| 词汇 | example_english_acceleration |
| 释义 | Examples of accelerationThese 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 magnitude of this model uncertainty is also dependent upon the accelerations of the first i - 1 joints. There are, however, changes in curvature along its trajectory representing accelerations or decelerations. A theory is developed which permits computing the response of such bubbles to accelerations. Summing up, radially bound and unbound trajectories, and also substantial axial accelerations, can be obtained depending on the initial conditions and the beam polarization. The velocities and accelerations are obtained by differentiating the trajectory function once and twice with respect to time, respectively. First, at the beginning of the tests - time t = 0 [sec] - the desired joint positions qd, velocities qd and accelerations qd are zero. Namely, the vehicle must perform a series of accelerations and brakings. The joint velocities and the joint accelerations of the manipulator at the start and goal positions are all zero. If joint (angular) accelerations qj exist, then qj and qj will exist and be continuous, and it is called that the qj are smooth. Thus, velocities and accelerations estimated in such a way are useless, and need appropriate filtering before usage. Constraints on joint angular velocities and accelerations are taken into consideration. The inverse dynamic model gives the motor torques or forces as a function of the joint positions, velocities and accelerations. The passive joint positions are calculated from the geometrical relationship and thereafter differentiated numerically to obtain the respective velocities and accelerations. To correct the desired limbs accelerations, we use the equation of transformation of the accelerations. The characteristics of the robotic joint accelerations under faulty conditions have been exploited in reference [9] to detect robotic faults. We have described an impactless heel-touch together with the continuity of actuating torques at phase transitions through the continuity of joint accelerations. Such constraints may govern velocities, accelerations, relative positions, size restrictions, and systems properties. Biologically generated accelerations are often brief, but this does not imply that they can be (or are) ignored. There was good agreement between computer and visual analysis for fetal heart rate baseline and the number of accelerations and decelerations. The results apply regardless of whether accelerations are produced by pressure waves in a non-steady flow or by curvature of streamlines in a steady flow. The particles change their positions by the application of simple forces or accelerations. Typically, particle swarms use similar accelerations, except that a swarm does not implement velocity matching of near-neighbours. Indeed, large accelerations can be seen within the first few 10 fs, but this does not represent a statement of great impor tance. Winding motion ascends and descends with fluctuations in motion accelerations, leading back to its origin (figure 1). The velocities and the accelerations at the start and goal positions are all zero. The connecting mode ensure the continuity of second derivatives, and consequently of joint accelerations at knots. Figures 6 and 7 show the end-effector program motion and joint positions, velocities and accelerations. Finally, kinematic analyses for the angular velocities and accelerations of the links and unpowered joints are presented. Joint speeds and accelerations are obtained from the first and second time derivatives of (24). The idea of path planning with constraints on the robot's accelerations is presented in reference 12. In order to do so, the pseudoinverse must be formulated in terms of accelerations. Later, the joint accelerations are "corrupted" by a small amplitude uniform distribution noise with zero mean that is added to the signal. The second ones start from the equation of motion expressed as an inverse dynamic problem and, hence, also require information u about the generalized accelerations. Figure 4 shows the accelerations of the wok in the x and y directions. At the starting point (t = 0 seconds) and the final point (t = 30 seconds), the joint accelerations were also required to be zero. The accelerations at the two positions are specified to assure smooth motions. Velocities and accelerations of these links are also taken into account due to their influence on the actuators sizing. Furthermore, this approach also allows calculation of the joint velocities and accelerations in the frequency domain from the measured position response. The control law considered previously of such systems,2 assume that joint displacements, velocities and accelerations are available. Safe: avoiding the planning of velocities or accelerations that lead to dangerous motions. Figures 25, 26, and 27 illustrate the real accelerations in joints 1, 2, and 3 in the second trial, respectively. The second is a recursive approach whereby a model predicts a sequence of future ground accelerations by feeding back its predictions to its inputs. They found fair to good agreement amongst 10 experts in determining fetal heart rate baseline and the number of accelerations and decelerations. Since the heavy fluid spreads as it becomes mixed, the magnitudes of these effects change with distance producing accelerations which further complicate the flow. In tidal theory one makes the basic assumption that the vertical accelerations are sufficiently small for the vertical pressure gradient to be regarded aa hydrostatic. As mentioned previously, it is across the plane normal to the direction of propagation that the wave profile, water-particle orbits, velocities and accelerations change significantly. Electrons from early accelerations are reflected at rear of target. Similar relations can also be written for the accelerations and tangential forces in the transversal direction. The simplest method of estimating joint speeds and accelerations is to divide the differences between two successive joint displacements and speeds by the trajectory time. Static compatibility can be sufficient for systems moving with negligible accelerations. In addition, both velocities and accelerations do not show high frequency oscillations that can be dangerous for durability of actuator operation. They denote just the positive, as well as the negative parts of accelerations, and they have been introduced merely for the reason of distinction. Usually, these boundary conditions are the initial and final positions, velocities, and even accelerations of the manipulator and joints. If a joint is commanded to travel to speeds or accelerations that exceed the motor limits, the motor will saturate, and path deviation may occur. Effects of different configurations of the unpowered joints on the angular velocities and accelerations of the links are considered. With joint masses m1 = 20.7 kg and m2 = 2.2 kg they permit producing very high accelerations and velocities. 