No Jobs? Young Graduates Make Their Own(三)

一个非营利性质的帮助台为年轻企业家提供指导和支持。每月解答来自创业者关于营销、公关和技术等问题,并在商业出版物中发布答案。尽管初创企业充满挑战,但鉴于当前高失业率背景,年轻人依然积极寻求创业机会。

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The council, which has applied for nonprofit status, serves as a help desk and mentoring hotline for individual entrepreneurs. People can also submit questions on subjects like marketing, publicity and technology, and each month a group of council members will answer 30 to 40 of them in business publications like The Wall Street Journal and American Express Open Forum, and on dozens of small business Web sites.

 

Council members assert that young people can start businesses even if they have little or no money or experience. But whether those start-ups last is another matter. Roughly half of all new businesses fail within the first five years, according to federal data. And the entrepreneurial life is notoriously filled with risks, stresses and sacrifices.

 

But then again, unemployment is 9.8 percent; Mr. Gerber’s in-box is flooded with e-mails from young people who have sent out hundreds of résumés for corporate jobs and come up empty. According to the National Association of Colleges and Employers, only 24.4 percent of 2010 graduates who applied for a job had one waiting for them after graduation (up from 19.7 percent in 2009). What do some people have to lose?

内容概要:本文详细探讨了基于阻尼连续可调减振器(CDC)的半主动悬架系统的控制策略。首先建立了CDC减振器的动力学模型,验证了其阻尼特性,并通过实验确认了模型的准确性。接着,搭建了1/4车辆悬架模型,分析了不同阻尼系数对悬架性能的影响。随后,引入了PID、自适应模糊PID和模糊-PID并联种控制策略,通过仿真比较它们的性能提升效果。研究表明,模糊-PID并联控制能最优地提升悬架综合性能,在平顺性和稳定性间取得最佳平衡。此外,还深入分析了CDC减振器的特性,优化了控制策略,并进行了系统级验证。 适用人群:从事汽车工程、机械工程及相关领域的研究人员和技术人员,尤其是对车辆悬架系统和控制策略感兴趣的读者。 使用场景及目标:①适用于研究和开发基于CDC减振器的半主动悬架系统的工程师;②帮助理解不同控制策略(如PID、模糊PID、模糊-PID并联)在悬架系统中的应用及其性能差异;③为优化车辆行驶舒适性和稳定性提供理论依据和技术支持。 其他说明:本文不仅提供了详细的数学模型和仿真代码,还通过实验数据验证了模型的准确性。对于希望深入了解CDC减振器工作原理及其控制策略的读者来说,本文是一份极具价值的参考资料。同时,文中还介绍了多种控制策略的具体实现方法及其优缺点,为后续的研究和实际应用提供了有益的借鉴。
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