Universal Wheel Research Articles

The Design of Electric Fire Engine

The electric fire engine is based on the single chip microcomputer as the control core. In order to better realize the fire extinguishing function, the latest electric fire engine has added the tracking module, wireless transceiver module, etc., to realize the intelligent fire engine to detect the fire source and extinguish the flame. This design combines the principle of single chip microcomputer with the hardware and software circuit program to realize the function of automatic tracking and fire extinguishing, without the fire personnel risking their lives to carry out on-site operation. This kind of electric intelligent fire truck adds some practical small functions, brings us a lot of convenience, can better serve human beings. The main model of this design is a small toy car model with universal wheel and motor control wheel. The chassis is installed with a variety of sensors with different functions to achieve the purpose of moving forward and backward, steering and avoiding obstacles and eventually extinguishing the fire source. At the same time, the car can also realize wireless remote control. By comparing the shortcomings of the traditional fire truck, some improvements are made, the circuit diagram of intelligent control is designed, and the method of wireless control car for fire fighting is explored with the combination of practice and thinking, so as to further improve the fire truck and make it intelligent. The main purpose of this design is to reduce the fire casualties and improve the need for fire personnel to take the risk of life operation of the traditional fire truck function. Its advantages are automatic tracking, avoidance of obstacles, wireless control, measuring the source of fire.

Development and Application of An Intelligent Shock-absorbing Sitting Walker

To design a sitting walking aid with intelligent shock absorption, high safety, alarm and heart rate monitoring device. Aluminum alloy bracket is used as the main body of the walker. U-shaped soft arm bracket and L-shaped handle are arranged at the top, and universal wheel and anti-slip floor mat are arranged at the bottom. The shock-absorbing seat is connected to the geared motor through a hydraulic rod, and the seat is equipped with GPS, alarm device and heart rate monitoring device, and the finite element software Abaqus 2021 is used to analyze the force of the shock absorbing seat. The main body of the walker is light and easy to carry, with strong bearing capacity. The U-shaped soft arm rest and L-shaped handle can increase the sense of user experience. The combination of universal wheel and anti-slip floor mat can make the user safe and labor-saving. When the user wants to sit down and rest, the switch can be adjusted to drive the shock absorbing seat to turn over and support the elderly to sit down slowly through the deceleration motor, so as to realize the safe and independent rest, and the shock absorbing seat can withstand the corresponding stress. The intelligent shock-absorbing sitting and standing walker saves manpower, is safe and reliable, and meets market demand and user needs.

Design of Intelligent Car Control Based on EEG Signal

Based on the TGAM (ThinkGear Asic Module) EEG sensor, this paper mainly carried out the research and design of intelligent car control method. By collecting brainwave and analyzing TGAM output data, the required concentration parameters can be obtained. STM32F1 series MCU is used as the main controller to analyze data and control the car. The bluetooth module based on Bluetooth 4.0 technology is used to realize data communication. The power system includes L298N motor drive module, two independent DC motor and universal wheel. The software part mainly uses C language for development, the core part of the program is ThinkGear communication protocol analysis. Finally, the design realizes the control of the vehicle motion state through different values of concentration, which lays a foundation for further popularization and application.

Research on Detection Technology of Joint Sealing of Large Diameter PVC Water Supply Pipe

With the increasing application of PVC water supply pipe in production and life, this paper aims at the problem that there is no single sealing ring connected large diameter PVC pipe interface sealing detection equipment in the construction site of agricultural water supply. According to the sealing test method of negative pressure test, a set of large diameter PVC pipe interface sealing test device is designed, and the corresponding test procedures and standards are put forward. The field sealing test of large diameter PVC pipe interface is carried out, and the portable aviation aluminum box with universal wheel is designed and customized. The device has the advantages of simple structure, easy installation and disassembly, easy carrying, and is suitable for field operation. It provides important equipment support for the better promotion and use of large PVC pipes.

Design and application of multifunctional physical model test device for movement and accumulation process of rapid long-runout landslide

There are many factors affecting the movement and accumulation process of rapid long-runout landslide. During the developing the physical model test device, it is necessary to meet the needs of multi-factors, so as to achieve multi-functional purposes. The device is 3.40 m long, 0.56 m wide and 1.35 m high in initial state (vertical angle=20° and horizontal angle=0°). The design includes three modules: volume adjustment of slide body, slope adjustment of upper slide groove and horizontal angle adjustment of horizontal slide groove. Two kinds of materials, 3 mm thick stainless steel plate and 8 mm thick tempered glass, are used as the processing raw materials, leading to good durability. Moreover, the universal wheel is installed in the form of component assembly to facilitate the handling of the experimental instrument. Based on sand and pebble granular materials, the physical model tests with respect to the movement and accumulation process of rapid long-runout landslide are preliminarily carried out by using the developed device. The effects of slope, horizontal angle, height of sliding body and base material on sliding distance are briefly analyzed.