409 measured yet and it is impossible to calculate the position out of the movements of the robot because the accelerations are not measured. Unlike the link extension rates and accelerations, the angular velocities and accelerations of the links depend on the specific types of the joints at the two ends of the struts. Constant orientation problem with constrained joint velocities and accelerations: variation of third joint angular velocity with respect to time. The direct dynamic model is used to simulate the robot dynamics, it permits to calculate the joint accelerations as a function of the input torques or forces. Not being a physical theory and, hence, not including anything about velocities, masses, forces, or accelerations, kinematic geometry neither describes nor predicts actual trajectories of any material bodies. Each model was presented with a star ting sequence of ground accelerations as input and then allowed to run recursively for 100 iterations, as described earlier. Using this approach, it is possible to simulate the ground accelerations generated by an ear thquake at a specific location, as far into the future as necessary. Constraint equations are derived in terms of position variables and are differentiated twice to lead to a relationship in terms accelerations, which integrate the separate controllers for stability proof. The accelerations of the helicopter's lateral and longitudinal motion depend on the thrust vector. I n turbulence pressure-induced accelerations cause fluid particles to forget the history of their motions and two flow fields which are initially almost identical will quickly diverge. First, since the cylindrical shear layers are not uniform along their length, it cannot be expected that pressure gradients can just provide the centripetal accelerations and leave no radial flow. In this subsection, first, these accelerations are substituted by the dynamic equations of helicopter 2, which include the inputs, to give a subset of the input-output equations. Constant orientation problem with constrained joint velocities and accelerations: variation of fifth joint angular velocity with respect to time. Constant orientation problem with constrained joint velocities and accelerations: variation of second joint angular velocity with respect to time. Constant orientation problem with constrained joint velocities and accelerations: variation of sixth joint angular velocity with respect to time. In fact, it could be easily verified that the hand motion height is lower when pulses are shorter and accelerations higher, for the same amount of transferred energy, of course. Equations (9) and (10) have been implemented in a numerical simulation in order to compute the velocities and accelerations of the phalanxes during the operation of the designed mechanism. To overcome this constraint, additional inertial accelerations, from the second or third momentum equations, must become important, at least in a limited region near the top of the crest. The results are indicated in figure 4 by the filled-in symbols and verify that the bubble moves with the flow as long as accelerations are absent. Consider, first, accelerations by shock waves. Note also that, given the least squares property of the pseudoinverse, is the vector of joint torques that results in a joint accelerations vector q of minimum norm. Here the transient terms are accelerations. At least one fetal movement or three accelerations present. Constant orientation problem with constrained joint velocities and accelerations: variation of first joint angular velocity with respect to time. Constant orientation problem with constrained joint velocities and accelerations: variation of manipulator end effector deviation from the path with respect to time. Constant orientation problem with constrained joint velocities and accelerations: variation of fourth joint angular velocity with respect to time. In most cases, the data are sequences of joint angles and motor currents, from which a sequence of joint velocities, accelerations, and motor torques are calculated. We have had to make adjustments and accelerations to meet the ever deteriorating international conditions. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 One has seen considerable accelerations in commodity prices followed by periods of severe correction. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 Although the straight-line approximation has been adequate for our purposes, it may be too restrictive for devices that exhibit substantial accelerations. Infants were presented with a looming image that approached under different constant velocities and constant accelerations. After determining the baseline fetal heart rate, accelerations and decelerations are determined. Also, they found that between 20 and 30 weeks gestation there was an absence of accelerations in 13% of their recordings. The strength of these accelerations is determined by a set of particle update constants. In developing the above dynamic equations, care has been taken so that generalized accelerations appear explicitly. Once the design variables are determined, the joint displacements, velocities and accelerations can be obtained by differentiating equation. Although the coupling in accelerations is linear, the implicit coupling in velocities and positions (displacements) are nonlinear. An alternative method uses three trajectory steps to use a quadratic polynomial to approximate the joints speeds and accelerations. If the assigned velocities are wheel velocities (forward kinematics), slip (due to the incompatibility, not because of accelerations) is inevitable. Structural flexibility effects are much more pronounced at high operational speeds and accelerations of the end-effector. In each position of the arm, the angular velocities and accelerations may be different. Different observers with different accelerations thus detect the vacuum to have different temperatures. In the presence of accelerations, the simulation traces will give rise to curved trajectories. 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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