2. System Structure The structure of SSLS is shown in Figure 1.
The SSLS designed based on "flexibility test" technology consists of a microphone array device, transmission cable and host computer:
The microphone array device has a unique design (standard array): There are 8 beams, and 8 built-in microphones are placed on each beam. Each beam connects each microphone to the main body bracket through the SMB interface, and a camera placed in the center of the main body bracket is used for real shooting. The entire device features: flexible, compact, lightweight, easy to install - when one of the microphone problems, just replace the corresponding beam, without making other changes; when you need to increase or decrease the microphone, just install or remove the corresponding beam . The entire microphone array device fully reflects the flexibility and expandability of the "flexibility test" technology.
The transmission cable is used to synchronously transmit the electrical signals converted by the array device to the system host. It has the characteristics of uniform length, isolation and shielding between channels.
The host is the core of SSLS. The hardware includes PXI chassis, controllers, and multi-channel dynamic signal acquisition cards. Eight dynamic signal acquisition cards realize the synchronous acquisition of sound signals, especially with anti-aliasing filtering function, with high precision, large dynamic range and other characteristics, designed for dynamic signal acquisition. The PXI chassis backplane bus provides a reliable guarantee for signal acquisition: 1kHz signals are acquired simultaneously across both channels of the board card with a phase difference guaranteed within 0.1 degrees; the controller provides a high-performance platform for real-time test and control applications. SSLS uses the system software developed by the LabVIEW environment. The software can control the system hardware to acquire and analyze the multi-channel sound signals synchronously. The beamforming technology is used to calculate the sound field distribution, and then the sound field distribution map is superimposed on the real-world image to visually reflect the noise. The location of the source. The system software also has the function of array effect simulation. The user can simulate the effects of various microphone arrays configured according to factors such as the environment and signal characteristics, obtain the measuring effect of the matching array, provide the basis for selecting an appropriate formation, and have strong Adaptability and expansion.
The choice of positioning algorithm: Considering the sound field conditions and the diversity of noise equipment, the system uses a beamforming algorithm. In this way, the array device can not only adopt a regular array, but also can use many irregular arrays, such as spiral arrays, random arrays, etc., making the application of positioning more extensive, able to deal with a variety of different conditions;
The choice of hardware and software platforms: Using virtual instrument technology, select the PXI hardware platform. Because the PXI bus has a large data throughput capability, it can meet the needs of synchronous acquisition of multi-channel dynamic data, and at the same time it is convenient to add or delete channels later, making the system have good scalability and flexibility;
Software technology: Considering that various array devices can be conveniently and quickly replaced when used, the modular design concept is adopted when designing the system software. When using different array devices, the operator only needs to import the corresponding array configuration file.
The design of the system also incorporates other design techniques, such as the design of the array device, and the use of modular interface technology, making the expansion, assembly, and disassembly of the array device both convenient and quick.
4, system function SSLS can make the sound "visualization", can help the acoustic engineer "see" the sound field distribution of the noise object under test, find out the position of each main sound source point, it is the sharp weapon that extracts the useful information from the complicated sound signal. Its functions include:
Sound source localization: Shows the relative energy of the sound field at various locations within the analysis plane. According to the energy distribution map, the location of each major sound source can be found.
Identifying different sound sources: Displays the distribution of the sound field in a specified frequency band, thus identifying the main sound sources in different frequency bands in a noisy sound environment;
Separation and analysis of sound source signals: The sound source signal of a specified position is separated from a complex sound signal, and then the sound source signal is subjected to sound playback and spectrum analysis, and the user can also perform custom analysis on the separated signal.
Spectrum analysis: According to user settings, spectrum analysis can be performed on acoustic signals for a specific time period;
Joint time-frequency analysis: display the energy spectrum information of sound signals with time and frequency as axes.
5, system characteristics SSLS fully integrates the "flexibility test" technology and sound processing technology, has the following characteristics:
Multi-source positioning: Within the allowed resolution range, the system can locate multiple sound sources simultaneously.
Convenient array placement: The system is different from the general near-field acoustic holography method. It does not need to put the microphone array close to the surface of the measured object (d<<λ), which increases the “vision†of the system and avoids the near-field sound. The holographic method has limitations on the position of the array.
