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Fengtai Softball Field Sports Center
The author: Cheng Zhong jun / Ceng Zhi Cheng
Fengtai Sports Center Softball Field Olympic softball competition was the main venue, like a half-open the "folding fan", set in the west of Beijing Fengtai Sports Center, with a total construction area of 15.57 thousand square meters, Holder median 5000, is the Olympic Games changed expansion competition venues, on the transformation is completed in June 2006, is Beijing's first completion of the first Olympic venue put into use.
Fengtai Softball Field, including a main games, an alternate venue, two training grounds and a functional allocation of flats, in addition to the main stadium grandstand and associated buildings and a fixed function of both the provisional allocation of flats outside the building, softball field design framework for the strict implementation of the Olympic Games. Deserves most proud of is the Advanced Communication Equipment (International) Co., Ltd. After fierce competition, to highlight the design of sound reinforcement system in one stroke to win baseball games general contracting qualifications.
My company's engineering staff under the softball field in architectural structure, with reference to a number of sports venues at home and abroad success stories, through rigorous calculation of sub-folded many times in the field lofting and multi-angle calculation, design a set of high stability, multi - functionality, versatility and scalability as one of the PA system.
Taking into account the wind, rain, thunder, snow and other outdoor factors, we chose JBL PD5000 series of all-weather, waterproof, high-performance loudspeakers. JBL PD5000 Series speakers are specifically aimed at the shortcomings and needs stadium designed in the sound field coverage and control, made a lot of hard work, focus on the sound energy projected onto the designated spectator areas, to avoid the interference generated by scattering and energy accumulation, significantly to improve the language for clarity and intelligibility. All units have adopted the patented horn design, ensuring good sound quality, it is also a regular speaker of the high prices and no Q value and very accurate full-frequency point features, especially in the main stadium audience using the wall surface mounted gantry crane unique approach to installation of loudspeakers, so that sound energy can be guaranteed only to act on the need to cover the area, but also flexible and easy to adjust speaker angle coverage.
That all speakers are equipped with the power to match the crown of the United States CROWN CTS series of power amplifiers. CTS Series is today a model of power amplifier design, unique damping is greater than 1000, so incomparably beautiful sounding bass; than 13V/ms conversion rate to make clear, bright treble anomaly; ultra-low phase distortion to sound more realistic nature; ODEP (Output device simulation protection) patented technology to solve the power amplifier overload shutdown problems and improve the efficiency of the output circuit; advanced IOC indicator to ensure that no distortion, high-performance power amplifier output; second low-frequency and DC voltage output protection, and ultra-high frequency and RF interference protection, can make speakers are not compromised; ground isolation switch to avoid the system signal with the power to cross-coupling caused by the exchange of hum. CTS series of metal packaging output devices, using advanced equipment and testing of each device's power curve and the peak power handling capability, through the use of screening and after pairing.
Mixer is a sound reinforcement system of central control equipment, according to actual needs, we use English SoundCraft GB series mixing console. Mixer in this series have been used on many occasions, its addition to the general sound reinforcement mixer with the basic functions owned by their grouping feature allows process control will simplify operations and reduce errors. In addition, each input channel has two input interface may be independent selection lines (high), or microphone level (low), while the 180-degree phase conversion function, this foreign performing groups is particularly important, because the phase of each country standards are may be different, when this issue occurs, SoundCraft GB series mixing console just press the button in question-channel phase can immediately be 180 degrees phase shift, the operation is very convenient.
Softball sound reinforcement system as a whole in the design and construction have encountered a lot of problems, such as the main stadium grandstand cantilevered cantilevered beam length, gradient and cross section are broad and irregular, for the construction and installation of sound reinforcement systems are very difficult. When installed in the forthcoming approach, due to changes in venue construction design, the original design speakers hanging point has been canceled, the installation location is specified in the public gallery behind the crib wall region, after detailed calculations, as well as re-EASE model calculation, the final set of the speaker installation point, details such as height and angle. However, the installation phase has a problem. It turned out that must be fixed according to the calculation speakers installed in the Qiangduo of about one meter above the location of the back of this box will be exposed to outside venues. As the audience is about more than 30 meters behind the residential area that is, owners had an event, it will flow performance loudspeakers placed in the space can be compromised or because the sound was disturbing complaints. Now, speaker box completely exposed to the venue over whether it will bring more noise to nearby residents do? Owner suggested the possibility of speakers placed in the bottom of pile wall. Our engineering and technical personnel through patient explanation, so that the owners have a real understanding of the JBL PD Series loudspeaker design principles and the reasons for using this installation, but also through field demonstrations so that the owners be able to understand to the JBL PD series loudspeakers with ordinary conventional loudspeakers difference, the owners finally agreed to install the program as designed, but still require an architect making contingency plans, once the speakers actually use the sound leakage, there must be a corresponding sound-dampening measures. Finally, to the completion and acceptance of that day, the venue resounded through the beautiful music, everyone nodded approvingly and said the approval of the sound, owners are kept inside, outside walking back and forth, repeatedly engaged in comparison, finally, they are exposed approved smile.
Completion and acceptance through sports center after the Olympic Games Fengtai Softball Field, not only successfully hosted the XI Women's World Softball Championship in 2008, sporting events, the more experienced nearly a dozen games test. International Softball Federation President Mr. Tang Bote right venue is very satisfied with, saying "This is the best softball in the history of one of the sites." Secretary-General of the International Softball Federation, Andrew Lei Qiele then commented: "I never expected such a perfect venue, it will leave for Beijing softball proud heritage, and become the best in China and Asia's training base." International Softball Federation Vice-Chairman Alan said that the Chinese people to get ready at this Olympic Games venues, in some respects, their work beyond the world level, this course is the world's top.