Woodwind Ligature Mass-Loading for Resonance Control
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Solution Overview
Problem
Existing ligatures for woodwind instruments do not effectively reduce interfering vibrational frequencies, affecting the tonal quality, playing freedom, and intonation of the instrument.
Innovation Solution
A ligature design featuring a strap with cylindrical rods and compliance features, such as slots and a cushion, that encircles the mouthpiece and reed, providing mass-loading to lower internal resonances and enhance vibrational compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a typical prior art ligature is used, then the reed can vibrate with greater freedom, but the ligature generates interfering vibrational frequencies that affect tonal quality and intonation
Solution Approach 1:
The patent applies mass-loading by attaching heavy cylindrical rods to the ends of the ligature strap. These rods act as counterweights that lower the resonant frequencies of the ligature itself, creating a frequency mismatch between the ligature and the reed vibration range. This prevents the ligature from generating interfering vibrational frequencies while allowing the reed to vibrate freely.
Solution Approach 2:
The patent changes the mass parameter of the ligature by adding cylindrical rods with significant weight (e.g., 1-2 ounces each). This parameter change fundamentally alters the vibrational characteristics of the ligature, shifting its resonant frequencies below the audible range or away from the reed's operating frequencies, thereby eliminating harmful vibrations while preserving reed freedom.
2Object-generated harmful factors
If mass-loading is applied to the ligature, then internal resonances are reduced and tonal quality improves, but the ligature structure becomes more complex
Solution Approach 1:
The mass-loading is achieved through simple cylindrical rods attached to the strap ends, avoiding complex internal mass distributions. The rods are externally mounted and can be easily secured with basic fastening mechanisms, maintaining structural simplicity while achieving the desired frequency reduction effect.
Solution Approach 2:
The ligature combines different materials with complementary properties: a flexible strap material (rubber, rubberized fabric, or metal) for vibration absorption and compliance, plus heavy cylindrical rods (metal) for mass-loading. This composite approach achieves frequency reduction without requiring complex monolithic structures.
3Object-generated harmful factors
If heavy rods are attached to the strap ends, then the frequency band of internal resonances is lowered, but the manufacturing process becomes more difficult
Solution Approach 1:
The ligature is segmented into distinct components: a strap body and separate cylindrical rod elements. This segmentation allows each component to be manufactured independently using standard processes, then assembled together. The rods can be produced separately and attached to the strap ends, simplifying the overall manufacturing process compared to creating a single integrated mass-loaded structure.
Solution Approach 2:
The use of standard cylindrical rod shapes and basic attachment methods (such as crimping, riveting, or threading) keeps the manufacturing process straightforward. The rods are common hardware items that can be easily fabricated and secured, avoiding complex manufacturing steps while achieving the mass-loading effect.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The ligature improves tonal quality, playing freedom, and intonation by reducing internal resonances, allowing for greater depth and accuracy in musical performance.
Implementation Method 1
The relatively heavy rods in conjunction with the compliance features lower the frequency band of the internal resonances of the ligature
Implementation Method 2
A cushion made of a resilient material, such as rubber, is located within the slots between the layers of overlapped strap
Data Source
AI summary
A ligature is provided for use in a mouthpiece system for attaching a reed to a mouthpiece of a woodwind musical instrument. The ligature is constructed from a single layer of flexible strap of rubberized fabric, having two ends to which rigid bars are fixedly secured. The ends of the straps and rigid bars are brought together to form a loop that is placed over the mouthpiece and reed. A threaded closure mechanism is used to tighten the ligature around the mouthpiece. The ends of the strap are crimped into slots in the rigid bars to secure the masses to rigid bars. A cradle constructed from a rectangular piece of spring steel is attached to the flexible strap and is located on the interior of the loop to contact the reed along two lines.