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US 6,915,756 B1Granted
Bells
AssigneeAustralian Bell Pty Ltd.
InventorsNeil Maxwell McLachlan, Anton Glenn Hasell
Life of this patent
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AssigneeAustralian Bell Pty Ltd.
InventorsNeil Maxwell McLachlan, Anton Glenn Hasell
Estimating the term…
A bell is described having the first at least three or more frequencies substantially in harmonic sequence. A method for designing such a bell is also disclosed. An optimization procedure is described wherein an initial bell shape is modified until the first at least three or more frequencies are substantially in an harmonic sequence. An asymmetric bell is also described wherein a meridonal cross-section of the side portion is substantially geometrically similar to a cross-section having: 1) an outer line formed by fitting an arc of a circle to the three described points of the nodes and an inner line formed by fitting a line to the described points of the nodes; or 2) having an outer line formed by joining a straight line to the two described points of the nodes and an inner line formed by fitting a line to the described points of the nodes.
A method for designing a bell shape for a bell having a plurality of modal frequencies, wherein the first three of said frequencies, at minimum, are substantially in an harmonic sequence, the method comprising the steps of selecting an initial bell shape and using the initial bell shape in an optimization procedure for modifying the bell shape such that said first three frequencies are substantially in an harmonic sequences, wherein said step of selecting the initial bell shape comprises choosing a starting geometry in which the lower frequency modes to be tuned by said optimization procedure are purely circumferential modes.
An axisymmetric bell having a top portion, a side portion and a mouth, the side portion extending from the top portion to the mouth, a meridonal cross-section of the side portion being substantially geometrically similar to a cross-section having:
An axisymmetric bell having a top portion, a side portion and a mouth, the side portion extending from the top portion to the mouth, a meridonal cross-section of the side portion being substantially geometrically similar to a cross-section having:
A harmonic bell having a plurality of modal frequencies comprised of means for producing the first at least two frequencies of the plurality substantially in an harmonic sequence and means for producing the third frequency of the plurality substantially in said an harmonic sequence, the means for producing the third frequency comprising choosing a starting geometry in which lower frequency modes are purely circumferential modes.
A bell having a plurality of modal frequencies, the bell having a bell structure wherein the lower frequency modes are purely circumferential modes, said structure including a top portion, a side portion and a mouth, the side portion extending from the top portion to the mouth, and physical characteristics of the bell structure being selected from the group consisting of conicity of the top portion, wall thickness of the top portion, length of the side portion, conicity of the side portion, wall taper of the side portion, wall curvature of the side portion, and wall thickness of the side portion, in a manner to provide optimal tuning means for producing a first three frequencies of the plurality of modal frequencies substantially in an harmonic sequence.
Dependencies are inferred from the claim text.