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<正>工业设计是人类为了实现某种特定目的而进行的创造性活动,它包含于一切人造物品的形成过程中,是工业化过程中通过科学和美学、技术和艺术互相渗透、互相影响创新产品的一种创造性活动。从它近年来的发展趋势看,已经在生产领域中独立出来并成为现代产业体系中的一个尖端服务产业;从它的创新特点看,它 相似文献
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The light weight heat treated B-grade bulletproof steel was developed through composition design and optimization based on multiplex alloying, multiplex micro-alloying design ideas and complex phase structure strengthening theory. The puzzle how to avoid the quenching deformation problem of super high strength thin sheet was solved through heat treatment in a die with a set of cooling system. Such B-grade bulletproof steel plate has fine tempered lath martensite structure. The shooting and certification test results showed that the shoot resistance of B- grade bulletproof steel plate can meet the protection demand of Protection specification for cash carrying vehicles (GA 164--2005). In comparison with B-grade bulletproof steel plate made by one of the companies in Sweden, the weight of the developed B-grade bulletproof steel plate can be decreased by 8 % under the same shoot resistance condition. It will be meaningful for cash truck and anti-hijacking vehicle to realize light weight, energy conservation and emission reduction. 相似文献
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电启动机重量轻,体积小,启动方便可靠,有足够的启动功率和适宜的启动转速,且可重复启动,因此,被广泛用于农用车和拖拉机。许多农用车用户,在使用过程中,因操作不当,大大缩短了电启动机的使用寿命。为了延长电启动机的使用寿命,现将农用车辆电启动机的使用知识介绍如下: 相似文献
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Bulletproof steel plates are widely used for the safety of special vehicles. This paper mainly researches on the shoot resistance of heat treated light weight B-grade bulletproof steel plates through numerical analysis. Based on the flow behavior of bulletproof steel plates and bullet at various high strain rates, finite element (FE) model has been set up using ANSYS/LS-DYNA software. The simulation results are compared with the shooting results, which show a good consistency and a high reliability. Therefore, the simulation results are efficient approaches and strategies to decide and select the mechanical property and thickness of bulletproof steel plates, saving a lot of work and the cost of experiments. 相似文献
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微耕机是近年来推广使用的一种小型农田作业耕整机械,以其体积小、重量轻(100kg左右)、多功能而见长。宾川县农机管理站立足农机工作,始终不忘农机为农业生产服务这一宗旨,于1999年11月引进了一台四川产合盛12-105牌微耕机示范推广。通过不同土质地点耕整地后总结,机耕与牛犁、人工碎土相比每亩可节约30元,且耕深、土粒大小均能满足农艺要求。 相似文献
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《长安大学学报(自然科学版)》2005,25(3):10-10
科学家将纤维加入混凝土中,制成了一种重量轻、抗裂缝并且更耐久的可弯曲材料。研究者说,这种已在日本、韩国、瑞士和澳大利亚得到应用的新型混凝土2005年夏将首次在美国投入使用。用纤维增强的混凝土并非新事物。但密歇根大学研制出的这种纤维混凝土抗裂性比目前修建人行道的材料高500倍,重量也轻40%。混凝土是水泥、水以及沙子或砂砾的混合物。在修建桥梁和建筑物时,通常使用金属丝或金属条来加强混凝土。 相似文献