Sensitivity analysis of parametric errors on the performance of a torsion quasi-zero-stiffness vibration isolator

A quasi-zero-stiffness (QZS) isolator can perform a good function of low-frequency vibration isolation, but its designed ultra-low dynamic stiffness could be notably affected by parametric errors, which usually occur in the manufacturing and assembling process. In this paper, the effects of design parameter errors on the performance of a torsion QZS vibration isolator are studied, and several useful guidelines for the manufacture and assembly of the QZS isolator are achieved. An approximate relationship between a single error and the jump-down frequency is obtained, and then the influence of a combination of multiple errors is investigated numerically. The results indicate that, as key parts of the QZS isolator, the universal wheel and cam should avoid positive manufacturing tolerances, while the shaft connector has to keep away from negative tolerance, and an assembly error of the disk spring stack should be mostly avoided as much as possible. Additionally, the degradations on the performance caused by single errors can be eliminated by a combination of multiple errors, due to a mutual counteraction of these influences. Most importantly, the QZS vibration isolation system still outperforms its linear counterpart, even though it has parametric errors.

Breaking the Cycle of Myth Hunting: A Methodological Dialogue with Archie Mafeje in a Review ofThe Theory and Ethnography of African Social Formations: The Case of the Interlacustrine Kingdoms

AbstractThe Theory and Ethnography of African Social Formations: The Case of the Interlacustrine Kingdoms (1991) is one of the ‘forgotten’ classics on knowledge production for African environments. The African researcher and knowledge producer – now faced more than ever before with the dual task of a) the need to produce knowledge that speaks to African-lived realities and b) finding, cementing and sustaining his/her place in the universal wheel of knowledge production – has unfortunately, due to social, economic and political circumstances, delved deeper into the abyss of scanty methodological articulations, non-significant theoretical propositions, simplistic conceptual angles and praxis orientations that are quite divorced from his/her everyday life. Breaking the cycle of myth-hunting is thus a critical methodological dialogue with Archie Mafeje. It is written with two objectives in mind: first, uncovering what the myth-hunter metaphor entails; second, presenting, to use an Habermarian conceptualizatio...

可変ピッチプロペラを用いた立位および転がり移動可能なマルチフィールド対応リング型飛行ロボット

In order to enable disaster rescue and information collection for disaster aid, we have been working to develop collaborative field robot system with multi-rotor extended robots. In this paper, we propose new multi-rotor flying robots that have special functions beyond flying ability. The robot is named MUWA: Multi-field Universal Wheel for Air-land Vehicle with Quad Variable-pitch Propellers. MUWA is variable pitch quad-rotors flying robot for multi-field locomotion, that is, standing and rolling at a given tilt angle on the ground like a tire, along with floating and moving on the water surface. The robot's purpose for action, structural design, basic control, and experiment of multi-field verification are covered.

Energy consumption of chipper coupled to a universal wheel skidder in the process of chipping wood

The chipper for chips is an energy consuming machine. Many factors influence the result of chipping which influence the whole process. The paper deals with the process of wood chipping by a chipper in order to determine its energy consumption. The main purpose was the determination of input power and comparison of revolution frequency on the outlet shaft of a skidder regarding the dimension of the torque depending on variable parameters which characterize the process of wood chipping during the measurement and the analysis of energy consumption of a chipping machine was carried out.

Omnidirectional Cart with Power-assist System

We provided a holonomic omnidirectional cart using a universal wheel with the power-assist function and put it into practical use as a meal delivery cart. Even if the cart weighs about 700 kilograms, it is easily operated as a manually operated lightweight cart. This report gives an overview of the new product, measures for enhancing operability, a handle sensing force in 3 directions, measures to reduce vibration during universal wheel driving, and ways to improve universal wheel durability.

ROLLMOBS, a new drive system for omnimobile robots

Typical mobile robot structures (e.g. wheelchairs or car-like robots) do not have the required mobility for common applications such as displacement in an office, hospital, workshop, etc. New structures based on the “universal wheel” (i.e. a wheel equipped with freely rotating rollers) have been developed to increase mobility. However, these structures have important drawbacks such as spurious vibrations and limited load capacity. This paper presents a new type of omnimobile platform using an original combination of spherical wheel and universal wheel. This structure will improve the robot capabilities, i.e., load capacity and surmountable bumps.

A multibody approach for modelling universal wheels of mobile robots

Typical mobile robot structures (e.g., wheelchair or car-like robots) do not have the required mobility for common applications such as displacement in a corridor, hospital, office, etc. New structures based on the ‘universal wheel’ (i.e., a wheel equipped with free rotating rollers) have been developed to increase mobility. However, these structures have important drawbacks such as vertical vibration and limited load capacity. In order to predict both their kinematic and dynamic behaviours, the resort to a multibody approach has been envisaged in this paper and a so-called ‘cam/follower’ contact model has been developed to take the universal wheel/ground interface into account. An experimental comparison of the model as well as the simulation of three designs of universal wheels are proposed before concluding the paper.

Contribution to the Modelling of a Mobile Robot Equipped with Universal Wheels

Typical mobile robot structures (e.g. wheelchair or car-like, …) do not have the required mobility for common applications such as displacement in a corridor, hospital, office… New structures based on the "universal wheel" (i.e. a wheel equipped with free rotating rollers) have been developed to increase mobility. However, these structures have important drawbacks such as vertical vibrations and limited load capacity. In order to predict both their kinematic and dynamic behaviours, the resort to a multibody approach is envisaged here and generalized to deal with the universal wheel/ground contact phenomenon.