现代教育技术与《液压与气压传动》课程整合的实践探索

现代教育技术与课程的整合,对于课程建设与改革、提高教学质量具有重大意义。文章分别从多媒体课件设计,课程网站建设,计算机仿真实验教学这三方面探讨了现代教育技术与《液压与气压传动》课程整合的实践。     

基于AMESim的液压双缸同步动作仿真及试验研究

针对工程车辆中各机构液压双缸的同步作用,采用分流集流阀同步回路设计,运用AMESim软件中的液压仿真模块进行仿真分析,并通过试验对同步特性进行研究。仿真及试验结果表明,采用分流集流阀回路能够较好的满足同步性,同时AMESim仿真结果与试验相符合,具有较高的可信度。     

基于结构异地协同控制试验网络平台的开发与研究

结合我国国情建立远程结构试验网络系统，解决结构工程动力学科大型结构多节点试验资源不足的问题，分析了结构远程试验系统的组成以及网络远程协同控制的结构试验，初步实现把分布在各地的多个实验室连接在一起，利用各自不同的设备，完成复杂的试验和测试，同时让其他用户来实时观察所进行的试验，或参与试验过程，研究分析试验结果。     

False-performance feedback does not affect punching forces and pacing of elite boxers

Prior research indicates that providing participants with positive augmented feedback tends to enhance motor learning and performance, whereas the opposite occurs with negative feedback. However, the majority of studies were conducted with untrained participants performing unfamiliar motor tasks and so it remains unclear if elite athletes completing familiar tasks respond in a similar fashion. Thus, this study investigated the effects of three different versions of false-performance feedback on punching force (N), pacing (force over time) and ratings of perceived exertion (RPE) in 15 elite amateur male boxers. Athletes completed a simulated boxing bout consisting of three rounds with 84 maximal effort punches delivered to a punching integrator on four separate days. Day one was a familiarisation session in which no feedback was provided. In the following three days athletes randomly received false-positive, false-negative and false-neutral feedback on their punching performance between each round. No statistical or meaningful differences were observed in punching forces, pacing or RPE between conditions (P > 0.05; ≤ 2%). These null results could stem from the elite status of the athletes involved, the focus on performance rather than learning, or they may indicate that false feedback has a less potent effect on performance than previously thought.     

The effects of attentional focus instructions on punching velocity and impact forces among trained combat athletes

Research indicates that instructing athlete’s to focus on bodily movements (internal focus of attention [IFA]) may hinder performance, whereas instructing them to focus on the movement outcome (external focus of attention [EFA]) often enhances performance. Despite the importance of instructions in striking combat sports, limited research has examined the influence of IFA and EFA on performance in well-trained combat athletes. This study investigated the effects of different instructional cues on punching velocity (m · s^?1) and normalised impact forces (N · kg^?1) among intermediate (n = 8) and expert (n = 7) competitive boxers and kickboxers. Athletes completed three rounds of 12 maximal effort punches delivered to a punching integrator on three separate days. Day one was a familiarisation session with only control instructions provided. In the following two days athletes randomly received IFA, EFA or control instructions prior to each of the three rounds. Athletes punching with EFA were 4% faster and 5% more forceful than IFA (P < 0.05), and 2% faster and 3% more forceful than control (P < 0.05). Furthermore, experts punched 11% faster and with 13% greater force compared with intermediate athletes (P < 0.05). EFA led to a positive effect on punching performance and should be favoured over IFA and control instructions.     

赛艇可视化多功能智能测试训练系统的研制

本文研制了一种赛艇可视化训练测试系统。该系统采用液压作阻力源,以正确地模拟桨叶在水中划动时的阻力特性,利用微机进行采集以测试赛艇运动员技术动作的力学指标,利用图形软件来显示模拟赛艇在水中的运动情况,构成一整套赛艇模拟测试的可视化系统。通过该系统不仅可以进行赛艇运动员的身体力量训练,还可以从生物力学角度研究赛艇技术动作,以评价和完善运动员的技术动作,是一个能进行测试、比赛、训练、分析评估的智能化的赛艇可视化测试训练系统。     

多工位母线加工机液压系统分析

本文主要介绍了多工位母线加工机液压控制系统,并对其冲孔单元、剪切单元和折弯单元的使用方法进行了说明。     

优化设计在设备技术改造中的应用

本文研究了常用优化设计方法在新的水压机活动横梁中的应用,对活动横梁的结构参数进行了优化,保证设计方案达到最佳;并建立了活动横梁的有限元力学模型,对该结构进行了三维有限元强度分析。     

FluidSIM在高职液压传动课程改革中的应用

介绍了德国Festo公司液压传动教学仿真软件FluidSIM的功能。结合实例说明了FluidSIM软件在液压传动课程改革中的应用,营造了"教、学、做"一体化的教学环境,有利于激发学生的学习兴趣,提高学习效果。     

突出煤层掘进工作面槽硐突出能量分析

水力掏槽措施可在突出煤层中实现快速掘进,但在掏槽过程中仍然会存在突出的现象,尤其是在槽硐中会产生小的突出,为控制这一现象的发生,改善水力掏槽措施,从引起槽硐周围煤体突出的根源入手,运用宏观突出理论,分别从瓦斯内能、顶底板弹性潜能和煤体弹性潜能三个方面对槽硐突出能量进行深入分析。并结合黑龙江省矿区煤层、瓦斯赋存等实际情况,进行定量分析。对掘进工作面槽硐突出能量的研究可拓展水力掏槽措施防突机理,并提高水力掏槽措施在黑龙江省矿区的适应性。