| 词汇 | example_english_wheel |
| 释义 | Examples of wheelThese examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. The hierarchy at the clinic where the women are checked is also reflected in the different wheels circulating in the medical system. The dust follows a perfect arc as the wheels throw it up and gravity pulls it back down. The contact pressure between the drive wheels and the sphere is generated with pneumatic cylinders and regulated with solenoid valves. The vehicles represented inanimate objects, possessing wheels and more straight line contours. At some point in the 1950s, most manufacturers quietly omitted the wheels. To this family belong the mobile robots - basically legged and wheeled machines - and robot manipulators. The control inputs that govern the null-space motions are the same torques of the two wheels and the two arm motors. There are two motors mounted on the right and left wheels, thereby providing differential driving motion. The corresponding theorem for wheels with negation reads as follows. I think in any profession, most of the people will be spinning their wheels, unfortunately. Contour-following control of wheeled mobile robots from here on, kd (d) will be written as kd to simplify notation. Many theoretically challenging properties stem from the so-called non-holonomic constraints imposed by the rolling wheels. The trunk's motion realization must depend on appropriate actuation of each joint and contact forces transformed from wheels. Savage has recorded subjective responses to the city, and these are replayed as the bus ('a small homebase on wheels'?) approaches the relevant sites. The construction of wheels of fractions has the advantage that it need not destroy any structure. The most common contact sources in frontal impacts were seat belts and steering wheels. The wheels of the 1980s include three scales, but the lunar months are already not among them. Dynamics and stability of wheeled mobile manipulators considering the friction of the contact between the base and the ground was studied in ref. [17, 26]. Time-optimal trajectories for mobile robots with two independently driven wheels are presented in reference 14. 158 - obstacles avoidance; - tip-over of the system and skidding /slipping of the wheels. One needs to also take the rolling without slipping joint equation of the wheels. The orientation of the rotation axis is determined by the ratio of the velocities of the two drive wheels. The movement of rovers is based on various techniques like wheeled locomotion and legged locomotion. By commanding the same velocity to both wheels, the robot moves in a straight line. The robot's dead-reckoning is based on the encoder installed on each of its two driving wheels placed 55 cm apart. A range of practical examples illustrates the use of legs, wheels, and a combination of both. The motion of robot is controlled by the independent motion of its two differential wheels. The passively rotated direction cannot be controlled by itself; it is controlled by the other spherical wheels through the ground. Internal sensors (encoders) give information about the speed and the distance the robot wheels move. The first states how identities from semirings can be transferred to wheels of fractions. In the 1920s, in mountainous areas inaccessible to wheeled transport, women raised income by carrying fragile and liquid items from trading stores. Maybe the culture could not think how wheels could help. Using wheels instead of rings, both ideas are handled by the same method: by projection onto a quotient. A young man who didn't witness the accident saw the driver of an expensive sports car being wheeled away in a stretcher. Under this definition, windmills, water wheels, anemometers, and certain tree fruits and seeds are ' autorotating ' devices. Does a prefabricated restaurant have to have wheels to qualify as a diner? They use roulette wheels and other mechanical randomizers. A complete model should take into account the relationship between engine power, speed, gear efficiency, wheels contact and so on. Discussions on the design of robots equipped with universal wheels appear in reference [3]. Researchers in the field talk of constructions that involve making girders, wheels etc., which are just one millionth of a millimetre long. Drawing the wheels concentrically, the computation can be traced as a spiral. What options are there for the use of larger wheels? Figure 10 displays the desired linear velocities of the centre of the robot and the centre of its two wheels. We consider ideal linear damping to exist at the two wheels and the two manipulator revolute joints. As compared to wheeled robots or walking robots, a spherical rolling robot offers certain advantages. Studies have been carried out to assess these errors and to consider how best to overcome them5 ; the tested vehicles were robots with solid wheels. The front wheels are on the first step edge and the flipper is raised above the platform. The wheels are thus employed at the heart of biological knowledge. Most of the wheels circulating today do not include lunar months. The results clearly show that the friction properties between the wheels and the ground affect machine stability. The robot's wheels would jam if the robot pushed the wrong object such as another retrieval robot or the sides of the table. To offer