一种弦振动与动态杨氏模量测量综合实验仪
By using a condenser microphone and tension adjuster in university experimental setups, the high cost and data deviation problems of string vibration and dynamic method for Young's modulus measurement in universities have been solved, enabling the study of strings made of different materials and the accurate measurement of Young's modulus.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HUNAN UNIV OF TECH
- Filing Date
- 2025-03-04
- Publication Date
- 2026-07-17
AI Technical Summary
When universities conduct string vibration experiments and dynamic method Young's modulus measurement experiments, the costs are high and the data deviations are large. Existing devices are limited to studying magnetic strings, and tension adjustment is cumbersome, making it difficult to fully reflect the physical properties of materials under small deformations.
A condenser microphone is used instead of a receiving sensor. Combined with a tension adjuster and a digital push-pull force gauge, the study of strings made of different materials is realized. The tension is infinitely adjusted through a mechanical structure. The mechanical vibration is converted into an electrical signal by an exciter and a vibration pickup. The resonant frequency is found with the help of an oscilloscope to determine the Young's modulus value.
It reduced experimental costs, expanded the scope of material research, improved data accuracy and stability, and achieved a true reflection of minute deformations in materials.
Smart Images
Figure CN224518413U_ABST
Abstract
Claims
1. A comprehensive experimental apparatus for measuring string vibration and dynamic Young's modulus, comprising a digital signal generator, a low-frequency power amplifier, a tension adjuster, an exciter, a string, a vibration pickup, a digital push-pull force gauge, an oscilloscope, a guide rail, a loading platform, a baffle, and an alloy hook. The exciter includes a horn, a support frame, a housing, a signal output interface, fixing screws, and a rubber clamping edge. The vibration pickup includes a condenser microphone, a microphone amplifier module, a paper cone, a support frame, a housing, fixing screws, a rubber clamping edge, and a sealing cavity. V The battery and signal output interface, the tension adjuster including a rotary handle, stainless steel sleeve, screw, set screw, spring, and hook, are characterized by: The speaker is fixed to the top of the housing with screws. The condenser microphone is placed in a sealed cavity and connected to the amplifier module. Support brackets are glued to the speaker and the condenser microphone respectively. The support brackets pass through the round hole at the top of the housing to support the string. The string is connected to an alloy hook. One end of the alloy hook is connected to the hook of a digital push-pull force gauge placed horizontally on the platform. The other end is connected to the hook on the tension adjuster. The tension adjuster is fixed in the round hole of the baffle with screws and is horizontally aligned with the string. The tension of the string by the tension adjuster is displayed in real time by the digital push-pull force gauge.
2. The string vibration and dynamic Young's modulus measurement comprehensive experiment instrument according to claim 1, characterized in that: The pickup unit contains a sealed cavity. A condenser microphone is placed inside this cavity and connected sequentially to the amplifier module and battery. The output interface is connected to an oscilloscope. The sealed cavity, with its support frame, passes through a circular hole at the top of the outer casing. A string is placed on the blade edge of the support frame, connected to an alloy hook. It is positioned at the same height as the tension adjuster and digital push-pull gauge. When the string vibrates mechanically, the vibration is transmitted to the connected diaphragm through the support frame. The support frame and the string contact each other through the blade edge. During installation, the string is positioned approximately 1 meter below the blade edge of the support frame. At a height of mm, the blade is pressed against the string to ensure vibration transmission. The sealed cavity inside the condenser microphone is a sealed space. When the cone vibrates, it compresses and expands the gas in the cavity, causing changes in gas pressure, which in turn produces changes in sound pressure. These changes in sound pressure act on the condenser microphone, causing it to shift and change its capacitance value, thus converting mechanical vibration into an electrical signal output. The digital push-pull force gauge is connected to one end of the rope to read the current tension value directly. It does not participate in tension adjustment itself. The stepless adjustment of the tension is achieved by the tension adjuster at the other end of the rope. This adjuster mainly consists of a spring and a rotating handle. Manually rotating the handle can continuously change the compression or extension length of the spring, thereby achieving stepless adjustment of the rope tension.