Engineering Service
Non-standard customized testing services
1. Engineering challenges in the field of product acoustics
Testing requirements:
· The sound wave direction is uneven in the general location of hole-blocking tape;
· Conventional standard tests focus on normal and diffuse sound fields;
· How to perform the performance test of this plugging tape?
Testing requirements:
· Waterproof sound-permeable membrane is mainly used to protect electronic audio equipment;
· It basically has no obstruction to sound, and each company has its own standards for small sound holes;
· How to effectively test its performance?
Test requirements:
· The damping arrangement is located in thin-walled parts such as the car chassis and front wall;
· The noise in the cabin is caused by structural vibration excitation;
· How to effectively evaluate the noise reduction effect of this type of product when using it?
· BOACH acoustic solutions: Provide customers with non-standard customized testing services based on the actual use of the product ;
2. BOACH acoustic typical non-standard customized testing services
2.1 Damping plate radiation noise detection:
· The detection method independently developed by BOACH Acoustics has been used by many OEMs!
· The test bench has supported the publication of multiple SCI high-level papers at the same time, and is currently recognized by the industry and profession.
2.1 Body block sound insulation inspection :
· BOACH Acoustic’s customized plugging test plan effectively combines the plugging and surrounding substrates, making the evaluation results closer to reality!
· Problems with conventional impedance tube testing: Due to the influence of the law of mass, the sound insulation performance of the plugging material can never surpass that of stainless steel.
Body block sound insulation test plan 1 and samples
Effect:
1) Implemented in accordance with the GB/T impedance tube sound insulation standard, but no transition section correction is performed;
2) The transition section provides diffuse incidence (sound waves are not completely normal);
3) Used to evaluate the sound insulation effect of different plugging sheets ;
4) The sample takes into account the actual working conditions of the body steel plate, and the evaluation results are more representative.
5) The outer diameter of the sample: 126mm, which is much larger than the opening;
6) Compared with the conventional impedance tube test, it cannot evaluate the hole plugging effect;
Reason: Resin sound insulation cannot surpass stainless steel!
Body plugging sound insulation test plan 2 and samples
Effect:
1) Approximate to the SAE JS standard, but it uses an array sound source cabin for sound insulation testing;
2) Evaluate plug insertion loss;
3) Closer to the real situation of vehicles;
4) The cost of sample testing is relatively The cost of traditional reverberation chamber testing is controllable;
5) The effect of plugging performance improvement above 0.2dB can be distinguished;
6) Test sample size: 0.5X0.5m plate plugging hole.
2.3 Testing of waterproof sound-permeable membrane for mobile phones
· BOACH Acoustics built a test bench according to the test standards to conduct WRM insertion loss test;
· Currently, the test bench has served many waterproof sound-permeable membrane manufacturers.
Waterproof sound-permeable membrane insertion loss test (SONY standard)
Evaluation results:
1) Build a test bench based on SONY test standards;
2) Conduct sound pressure tests with or without WRM radiation after different WRM applications;
3) Obtain WRM test results based on the IL standard calculation formula.
WRM insertion loss test-BOACH test bench
2.4 Insertion loss detection of high-speed rail/subway converter cabinet noise reduction scheme:
· BOACH Acoustics developed a 1:1 test bench based on the working principle of the converter cabinet, and passed the consistency verification of the noise reduction effect of the actual bench and test bench;
· At present, this bench has been used for the design and development of noise reduction products for converter cabinets.
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Room 901, Building 1, Phase 2, Yungu Phase 2, Fengxi New Town, Xixian New District, Xixian New District, Xi'an City, Shaanxi Province
Room 307, Building 1, Harbin Institute of Technology Robot Industrial Park, No. 488 Qianjin East Road, Economic Development Zone, Kunshan City, Jiangsu Province
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