| 词汇 | example_english_stiffness |
| 释义 | Examples of stiffnessThese 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. Instead, as the solder cools, the gripper and stage stay put, within the limits of their mechanical stiffnesses. The pair of equations may be solved separately in terms of a general solution to provide two distinct coresponding joint stiffnesses. The actual stiffnesses of all three contacts were effectively infinite at high contact forces. However, we can talk about the stiffnesses of different materials. In this framework, link bending stiffnesses are replaced by equivalent torsional springs located at virtual joints, as described in reference. Nastran may be used to generate the physical system properties, such as masses, inertias, stiffnesses, and so on. Here, both the end effector position and joint stiffnesses are linearly interpolated between the two end states and the corresponding changes in joint configuration are calculated. However, most patients do not seem to show increased stiffness over longterm follow-up periods. The boundary of the domain does come into play in the construction of the stiffness matrix, but a mesh generator is not needed. We have already mentioned the importance of numerical integration in evaluating the elements of the stiffness matrix obtained from a meshless method. In these plots increased stiffness is upward: the gradient is ascended in optimization. The stiffness and stress of individual modules is examined first, followed by the performance of a composite structure of many units. The absence of any stiffness confirms the benign nature of the ultrasound abnormality. The parabolic equations are in principle easy to solve but possess a certain computational stiffness due to the thickness of the diffuse interface. More potential is also achievable by recognising that there are m free variable joint stiffnesses in equation (7). The clinical significance of the increased pulmonary arterial stiffness in the absence of stenosis remains to be clarified. The main characteristics and advantages, with respect to open-chain manipulators, are recognized as greater stiffness, better accuracy and larger payload. The stiffness of the virtual springs is determined using the structural properties of the flexible links as shown in reference [20]. In order to obtain the maximum global stiffness, seven architecture parameters will be considered as optimization variables, for a certain configuration. Application of genetic algorithms to stiffness optimization of laminated composite plates with stress-concentrated open holes. Moreover, the stiffness of each leg is improved due to the presence of the circular guide. The main clinical features are muscle stiffness, cramps and twitching (myokymia), which may be localized or generalized. A patient between age 50 and 92, usually over the age of 60, develops bilateral symmetrical stiffness and pain in the shoulders and upper arms. In 10% the bilateral stiffness affects the pelvic girdle, usually causing difficulty in climbing or descending stairs. The equation expresses that the stiffness of the spring decreases with increasing displacement from the rest position. If the value of is outside this range, the stiffness of many elements decreases. From a safety consideration it is desirable that the stiffness of such a device be adjusted to the person's movement characteristics. However, relatively high stiffness keeps the magnitude of coordinates small. To be applied to the parallel kinematics machine, the system's stiffness is one of the most important problems. The deflections are used to compute the stiffness forces in the direction of element axis as well as the stiffness moment. Therefore, we do not consider this stiffness in the following arguments. The stiffness k(t) denotes the time varying system property. The robot was controlled by an impedance controller, which produced a constant isotropic end-point stiffness and damping. The objective of this simulation is to test the performance of the unified force controller during transient phase when contacting with environment with different stiffness. The mass and the stiffness of the system are assumed unknown. In this case the environment is assumed to have a constant stiffness. Even in a high stiffness environment, the robot force control generates motion and the friction can affect transient performance. Furthermore, the present study showed that the stiffness of the pulmonary trunk was less than that of its branches in the control group. In this paper, we study the inverse problem of reconstructing the stiffness coefficients of a steel-concrete composite beam by using a different approach. Due to possible stiffness in the reaction scheme, an implicit method is required for the reactive contribution. The elements of the resulting stiffness matrix are integrals, which have to be numerically evaluated over various regions. While this is surprisingly different from the as-built predictions, the overall system stiffness is of more interest, which we'll investigate in the next section. Then, the global velocity equations are derived and the stiffness models of the two configurations are presented and analyzed. Therefore, the stiffness at the point of the designed manipulator should be checked. The manipulator stiffness affects the dynamics and the position accuracy of the device, for which stiffness is an important performance index. Higher velocity is related to lower distensibility and higher stiffness. Both can lead to short-term inflammatory reactions (stiffness) which disappear within a few days. The pulse wave velocity is a wellestablished index of arterial stiffness and distensibility. The surface stiffness affect the lower bound of the contact damping gain and consequently the speed of response when in contact. The method first identifies the linear stiffness and damping contributions to the