reliable walking paths inside houses, we use a rail attached to the ceiling, instead of wheels on the floor. Both actions are then combined in order to deduce each wheel's angular speed. The linear speeds of the right and left wheels are then calculated. In this paper, a mobile robot with two independently driven wheels is considered, which can be steered to any position in the free space. Figure 1 depicts the physical configuration of the experimental wheeled autonomous mobile robot. However, all three drive wheels are used when the rotational axis is at some distance from all the three drive wheel's contact patches. In the first group, the principal excitations are induced by the wheels and their associated elements and by the engine group and/or the transmission. Furthermore, wheeled walkers seem to require fewer cognitive capabilities, which may be a crucial factor in some cases. The robot has octagonal cylinder shaped body and two driving wheels at the left and right side whose axis pass through the robot's body center. Depending on the contours, the controller gains for the right and the left wheels are selected having different signs or magnitudes. A platform with these wheels has instantaneous omnidirectionality, but it does not have isotropic omnidirectionality. Power from the micromotor is transmitted through gears to the axis, and then to the castor wheels via friction between the wheels and the ground. Here, it is assumed that the wheels of the mobile manipulator are locked in place. Thus, there is no rolling and the friction is only due to the stick-slip motion between the wheels and the ground. In order to make the robot move precisely on the surface, four omnidirectional wheels are used as the driving mechanism. A single sucker often adopts as wheels mode, and there is relative movement between the sucker and the wall surface. When the wheels turn, the vertical shaft (transmission gear shaft) doesn't move. Most tracking algorithms are designed for wheeled mobile robots. We have selected the s2 rather than the other wheels speed since this choice leads to a simpler and unique forward kinematics. Signals from the three whisker sensors and wheels encoders were read via digital inputs. In this section, we treat this problem by completing the set of nonholonomic constraints by additional expressions involving constraint reaction forces at the wheels. The two steering wheels are linked by a mechanical system that imposes steering angles of equal magnitude and opposite sign on both. The first condition is verified for any whose wheels are all identical and when the weight on each one of them is uniform. A wheeled trolley is therefore provided which can be wheeled up adjacent to the wheelchair. The vehicle had two servo motors driving the two active wheels. The alternative is a circular program that computes both wheels and primes according to demand. Slippage and deformation of wheels and uneven floor surfaces inevitably accumulate increasing errors in the odometry localisation. Witnessing meals on wheels leaving from the kitchen, or sharing time with part-time or temporary residents could change the relationship they have to their home. The goods range from tools and equipment (carts, wheels, barrels) to cloth and clothing, livestock, grain and foodstuffs. Intensively stocked shrimp are fed high-quality fish meal and require paddle wheels and air jets to maintain dissolved oxygen at acceptable levels. There are basically two types of mobile robots, namely wheeled robot and legged robot. Higher soil thrust is enabled through the use of grousers on the wheels at the expense of drive power. The chassis should allow adequate vertical travel of the wheels as they encounter obstacles. Thus, the presence of features such as mouths, eyes, or wheels can be reliable similarity cues. Primary tillage and intercultivation were done with a tropicultor, an animal-drawn wheeled tool carrier. On no account should the bed have wheels. As he did not look where he was going, the car's near-side wheels started running along the grass. Several towns in the valley have textile industries which started when water wheels were used for power and local sheep provided the raw wool. They are interdependent like two wheels of a carriage that can only function together. The steering wheels are mounted directly on the trailer. The structure does not present any singular configurations as does an omnimobile robot equipped with off centred wheels. Another solution consists in using spherical wheels in order to overcome the limitations inherent to the small size of the rollers. After a while, they stopped pushing if their wheels jammed or if they considered that they have completed their push. The castor wheels have pure rolling movement during steering, which makes the microrobot chassis keep its pose. However, these forces are useful in determining and maintaining contact stability of the wheels. To make a simple comparison, consider the case of a vehicle with four wheels one manipulator link. Since the robot is only expected to have to negotiate small grades, it only incorporates suspension systems at the two lateral wheels. From all admissible angles the one closest to the angle commanded by the driver is set at the front wheels. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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