以菱形负刚度机构HSLDS（high static low dynamic stiffness）隔振器（简称菱形HSLDS隔振器）为研究目标，采用虚功法建立负刚度机构等效摩擦力模型，并以拉格朗日方法建立包含负刚度机构质量及摩擦力因素的动力学方程；利用谐波平衡法（HBM）求解动力学方程，分析了负刚度机构质量及摩擦力对隔振的影响及其优化措施，并通过实物样机验证了理论模型的合理性。实验结果表明：负刚度机构质量及摩擦力对隔振均产生不利影响，应尽量减小；将负刚度机构连杆较短侧连接于载荷平台端，可以减小负刚度机构质量对较高频段隔振性能的影响；在限定隔振器刚度参数以及铰接副接触参数且同时满足刚度与摩擦力优化条件下，通过增大连杆机构杆长差的方式可以优化低频段隔振性能，并降低负刚度机构摩擦力对高频段隔振的影响。

针对光电载荷对隔振性能的需求，提出一种采用菱形连杆机构作为负刚度组件，具有高静、低动刚度特点的非线性隔振器（简称菱形HSLDS隔振器）。采用静力学分析方法，建立了隔振器数学模型，研究了刚度参数设定以及非线性调节方法；利用谐波平衡法（HBM）求解动力学方程，分析了各参数对隔振性能的影响关系；采用动力学仿真软件ADAMS及实物样机对理论模型与结论进行了验证。测试结果表明：菱形HSLDS隔振器具有较方便的参数调整能力，零位刚度及刚度非线性可通过拉簧参数与连杆参数进行设定、优化，隔振的刚度非线性优化程度受主隔振器阻尼以及零位刚度参数影响。相比于传统线性隔振器，菱形HSLDS具有显著的非线性隔振优势，可较好地满足光电载荷隔振需求。

提出了一种采用菱形连杆组件作为负刚度机构的准零刚度隔振器(下文简称菱形准零刚度隔振器).通过静力学分析方法,建立了菱形准零刚度隔振器数学模型,并与其他调节变量较少的隔振器模型进行了对比;以被测量曲线在隔振器平衡位置处的曲率作为评价参数,研究了负刚度机构几何参数对系统刚度、阻尼非线性的影响,推导了利用几何参数进行隔振优化的条件;采用谐波平衡法求解系统动力学方程,对隔振器在不同几何参数下的隔振性能进行了分析.结果表明:菱形准零刚度隔振器具有体积相对较小且非线性调节能力较好的特点,可通过调节杆长,或满足相关临界值条件时调节杆长偏差量(下文简称杆长差)对刚度及阻尼非线性特征进行优化;刚度与阻尼的非线性优化方向不同,但通常情况下,刚度非线性因素对隔振优化起主导作用;归一化振动相对位移小于0.1时,由刚度曲线曲率得到的临界值可以较好地作为杆长差参数的隔振优化调节依据.本文提出的非线性评价方法与几何非线性优化临界值计算方法,对于类似隔振器研究和设计具有一定的指导意义.

Servo unit and structural unit of stabilized sighting pods had a strong coupling relationship.In order to make the system obtain good servo characteristics,system resonance had to be suppressed.We got system resonance with generate frequency-sweep by a motor.And we given stabilized sighting pod analysis model based on the dual parallel mode simplified method of quality characteristics and load transfer path,and detailed designed and implemented modal testing plan.Finally,a double evaluation method based on the frequency range approximation and vibration visual match cam to quickly identify models was peoposed.The results between simulation and test had direct,quick closed-loop verification.And simulation-test link is that traditional designer could easy to learn,which meets strong engineering practicality.

The shape of optical lightweight thin reflector possessing large flakiness ratio is always effected by wide-range temperature and harsh environment(especially at-40℃),seriously influencing the system image quality.Aiming at this problem,based on flexible support principle and thermodynamics theory, a new support structure was designed for small lightweight thin splitting reflector.The temperature adaptability of the support structure was analyzed by using finite element method ,and the low temperature tests for assembled mirror components were conducted.The result shows that the accuracy of reflector surface figure remains 0.25λ(λ=632.8 nm, peak-to-valley)at-40℃.These results demonstrate that the novel flexible supporting structure design satisfies the application environment requirements.

As the input parameters more and not easy to measure accurately,it is difficult to get the high-precision simulation model of thermoelectric cooler.A method of model establishment and modification was proposed.At first,the thermal model of thermoelectric cooler was established.Then,the sensitivity of thermal model parameters is analyzed by the Spearman rank correlation.It is aimed to determine the strong correlation parameters and weak correlation parameters that affect the simulation accuracy.Taking the measured temperatures as the targets,the multi-island genetic algorithm was used to correct the strong correlation parameters firstly.Then the weak correlation parameters are corrected.Based on above results,the Hooke-Jeeves Direct Search Method was used to modify the parameters for obtaining the accurate values when the current is 3.6 A.Similarly,the corrected values are obtained when the current is varyed from 0 A to 3.9 A.The accurate thermal model of thermoelectric cooler can be established at different current.The results show that the maximum error between simulation value and experiment value is less than 4.9 ℃ (-5℃ to 100.5 ℃) when the current is changed from 0 A to 3.9 A.In conclusion,the modified method of thermal model is reasonable and accurate.

为提高热模型的仿真精度,提出了一种基于Isight/Fluent协同仿真的热模型修正方法.首先运用Spearman相关级数对热模型的输入参数进行灵敏度分析,确定影响仿真精度的主要参数;然后以修正对象的实测温度值为目标,采用多岛群遗传算法对参数进行修正,得到初步修正后的模型;最后以此模型为基础,运用霍克基维斯算法对其进行精确修正.通过发热电阻对该修正方法进行验证,结果显示,在5～15 V电压下,发热电阻的仿真值与实测值误差小于5.4％,说明通过该修正方法获得的热仿真模型具有较高的精度.