Flexible array configuration: The system's array can be flexibly configured according to different sound field conditions, so as to obtain ideal analysis results, so the system can be applied to a variety of different sound field conditions.
Intuitive display mode: The system displays the sound field energy distribution on the measured object picture. By observing the picture, you can intuitively see the location of the sound source on the measured object.
6. Summary "Flexible test" technology is emerging test technology under complex and changing market pressures. The biggest advantage of this technology is that it can meet the complex and varied test and measurement requirements of different manufacturing industries. "Flexible test" technology integrates virtual instruments, test and measurement, mechatronics, network communications and software, and is a refinement of the multi-year technology precipitation in the test and measurement industry. SSLS is adhering to the concept of “flexibility testing†and considers meeting customer needs in a timely and effective manner as the ultimate pursuit. It fully considers factors such as variability, complexity, and cost feasibility, and has strong flexibility, adaptability, and expansion. Sex, can meet the needs of customers for a variety of sound field conditions analysis, easy installation, easy maintenance, fully comply with the development direction of modern test systems, is the perfect embodiment of "flexibility testing" technology.
CUMMINS
Huali Cummins Series select the Cummins engine.
Huali has been cooperate with Cummins for more than 10 years,
Huali Cummins series diesel generator set high reliability,low applied cost has won the industrial and mining enterprises and other industry preference.
Huali Cummins series diesel generator set as excellent transient corresponding sacrifice,advanced economy,power performance and reliability, long service life etc.
Perkins
Huali Perkins series diesel generator set is positioned to its value of:
1. Leading adaptability in the industrial
2.Reliability
3.Lifetime low cost operation and service
4.Around global technical & service support
Design of Huali Perkins series diesel generator set is to provide our gen-set user a low investment/running cost solution,this goal is achieved by the advantages as follow:
- The right technology for specific industry; for example, low emission product mechanical fuel system makes the maintenance more convenient
MTU
The MTU history can be traced back to the 18th century. With the excellent and advanced technology, the MTU engine is one of the best quality products in the world. All HUALI MTU series diesel generator set will get 24 hour engine technical/after sale/parts support from more than 650 MTU dealer and service agent around the globe.
Engine Feature
1. MTU 2000 and 4000 series engine launched in early 1997, is the world's rare containing
MDEC electronic monitoring management system of diesel engine,series 4000, is the world's first application of sync rail fuel injection system technology of large diesel engine.
2. ADEC collection and self-inspection the main parameters while operation, realize complete combustion by the highly advanced electronic fuel injection. This technology ensures that MTU engine has the best fuel consumption rate, minimum start-up and the smoke, when the sudden load the best cold start performance.
3. The fuel economy and environmental performance in the current outshine others in the world, no overhaul period up to 30000 hours, far more than the other diesel engine 10000 to 20000 hours. MDEC system also provide a fault diagnosis and fault code display function.
4. MTU2000 and structure of 4000 series engine: water cooler, emission turbo, four stroke, V block 900 Angle, the 2000 series intake mainly air to air cold type, 4000 series water to air cold type.
5. MTU2000 and 4000 series engine emissions reached German air force TA LUFT standard, the
California Air Resources board CARB, US environment protection Bureau EPA and EURO
environmental protection standard II.
YUCHAI DIESEL
HUALI diesel generator set adopt YUCHAI diesel engine in Chinese market.
Formerly [Yulin Quantang Industrial Cooperative" found in 1951,Guangxi Yuchai Machinery Co.,Ltd.(Yuchai Machinery) is a Chinese-foreign joint venture.China Yuchai International Ltd. was listed on the New York Stock Exchange (NYSE:CYD) in 1994 as Chinese first engine enterprise listed abroad.Yuchai is Chinese largest independent diesel engine manufacturing base with the most complete product spectrum in China. Power range is from 10kW to 2646kW.
Other brands
Huali diesel generator set adopt other brand chinese brand ,such as SDEC ENGINE,WEICHAI POWER etc.As client request, we can produce diesel generator set.Huali other brands series diesel generator set as excellent transient corresponding sacrifice,advanced economy,power performance and reliability etc.
Different Brand Diesel Generator Set
Diesel power Generator set,Mobile Generator,3 Phase Diesel Generator,Industrial Generator Set
SHANDONG HUALI ELECTROMECHANICAL CO.,LTD , http://www.shanhuachina.cn