

2018 ◽  
Author(s):  
Christian Fry ◽  
James Mardula ◽  
Brandon Lee ◽  
Davide Piovesan
Keyword(s):  
Operating Conditions ◽  
Pneumatic Cylinder ◽  
Strength Testing ◽  
Testing Device ◽  
Flexor Pollicis Longus ◽  
Strength Data ◽  
Anterior Interosseous Nerve ◽  
Compact Design ◽  
Distal Section

The scope of the project was to design a pneumatic cylinder for measuring the resistive and applied force of the flexor pollicis longus (FPL) after anterior interosseous nerve (AIN) surgery. The patient’s distal section of the first phalange, of the thumb, is the area of evaluation. The device is intended for assessing both the quality of the surgery results as well as physical therapy progression. Criteria such as mobility, compact design, accuracy, repeatability, and ease of operation are some of the major requirements. The initial prototype is intended to collect FPL strength data to establish operating conditions.

The effect of negative temperatures on the bend strength characteristics of the polyethylene pipeline

2019 ◽  
Vol 19 ◽  
pp. 2347-2349
Author(s):  
Anatoly Serebrennikov ◽  
Daniil Serebrennikov ◽  
Igor Lavrov
Keyword(s):  
Strength Characteristics ◽  
Bend Strength ◽  
Negative Temperatures

On the vibration analysis of off-road vehicles: Influence of terrain deformation and irregularity

2018 ◽  
Vol 24 (22) ◽  
pp. 5418-5436 ◽  
Author(s):  
Giulio Reina ◽  
Antonio Leanza ◽  
Arcangelo Messina
Keyword(s):  
Performance Optimization ◽  
Operating Conditions ◽  
Vehicle Body ◽  
Surface Irregularity ◽  
Parameter Study ◽  
Road Vehicles ◽  
Wheel Rolling ◽  
And Performance ◽  
Underlying Mechanisms ◽  
The Impact

Surface irregularity acts as a major excitation source in off-road driving that induces vibration of the vehicle body through the tire assembly and the suspension system. When adding ground deformability, this excitation is modulated by the soil properties and operating conditions. The underlying mechanisms that govern ground behavior can be explained and modeled drawing on Terramechanics. Based on this theory, a comprehensive quarter-car model of off-road vehicle is presented that takes into account tire/soil interaction. The model can handle the general case of compliant wheel rolling on compliant ground and it allows ride and road holding performance to be evaluated in the time and frequency domain. An extensive set of simulation tests is included to assess the impact of various surface roughness and ground deformability through a parameter study, showing the potential of the proposed model to describe the behavior of off-road vehicles for design and performance optimization purposes.

Resistance determination of joints of plastic components, made by additive technologies, to effect of negative temperatures

2021 ◽  
Vol 0 (1) ◽  
pp. 23-27
Author(s):  
I. S. Nefyolov ◽  
◽  
N. I. Baurova ◽  
Keyword(s):  
Low Temperature ◽  
Room Temperature ◽  
Negative Influence ◽  
Strength Properties ◽  
Additive Technologies ◽  
Strength Characteristics ◽  
Hot Gas ◽  
Negative Temperatures ◽  
Plastic Components

The effect of negative temperatures on strength characteristics of plastic component joints (hot gas welding, gluing, 3D-welding) made with the use of additive technologies has been examined. It has been found out that 3D-wlding allows one to produce joints with the highest strength properties. It was shown that low temperature values (–30 °С) did not have the negative influence on strength properties of ABS-plastic joints but even increased them as compared with analogues samples tested at the room temperature.

