Figure 6.3. Dependence of the coefficients of recovery and filling of characteristic on the rigidity of the spring cn of a hydraulic shock absorber for varying masses and initial velocities. Mass in kg, velocity in m/s, X-axis: cn 104, N/m. This coefficient characterizes the efficiency of the force characteristic: the closer is to unity, the smaller the course of the shock absorber to absorb a certain energy at a given maximum force. Generally speaking, the largest value of the coefficient of filling is reached at maximum velocities, at which the shock absorber absorbs the largest amount of energy and has the largest course. For a constant force along the course of the shock absorber . From the examined point of view this shock absorber is optimal. Thus it is reasonable to use a friction brake if one does not need the shock absorber to return to its initial position. It is obvious that for a spring without initial compression . For a linear shock absorber the coefficient of filling 3 depends on the correlation of its parameters (see Figure 6.2). As is obvious from the graph, at relatively small values of (0.2-0.3) the coefficient fc3 has a value of 0.5-0.95. For a hydraulic damper the coefficient of attenuation and the rigidity of the spring may be chosen such that is close to 1 (see Figure 6.1). The value of the coefficient of recovery in this case and at maximum initial velocity is relatively small (0.2-0.3). It is obvious that as the initial velocity is decreased the efficiency of the damper rapidly decreases, and the coefficient of recovery increases, approaching values of 0.8-0.9.
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