system dynamics from the contact force by linearizing the contact force model. The left anchor indicated no pain, stiffness, or dysfunction while the right side indicated extreme levels. Because morning stiffness, pain level, and swollen joints are measures of health status, median values are chosen. Figure 1 shows the basic principle of an active stiffness control. Stiffness and damping is a concept that is readily understood by the potential client group using this type of technology and the associated health-care professionals. In particular, workspace and stiffness have been tested since they are critical aspects in robotic surgery. In particular, workspace and stiffness performance have been tested since they are critical aspects in robotic surgery. The results show the robot capable of implementing an impedance control strategy with varying stiffness and damping parameters. The reduction in the stiffness and damping parameters from task 4 enables an improvement in the sinusoidal input force. The electric atmospherics, without flesh, frozen, cold, almost macabre, are animated by dry movements, unpitying in their stiffness in their surges and disappearances, although non-violent. In particular, the determination of groups of element stiffness matrices can be allocated across multiple processors while incurring only a small computational overhead. The distortions are a reflection of the stiffness or elastic properties of the tissues under the investigation. The design criteria developed through this procedure account for the strength and stiffness of the manipulator and the required transducers and instrumentation. A more elegant way to implement variable compliance is to use pneumatic artificial muscles, where the applied pressures determine stiffness. The impedance controller with damping and stiffness has been experimentally implemented on all three degrees of the pneumatic robot. We prove that the shearing stiffness coefficient can be reconstructed from the frequency response function of the system evaluated at one end of the beam. Most bicycles can be described by a common set of design variables wheel size, position of top bar, stiffness, weight, cost, etc.!. The same is also true when the stiffness matrix is 'almost' singular. We have noted before that the linear system obtained from the meshless method is consistent even if the stiffness matrix is positive semi-definite. At term, stiffness of the rodent cervix decreases, and strength increases 20-40 fold compared to non-pregnant animals. Secondly, the stiffness of the pulmonary arterial wall or its surrounding tissue may increase as the degree of fibrosis progresses after operation. Sievers et al2 showed that aortic stiffness was increased after an arterial switch operation following banding of the pulmonary trunk in patients with complete transposition. The time-varying values of stiffness and viscosity coefficients at the end-point were computed by cross-correlating input torque with output displacement. At this point vertical and horizontal planes have interchangeable roles, and therefore need a structure with stiffness in all directions. Thus, there is no absolute optimum length, or optimum stiffness, for handles. Late life depression is associated with arterial stiffness: a population-based study. One possible explanation for this absence of stiffness could be the limitation in the excursion. Isoflavones reduce arterial stiffness: a placebo-controlled study in men and postmenopausal women. Again, prolonged immobilization of a joint may achieve effective union of a bone at the expense of joint stiffness and gross muscle weakness. A generalized stiffness matrix is derived for stiffness mapping. The stiffness of spring z can also be adjusted, scaling the overall frictional force. Fibrosis of the ventricular myocardium results in increased tissue stiffness, which can have serious consequences on contractile function. In the newborn heart its contribution might be different because of increased heart rate and stiffness. In that limit, the extreme stiffness of the free surface allows it to bear the increased velocity by a small deflection. They can be viewed as the stiffness and damping contributions of the contact interface to the system dynamics. When the stiffness of the contact object is identified, adding a mass property to the model makes the system slower. Here, we neglect the axial deformation and the effect of longitudinal loads on lateral stiffness. Therefore, it is necessary to design the mechanism taking into consideration the tip stiffness in all the positions of the motion area. Simulation results - the inertia, damping and stiffness forces of the elastic lamination produced by the motion of the robot and platform. A suitable comparison could be obtained by using the determinant, trace, or eigenvalues of the stiffness matrices. High obstacle stiffness allows us to neglect local deformations at the contact point. In addition, a number of tests have been carried out to examine the effect produced by a change in the stiffness of the environment. The intentionally introduced dependence of environment stiffness on the manipulator displacement makes the process nonstationary. The disadvantage of such a setup is that the stiffness can't be changed. Modular robots damping of each module, which is similar to the calculation of the stiffness matrix. A formulation is proposed for a stiffness performance index by using the obtained stiffness matrix. By the algorithm for flat surfaces, the normal direction, the stiffness coefficient, and the friction coefficient are estimated. The deformation is depended on the manipulator stiffness and the external force. The design with respect to the stiffness criterion can be also implemented using this concept, and so others. 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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