共查询到20条相似文献,搜索用时 8 毫秒
1.
汽车黑匣子抗干扰技术 总被引:1,自引:0,他引:1
汽车黑匣子是实时采集并记录汽车行驶状态的电子仪器,作用是保证行车安全和为道路交通事故责任分析提供信息,但汽车黑匣子工作环境恶劣,外界干扰大,需具有较强抗干扰能力才能正常工作。本文通过对汽车黑匣子所受干扰种类、作用部位及影响进行分析,从汽车黑匣子硬件和软件两个方面提出了各种抗干扰措施,能有效提高汽车黑匣子工作可靠性。 相似文献
2.
3.
4.
5.
6.
R. Leoni P. Carelli M. G. Castellano D. Peschiaroli C. Berger A. Gabutti S. Janos K. Pretzl 《Journal of Low Temperature Physics》1993,93(3-4):503-508
We report on improvements of the dc-SQUID instrumentation developed to study superheating-supercooling transitions of thin-film indium dots. In previous measurements on ordered arrays of dots with diameters larger than 100µm the flip signal of an individual dot in perpendicular magnetic field has been detected. In order to use these dots as superheated superconducting detectors it is necessary to reduce the dot diameter to lower the energy threshold and to avoid intermediate states. For these reasons, our effort has been to develop small and thick dots with diameter down to10 µm and thickness up to3.5 µm. At the same time the coupling with the dc-SQUID readout was improved using a thin-film niobium pickup coil integrated on the same chip containing the dots. Phase transitions of individual dots were observed. The superheating phase transition spread in temperature of the samples was about 0.15 %. 相似文献
7.
8.
9.
10.
11.
12.
N.A Waterman 《Materials & Design》1982,3(2):390-400
This paper examines the hypothesis that appropriate materials substitution in the UK motor industry could reduce the Nations dependance on imported raw materials. It is believed that most of the findings apply to all Western European countries involved in the mass production of automobiles and also Japan. Current trends in materials substitution in the typical mass produced automobile are governed by legislation and cost and have resulted in some replacement of steel by plastics. This trend is expected to continue but only at an evolutionary pace. Hence although plastics are derived from indigenous raw materials (crude oil) and metals must be imported or obtained from secondary sources, the impact on the balance of imported to indigenous materials will be small.If greater fuel economy were to become mandatory the need to reduce weight in vehicles would increase the attraction of plastics based materials for large body parts. However with existing plastics processing technology production rates would be slower and vehicles consequently much more expensive. 相似文献
13.
14.
15.
The role that SAW (surface-acoustic-wave) resonators have come to play in high-performance test instrumentation is reviewed. The contributions made by SAW resonators in a number of Hewlett-Packard (HP) instrument applications are detailed. SAW-controlled oscillators are now the preferred design for precision frequency-control applications in the frequency range 200 MHz-1 GHz. The challenges in device design, fabrication, packaging and testing for these demanding applications are discussed. 相似文献
16.
Fuzzy handling of measurement errors in instrumentation 总被引:1,自引:0,他引:1
Mauris G. Berrah L. Foulloy L. Haurat A. 《IEEE transactions on instrumentation and measurement》2000,49(1):89-93
This paper focuses on the use of possibility theory and of fuzzy subset theory to deal with the uncertainty of the measurements handled in instrumentation systems. Methods are described for building fuzzy subsets from numerical data coming from imprecise “physical” sensors on the one hand, and handling approximate estimations provided by “human” sensors on the other hand. The propagation of the fuzzy representation of acquired measures in further treatments, such as those involved in performance indicators aimed at controlling manufacturing production, is also considered 相似文献
17.
18.
2010年,随着金融海啸的退潮,全球经济正在复苏,各国汽车市场也迎来了春天,其中一些国家的汽车市场已经成为汽车出口新的增长点。我国汽车企业如何积极抢占这些新兴市场,拓展我国汽车的生存空间,如何突破这些国家的技术门槛和贸易壁垒,如何适应风俗习惯和气候差异,顺利进军这些市场, 相似文献
19.
我国正由汽车工业消费大国向汽车生产大国过渡,汽车工业在GDP中的比重不断攀升,已成长为国民经济支柱,目前已基本形成汽车产品自主开发和技术创新能力.面对日益突出的能源及环境保护问题,以及正面参与国际竞争的压力,汽车产品的竞争要素也在不断转变,动力总成作为汽车产品的关键核心部件,在其中扮演着举足轻重的角色.随着竞争环境的复杂多变,以及顾客需求的多样化,汽车动力总成产品新的竞争局面正在形成,由单纯的追求性能,发展成为目前面向节能、环保、安全及发展循环经济的国际竞争,分析了中国汽车动力总成节能、环保的主要课题,阐述了目前汽车动力总成产品的主要技术,并剖析了一汽(FAW)的技术对策及产品战略. 相似文献