Experimental Evaluation of Foil Bearing Performance: Steady-State and Dynamic Results

2009 ◽  
Author(s):  
M. J. Conlon ◽  
A. Dadouche ◽  
W. M. Dmochowski ◽  
R. Payette ◽  
J.-P. Be´dard ◽  
...  
Keyword(s):  
Steady State ◽  
High Speed ◽  
First Generation ◽  
Dynamic Properties ◽  
Operating Conditions ◽  
Pneumatic Cylinder ◽  
Test Procedures ◽  
Foil Bearings ◽  
Foil Bearing ◽  
Stepped Shaft

An experimental facility dedicated to measuring both the steady-state and dynamic properties of foil bearings, under a variety of operating conditions, has been designed and commissioned. The bearing under test is placed at the midspan of a horizontal, simply-supported, stepped shaft which rotates at up to 60 krpm. Static and dynamic loads of up to 3500 N and 450 N (respectively) can be applied by means of a pneumatic cylinder and two electrodynamic shakers. This paper outlines the test procedures and data analysis methods pertaining to the operation of the high-speed, oil-free bearing test rig, and presents steady-state and dynamic results for a first-generation foil bearing. The test bearing, which was fabricated in-house, is 0.07 m diameter and has an aspect ratio of 1; bearing manufacturing details are provided.

scholarly journals Using interpolation and correlation to evaluate the quality of cement composites exposed to a thermally aggressive environment

Vestnik MGSU ◽  
2021 ◽  
pp. 1473-1482
Author(s):  
Irina N. Maksimova ◽  
Irina V. Erofeeva ◽  
Victor V. Afonin ◽  
Denis V. Emelyanov
Keyword(s):  
Quality Evaluation ◽  
Rank Correlation ◽  
Operating Conditions ◽  
Atmospheric Environment ◽  
Coefficient Of Determination ◽  
Cement Composites ◽  
Spearman’S Rank Correlation ◽  
Negative Temperatures ◽  
Cyclic Changes

Introduction. The article addresses the quality evaluation of cement composites after their exposure to the atmospheric environment that features a rapid change in positive and negative temperatures. The article has a numerical assessment of the quality of cement composites. The quality assessment method encompasses the Spearman’s rank correlation, the coefficient of determination, and the adjustment ratio. Materials and methods. Testable cement composites are the compositions numbered from one to eight. They differ in the concentration of various additives, including superplasticizers and aggregates. Testable compositions were exposed to cyclic changes in positive and negative temperatures, and four of their properties were checked in the points of control on Day 0, Day 15, and Day 45. Linear interpolation was used to expand the data array. Changes in the properties of composites were compared with the benchmark values; the Spearman’s rank correlation and the coefficient of determination were calculated. Moreover, arrays of interpolated values were reduced to relative units to calculate the adjustment ratios. Entry values were employed to develop the evaluation metrics and assess the quality of cement composites. Results. The proposed numerical metrics is used to rank the testable samples and identify the best compositions. Library functions and transformations, available in the MATLAB system, are applied to each action, which can be implemented in nearly any software programming language. Conclusions. The proposed method of heuristic quality evaluation of cement composites may be applied to the cases when testable samples are exposed to versatile adverse and aggressive operating conditions.

A New Type Adjustable Shock Absorber and its Characteristic Model

2010 ◽  
Vol 97-101 ◽  
pp. 3423-3427
Author(s):  
Jun Xiu Hu ◽  
Hao Bin Jiang ◽  
Chen Long ◽  
Tao Wang
Keyword(s):  
Shock Absorber ◽  
Structural Parameters ◽  
Hydrodynamic Theory ◽  
Pneumatic Cylinder ◽  
Bench Test ◽  
Damping Force ◽  
Characteristic Model ◽  
Air Suspension ◽  
Beam Method ◽  
New Type

A new type adjustable hydraulic shock absorber for a bus air suspension is designed, the solenoid valve and swing pneumatic cylinder are adopted as driving device for changing damping states. The structure and work principle of the shock absorber is introduced. By applying hydrodynamic theory, a mathematical model of shock absorber’s damping characteristic is built. Several typical algorithms for calculating damping valve plate’s deflection are analyzed. Conjugate Beam Method, an approximate method with relatively less calculation work, is chosen to calculate the deflection of valve plates. Main structural parameters’ affecting on shock absorber’s damping performance are simulated, the shock absorber specimen is manufactured. The bench test results of specimen show, “hard” and “soft” damping states switch reliably, damping force deviations between test and simulation results are less than 4%. It is verified the established model for adjustable shock absorber is correct, the Conjugate Beam Method for calculating valve plates’ deflection is effective.

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