The 2.5D BEM used to calculate wheel sound radiation characteristics is presented in Sect.
In order to improve the calculation efficiency of wheel sound radiation, the axial symmetry of the wheel is utilised.
A preliminary analysis of the physical phenomena accounting for rolling noise generation emphasizes the key design parameters affecting both wheel and radiation.
He'd overwhelm his cravings by visualising a horrific memory of a cancer patient at Stanford's medical school, "on a gurney [stretcher], with x-marks on his head and exposed chest, being wheeled into radiation".
In tight curves, these creep forces can cause unstable vibration of the wheel, leading to the radiation of squeal noise.
For example, Schneider [7] used the ring element to build a finite element model for a train wheel and calculated sound radiation of the wheel using the Rayleigh integral method.
The influences of the wheel rotation speed on radiation directivity are shown in Fig. 12 for three frequencies, 1590 Hz (Fig. 12a, b), 1630 Hz (Fig. 12c, d) and 1670 Hz (Fig. 12e, f).
In four-wheel-drive Toyota Land Cruisers, with radiation detectors and the most advanced scanners to detect toxic microbes, the inspectors, in blue baseball caps, head out in the mornings from their hotel on the outskirts of Baghdad -- typically going first north, then south, then west, then east, then south again.
The influences of the wheel rotation speed on the radiation power contributions (the ratio of sound power radiated by a part to the total radiated sound power of the wheel) of the hub, web and tyre (including tyre, tread and flange) are shown in Fig. 13.
